nghttp2/lib/nghttp2_helper.h

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/*
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* nghttp2 - HTTP/2.0 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
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#ifndef NGHTTP2_HELPER_H
#define NGHTTP2_HELPER_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
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#include <nghttp2/nghttp2.h>
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#define nghttp2_min(A, B) ((A) < (B) ? (A) : (B))
#define nghttp2_max(A, B) ((A) > (B) ? (A) : (B))
/*
* Copies 2 byte unsigned integer |n| in host byte order to |buf| in
* network byte order.
*/
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void nghttp2_put_uint16be(uint8_t *buf, uint16_t n);
/*
* Copies 4 byte unsigned integer |n| in host byte order to |buf| in
* network byte order.
*/
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void nghttp2_put_uint32be(uint8_t *buf, uint32_t n);
/*
* Retrieves 2 byte unsigned integer stored in |data| in network byte
* order and returns it in host byte order.
*/
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uint16_t nghttp2_get_uint16(const uint8_t *data);
/*
* Retrieves 4 byte unsigned integer stored in |data| in network byte
* order and returns it in host byte order.
*/
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uint32_t nghttp2_get_uint32(const uint8_t *data);
/*
* Ensures that buffer |*buf_ptr| with |*buflen_ptr| length has at
* least |min_length| bytes. If |min_length| > |*buflen_ptr|,
* allocates new buffer having at least |min_length| bytes and assigns
* its pointer to |*buf_ptr| and allocated number of bytes to
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* |*buflen_ptr|. The memory pointed by |*buf_ptr| previously may
* change. No memory copy is done between old and new buffer.
* |*buf_ptr| and |*buflen_ptr| are only updated iff this function
* succeeds.
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*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
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* NGHTTP2_ERR_NOMEM
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* Out of memory.
*/
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int nghttp2_reserve_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t min_length);
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/*
* Allocates |n| bytes of memory and copy the meory region pointed by
* |src| with the length |n| bytes into it. Returns the allocated memory.
*
* This function returns pointer to allocated memory, or one of the
* following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory.
*/
void* nghttp2_memdup(const void* src, size_t n);
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void nghttp2_downcase(uint8_t *s, size_t len);
/*
* Adjusts |*local_window_size_ptr|, |*recv_window_size_ptr|,
* |*recv_reduction_ptr| with |*delta_ptr| which is the
* WINDOW_UPDATE's window_size_increment sent from local side. If
* |delta| is strictly larger than |*recv_window_size_ptr|,
* |*local_window_size_ptr| is increased by delta -
* *recv_window_size_ptr. If |delta| is negative,
* |*local_window_size_ptr| is decreased by delta.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_FLOW_CONTROL
* local_window_size overflow or gets negative.
*/
int nghttp2_adjust_local_window_size(int32_t *local_window_size_ptr,
int32_t *recv_window_size_ptr,
int32_t *recv_reduction_ptr,
int32_t *delta_ptr);
/*
* Returns non-zero if the function decided that WINDOW_UPDATE should
* be sent.
*/
int nghttp2_should_send_window_update(int32_t local_window_size,
int32_t recv_window_size);
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/*
* Deallocates memory space pointed by |ptr|. This function exists for
* the application to free the memory space allocated by the library
* functions. Currently this function is hidden from the public API,
* but may be exposed as public API.
*/
void nghttp2_free(void *ptr);
/*
* Copies the buffer |src| of length |len| to the destination pointed
* by the |dest|, assuming that the |dest| is at lest |len| bytes long
* . Returns dest + len.
*/
uint8_t* nghttp2_cpymem(uint8_t *dest, const void *src, size_t len);
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#endif /* NGHTTP2_HELPER_H */