mirror of
https://github.com/moparisthebest/spdylay
synced 2024-12-22 07:38:52 -05:00
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* Spdylay - SPDY Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "spdylay_buffer.h"
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#include <assert.h>
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#include <string.h>
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void spdylay_buffer_init(spdylay_buffer *buffer, size_t chunk_capacity)
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{
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buffer->root.data = NULL;
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buffer->root.next = NULL;
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buffer->current = &buffer->root;
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buffer->capacity = chunk_capacity;
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buffer->len = 0;
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/*
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* Set last_offset to maximum so that first append adds new buffer
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* buffer.
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*/
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buffer->last_offset = buffer->capacity;
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}
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void spdylay_buffer_free(spdylay_buffer *buffer)
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{
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spdylay_buffer_chunk *p = buffer->root.next;
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while(p) {
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spdylay_buffer_chunk *next = p->next;
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free(p->data);
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free(p);
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p = next;
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}
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}
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int spdylay_buffer_alloc(spdylay_buffer *buffer)
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{
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if(buffer->current->next == NULL) {
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spdylay_buffer_chunk *chunk;
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uint8_t *buf;
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chunk = malloc(sizeof(spdylay_buffer_chunk));
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if(chunk == NULL) {
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return SPDYLAY_ERR_NOMEM;
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}
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buf = malloc(buffer->capacity);
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if(buf == NULL) {
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free(chunk);
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return SPDYLAY_ERR_NOMEM;
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}
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chunk->data = buf;
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chunk->next = NULL;
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buffer->current->next = chunk;
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buffer->current = chunk;
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} else {
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buffer->current = buffer->current->next;
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}
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buffer->len += buffer->capacity-buffer->last_offset;
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buffer->last_offset = 0;
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return 0;
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}
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uint8_t* spdylay_buffer_get(spdylay_buffer *buffer)
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{
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if(buffer->current->data == NULL) {
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return NULL;
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} else {
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return buffer->current->data+buffer->last_offset;
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}
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}
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size_t spdylay_buffer_avail(spdylay_buffer *buffer)
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{
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return buffer->capacity-buffer->last_offset;
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}
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void spdylay_buffer_advance(spdylay_buffer *buffer, size_t amount)
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{
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buffer->last_offset += amount;
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buffer->len += amount;
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assert(buffer->last_offset <= buffer->capacity);
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}
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size_t spdylay_buffer_length(spdylay_buffer *buffer)
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{
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return buffer->len;
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}
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size_t spdylay_buffer_capacity(spdylay_buffer *buffer)
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{
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return buffer->capacity;
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}
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void spdylay_buffer_serialize(spdylay_buffer *buffer, uint8_t *buf)
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{
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spdylay_buffer_chunk *p = buffer->root.next;
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for(; p; p = p->next) {
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size_t len;
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if(p == buffer->current) {
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len = buffer->last_offset;
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} else {
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len = buffer->capacity;
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}
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memcpy(buf, p->data, len);
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buf += len;
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}
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}
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void spdylay_buffer_reset(spdylay_buffer *buffer)
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{
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buffer->current = &buffer->root;
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buffer->len = 0;
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buffer->last_offset = buffer->capacity;
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}
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