nghttp2/lib/nghttp2_helper.c

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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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#include "nghttp2_helper.h"
#include <assert.h>
#include <string.h>
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#include "nghttp2_net.h"
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void nghttp2_put_uint16be(uint8_t *buf, uint16_t n)
{
uint16_t x = htons(n);
memcpy(buf, &x, sizeof(uint16_t));
}
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void nghttp2_put_uint32be(uint8_t *buf, uint32_t n)
{
uint32_t x = htonl(n);
memcpy(buf, &x, sizeof(uint32_t));
}
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uint16_t nghttp2_get_uint16(const uint8_t *data)
{
uint16_t n;
memcpy(&n, data, sizeof(uint16_t));
return ntohs(n);
}
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uint32_t nghttp2_get_uint32(const uint8_t *data)
{
uint32_t n;
memcpy(&n, data, sizeof(uint32_t));
return ntohl(n);
}
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int nghttp2_reserve_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t min_length)
{
if(min_length > *buflen_ptr) {
uint8_t *temp;
min_length = (min_length+4095)/4096*4096;
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temp = realloc(*buf_ptr, min_length);
if(temp == NULL) {
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return NGHTTP2_ERR_NOMEM;
} else {
*buf_ptr = temp;
*buflen_ptr = min_length;
}
}
return 0;
}
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void* nghttp2_memdup(const void* src, size_t n)
{
void* dest = malloc(n);
if(dest == NULL) {
return NULL;
}
memcpy(dest, src, n);
return dest;
}
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void nghttp2_downcase(uint8_t *s, size_t len)
{
size_t i;
for(i = 0; i < len; ++i) {
if('A' <= s[i] && s[i] <= 'Z') {
s[i] += 'a'-'A';
}
}
}
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)
{
if(*delta_ptr > 0) {
int32_t new_recv_window_size =
nghttp2_max(0, *recv_window_size_ptr) - *delta_ptr;
if(new_recv_window_size < 0) {
/* The delta size is strictly more than received bytes. Increase
local_window_size by that difference. */
int32_t recv_reduction_diff;
if(*local_window_size_ptr >
NGHTTP2_MAX_WINDOW_SIZE + new_recv_window_size) {
return NGHTTP2_ERR_FLOW_CONTROL;
}
*local_window_size_ptr -= new_recv_window_size;
/* If there is recv_reduction due to earlier window_size
reduction, we have to adjust it too. */
recv_reduction_diff = nghttp2_min(*recv_reduction_ptr,
-new_recv_window_size);
*recv_reduction_ptr -= recv_reduction_diff;
if(*recv_window_size_ptr < 0) {
*recv_window_size_ptr += recv_reduction_diff;
} else {
/* If *recv_window_size_ptr > 0, then those bytes are
considered to be backed to the remote peer, so it is
effectively 0 now. */
*recv_window_size_ptr = recv_reduction_diff;
}
/* recv_reduction_diff must be paied from *delta_ptr, since it
was added in window size reduction (see below). */
*delta_ptr -= recv_reduction_diff;
} else {
*recv_window_size_ptr = new_recv_window_size;
}
return 0;
} else {
if(*local_window_size_ptr + *delta_ptr < 0 ||
*recv_window_size_ptr < INT32_MIN - *delta_ptr ||
*recv_reduction_ptr > INT32_MAX + *delta_ptr) {
return NGHTTP2_ERR_FLOW_CONTROL;
}
/* Decreasing local window size. Note that we achieve this without
noticing to the remote peer. To do this, we cut
recv_window_size by -delta. This means that we don't send
WINDOW_UPDATE for -delta bytes. */
*local_window_size_ptr += *delta_ptr;
*recv_window_size_ptr += *delta_ptr;
*recv_reduction_ptr -= *delta_ptr;
}
return 0;
}
int nghttp2_should_send_window_update(int32_t local_window_size,
int32_t recv_window_size)
{
return recv_window_size >= local_window_size / 2;
}
static int VALID_HD_NAME_CHARS[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1 /* ! */,
-1,
1 /* # */, 1 /* $ */, 1 /* % */, 1 /* & */, 1 /* ' */,
-1, -1,
1 /* * */, 1 /* + */,
-1,
1 /* - */, 1 /* . */,
-1,
1 /* 0 */, 1 /* 1 */, 1 /* 2 */, 1 /* 3 */, 1 /* 4 */, 1 /* 5 */,
1 /* 6 */, 1 /* 7 */, 1 /* 8 */, 1 /* 9 */,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1 /* ^ */, 1 /* _ */, 1 /* ` */, 1 /* a */, 1 /* b */, 1 /* c */, 1 /* d */,
1 /* e */, 1 /* f */, 1 /* g */, 1 /* h */, 1 /* i */, 1 /* j */, 1 /* k */,
1 /* l */, 1 /* m */, 1 /* n */, 1 /* o */, 1 /* p */, 1 /* q */, 1 /* r */,
1 /* s */, 1 /* t */, 1 /* u */, 1 /* v */, 1 /* w */, 1 /* x */, 1 /* y */,
1 /* z */,
-1,
1 /* | */,
-1,
1 /* ~ */,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
static int check_header_name(const uint8_t *name, size_t len, int nocase)
{
const uint8_t *last;
if(len == 0) {
return 0;
}
if(*name == ':') {
if(len == 1) {
return 0;
}
++name;
--len;
}
for(last = name + len; name != last; ++name) {
if(nocase && 'A' <= *name && *name <= 'Z') continue;
if(VALID_HD_NAME_CHARS[*name] == -1) {
return 0;
}
}
return 1;
}
int nghttp2_check_header_name(const uint8_t *name, size_t len)
{
return check_header_name(name, len, 0);
}
int nghttp2_check_header_name_nocase(const uint8_t *name, size_t len)
{
return check_header_name(name, len, 1);
}
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const char* nghttp2_strerror(int error_code)
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{
switch(error_code) {
case 0:
return "Success";
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case NGHTTP2_ERR_INVALID_ARGUMENT:
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return "Invalid argument";
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case NGHTTP2_ERR_UNSUPPORTED_VERSION:
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return "Unsupported SPDY version";
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case NGHTTP2_ERR_WOULDBLOCK:
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return "Operation would block";
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case NGHTTP2_ERR_PROTO:
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return "Protocol error";
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case NGHTTP2_ERR_INVALID_FRAME:
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return "Invalid frame octets";
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case NGHTTP2_ERR_EOF:
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return "EOF";
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case NGHTTP2_ERR_DEFERRED:
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return "Data transfer deferred";
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case NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE:
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return "No more Stream ID available";
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case NGHTTP2_ERR_STREAM_CLOSED:
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return "Stream was already closed or invalid";
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case NGHTTP2_ERR_STREAM_CLOSING:
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return "Stream is closing";
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case NGHTTP2_ERR_STREAM_SHUT_WR:
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return "The transmission is not allowed for this stream";
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case NGHTTP2_ERR_INVALID_STREAM_ID:
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return "Stream ID is invalid";
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case NGHTTP2_ERR_INVALID_STREAM_STATE:
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return "Invalid stream state";
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case NGHTTP2_ERR_DEFERRED_DATA_EXIST:
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return "Another DATA frame has already been deferred";
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case NGHTTP2_ERR_START_STREAM_NOT_ALLOWED:
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return "request HEADERS is not allowed";
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case NGHTTP2_ERR_GOAWAY_ALREADY_SENT:
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return "GOAWAY has already been sent";
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case NGHTTP2_ERR_INVALID_HEADER_BLOCK:
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return "Invalid header block";
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case NGHTTP2_ERR_INVALID_STATE:
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return "Invalid state";
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case NGHTTP2_ERR_GZIP:
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return "Gzip error";
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case NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE:
return "The user callback function failed due to the temporal error";
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case NGHTTP2_ERR_FRAME_TOO_LARGE:
return "The length of the frame is too large";
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case NGHTTP2_ERR_HEADER_COMP:
return "Header compression/decompression error";
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case NGHTTP2_ERR_NOMEM:
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return "Out of memory";
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case NGHTTP2_ERR_CALLBACK_FAILURE:
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return "The user callback function failed";
default:
return "Unknown error code";
}
}