nghttp2/lib/nghttp2_buffer.c

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/*
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* nghttp2 - HTTP/2.0 C Library
*
* Copyright (c) 2014 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_buffer.h"
#include <assert.h>
#include <string.h>
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#include "nghttp2_helper.h"
void nghttp2_buffer_init(nghttp2_buffer *buffer, size_t max_capacity)
{
buffer->buf = NULL;
buffer->len = 0;
buffer->capacity = 0;
buffer->max_capacity = max_capacity;
}
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void nghttp2_buffer_free(nghttp2_buffer *buffer)
{
free(buffer->buf);
}
int nghttp2_buffer_reserve(nghttp2_buffer *buffer, size_t len)
{
if(len > buffer->max_capacity) {
return NGHTTP2_ERR_BUFFER_ERROR;
}
if(buffer->capacity < len) {
uint8_t *new_buf;
size_t new_cap = buffer->capacity == 0 ? 8 : buffer->capacity * 3 / 2;
new_cap = nghttp2_min(buffer->max_capacity, nghttp2_max(new_cap, len));
new_buf = realloc(buffer->buf, new_cap);
if(new_buf == NULL) {
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return NGHTTP2_ERR_NOMEM;
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}
buffer->buf = new_buf;
buffer->capacity = new_cap;
}
return 0;
}
int nghttp2_buffer_add(nghttp2_buffer *buffer,
const uint8_t *data, size_t len)
{
int rv;
rv = nghttp2_buffer_reserve(buffer, buffer->len + len);
if(rv != 0) {
return rv;
}
memcpy(buffer->buf + buffer->len, data, len);
buffer->len += len;
return 0;
}
int nghttp2_buffer_add_byte(nghttp2_buffer *buffer, uint8_t b)
{
int rv;
rv = nghttp2_buffer_reserve(buffer, buffer->len + 1);
if(rv != 0) {
return rv;
}
buffer->buf[buffer->len] = b;
++buffer->len;
return 0;
}
void nghttp2_buffer_release(nghttp2_buffer *buffer)
{
buffer->buf = NULL;
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buffer->len = 0;
buffer->capacity = 0;
}