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<h1>nghttp2.h<a class="headerlink" href="#nghttp2-h" title="Permalink to this headline"></a></h1>
<div class="highlight-c"><div class="highlight"><pre><span class="cm">/*</span>
<span class="cm"> * nghttp2 - HTTP/2.0 C Library</span>
<span class="cm"> *</span>
<span class="cm"> * Copyright (c) 2013, 2014 Tatsuhiro Tsujikawa</span>
<span class="cm"> *</span>
<span class="cm"> * Permission is hereby granted, free of charge, to any person obtaining</span>
<span class="cm"> * a copy of this software and associated documentation files (the</span>
<span class="cm"> * &quot;Software&quot;), to deal in the Software without restriction, including</span>
<span class="cm"> * without limitation the rights to use, copy, modify, merge, publish,</span>
<span class="cm"> * distribute, sublicense, and/or sell copies of the Software, and to</span>
<span class="cm"> * permit persons to whom the Software is furnished to do so, subject to</span>
<span class="cm"> * the following conditions:</span>
<span class="cm"> *</span>
<span class="cm"> * The above copyright notice and this permission notice shall be</span>
<span class="cm"> * included in all copies or substantial portions of the Software.</span>
<span class="cm"> *</span>
<span class="cm"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span>
<span class="cm"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<span class="cm"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
<span class="cm"> * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE</span>
<span class="cm"> * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION</span>
<span class="cm"> * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
<span class="cm"> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
<span class="cm"> */</span>
<span class="cp">#ifndef NGHTTP2_H</span>
<span class="cp">#define NGHTTP2_H</span>
<span class="cp">#ifdef __cplusplus</span>
<span class="k">extern</span> <span class="s">&quot;C&quot;</span> <span class="p">{</span>
<span class="cp">#endif</span>
<span class="cp">#include &lt;stdlib.h&gt;</span>
<span class="cp">#include &lt;stdint.h&gt;</span>
<span class="cp">#include &lt;sys/types.h&gt;</span>
<span class="cp">#include &lt;nghttp2/nghttp2ver.h&gt;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The protocol version identification of this library supports.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_PROTO_VERSION_ID &quot;h2-10&quot;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The length of :macro:`NGHTTP2_PROTO_VERSION_ID`.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_PROTO_VERSION_ID_LEN 5</span>
<span class="k">struct</span> <span class="n">nghttp2_session</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * The primary structure to hold the resources needed for a HTTP/2.0</span>
<span class="cm"> * session. The details of this structure are intentionally hidden</span>
<span class="cm"> * from the public API.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="n">nghttp2_session</span> <span class="n">nghttp2_session</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The age of :type:`nghttp2_info`</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_VERSION_AGE 1</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * This struct is what `nghttp2_version()` returns. It holds</span>
<span class="cm"> * information about the particular nghttp2 version.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * Age of this struct. This instance of nghttp2 sets it to</span>
<span class="cm"> * :macro:`NGHTTP2_VERSION_AGE` but a future version may bump it and</span>
<span class="cm"> * add more struct fields at the bottom</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="n">age</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * the :macro:`NGHTTP2_VERSION_NUM` number (since age ==1)</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="n">version_num</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * points to the :macro:`NGHTTP2_VERSION` string (since age ==1)</span>
<span class="cm"> */</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">version_str</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * points to the :macro:`NGHTTP2_PROTO_VERSION_ID` string this</span>
<span class="cm"> * instance implements (since age ==1)</span>
<span class="cm"> */</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">proto_str</span><span class="p">;</span>
<span class="cm">/* -------- the above fields all exist when age == 1 */</span>
<span class="p">}</span> <span class="n">nghttp2_info</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The default priority value</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_PRI_DEFAULT (1 &lt;&lt; 30)</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The lowest priority value</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_PRI_LOWEST ((1U &lt;&lt; 31) - 1)</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The maximum window size</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_MAX_WINDOW_SIZE ((int32_t)((1U &lt;&lt; 31) - 1))</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The initial window size for stream level flow control.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_INITIAL_WINDOW_SIZE ((1 &lt;&lt; 16) - 1)</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The initial window size for connection level flow control.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE ((1 &lt;&lt; 16) - 1)</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The maximum header table size.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_MAX_HEADER_TABLE_SIZE (1 &lt;&lt; 16)</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The client connection header.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_CLIENT_CONNECTION_HEADER &quot;PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n&quot;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> *</span>
<span class="cm"> * The length of :macro:`NGHTTP2_CLIENT_CONNECTION_HEADER`.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_CLIENT_CONNECTION_HEADER_LEN 24</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> *</span>
<span class="cm"> * Error codes used in this library. The code range is [-999, -500],</span>
<span class="cm"> * inclusive. The following values are defined:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * Invalid argument passed.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_ARGUMENT</span> <span class="o">=</span> <span class="o">-</span><span class="mi">501</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The specified protocol version is not supported.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_UNSUPPORTED_VERSION</span> <span class="o">=</span> <span class="o">-</span><span class="mi">503</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Used as a return value from :type:`nghttp2_send_callback` and</span>
<span class="cm"> * :type:`nghttp2_recv_callback` to indicate that the operation</span>
<span class="cm"> * would block.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_WOULDBLOCK</span> <span class="o">=</span> <span class="o">-</span><span class="mi">504</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * General protocol error</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_PROTO</span> <span class="o">=</span> <span class="o">-</span><span class="mi">505</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The frame is invalid.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_FRAME</span> <span class="o">=</span> <span class="o">-</span><span class="mi">506</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The peer performed a shutdown on the connection.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_EOF</span> <span class="o">=</span> <span class="o">-</span><span class="mi">507</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Used as a return value from</span>
<span class="cm"> * :func:`nghttp2_data_source_read_callback` to indicate that data</span>
<span class="cm"> * transfer is postponed. See</span>
<span class="cm"> * :func:`nghttp2_data_source_read_callback` for details.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_DEFERRED</span> <span class="o">=</span> <span class="o">-</span><span class="mi">508</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Stream ID has reached the maximum value. Therefore no stream ID</span>
<span class="cm"> * is available.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">509</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The stream is already closed; or the stream ID is invalid.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_STREAM_CLOSED</span> <span class="o">=</span> <span class="o">-</span><span class="mi">510</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * RST_STREAM has been added to the outbound queue. The stream is in</span>
<span class="cm"> * closing state.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_STREAM_CLOSING</span> <span class="o">=</span> <span class="o">-</span><span class="mi">511</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The transmission is not allowed for this stream (e.g., a frame</span>
<span class="cm"> * with END_STREAM flag set has already sent).</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_STREAM_SHUT_WR</span> <span class="o">=</span> <span class="o">-</span><span class="mi">512</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The stream ID is invalid.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_STREAM_ID</span> <span class="o">=</span> <span class="o">-</span><span class="mi">513</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The state of the stream is not valid (e.g., DATA cannot be sent</span>
<span class="cm"> * to the stream if response HEADERS has not been sent).</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_STREAM_STATE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">514</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Another DATA frame has already been deferred.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_DEFERRED_DATA_EXIST</span> <span class="o">=</span> <span class="o">-</span><span class="mi">515</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Starting new stream is not allowed. (e.g., GOAWAY has been sent</span>
<span class="cm"> * and/or received.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_START_STREAM_NOT_ALLOWED</span> <span class="o">=</span> <span class="o">-</span><span class="mi">516</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * GOAWAY has already been sent.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_GOAWAY_ALREADY_SENT</span> <span class="o">=</span> <span class="o">-</span><span class="mi">517</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The received frame contains the invalid header block. (e.g.,</span>
<span class="cm"> * There are duplicate header names; or the header names are not</span>
<span class="cm"> * encoded in US-ASCII character set and not lower cased; or the</span>
<span class="cm"> * header name is zero-length string; or the header value contains</span>
<span class="cm"> * multiple in-sequence NUL bytes).</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_HEADER_BLOCK</span> <span class="o">=</span> <span class="o">-</span><span class="mi">518</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Indicates that the context is not suitable to perform the</span>
<span class="cm"> * requested operation.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INVALID_STATE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">519</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The gzip error.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_GZIP</span> <span class="o">=</span> <span class="o">-</span><span class="mi">520</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The user callback function failed due to the temporal error.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">521</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the frame is invalid, either too large or too small.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_FRAME_SIZE_ERROR</span> <span class="o">=</span> <span class="o">-</span><span class="mi">522</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Header block inflate/deflate error.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_HEADER_COMP</span> <span class="o">=</span> <span class="o">-</span><span class="mi">523</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Flow control error</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_FLOW_CONTROL</span> <span class="o">=</span> <span class="o">-</span><span class="mi">524</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Insufficient buffer size given to function.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_INSUFF_BUFSIZE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">525</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Callback was paused by the application</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_PAUSE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">526</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * There are too many in-flight SETTING frame and no more</span>
<span class="cm"> * transmission of SETTINGS is allowed.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_TOO_MANY_INFLIGHT_SETTINGS</span> <span class="o">=</span> <span class="o">-</span><span class="mi">527</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The server push is disabled.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_PUSH_DISABLED</span> <span class="o">=</span> <span class="o">-</span><span class="mi">528</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The errors &lt; :enum:`NGHTTP2_ERR_FATAL` mean that the library is</span>
<span class="cm"> * under unexpected condition and cannot process any further data</span>
<span class="cm"> * reliably (e.g., out of memory).</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_FATAL</span> <span class="o">=</span> <span class="o">-</span><span class="mi">900</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Out of memory. This is a fatal error.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_NOMEM</span> <span class="o">=</span> <span class="o">-</span><span class="mi">901</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The user callback function failed. This is a fatal error.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ERR_CALLBACK_FAILURE</span> <span class="o">=</span> <span class="o">-</span><span class="mi">902</span>
<span class="p">}</span> <span class="n">nghttp2_error</span><span class="p">;</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="n">NGHTTP2_MSG_MORE</span>
<span class="p">}</span> <span class="n">nghttp2_io_flag</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * The name/value pair, which mainly used to represent header fields.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The |name| byte string, which is not necessarily ``NULL``</span>
<span class="cm"> * terminated.</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">name</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The |value| byte string, which is not necessarily ``NULL``</span>
<span class="cm"> * terminated.</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the |name|.</span>
<span class="cm"> */</span>
<span class="kt">uint16_t</span> <span class="n">namelen</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the |value|.</span>
<span class="cm"> */</span>
<span class="kt">uint16_t</span> <span class="n">valuelen</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_nv</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> * The control frame types in HTTP/2.0.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The DATA frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_DATA</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_HEADERS</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PRIORITY frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_PRIORITY</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The RST_STREAM frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_RST_STREAM</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The SETTINGS frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS</span> <span class="o">=</span> <span class="mi">4</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PUSH_PROMISE frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_PUSH_PROMISE</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PING frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_PING</span> <span class="o">=</span> <span class="mi">6</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The GOAWAY frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_GOAWAY</span> <span class="o">=</span> <span class="mi">7</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The WINDOW_UPDATE frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_WINDOW_UPDATE</span> <span class="o">=</span> <span class="mi">8</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The CONTINUATION frame.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_CONTINUATION</span> <span class="o">=</span> <span class="mi">9</span>
<span class="p">}</span> <span class="n">nghttp2_frame_type</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> *</span>
<span class="cm"> * The flags for HTTP/2.0 frames. This enum defines all flags for</span>
<span class="cm"> * frames, assuming that the same flag name has the same mask.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * No flag set.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_NONE</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The END_STREAM flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_END_STREAM</span> <span class="o">=</span> <span class="mh">0x1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The END_HEADERS flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_END_HEADERS</span> <span class="o">=</span> <span class="mh">0x4</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PRIORITY flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_PRIORITY</span> <span class="o">=</span> <span class="mh">0x8</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The ACK flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_ACK</span> <span class="o">=</span> <span class="mh">0x1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The END_SEGMENT flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_END_SEGMENT</span> <span class="o">=</span> <span class="mh">0x2</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PAD_LOW flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_PAD_LOW</span> <span class="o">=</span> <span class="mh">0x10</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The PAD_HIGH flag.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLAG_PAD_HIGH</span> <span class="o">=</span> <span class="mh">0x20</span>
<span class="p">}</span> <span class="n">nghttp2_flag</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> * The SETTINGS ID.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * SETTINGS_HEADER_TABLE_SIZE</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_HEADER_TABLE_SIZE</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * SETTINGS_ENABLE_PUSH</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_ENABLE_PUSH</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * SETTINGS_MAX_CONCURRENT_STREAMS</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * SETTINGS_INITIAL_WINDOW_SIZE</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE</span> <span class="o">=</span> <span class="mi">4</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * Maximum ID of :type:`nghttp2_settings_id`.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_MAX</span> <span class="o">=</span> <span class="mi">4</span>
<span class="p">}</span> <span class="n">nghttp2_settings_id</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @macro</span>
<span class="cm"> * Default maximum concurrent streams.</span>
<span class="cm"> */</span>
<span class="cp">#define NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS ((1U &lt;&lt; 31) - 1)</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> * The status codes for the RST_STREAM and GOAWAY frames.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * No errors.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_NO_ERROR</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * PROTOCOL_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_PROTOCOL_ERROR</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * INTERNAL_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_INTERNAL_ERROR</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * FLOW_CONTROL_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FLOW_CONTROL_ERROR</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * SETTINGS_TIMEOUT</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_SETTINGS_TIMEOUT</span> <span class="o">=</span> <span class="mi">4</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * STREAM_CLOSED</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_STREAM_CLOSED</span> <span class="o">=</span> <span class="mi">5</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * FRAME_SIZE_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_FRAME_SIZE_ERROR</span> <span class="o">=</span> <span class="mi">6</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * REFUSED_STREAM</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_REFUSED_STREAM</span> <span class="o">=</span> <span class="mi">7</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * CANCEL</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_CANCEL</span> <span class="o">=</span> <span class="mi">8</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * COMPRESSION_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_COMPRESSION_ERROR</span> <span class="o">=</span> <span class="mi">9</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * CONNECT_ERROR</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_CONNECT_ERROR</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * ENHANCE_YOUR_CALM</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_ENHANCE_YOUR_CALM</span> <span class="o">=</span> <span class="mi">11</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * INADEQUATE_SECURITY</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_INADEQUATE_SECURITY</span> <span class="o">=</span> <span class="mi">12</span>
<span class="p">}</span> <span class="n">nghttp2_error_code</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The length field of this frame, excluding frame header.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">length</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The stream identifier (aka, stream ID)</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The type of this frame. See `nghttp2_frame`.</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="n">type</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The flags.</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_frame_hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @union</span>
<span class="cm"> *</span>
<span class="cm"> * This union represents the some kind of data source passed to</span>
<span class="cm"> * :type:`nghttp2_data_source_read_callback`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">union</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The integer field, suitable for a file descriptor.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="n">fd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The pointer to an arbitrary object.</span>
<span class="cm"> */</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_data_source</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when the library wants to read data from</span>
<span class="cm"> * the |source|. The read data is sent in the stream |stream_id|. The</span>
<span class="cm"> * implementation of this function must read at most |length| bytes of</span>
<span class="cm"> * data from |source| (or possibly other places) and store them in</span>
<span class="cm"> * |buf| and return number of data stored in |buf|. If EOF is reached,</span>
<span class="cm"> * set |*eof| to 1. If the application wants to postpone DATA frames,</span>
<span class="cm"> * (e.g., asynchronous I/O, or reading data blocks for long time), it</span>
<span class="cm"> * is achieved by returning :enum:`NGHTTP2_ERR_DEFERRED` without</span>
<span class="cm"> * reading any data in this invocation. The library removes DATA</span>
<span class="cm"> * frame from the outgoing queue temporarily. To move back deferred</span>
<span class="cm"> * DATA frame to outgoing queue, call `nghttp2_session_resume_data()`.</span>
<span class="cm"> * In case of error, there are 2 choices. Returning</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will close the stream</span>
<span class="cm"> * by issuing RST_STREAM with :enum:`NGHTTP2_INTERNAL_ERROR`.</span>
<span class="cm"> * Returning :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` will signal the</span>
<span class="cm"> * entire session failure.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">ssize_t</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_data_source_read_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">int</span> <span class="o">*</span><span class="n">eof</span><span class="p">,</span>
<span class="n">nghttp2_data_source</span> <span class="o">*</span><span class="n">source</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * This struct represents the data source and the way to read a chunk</span>
<span class="cm"> * of data from it.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The data source.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_data_source</span> <span class="n">source</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The callback function to read a chunk of data from the |source|.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_data_source_read_callback</span> <span class="n">read_callback</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_data_provider</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * The DATA frame. The received data is delivered via</span>
<span class="cm"> * :type:`nghttp2_on_data_chunk_recv_callback`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the padding in this frame. This includes PAD_HIGH</span>
<span class="cm"> * and PAD_LOW.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">padlen</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_data</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> *</span>
<span class="cm"> * The category of HEADERS, which indicates the role of the frame. In</span>
<span class="cm"> * HTTP/2.0 spec, request, response, push response and other arbitrary</span>
<span class="cm"> * headers (e.g., trailers) are all called just HEADERS. To give the</span>
<span class="cm"> * application the role of incoming HEADERS frame, we define several</span>
<span class="cm"> * categories.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame is opening new stream, which is analogous to</span>
<span class="cm"> * SYN_STREAM in SPDY.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_HCAT_REQUEST</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame is the first response headers, which is</span>
<span class="cm"> * analogous to SYN_REPLY in SPDY.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_HCAT_RESPONSE</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame is the first headers sent against reserved</span>
<span class="cm"> * stream.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_HCAT_PUSH_RESPONSE</span> <span class="o">=</span> <span class="mi">2</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame which does not apply for the above categories,</span>
<span class="cm"> * which is analogous to HEADERS in SPDY.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_HCAT_HEADERS</span> <span class="o">=</span> <span class="mi">3</span>
<span class="p">}</span> <span class="n">nghttp2_headers_category</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The HEADERS frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the padding in this frame. This includes PAD_HIGH</span>
<span class="cm"> * and PAD_LOW.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">padlen</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The name/value pairs.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The number of name/value pairs in |nva|.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The category of this HEADERS frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_headers_category</span> <span class="n">cat</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The priority.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">pri</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_headers</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The PRIORITY frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The priority.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">pri</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_priority</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The RST_STREAM frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The error code. See :type:`nghttp2_error_code`.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_rst_stream</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The SETTINGS ID/Value pair. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The SETTINGS ID. See :type:`nghttp2_settings_id`.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">settings_id</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The value of this entry.</span>
<span class="cm"> */</span>
<span class="kt">uint32_t</span> <span class="n">value</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_settings_entry</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The SETTINGS frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The number of SETTINGS ID/Value pairs in |iv|.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">niv</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The pointer to the array of SETTINGS ID/Value pair.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_settings_entry</span> <span class="o">*</span><span class="n">iv</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_settings</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The PUSH_PROMISE frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of the padding in this frame. This includes PAD_HIGH</span>
<span class="cm"> * and PAD_LOW.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">padlen</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The name/value pairs.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The number of name/value pairs in |nva|.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The promised stream ID</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">promised_stream_id</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_push_promise</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The PING frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The opaque data</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="n">opaque_data</span><span class="p">[</span><span class="mi">8</span><span class="p">];</span>
<span class="p">}</span> <span class="n">nghttp2_ping</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> * The GOAWAY frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The last stream stream ID.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">last_stream_id</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The error code. See :type:`nghttp2_error_code`.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The additional debug data</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">opaque_data</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The length of |opaque_data| member.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="n">opaque_data_len</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_goaway</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * The WINDOW_UPDATE frame. It has the following members:</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The window size increment.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="n">window_size_increment</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_window_update</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @union</span>
<span class="cm"> *</span>
<span class="cm"> * This union includes all frames to pass them to various function</span>
<span class="cm"> * calls as nghttp2_frame type. The CONTINUATION frame is omitted from</span>
<span class="cm"> * here because the library deals with it internally.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">union</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * The frame header, which is convenient to inspect frame header.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_frame_hd</span> <span class="n">hd</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The DATA frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_data</span> <span class="n">data</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The HEADERS frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_headers</span> <span class="n">headers</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The PRIORITY frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_priority</span> <span class="n">priority</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The RST_STREAM frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_rst_stream</span> <span class="n">rst_stream</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The SETTINGS frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_settings</span> <span class="n">settings</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The PUSH_PROMISE frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_push_promise</span> <span class="n">push_promise</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The PING frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_ping</span> <span class="n">ping</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The GOAWAY frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_goaway</span> <span class="n">goaway</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The WINDOW_UPDATE frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_window_update</span> <span class="n">window_update</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_frame</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when |session| wants to send data to the</span>
<span class="cm"> * remote peer. The implementation of this function must send at most</span>
<span class="cm"> * |length| bytes of data stored in |data|. The |flags| is currently</span>
<span class="cm"> * not used and always 0. It must return the number of bytes sent if</span>
<span class="cm"> * it succeeds. If it cannot send any single byte without blocking,</span>
<span class="cm"> * it must return :enum:`NGHTTP2_ERR_WOULDBLOCK`. For other errors, it</span>
<span class="cm"> * must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. The |user_data|</span>
<span class="cm"> * pointer is the third argument passed in to the call to</span>
<span class="cm"> * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * This callback is required if the application uses</span>
<span class="cm"> * `nghttp2_session_send()` to send data to the remote endpoint. If</span>
<span class="cm"> * the application uses `nghttp2_session_mem_send()` instead, this</span>
<span class="cm"> * callback function is unnecessary.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">ssize_t</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_send_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when |session| wants to receive data from</span>
<span class="cm"> * the remote peer. The implementation of this function must read at</span>
<span class="cm"> * most |length| bytes of data and store it in |buf|. The |flags| is</span>
<span class="cm"> * currently not used and always 0. It must return the number of bytes</span>
<span class="cm"> * written in |buf| if it succeeds. If it cannot read any single byte</span>
<span class="cm"> * without blocking, it must return :enum:`NGHTTP2_ERR_WOULDBLOCK`. If</span>
<span class="cm"> * it gets EOF before it reads any single byte, it must return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_EOF`. For other errors, it must return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. Returning 0 is treated as</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_WOULDBLOCK`. The |user_data| pointer is the</span>
<span class="cm"> * third argument passed in to the call to</span>
<span class="cm"> * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * This callback is required if the application uses</span>
<span class="cm"> * `nghttp2_session_recv()` to receive data from the remote</span>
<span class="cm"> * endpoint. If the application uses `nghttp2_session_mem_recv()`</span>
<span class="cm"> * instead, this callback function is unnecessary.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">ssize_t</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_recv_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked by `nghttp2_session_recv()` when a aframe</span>
<span class="cm"> * is received. The |user_data| pointer is the third argument passed</span>
<span class="cm"> * in to the call to `nghttp2_session_client_new()` or</span>
<span class="cm"> * `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen``</span>
<span class="cm"> * member of their data structure are always ``NULL`` and 0</span>
<span class="cm"> * respectively. The header name/value pairs are emitted via</span>
<span class="cm"> * :type:`nghttp2_on_header_callback`.</span>
<span class="cm"> *</span>
<span class="cm"> * For HEADERS, PUSH_PROMISE and DATA frames, this callback may be</span>
<span class="cm"> * called after stream is closed (see</span>
<span class="cm"> * :type:`nghttp2_on_stream_close_callback`). The application should</span>
<span class="cm"> * check that stream is still alive using its own stream management or</span>
<span class="cm"> * :func:`nghttp2_session_get_stream_user_data()`.</span>
<span class="cm"> *</span>
<span class="cm"> * Only HEADERS and DATA frame can signal the end of incoming data. If</span>
<span class="cm"> * ``frame-&gt;hd.flags &amp; NGHTTP2_FLAG_END_STREAM`` is nonzero, the</span>
<span class="cm"> * |frame| is the last frame from the remote peer in this stream.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero value is returned, it is treated as fatal</span>
<span class="cm"> * error and `nghttp2_session_recv()` and `nghttp2_session_mem_recv()`</span>
<span class="cm"> * functions immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_frame_recv_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked by `nghttp2_session_recv()` when an</span>
<span class="cm"> * invalid non-DATA frame is received. The |error_code| is one of the</span>
<span class="cm"> * :enum:`nghttp2_error_code` and indicates the error. When this</span>
<span class="cm"> * callback function is invoked, the library automatically submits</span>
<span class="cm"> * either RST_STREAM or GOAWAY frame. The |user_data| pointer is the</span>
<span class="cm"> * third argument passed in to the call to</span>
<span class="cm"> * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * If frame is HEADERS or PUSH_PROMISE, the ``nva`` and ``nvlen``</span>
<span class="cm"> * member of their data structure are always ``NULL`` and 0</span>
<span class="cm"> * respectively.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_invalid_frame_recv_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when a chunk of data in DATA frame is</span>
<span class="cm"> * received. The |stream_id| is the stream ID this DATA frame belongs</span>
<span class="cm"> * to. The |flags| is the flags of DATA frame which this data chunk is</span>
<span class="cm"> * contained. ``(flags &amp; NGHTTP2_FLAG_END_STREAM) != 0`` does not</span>
<span class="cm"> * necessarily mean this chunk of data is the last one in the</span>
<span class="cm"> * stream. You should use :type:`nghttp2_on_frame_recv_callback` to</span>
<span class="cm"> * know all data frames are received. The |user_data| pointer is the</span>
<span class="cm"> * third argument passed in to the call to</span>
<span class="cm"> * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * If the application uses `nghttp2_session_mem_recv()`, it can return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_PAUSE` to make `nghttp2_session_mem_recv()`</span>
<span class="cm"> * return without processing further input bytes. The memory by</span>
<span class="cm"> * pointed by the |data| is retained until</span>
<span class="cm"> * `nghttp2_session_mem_recv()` or `nghttp2_session_recv()` is</span>
<span class="cm"> * called. The application must retain the input bytes which was used</span>
<span class="cm"> * to produce the |data| parameter, because it may refer to the memory</span>
<span class="cm"> * region included in the input bytes.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_mem_recv()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_data_chunk_recv_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked before the non-DATA frame |frame| is</span>
<span class="cm"> * sent. This may be useful, for example, to know the stream ID of</span>
<span class="cm"> * HEADERS and PUSH_PROMISE frame (see also</span>
<span class="cm"> * `nghttp2_session_get_stream_user_data()`), which is not assigned</span>
<span class="cm"> * when it was queued. The |user_data| pointer is the third argument</span>
<span class="cm"> * passed in to the call to `nghttp2_session_client_new()` or</span>
<span class="cm"> * `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_before_frame_send_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked after the frame |frame| is sent. The</span>
<span class="cm"> * |user_data| pointer is the third argument passed in to the call to</span>
<span class="cm"> * `nghttp2_session_client_new()` or `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_frame_send_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked after the non-DATA frame |frame| is not</span>
<span class="cm"> * sent because of the error. The error is indicated by the</span>
<span class="cm"> * |lib_error_code|, which is one of the values defined in</span>
<span class="cm"> * :type:`nghttp2_error`. The |user_data| pointer is the third</span>
<span class="cm"> * argument passed in to the call to `nghttp2_session_client_new()` or</span>
<span class="cm"> * `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_frame_not_send_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">int</span> <span class="n">lib_error_code</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when the stream |stream_id| is</span>
<span class="cm"> * closed. The reason of closure is indicated by the |error_code|. The</span>
<span class="cm"> * stream_user_data, which was specified in `nghttp2_submit_request()`</span>
<span class="cm"> * or `nghttp2_submit_headers()`, is still available in this</span>
<span class="cm"> * function. The |user_data| pointer is the third argument passed in</span>
<span class="cm"> * to the call to `nghttp2_session_client_new()` or</span>
<span class="cm"> * `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_stream_close_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span> <span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when the received frame type is</span>
<span class="cm"> * unknown. The |head| is the pointer to the header of the received</span>
<span class="cm"> * frame. The |headlen| is the length of the |head|. According to the</span>
<span class="cm"> * spec, the |headlen| is always 8. In other words, the |head| is the</span>
<span class="cm"> * first 8 bytes of the received frame. The |payload| is the pointer</span>
<span class="cm"> * to the data portion of the received frame. The |payloadlen| is the</span>
<span class="cm"> * length of the |payload|. This is the data after the length</span>
<span class="cm"> * field. The |user_data| pointer is the third argument passed in to</span>
<span class="cm"> * the call to `nghttp2_session_client_new()` or</span>
<span class="cm"> * `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. If nonzero is returned, it is treated as fatal error and</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_send()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_unknown_frame_recv_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">head</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">headlen</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">payload</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">payloadlen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when the reception of header block in</span>
<span class="cm"> * HEADERS or PUSH_PROMISE is started. Each header name/value pair</span>
<span class="cm"> * will be emitted by :type:`nghttp2_on_header_callback`.</span>
<span class="cm"> *</span>
<span class="cm"> * The ``frame-&gt;hd.flags`` may not have</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_END_HEADERS` flag set, which indicates that one</span>
<span class="cm"> * or more CONTINUATION frames are involved. But the application does</span>
<span class="cm"> * not need to care about that because the header name/value pairs are</span>
<span class="cm"> * emitted transparently regardless of CONTINUATION frames.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it succeeds or</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If nonzero value other than</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned, it is treated as</span>
<span class="cm"> * if :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned. If</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned,</span>
<span class="cm"> * `nghttp2_session_mem_recv()` function will immediately return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_begin_headers_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when a header name/value pair is received</span>
<span class="cm"> * for the |frame|. When this callback is invoked, ``frame-&gt;hd.type``</span>
<span class="cm"> * is either :enum:`NGHTTP2_HEADERS` or :enum:`NGHTTP2_PUSH_PROMISE`.</span>
<span class="cm"> * After all header name/value pairs are processed with this callback,</span>
<span class="cm"> * and no error has been detected,</span>
<span class="cm"> * :type:`nghttp2_on_frame_recv_callback` will be invoked. If there</span>
<span class="cm"> * is an error in decompression,</span>
<span class="cm"> * :type:`nghttp2_on_frame_recv_callback` for the |frame| will not be</span>
<span class="cm"> * invoked.</span>
<span class="cm"> *</span>
<span class="cm"> * The |name| may be ``NULL`` if the |namelen| is 0. The same thing</span>
<span class="cm"> * can be said about the |value|.</span>
<span class="cm"> *</span>
<span class="cm"> * Please note that nghttp2 library does not perform any validity</span>
<span class="cm"> * check against the |name| and the |value|. For example, the</span>
<span class="cm"> * |namelen| could be 0, and/or the |value| contains ``0x0a`` or</span>
<span class="cm"> * ``0x0d``. The application must check them if it matters. The</span>
<span class="cm"> * helper function `nghttp2_check_header_name()` and</span>
<span class="cm"> * `nghttp2_check_header_value()` provide simple validation against</span>
<span class="cm"> * HTTP2 header field construction rule.</span>
<span class="cm"> *</span>
<span class="cm"> * One more thing to note is that the |value| may contain ``NULL``</span>
<span class="cm"> * (``0x00``) characters. It is used to concatenate header values</span>
<span class="cm"> * which share the same header field name. The application should</span>
<span class="cm"> * split these values if it wants to get individual value. This</span>
<span class="cm"> * concatenation is used in order to keep the ordering of headers.</span>
<span class="cm"> *</span>
<span class="cm"> * If the application uses `nghttp2_session_mem_recv()`, it can return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_PAUSE` to make `nghttp2_session_mem_recv()`</span>
<span class="cm"> * return without processing further input bytes. The memory pointed</span>
<span class="cm"> * by |frame|, |name| and |value| parameters are retained until</span>
<span class="cm"> * `nghttp2_session_mem_recv()` or `nghttp2_session_recv()` is</span>
<span class="cm"> * called. The application must retain the input bytes which was used</span>
<span class="cm"> * to produce these parameters, because it may refer to the memory</span>
<span class="cm"> * region included in the input bytes.</span>
<span class="cm"> *</span>
<span class="cm"> * Returning :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE` will close</span>
<span class="cm"> * the stream by issuing RST_STREAM with</span>
<span class="cm"> * :enum:`NGHTTP2_INTERNAL_ERROR`. In this case,</span>
<span class="cm"> * :type:`nghttp2_on_frame_recv_callback` will not be invoked.</span>
<span class="cm"> *</span>
<span class="cm"> * The implementation of this function must return 0 if it</span>
<span class="cm"> * succeeds. It may return :enum:`NGHTTP2_ERR_PAUSE` or</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE`. For other critical</span>
<span class="cm"> * failures, it must return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If</span>
<span class="cm"> * the other nonzero value is returned, it is treated as</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. If</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` is returned,</span>
<span class="cm"> * `nghttp2_session_recv()` and `nghttp2_session_mem_recv()` functions</span>
<span class="cm"> * immediately return :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_on_header_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">namelen</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">valuelen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @functypedef</span>
<span class="cm"> *</span>
<span class="cm"> * Callback function invoked when the library asks application how</span>
<span class="cm"> * much padding is required for the transmission of the |frame|. The</span>
<span class="cm"> * application must choose the total length of payload including</span>
<span class="cm"> * padded bytes in range [frame-&gt;hd.length, max_payloadlen],</span>
<span class="cm"> * inclusive. Choosing number not in this range will be treated as</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`. Returning</span>
<span class="cm"> * ``frame-&gt;hd.length`` means no padding is added. Returning</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE` will make</span>
<span class="cm"> * `nghttp2_session_send()` function immediately return</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="nf">ssize_t</span> <span class="p">(</span><span class="o">*</span><span class="n">nghttp2_select_padding_callback</span><span class="p">)</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">max_payloadlen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * Callback functions.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the |session| wants to send data</span>
<span class="cm"> * to the remote peer. This callback is not necessary if the</span>
<span class="cm"> * application uses `nghttp2_session_mem_send()` to serialize data</span>
<span class="cm"> * to transmit.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_send_callback</span> <span class="n">send_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the |session| wants to receive</span>
<span class="cm"> * data from the remote peer. This callback is not necessary if the</span>
<span class="cm"> * application uses `nghttp2_session_mem_recv()` to process received</span>
<span class="cm"> * data.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_recv_callback</span> <span class="n">recv_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked by `nghttp2_session_recv()` when a</span>
<span class="cm"> * frame is received.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_frame_recv_callback</span> <span class="n">on_frame_recv_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked by `nghttp2_session_recv()` when an</span>
<span class="cm"> * invalid non-DATA frame is received.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_invalid_frame_recv_callback</span> <span class="n">on_invalid_frame_recv_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when a chunk of data in DATA frame is</span>
<span class="cm"> * received.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_data_chunk_recv_callback</span> <span class="n">on_data_chunk_recv_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked before a non-DATA frame is sent.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_before_frame_send_callback</span> <span class="n">before_frame_send_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked after a frame is sent.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_frame_send_callback</span> <span class="n">on_frame_send_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * The callback function invoked when a non-DATA frame is not sent</span>
<span class="cm"> * because of an error.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_frame_not_send_callback</span> <span class="n">on_frame_not_send_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the stream is closed.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_stream_close_callback</span> <span class="n">on_stream_close_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the received frame type is</span>
<span class="cm"> * unknown.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_unknown_frame_recv_callback</span> <span class="n">on_unknown_frame_recv_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the reception of header block in</span>
<span class="cm"> * HEADERS or PUSH_PROMISE is started.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_begin_headers_callback</span> <span class="n">on_begin_headers_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when a header name/value pair is</span>
<span class="cm"> * received.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_on_header_callback</span> <span class="n">on_header_callback</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * Callback function invoked when the library asks application how</span>
<span class="cm"> * much padding is required for the transmission of the given frame.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_select_padding_callback</span> <span class="n">select_padding_callback</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_session_callbacks</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Initializes |*session_ptr| for client use. The all members of</span>
<span class="cm"> * |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr|</span>
<span class="cm"> * does not store |callbacks|. |user_data| is an arbitrary user</span>
<span class="cm"> * supplied data, which will be passed to the callback functions.</span>
<span class="cm"> *</span>
<span class="cm"> * The :member:`nghttp2_session_callbacks.send_callback` must be</span>
<span class="cm"> * specified. If the application code uses `nghttp2_session_recv()`,</span>
<span class="cm"> * the :member:`nghttp2_session_callbacks.recv_callback` must be</span>
<span class="cm"> * specified. The other members of |callbacks| can be ``NULL``.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_client_new</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">**</span><span class="n">session_ptr</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Initializes |*session_ptr| for server use. The all members of</span>
<span class="cm"> * |callbacks| are copied to |*session_ptr|. Therefore |*session_ptr|</span>
<span class="cm"> * does not store |callbacks|. |user_data| is an arbitrary user</span>
<span class="cm"> * supplied data, which will be passed to the callback functions.</span>
<span class="cm"> *</span>
<span class="cm"> * The :member:`nghttp2_session_callbacks.send_callback` must be</span>
<span class="cm"> * specified. If the application code uses `nghttp2_session_recv()`,</span>
<span class="cm"> * the :member:`nghttp2_session_callbacks.recv_callback` must be</span>
<span class="cm"> * specified. The other members of |callbacks| can be ``NULL``.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_server_new</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">**</span><span class="n">session_ptr</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @enum</span>
<span class="cm"> *</span>
<span class="cm"> * Configuration options for :type:`nghttp2_session`.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">enum</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * This option prevents the library from sending WINDOW_UPDATE for a</span>
<span class="cm"> * stream automatically. If this option is set to nonzero, the</span>
<span class="cm"> * library won&#39;t send WINDOW_UPDATE for a stream and the application</span>
<span class="cm"> * is responsible for sending WINDOW_UPDATE using</span>
<span class="cm"> * `nghttp2_submit_window_update`. By default, this option is set to</span>
<span class="cm"> * zero.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_OPT_NO_AUTO_STREAM_WINDOW_UPDATE</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * This option prevents the library from sending WINDOW_UPDATE for a</span>
<span class="cm"> * connection automatically. If this option is set to nonzero, the</span>
<span class="cm"> * library won&#39;t send WINDOW_UPDATE for a connection and the</span>
<span class="cm"> * application is responsible for sending WINDOW_UPDATE with stream</span>
<span class="cm"> * ID 0 using `nghttp2_submit_window_update`. By default, this</span>
<span class="cm"> * option is set to zero.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE</span> <span class="o">=</span> <span class="mi">1</span> <span class="o">&lt;&lt;</span> <span class="mi">1</span><span class="p">,</span>
<span class="cm">/**</span>
<span class="cm"> * This option sets the SETTINGS_MAX_CONCURRENT_STREAMS value of</span>
<span class="cm"> * remote endpoint as if it is received in SETTINGS frame. Without</span>
<span class="cm"> * specifying this option, before the local endpoint receives</span>
<span class="cm"> * SETTINGS_MAX_CONCURRENT_STREAMS in SETTINGS frame from remote</span>
<span class="cm"> * endpoint, SETTINGS_MAX_CONCURRENT_STREAMS is unlimited. This may</span>
<span class="cm"> * cause problem if local endpoint submits lots of requests</span>
<span class="cm"> * initially and sending them at once to the remote peer may lead to</span>
<span class="cm"> * the rejection of some requests. Specifying this option to the</span>
<span class="cm"> * sensible value, say 100, may avoid this kind of issue. This value</span>
<span class="cm"> * will be overwritten if the local endpoint receives</span>
<span class="cm"> * SETTINGS_MAX_CONCURRENT_STREAMS from the remote endpoint.</span>
<span class="cm"> */</span>
<span class="n">NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS</span> <span class="o">=</span> <span class="mi">1</span> <span class="o">&lt;&lt;</span> <span class="mi">2</span>
<span class="p">}</span> <span class="n">nghttp2_opt</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * Struct to store option values for nghttp2_session.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span>
<span class="cm">/**</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS`</span>
<span class="cm"> */</span>
<span class="kt">uint32_t</span> <span class="n">peer_max_concurrent_streams</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_NO_AUTO_STREAM_WINDOW_UPDATE`</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="n">no_auto_stream_window_update</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE`</span>
<span class="cm"> */</span>
<span class="kt">uint8_t</span> <span class="n">no_auto_connection_window_update</span><span class="p">;</span>
<span class="p">}</span> <span class="n">nghttp2_opt_set</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Like `nghttp2_session_client_new()`, but with additional options</span>
<span class="cm"> * specified in the |opt_set|. The caller must set bitwise-OR of</span>
<span class="cm"> * :enum:`nghttp2_opt` for given options. For example, if it</span>
<span class="cm"> * specifies :enum:`NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE` and</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS` in the |opt_set|,</span>
<span class="cm"> * the |opt_set_mask| should be</span>
<span class="cm"> * ``NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE |</span>
<span class="cm"> * NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS``.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |opt_set_mask| is 0, the |opt_set| could be ``NULL`` safely</span>
<span class="cm"> * and the call is equivalent to `nghttp2_session_client_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_client_new2</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">**</span><span class="n">session_ptr</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">,</span>
<span class="kt">uint32_t</span> <span class="n">opt_set_mask</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_opt_set</span> <span class="o">*</span><span class="n">opt_set</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Like `nghttp2_session_server_new()`, but with additional options</span>
<span class="cm"> * specified in the |opt_set|. The caller must set bitwise-OR of</span>
<span class="cm"> * :enum:`nghttp2_opt` for given options. For example, if it</span>
<span class="cm"> * specifies :enum:`NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE` and</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS` in the |opt_set|,</span>
<span class="cm"> * the |opt_set_mask| should be</span>
<span class="cm"> * ``NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE |</span>
<span class="cm"> * NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS``.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |opt_set_mask| is 0, the |opt_set| could be ``NULL`` safely</span>
<span class="cm"> * and the call is equivalent to `nghttp2_session_server_new()`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_server_new2</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">**</span><span class="n">session_ptr</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">,</span>
<span class="kt">uint32_t</span> <span class="n">opt_set_mask</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_opt_set</span> <span class="o">*</span><span class="n">opt_set</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Frees any resources allocated for |session|. If |session| is</span>
<span class="cm"> * ``NULL``, this function does nothing.</span>
<span class="cm"> */</span>
<span class="kt">void</span> <span class="nf">nghttp2_session_del</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Sends pending frames to the remote peer.</span>
<span class="cm"> *</span>
<span class="cm"> * This function retrieves the highest prioritized frame from the</span>
<span class="cm"> * outbound queue and sends it to the remote peer. It does this as</span>
<span class="cm"> * many as possible until the user callback</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.send_callback` returns</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_WOULDBLOCK` or the outbound queue becomes empty.</span>
<span class="cm"> * This function calls several callback functions which are passed</span>
<span class="cm"> * when initializing the |session|. Here is the simple time chart</span>
<span class="cm"> * which tells when each callback is invoked:</span>
<span class="cm"> *</span>
<span class="cm"> * 1. Get the next frame to send from outbound queue.</span>
<span class="cm"> * 2. Prepare transmission of the frame.</span>
<span class="cm"> * 3. If the control frame cannot be sent because some preconditions</span>
<span class="cm"> * are not met (e.g., request HEADERS cannot be sent after</span>
<span class="cm"> * GOAWAY),</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_frame_not_send_callback` is</span>
<span class="cm"> * invoked. Abort the following steps.</span>
<span class="cm"> * 4. If the frame is request HEADERS, the stream is opened</span>
<span class="cm"> * here.</span>
<span class="cm"> * 5. :member:`nghttp2_session_callbacks.before_frame_send_callback` is</span>
<span class="cm"> * invoked.</span>
<span class="cm"> * 6. :member:`nghttp2_session_callbacks.send_callback` is invoked one</span>
<span class="cm"> * or more times to send the frame.</span>
<span class="cm"> * 7. :member:`nghttp2_session_callbacks.on_frame_send_callback` is</span>
<span class="cm"> * invoked.</span>
<span class="cm"> * 8. If the transmission of the frame triggers closure of the stream,</span>
<span class="cm"> * the stream is closed and</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_stream_close_callback` is</span>
<span class="cm"> * invoked.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`</span>
<span class="cm"> * The callback function failed.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_send</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the serialized data to send.</span>
<span class="cm"> *</span>
<span class="cm"> * This function behaves like `nghttp2_session_send()` except that</span>
<span class="cm"> * it does not use :member:`nghttp2_session_callbacks.send_callback`</span>
<span class="cm"> * to transmit data. Instead, it assigns the pointer to the serialized</span>
<span class="cm"> * data to the |*data_ptr| and returns its length. The other callbacks</span>
<span class="cm"> * are called in the same way as they are in `nghttp2_session_send()`.</span>
<span class="cm"> *</span>
<span class="cm"> * If no data is available to send, this function returns 0.</span>
<span class="cm"> *</span>
<span class="cm"> * This function may not return all serialized data in one</span>
<span class="cm"> * invocation. To get all data, call this function repeatedly until it</span>
<span class="cm"> * returns 0 or one of negative error codes.</span>
<span class="cm"> *</span>
<span class="cm"> * The assigned |*data_ptr| is valid until the next call of</span>
<span class="cm"> * `nghttp2_session_mem_send()` or `nghttp2_session_send()`.</span>
<span class="cm"> *</span>
<span class="cm"> * The caller must send all data before sending the next chunk of</span>
<span class="cm"> * data.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns the length of the data pointed by the</span>
<span class="cm"> * |*data_ptr| if it succeeds, or one of the following negative error</span>
<span class="cm"> * codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">ssize_t</span> <span class="nf">nghttp2_session_mem_send</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">**</span><span class="n">data_ptr</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Receives frames from the remote peer.</span>
<span class="cm"> *</span>
<span class="cm"> * This function receives as many frames as possible until the user</span>
<span class="cm"> * callback :member:`nghttp2_session_callbacks.recv_callback` returns</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_WOULDBLOCK`. This function calls several</span>
<span class="cm"> * callback functions which are passed when initializing the</span>
<span class="cm"> * |session|. Here is the simple time chart which tells when each</span>
<span class="cm"> * callback is invoked:</span>
<span class="cm"> *</span>
<span class="cm"> * 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked one</span>
<span class="cm"> * or more times to receive frame header.</span>
<span class="cm"> * 2. If the frame is DATA frame:</span>
<span class="cm"> *</span>
<span class="cm"> * 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked</span>
<span class="cm"> * to receive DATA payload. For each chunk of data,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_data_chunk_recv_callback`</span>
<span class="cm"> * is invoked.</span>
<span class="cm"> * 2. If one DATA frame is completely received,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_frame_recv_callback` is</span>
<span class="cm"> * invoked. If the reception of the frame triggers the</span>
<span class="cm"> * closure of the stream,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_stream_close_callback`</span>
<span class="cm"> * is invoked.</span>
<span class="cm"> *</span>
<span class="cm"> * 3. If the frame is the control frame:</span>
<span class="cm"> *</span>
<span class="cm"> * 1. :member:`nghttp2_session_callbacks.recv_callback` is invoked</span>
<span class="cm"> * one or more times to receive whole frame.</span>
<span class="cm"> *</span>
<span class="cm"> * 2. If the received frame is valid, then following actions are</span>
<span class="cm"> * taken. If the frame is either HEADERS or PUSH_PROMISE,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_begin_headers_callback`</span>
<span class="cm"> * is invoked. Then</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_header_callback` is</span>
<span class="cm"> * invoked for each header name/value pair. After all name/value</span>
<span class="cm"> * pairs are emitted successfully,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_frame_recv_callback` is</span>
<span class="cm"> * invoked. For other frames,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_frame_recv_callback` is</span>
<span class="cm"> * invoked.</span>
<span class="cm"> * If the reception of the frame triggers the closure of the</span>
<span class="cm"> * stream,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_stream_close_callback`</span>
<span class="cm"> * is invoked.</span>
<span class="cm"> * 3. If the received frame is unpacked but is interpreted as</span>
<span class="cm"> * invalid,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_invalid_frame_recv_callback`</span>
<span class="cm"> * is invoked.</span>
<span class="cm"> * 4. If the received frame type is unknown,</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_unknown_frame_recv_callback`</span>
<span class="cm"> * is invoked.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_EOF`</span>
<span class="cm"> * The remote peer did shutdown on the connection.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`</span>
<span class="cm"> * The callback function failed.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_recv</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Processes data |in| as an input from the remote endpoint. The</span>
<span class="cm"> * |inlen| indicates the number of bytes in the |in|.</span>
<span class="cm"> *</span>
<span class="cm"> * This function behaves like `nghttp2_session_recv()` except that it</span>
<span class="cm"> * does not use :member:`nghttp2_session_callbacks.recv_callback` to</span>
<span class="cm"> * receive data; the |in| is the only data for the invocation of this</span>
<span class="cm"> * function. If all bytes are processed, this function returns. The</span>
<span class="cm"> * other callbacks are called in the same way as they are in</span>
<span class="cm"> * `nghttp2_session_recv()`.</span>
<span class="cm"> *</span>
<span class="cm"> * In the current implementation, this function always tries to</span>
<span class="cm"> * processes all input data unless either an error occurs or</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_PAUSE` is returned from</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_header_callback` or</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.on_data_chunk_recv_callback`.</span>
<span class="cm"> * If :enum:`NGHTTP2_ERR_PAUSE` is used, the return value includes the</span>
<span class="cm"> * number of bytes which was used to produce the data or frame for the</span>
<span class="cm"> * callback.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns the number of processed bytes, or one of the</span>
<span class="cm"> * following negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_CALLBACK_FAILURE`</span>
<span class="cm"> * The callback function failed.</span>
<span class="cm"> */</span>
<span class="kt">ssize_t</span> <span class="nf">nghttp2_session_mem_recv</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">in</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">inlen</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Puts back previously deferred DATA frame in the stream |stream_id|</span>
<span class="cm"> * to the outbound queue.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The stream does not exist or no deferred data exist.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_resume_data</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns nonzero value if |session| wants to receive data from the</span>
<span class="cm"> * remote peer.</span>
<span class="cm"> *</span>
<span class="cm"> * If both `nghttp2_session_want_read()` and</span>
<span class="cm"> * `nghttp2_session_want_write()` return 0, the application should</span>
<span class="cm"> * drop the connection.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_want_read</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns nonzero value if |session| wants to send data to the remote</span>
<span class="cm"> * peer.</span>
<span class="cm"> *</span>
<span class="cm"> * If both `nghttp2_session_want_read()` and</span>
<span class="cm"> * `nghttp2_session_want_write()` return 0, the application should</span>
<span class="cm"> * drop the connection.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_want_write</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns stream_user_data for the stream |stream_id|. The</span>
<span class="cm"> * stream_user_data is provided by `nghttp2_submit_request()`,</span>
<span class="cm"> * `nghttp2_submit_headers()` or</span>
<span class="cm"> * `nghttp2_session_set_stream_user_data()`. Unless it is set using</span>
<span class="cm"> * `nghttp2_session_set_stream_user_data()`, if the stream is</span>
<span class="cm"> * initiated by the remote endpoint, stream_user_data is always</span>
<span class="cm"> * ``NULL``. If the stream does not exist, this function returns</span>
<span class="cm"> * ``NULL``.</span>
<span class="cm"> */</span>
<span class="kt">void</span><span class="o">*</span> <span class="nf">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Sets the |stream_user_data| to the stream denoted by the</span>
<span class="cm"> * |stream_id|. If a stream user data is already set to the stream, it</span>
<span class="cm"> * is replaced with the |stream_user_data|. It is valid to specify</span>
<span class="cm"> * ``NULL`` in the |stream_user_data|, which nullifies the associated</span>
<span class="cm"> * data pointer.</span>
<span class="cm"> *</span>
<span class="cm"> * It is valid to set the |stream_user_data| to the stream reserved by</span>
<span class="cm"> * PUSH_PROMISE frame.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The stream does not exist</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_set_stream_user_data</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">stream_user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the number of frames in the outbound queue. This does not</span>
<span class="cm"> * include the deferred DATA frames.</span>
<span class="cm"> */</span>
<span class="kt">size_t</span> <span class="nf">nghttp2_session_get_outbound_queue_size</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the number of DATA payload in bytes received without</span>
<span class="cm"> * WINDOW_UPDATE transmission for the stream |stream_id|. The local</span>
<span class="cm"> * (receive) window size can be adjusted by</span>
<span class="cm"> * `nghttp2_submit_window_update()`. This function takes into account</span>
<span class="cm"> * that and returns effective data length. In particular, if the</span>
<span class="cm"> * local window size is reduced by submitting negative</span>
<span class="cm"> * window_size_increment with `nghttp2_submit_window_update()`, this</span>
<span class="cm"> * function returns the number of bytes less than actually received.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns -1 if it fails.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="nf">nghttp2_session_get_stream_effective_recv_data_length</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the local (receive) window size for the stream</span>
<span class="cm"> * |stream_id|. The local window size can be adjusted by</span>
<span class="cm"> * `nghttp2_submit_window_update()`. This function takes into account</span>
<span class="cm"> * that and returns effective window size.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns -1 if it fails.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="nf">nghttp2_session_get_stream_effective_local_window_size</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the number of DATA payload in bytes received without</span>
<span class="cm"> * WINDOW_UPDATE transmission for a connection. The local (receive)</span>
<span class="cm"> * window size can be adjusted by</span>
<span class="cm"> * `nghttp2_submit_window_update()`. This function takes into account</span>
<span class="cm"> * that and returns effective data length. In particular, if the local</span>
<span class="cm"> * window size is reduced by submitting negative window_size_increment</span>
<span class="cm"> * with `nghttp2_submit_window_update()`, this function returns the</span>
<span class="cm"> * number of bytes less than actually received.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns -1 if it fails.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="nf">nghttp2_session_get_effective_recv_data_length</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns the local (receive) window size for a connection. The local</span>
<span class="cm"> * window size can be adjusted by</span>
<span class="cm"> * `nghttp2_submit_window_update()`. This function takes into account</span>
<span class="cm"> * that and returns effective window size.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns -1 if it fails.</span>
<span class="cm"> */</span>
<span class="kt">int32_t</span> <span class="nf">nghttp2_session_get_effective_local_window_size</span>
<span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Signals the session so that the connection should be terminated.</span>
<span class="cm"> *</span>
<span class="cm"> * GOAWAY frame with the given |error_code| will be submitted if it</span>
<span class="cm"> * has not been transmitted. After the transmission, both</span>
<span class="cm"> * `nghttp2_session_want_read()` and `nghttp2_session_want_write()`</span>
<span class="cm"> * return 0. If GOAWAY frame has already transmitted at the time when</span>
<span class="cm"> * this function is invoked, `nghttp2_session_want_read()` and</span>
<span class="cm"> * `nghttp2_session_want_write()` returns 0 immediately after this</span>
<span class="cm"> * function succeeds.</span>
<span class="cm"> *</span>
<span class="cm"> * This function should be called when the connection should be</span>
<span class="cm"> * terminated after sending GOAWAY. If the remaining streams should be</span>
<span class="cm"> * processed after GOAWAY, use `nghttp2_submit_goaway()` instead.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_terminate_session</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Performs post-process of HTTP Upgrade request. This function can be</span>
<span class="cm"> * called from both client and server, but the behavior is very</span>
<span class="cm"> * different in each other.</span>
<span class="cm"> *</span>
<span class="cm"> * If called from client side, the |settings_payload| must be the</span>
<span class="cm"> * value sent in ``HTTP2-Settings`` header field and must be decoded</span>
<span class="cm"> * by base64url decoder. The |settings_payloadlen| is the length of</span>
<span class="cm"> * |settings_payload|. The |settings_payload| is unpacked and its</span>
<span class="cm"> * setting values will be submitted using</span>
<span class="cm"> * `nghttp2_submit_settings()`. This means that the client application</span>
<span class="cm"> * code does not need to submit SETTINGS by itself. The stream with</span>
<span class="cm"> * stream ID=1 is opened and the |stream_user_data| is used for its</span>
<span class="cm"> * stream_user_data. The opened stream becomes half-closed (local)</span>
<span class="cm"> * state.</span>
<span class="cm"> *</span>
<span class="cm"> * If called from server side, the |settings_payload| must be the</span>
<span class="cm"> * value received in ``HTTP2-Settings`` header field and must be</span>
<span class="cm"> * decoded by base64url decoder. The |settings_payloadlen| is the</span>
<span class="cm"> * length of |settings_payload|. It is treated as if the SETTINGS</span>
<span class="cm"> * frame with that payload is received. Thus, callback functions for</span>
<span class="cm"> * the reception of SETTINGS frame will be invoked. The stream with</span>
<span class="cm"> * stream ID=1 is opened. The |stream_user_data| is ignored. The</span>
<span class="cm"> * opened stream becomes half-closed (remote).</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |settings_payload| is badly formed.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_PROTO`</span>
<span class="cm"> * The stream ID 1 is already used or closed; or is not available;</span>
<span class="cm"> * or the |settings_payload| does not include both</span>
<span class="cm"> * :enum:`NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS` and</span>
<span class="cm"> * :enum:`NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE`.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_session_upgrade</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">settings_payload</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">settings_payloadlen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">stream_user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Serializes the SETTINGS values |iv| in the |buf|. The size of the</span>
<span class="cm"> * |buf| is specified by |buflen|. The number of entries in the |iv|</span>
<span class="cm"> * array is given by |niv|. The required space in |buf| for the |niv|</span>
<span class="cm"> * entries is ``8*niv`` bytes and if the given buffer is too small, an</span>
<span class="cm"> * error is returned. This function is used mainly for creating a</span>
<span class="cm"> * SETTINGS payload to be sent with the ``HTTP2-Settings`` header</span>
<span class="cm"> * field in an HTTP Upgrade request. The data written in |buf| is NOT</span>
<span class="cm"> * base64url encoded and the application is responsible for encoding.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns the number of bytes written in |buf|, or one</span>
<span class="cm"> * of the following negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |iv| contains duplicate settings ID or invalid value.</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INSUFF_BUFSIZE`</span>
<span class="cm"> * The provided |buflen| size is too small to hold the output.</span>
<span class="cm"> */</span>
<span class="kt">ssize_t</span> <span class="nf">nghttp2_pack_settings_payload</span><span class="p">(</span><span class="kt">uint8_t</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">buflen</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_settings_entry</span> <span class="o">*</span><span class="n">iv</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">niv</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns string describing the |lib_error_code|. The</span>
<span class="cm"> * |lib_error_code| must be one of the :enum:`nghttp2_error`.</span>
<span class="cm"> */</span>
<span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="nf">nghttp2_strerror</span><span class="p">(</span><span class="kt">int</span> <span class="n">lib_error_code</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits HEADERS frame and optionally one or more DATA frames.</span>
<span class="cm"> *</span>
<span class="cm"> * The |pri| is priority of this request. 0 is the highest priority</span>
<span class="cm"> * value and :macro:`NGHTTP2_PRI_LOWEST` is the lowest value.</span>
<span class="cm"> *</span>
<span class="cm"> * The |nva| is an array of name/value pair :type:`nghttp2_nv` with</span>
<span class="cm"> * |nvlen| elements. The value is opaque sequence of bytes and</span>
<span class="cm"> * therefore can contain NULL byte (0x0). If the application requires</span>
<span class="cm"> * that the ordering of values for a single header field name</span>
<span class="cm"> * appearing in different header fields, it has to concatenate them</span>
<span class="cm"> * using NULL byte (0x0) before passing them to this function.</span>
<span class="cm"> *</span>
<span class="cm"> * HTTP/2.0 specification has requirement about header fields in the</span>
<span class="cm"> * request HEADERS. See the specification for more details.</span>
<span class="cm"> *</span>
<span class="cm"> * This function creates copies of all name/value pairs in |nva|. It</span>
<span class="cm"> * also lower-cases all names in |nva|.</span>
<span class="cm"> *</span>
<span class="cm"> * If |data_prd| is not ``NULL``, it provides data which will be sent</span>
<span class="cm"> * in subsequent DATA frames. In this case, a method that allows</span>
<span class="cm"> * request message bodies</span>
<span class="cm"> * (http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9) must</span>
<span class="cm"> * be specified with ``:method`` key in |nva| (e.g. ``POST``). This</span>
<span class="cm"> * function does not take ownership of the |data_prd|. The function</span>
<span class="cm"> * copies the members of the |data_prd|. If |data_prd| is ``NULL``,</span>
<span class="cm"> * HEADERS have END_STREAM set. The |stream_user_data| is data</span>
<span class="cm"> * associated to the stream opened by this request and can be an</span>
<span class="cm"> * arbitrary pointer, which can be retrieved later by</span>
<span class="cm"> * `nghttp2_session_get_stream_user_data()`.</span>
<span class="cm"> *</span>
<span class="cm"> * Since the library reorders the frames and tries to send the highest</span>
<span class="cm"> * prioritized one first and the HTTP/2.0 specification requires the</span>
<span class="cm"> * stream ID must be strictly increasing, the stream ID of this</span>
<span class="cm"> * request cannot be known until it is about to sent. To know the</span>
<span class="cm"> * stream ID of the request, the application can use</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.before_frame_send_callback`. This</span>
<span class="cm"> * callback is called just before the frame is sent. For HEADERS</span>
<span class="cm"> * frame, the argument frame has the stream ID assigned. Also since</span>
<span class="cm"> * the stream is already opened,</span>
<span class="cm"> * `nghttp2_session_get_stream_user_data()` can be used to get</span>
<span class="cm"> * |stream_user_data| to identify which HEADERS we are processing.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |pri| is invalid</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_request</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">pri</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_data_provider</span> <span class="o">*</span><span class="n">data_prd</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">stream_user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits response HEADERS frame and optionally one or more DATA</span>
<span class="cm"> * frames against the stream |stream_id|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |nva| is an array of name/value pair :type:`nghttp2_nv` with</span>
<span class="cm"> * |nvlen| elements. The value is opaque sequence of bytes and</span>
<span class="cm"> * therefore can contain NULL byte (0x0). If the application requires</span>
<span class="cm"> * that the ordering of values for a single header field name</span>
<span class="cm"> * appearing in different header fields, it has to concatenate them</span>
<span class="cm"> * using NULL byte (0x0) before passing them to this function.</span>
<span class="cm"> *</span>
<span class="cm"> * HTTP/2.0 specification has requirement about header fields in the</span>
<span class="cm"> * response HEADERS. See the specification for more details.</span>
<span class="cm"> *</span>
<span class="cm"> * This function creates copies of all name/value pairs in |nva|. It</span>
<span class="cm"> * also lower-cases all names in |nva|.</span>
<span class="cm"> *</span>
<span class="cm"> * If |data_prd| is not ``NULL``, it provides data which will be sent</span>
<span class="cm"> * in subsequent DATA frames. This function does not take ownership</span>
<span class="cm"> * of the |data_prd|. The function copies the members of the</span>
<span class="cm"> * |data_prd|. If |data_prd| is ``NULL``, HEADERS will have</span>
<span class="cm"> * END_STREAM flag set.</span>
<span class="cm"> *</span>
<span class="cm"> * This method can be used as normal HTTP response and push</span>
<span class="cm"> * response. When pushing a resource using this function, the</span>
<span class="cm"> * |session| must be configured using `nghttp2_session_server_new()`</span>
<span class="cm"> * or its variants and the target stream denoted by the |stream_id|</span>
<span class="cm"> * must be reserved using `nghttp2_submit_push_promise()`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_response</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_data_provider</span> <span class="o">*</span><span class="n">data_prd</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits HEADERS frame. The |flags| is bitwise OR of the</span>
<span class="cm"> * following values:</span>
<span class="cm"> *</span>
<span class="cm"> * * :enum:`NGHTTP2_FLAG_END_STREAM`</span>
<span class="cm"> * * :enum:`NGHTTP2_FLAG_PRIORITY`</span>
<span class="cm"> *</span>
<span class="cm"> * If |flags| includes :enum:`NGHTTP2_FLAG_END_STREAM`, this frame has</span>
<span class="cm"> * END_STREAM flag set.</span>
<span class="cm"> *</span>
<span class="cm"> * The library handles the CONTINUATION frame internally and it</span>
<span class="cm"> * correctly sets END_HEADERS to the last sequence of the PUSH_PROMISE</span>
<span class="cm"> * or CONTINUATION frame.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |stream_id| is -1, this frame is assumed as request (i.e.,</span>
<span class="cm"> * request HEADERS frame which opens new stream). In this case, the</span>
<span class="cm"> * actual stream ID is assigned just before the frame is sent. For</span>
<span class="cm"> * response, specify stream ID in |stream_id|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |pri| is priority of this request.</span>
<span class="cm"> *</span>
<span class="cm"> * The |nva| is an array of name/value pair :type:`nghttp2_nv` with</span>
<span class="cm"> * |nvlen| elements. The value is opaque sequence of bytes and</span>
<span class="cm"> * therefore can contain NULL byte (0x0). If the application requires</span>
<span class="cm"> * that the ordering of values for a single header field name</span>
<span class="cm"> * appearing in different header fields, it has to concatenate them</span>
<span class="cm"> * using NULL byte (0x0) before passing them to this function.</span>
<span class="cm"> *</span>
<span class="cm"> * This function creates copies of all name/value pairs in |nva|. It</span>
<span class="cm"> * also lower-cases all names in |nva|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |stream_user_data| is a pointer to an arbitrary data which is</span>
<span class="cm"> * associated to the stream this frame will open. Therefore it is only</span>
<span class="cm"> * used if this frame opens streams, in other words, it changes stream</span>
<span class="cm"> * state from idle or reserved to open.</span>
<span class="cm"> *</span>
<span class="cm"> * This function is low-level in a sense that the application code can</span>
<span class="cm"> * specify flags directly. For usual HTTP request,</span>
<span class="cm"> * `nghttp2_submit_request()` is useful.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |pri| is invalid</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_headers</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">pri</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">stream_user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits one or more DATA frames to the stream |stream_id|. The</span>
<span class="cm"> * data to be sent are provided by |data_prd|. If |flags| contains</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_END_STREAM`, the last DATA frame has END_STREAM</span>
<span class="cm"> * flag set.</span>
<span class="cm"> *</span>
<span class="cm"> * This function does not take ownership of the |data_prd|. The</span>
<span class="cm"> * function copies the members of the |data_prd|.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_data</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_data_provider</span> <span class="o">*</span><span class="n">data_prd</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits PRIORITY frame to change the priority of stream |stream_id|</span>
<span class="cm"> * to the priority value |pri|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |pri| is negative.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_priority</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">pri</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits RST_STREAM frame to cancel/reject the stream |stream_id|</span>
<span class="cm"> * with the error code |error_code|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_rst_stream</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Stores local settings and submits SETTINGS frame. The |iv| is the</span>
<span class="cm"> * pointer to the array of :type:`nghttp2_settings_entry`. The |niv|</span>
<span class="cm"> * indicates the number of :type:`nghttp2_settings_entry`.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * This function does not take ownership of the |iv|. This function</span>
<span class="cm"> * copies all the elements in the |iv|.</span>
<span class="cm"> *</span>
<span class="cm"> * While updating individual stream&#39;s local window size, if the window</span>
<span class="cm"> * size becomes strictly larger than NGHTTP2_MAX_WINDOW_SIZE,</span>
<span class="cm"> * RST_STREAM is issued against such a stream.</span>
<span class="cm"> *</span>
<span class="cm"> * SETTINGS with :enum:`NGHTTP2_FLAG_ACK` is automatically submitted</span>
<span class="cm"> * by the library and application could not send it at its will.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`</span>
<span class="cm"> * The |iv| contains invalid value (e.g., initial window size</span>
<span class="cm"> * strictly greater than (1 &lt;&lt; 31) - 1.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_settings</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_settings_entry</span> <span class="o">*</span><span class="n">iv</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">niv</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits PUSH_PROMISE frame.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored. The library handles the</span>
<span class="cm"> * CONTINUATION frame internally and it correctly sets END_HEADERS to</span>
<span class="cm"> * the last sequence of the PUSH_PROMISE or CONTINUATION frame.</span>
<span class="cm"> *</span>
<span class="cm"> * The |stream_id| must be client initiated stream ID.</span>
<span class="cm"> *</span>
<span class="cm"> * The |nva| is an array of name/value pair :type:`nghttp2_nv` with</span>
<span class="cm"> * |nvlen| elements. The value is opaque sequence of bytes and</span>
<span class="cm"> * therefore can contain NULL byte (0x0). If the application requires</span>
<span class="cm"> * that the ordering of values for a single header field name</span>
<span class="cm"> * appearing in different header fields, it has to concatenate them</span>
<span class="cm"> * using NULL byte (0x0) before passing them to this function.</span>
<span class="cm"> *</span>
<span class="cm"> * This function creates copies of all name/value pairs in |nva|. It</span>
<span class="cm"> * also lower-cases all names in |nva|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |promised_stream_user_data| is a pointer to an arbitrary data</span>
<span class="cm"> * which is associated to the promised stream this frame will open and</span>
<span class="cm"> * make it in reserved state. It is available using</span>
<span class="cm"> * `nghttp2_session_get_stream_user_data()`. The application can</span>
<span class="cm"> * access it in :type:`nghttp2_before_frame_send_callback` and</span>
<span class="cm"> * :type:`nghttp2_on_frame_send_callback` of this frame.</span>
<span class="cm"> *</span>
<span class="cm"> * Since the library reorders the frames and tries to send the highest</span>
<span class="cm"> * prioritized one first and the HTTP/2.0 specification requires the</span>
<span class="cm"> * stream ID must be strictly increasing, the promised stream ID</span>
<span class="cm"> * cannot be known until it is about to sent. To know the promised</span>
<span class="cm"> * stream ID, the application can use</span>
<span class="cm"> * :member:`nghttp2_session_callbacks.before_frame_send_callback`. This</span>
<span class="cm"> * callback is called just before the frame is sent. For PUSH_PROMISE</span>
<span class="cm"> * frame, the argument frame has the promised stream ID assigned.</span>
<span class="cm"> *</span>
<span class="cm"> * The client side can use this function to send PUSH_PROMISE to the</span>
<span class="cm"> * server. But in normal HTTP usage, the server may treat it error.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_push_promise</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">promised_stream_user_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits PING frame. You don&#39;t have to send PING back when you</span>
<span class="cm"> * received PING frame. The library automatically submits PING frame</span>
<span class="cm"> * in this case.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |opaque_data| is non ``NULL``, then it should point to the 8</span>
<span class="cm"> * bytes array of memory to specify opaque data to send with PING</span>
<span class="cm"> * frame. If the |opaque_data| is ``NULL``, zero-cleared 8 bytes will</span>
<span class="cm"> * be sent as opaque data.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_ping</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">opaque_data</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits GOAWAY frame with the error code |error_code|.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |opaque_data| is not ``NULL`` and |opaque_data_len| is not</span>
<span class="cm"> * zero, those data will be sent as additional debug data. The</span>
<span class="cm"> * library makes a copy of the memory region pointed by |opaque_data|</span>
<span class="cm"> * with the length |opaque_data_len|, so the caller does not need to</span>
<span class="cm"> * keep this memory after the return of this function. If the</span>
<span class="cm"> * |opaque_data_len| is 0, the |opaque_data| could be ``NULL``.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_goaway</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="n">nghttp2_error_code</span> <span class="n">error_code</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">opaque_data</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">opaque_data_len</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Submits WINDOW_UPDATE frame.</span>
<span class="cm"> *</span>
<span class="cm"> * The |flags| is currently ignored and should be</span>
<span class="cm"> * :enum:`NGHTTP2_FLAG_NONE`.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |window_size_increment| is positive, the WINDOW_UPDATE with</span>
<span class="cm"> * that value as window_size_increment is queued. If the</span>
<span class="cm"> * |window_size_increment| is larger than the received bytes from the</span>
<span class="cm"> * remote endpoint, the local window size is increased by that</span>
<span class="cm"> * difference.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |window_size_increment| is negative, the local window size</span>
<span class="cm"> * is decreased by -|window_size_increment|. If</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_NO_AUTO_STREAM_WINDOW_UPDATE` (or</span>
<span class="cm"> * :enum:`NGHTTP2_OPT_NO_AUTO_CONNECTION_WINDOW_UPDATE` if |stream_id|</span>
<span class="cm"> * is 0) is not set and the library decided that the WINDOW_UPDATE</span>
<span class="cm"> * should be submitted, then WINDOW_UPDATE is queued with the current</span>
<span class="cm"> * received bytes count.</span>
<span class="cm"> *</span>
<span class="cm"> * If the |window_size_increment| is 0, the function does nothing and</span>
<span class="cm"> * returns 0.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_FLOW_CONTROL`</span>
<span class="cm"> * The local window size overflow or gets negative.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_submit_window_update</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">window_size_increment</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Compares lhs-&gt;name with lhs-&gt;namelen bytes and rhs-&gt;name with</span>
<span class="cm"> * rhs-&gt;namelen bytes. Returns negative integer if lhs-&gt;name is found</span>
<span class="cm"> * to be less than rhs-&gt;name; or returns positive integer if lhs-&gt;name</span>
<span class="cm"> * is found to be greater than rhs-&gt;name; or returns 0 otherwise.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_nv_compare_name</span><span class="p">(</span><span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">lhs</span><span class="p">,</span> <span class="k">const</span> <span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">rhs</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * A helper function for dealing with NPN in client side or ALPN in</span>
<span class="cm"> * server side. The |in| contains peer&#39;s protocol list in preferable</span>
<span class="cm"> * order. The format of |in| is length-prefixed and not</span>
<span class="cm"> * null-terminated. For example, ``HTTP-draft-04/2.0`` and</span>
<span class="cm"> * ``http/1.1`` stored in |in| like this::</span>
<span class="cm"> *</span>
<span class="cm"> * in[0] = 17</span>
<span class="cm"> * in[1..17] = &quot;HTTP-draft-04/2.0&quot;</span>
<span class="cm"> * in[18] = 8</span>
<span class="cm"> * in[19..26] = &quot;http/1.1&quot;</span>
<span class="cm"> * inlen = 27</span>
<span class="cm"> *</span>
<span class="cm"> * The selection algorithm is as follows:</span>
<span class="cm"> *</span>
<span class="cm"> * 1. If peer&#39;s list contains HTTP/2.0 protocol the library supports,</span>
<span class="cm"> * it is selected and returns 1. The following step is not taken.</span>
<span class="cm"> *</span>
<span class="cm"> * 2. If peer&#39;s list contains ``http/1.1``, this function selects</span>
<span class="cm"> * ``http/1.1`` and returns 0. The following step is not taken.</span>
<span class="cm"> *</span>
<span class="cm"> * 3. This function selects nothing and returns -1. (So called</span>
<span class="cm"> * non-overlap case). In this case, |out| and |outlen| are left</span>
<span class="cm"> * untouched.</span>
<span class="cm"> *</span>
<span class="cm"> * Selecting ``HTTP-draft-04/2.0`` means that ``HTTP-draft-04/2.0`` is</span>
<span class="cm"> * written into |*out| and its length (which is 17) is</span>
<span class="cm"> * assigned to |*outlen|.</span>
<span class="cm"> *</span>
<span class="cm"> * For ALPN, refer to</span>
<span class="cm"> * http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-04</span>
<span class="cm"> *</span>
<span class="cm"> * See http://technotes.googlecode.com/git/nextprotoneg.html for more</span>
<span class="cm"> * details about NPN.</span>
<span class="cm"> *</span>
<span class="cm"> * For NPN, to use this method you should do something like::</span>
<span class="cm"> *</span>
<span class="cm"> * static int select_next_proto_cb(SSL* ssl,</span>
<span class="cm"> * unsigned char **out,</span>
<span class="cm"> * unsigned char *outlen,</span>
<span class="cm"> * const unsigned char *in,</span>
<span class="cm"> * unsigned int inlen,</span>
<span class="cm"> * void *arg)</span>
<span class="cm"> * {</span>
<span class="cm"> * int rv;</span>
<span class="cm"> * rv = nghttp2_select_next_protocol(out, outlen, in, inlen);</span>
<span class="cm"> * if(rv == 1) {</span>
<span class="cm"> * ((MyType*)arg)-&gt;http2_selected = 1;</span>
<span class="cm"> * }</span>
<span class="cm"> * return SSL_TLSEXT_ERR_OK;</span>
<span class="cm"> * }</span>
<span class="cm"> * ...</span>
<span class="cm"> * SSL_CTX_set_next_proto_select_cb(ssl_ctx, select_next_proto_cb, my_obj);</span>
<span class="cm"> *</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_select_next_protocol</span><span class="p">(</span><span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">**</span><span class="n">out</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">*</span><span class="n">outlen</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">*</span><span class="n">in</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">inlen</span><span class="p">);</span>
<span class="k">struct</span> <span class="n">nghttp2_gzip</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @struct</span>
<span class="cm"> *</span>
<span class="cm"> * The gzip stream to inflate data. The details of this structure are</span>
<span class="cm"> * intentionally hidden from the public API.</span>
<span class="cm"> */</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="n">nghttp2_gzip</span> <span class="n">nghttp2_gzip</span><span class="p">;</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * A helper function to set up a per request gzip stream to inflate data.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_GZIP`</span>
<span class="cm"> * The initialization of gzip stream failed.</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_NOMEM`</span>
<span class="cm"> * Out of memory.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_gzip_inflate_new</span><span class="p">(</span><span class="n">nghttp2_gzip</span> <span class="o">**</span><span class="n">inflater_ptr</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Frees the inflate stream. The |inflater| may be ``NULL``.</span>
<span class="cm"> */</span>
<span class="kt">void</span> <span class="nf">nghttp2_gzip_inflate_del</span><span class="p">(</span><span class="n">nghttp2_gzip</span> <span class="o">*</span><span class="n">inflater</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Inflates data in |in| with the length |*inlen_ptr| and stores the</span>
<span class="cm"> * inflated data to |out| which has allocated size at least</span>
<span class="cm"> * |*outlen_ptr|. On return, |*outlen_ptr| is updated to represent</span>
<span class="cm"> * the number of data written in |out|. Similarly, |*inlen_ptr| is</span>
<span class="cm"> * updated to represent the number of input bytes processed.</span>
<span class="cm"> *</span>
<span class="cm"> * This function returns 0 if it succeeds, or one of the following</span>
<span class="cm"> * negative error codes:</span>
<span class="cm"> *</span>
<span class="cm"> * :enum:`NGHTTP2_ERR_GZIP`</span>
<span class="cm"> * The inflation of gzip stream failed.</span>
<span class="cm"> *</span>
<span class="cm"> * The example follows::</span>
<span class="cm"> *</span>
<span class="cm"> * void on_data_chunk_recv_callback(nghttp2_session *session,</span>
<span class="cm"> * uint8_t flags,</span>
<span class="cm"> * int32_t stream_id,</span>
<span class="cm"> * const uint8_t *data, size_t len,</span>
<span class="cm"> * void *user_data)</span>
<span class="cm"> * {</span>
<span class="cm"> * ...</span>
<span class="cm"> * req = nghttp2_session_get_stream_user_data(session, stream_id);</span>
<span class="cm"> * nghttp2_gzip *inflater = req-&gt;inflater;</span>
<span class="cm"> * while(len &gt; 0) {</span>
<span class="cm"> * uint8_t out[MAX_OUTLEN];</span>
<span class="cm"> * size_t outlen = MAX_OUTLEN;</span>
<span class="cm"> * size_t tlen = len;</span>
<span class="cm"> * int rv;</span>
<span class="cm"> * rv = nghttp2_gzip_inflate(inflater, out, &amp;outlen, data, &amp;tlen);</span>
<span class="cm"> * if(rv != 0) {</span>
<span class="cm"> * nghttp2_submit_rst_stream(session, stream_id,</span>
<span class="cm"> * NGHTTP2_INTERNAL_ERROR);</span>
<span class="cm"> * break;</span>
<span class="cm"> * }</span>
<span class="cm"> * ... Do stuff ...</span>
<span class="cm"> * data += tlen;</span>
<span class="cm"> * len -= tlen;</span>
<span class="cm"> * }</span>
<span class="cm"> * ....</span>
<span class="cm"> * }</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_gzip_inflate</span><span class="p">(</span><span class="n">nghttp2_gzip</span> <span class="o">*</span><span class="n">inflater</span><span class="p">,</span>
<span class="kt">uint8_t</span> <span class="o">*</span><span class="n">out</span><span class="p">,</span> <span class="kt">size_t</span> <span class="o">*</span><span class="n">outlen_ptr</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">in</span><span class="p">,</span> <span class="kt">size_t</span> <span class="o">*</span><span class="n">inlen_ptr</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns a pointer to a nghttp2_info struct with version information about</span>
<span class="cm"> * the run-time library in use. The |least_version| argument can be set to a</span>
<span class="cm"> * 24 bit numerical value for the least accepted version number and if the</span>
<span class="cm"> * condition is not met, this function will return a NULL. Pass in 0 to skip</span>
<span class="cm"> * the version checking.</span>
<span class="cm"> */</span>
<span class="n">nghttp2_info</span> <span class="o">*</span><span class="nf">nghttp2_version</span><span class="p">(</span><span class="kt">int</span> <span class="n">least_version</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns nonzero if the :type:`nghttp2_error` library error code</span>
<span class="cm"> * |lib_error| is fatal.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_is_fatal</span><span class="p">(</span><span class="kt">int</span> <span class="n">lib_error</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns nonzero if HTTP header field name |name| of length |len| is</span>
<span class="cm"> * valid according to</span>
<span class="cm"> * http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#section-3.2</span>
<span class="cm"> *</span>
<span class="cm"> * Because this is a header field name in HTTP2, the upper cased alphabet</span>
<span class="cm"> * is treated as error.</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_check_header_name</span><span class="p">(</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">);</span>
<span class="cm">/**</span>
<span class="cm"> * @function</span>
<span class="cm"> *</span>
<span class="cm"> * Returns nonzero if HTTP header field value |value| of length |len|</span>
<span class="cm"> * is valid according to</span>
<span class="cm"> * http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-25#section-3.2</span>
<span class="cm"> *</span>
<span class="cm"> * Because this is HTTP2 header field value, it can contain NULL</span>
<span class="cm"> * character (0x00).</span>
<span class="cm"> */</span>
<span class="kt">int</span> <span class="nf">nghttp2_check_header_value</span><span class="p">(</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">);</span>
<span class="cp">#ifdef __cplusplus</span>
<span class="p">}</span>
<span class="cp">#endif</span>
<span class="cp">#endif </span><span class="cm">/* NGHTTP2_H */</span><span class="cp"></span>
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