nghttp2/lib/nghttp2_buf.c

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/*
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* nghttp2 - HTTP/2 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.
*/
#include "nghttp2_buf.h"
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#include <stdio.h>
#include "nghttp2_helper.h"
void nghttp2_buf_init(nghttp2_buf *buf)
{
buf->begin = NULL;
buf->end = NULL;
buf->pos = NULL;
buf->last = NULL;
buf->mark = NULL;
}
int nghttp2_buf_init2(nghttp2_buf *buf, size_t initial)
{
nghttp2_buf_init(buf);
return nghttp2_buf_reserve(buf, initial);
}
void nghttp2_buf_free(nghttp2_buf *buf)
{
free(buf->begin);
}
int nghttp2_buf_reserve(nghttp2_buf *buf, size_t new_cap)
{
uint8_t *ptr;
size_t cap;
cap = nghttp2_buf_cap(buf);
if(cap >= new_cap) {
return 0;
}
new_cap = nghttp2_max(new_cap, cap * 2);
ptr = realloc(buf->begin, new_cap);
if(ptr == NULL) {
return NGHTTP2_ERR_NOMEM;
}
buf->pos = ptr + (buf->pos - buf->begin);
buf->last = ptr + (buf->last - buf->begin);
buf->mark = ptr + (buf->mark - buf->begin);
buf->begin = ptr;
buf->end = ptr + new_cap;
return 0;
}
int nghttp2_buf_pos_reserve(nghttp2_buf *buf, size_t new_rel_cap)
{
return nghttp2_buf_reserve(buf, nghttp2_buf_pos_offset(buf) + new_rel_cap);
}
int nghttp2_buf_last_reserve(nghttp2_buf *buf, size_t new_rel_cap)
{
return nghttp2_buf_reserve(buf, nghttp2_buf_last_offset(buf) + new_rel_cap);
}
void nghttp2_buf_reset(nghttp2_buf *buf)
{
buf->pos = buf->last = buf->mark = buf->begin;
}
void nghttp2_buf_wrap_init(nghttp2_buf *buf, uint8_t *begin, size_t len)
{
buf->begin = buf->pos = buf->last = buf->mark = begin;
buf->end = begin + len;
}
static int buf_chain_new(nghttp2_buf_chain **chain, size_t chunk_length)
{
int rv;
*chain = malloc(sizeof(nghttp2_buf_chain));
if(*chain == NULL) {
return NGHTTP2_ERR_NOMEM;
}
(*chain)->next = NULL;
rv = nghttp2_buf_init2(&(*chain)->buf, chunk_length);
if(rv != 0) {
free(*chain);
return NGHTTP2_ERR_NOMEM;
}
return 0;
}
static void buf_chain_del(nghttp2_buf_chain *chain)
{
nghttp2_buf_free(&chain->buf);
free(chain);
}
int nghttp2_bufs_init(nghttp2_bufs *bufs, size_t chunk_length,
size_t max_chunk)
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{
return nghttp2_bufs_init2(bufs, chunk_length, max_chunk, 0);
}
int nghttp2_bufs_init2(nghttp2_bufs *bufs, size_t chunk_length,
size_t max_chunk, size_t offset)
{
return nghttp2_bufs_init3(bufs, chunk_length, max_chunk, max_chunk, offset);
}
int nghttp2_bufs_init3(nghttp2_bufs *bufs, size_t chunk_length,
size_t max_chunk, size_t chunk_keep, size_t offset)
{
int rv;
nghttp2_buf_chain *chain;
if(chunk_keep == 0 || max_chunk < chunk_keep || chunk_length < offset) {
return NGHTTP2_ERR_INVALID_ARGUMENT;
}
rv = buf_chain_new(&chain, chunk_length);
if(rv != 0) {
return rv;
}
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bufs->offset = offset;
bufs->head = chain;
bufs->cur = bufs->head;
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nghttp2_buf_shift_right(&bufs->cur->buf, offset);
bufs->chunk_length = chunk_length;
bufs->chunk_used = 1;
bufs->max_chunk = max_chunk;
bufs->chunk_keep = chunk_keep;
return 0;
}
void nghttp2_bufs_free(nghttp2_bufs *bufs)
{
nghttp2_buf_chain *chain, *next_chain;
for(chain = bufs->head; chain;) {
next_chain = chain->next;
buf_chain_del(chain);
chain = next_chain;
}
}
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void nghttp2_bufs_seek_last_present(nghttp2_bufs *bufs)
{
nghttp2_buf_chain *ci;
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for(ci = bufs->cur; ci; ci = ci->next) {
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if(nghttp2_buf_len(&ci->buf) == 0) {
return;
} else {
bufs->cur = ci;
}
}
}
ssize_t nghttp2_bufs_len(nghttp2_bufs *bufs)
{
nghttp2_buf_chain *ci;
ssize_t len;
len = 0;
for(ci = bufs->head; ci; ci = ci->next) {
len += nghttp2_buf_len(&ci->buf);
}
return len;
}
static int bufs_avail(nghttp2_bufs *bufs)
{
return nghttp2_buf_avail(&bufs->cur->buf) +
(bufs->chunk_length - bufs->offset) * (bufs->max_chunk - bufs->chunk_used);
}
static int bufs_alloc_chain(nghttp2_bufs *bufs)
{
int rv;
nghttp2_buf_chain *chain;
if(bufs->cur->next) {
bufs->cur = bufs->cur->next;
return 0;
}
if(bufs->max_chunk == bufs->chunk_used) {
return NGHTTP2_ERR_BUFFER_ERROR;
}
rv = buf_chain_new(&chain, bufs->chunk_length);
if(rv != 0) {
return rv;
}
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DEBUGF(fprintf(stderr,
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"new buffer %zu bytes allocated for bufs %p, used %zu\n",
bufs->chunk_length, bufs, bufs->chunk_used));
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++bufs->chunk_used;
bufs->cur->next = chain;
bufs->cur = chain;
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nghttp2_buf_shift_right(&bufs->cur->buf, bufs->offset);
return 0;
}
int nghttp2_bufs_add(nghttp2_bufs *bufs, const void *data, size_t len)
{
int rv;
size_t nwrite;
nghttp2_buf *buf;
const uint8_t *p;
if(bufs_avail(bufs) < (ssize_t)len) {
return NGHTTP2_ERR_BUFFER_ERROR;
}
p = data;
while(len) {
buf = &bufs->cur->buf;
nwrite = nghttp2_min((size_t)nghttp2_buf_avail(buf), len);
if(nwrite == 0) {
rv = bufs_alloc_chain(bufs);
if(rv != 0) {
return rv;
}
continue;
}
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buf->last = nghttp2_cpymem(buf->last, p, nwrite);
p += len;
len -= nwrite;
}
return 0;
}
static int bufs_ensure_addb(nghttp2_bufs *bufs)
{
int rv;
nghttp2_buf *buf;
buf = &bufs->cur->buf;
if(nghttp2_buf_avail(buf) > 0) {
return 0;
}
rv = bufs_alloc_chain(bufs);
if(rv != 0) {
return rv;
}
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return 0;
}
int nghttp2_bufs_addb(nghttp2_bufs *bufs, uint8_t b)
{
int rv;
rv = bufs_ensure_addb(bufs);
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if(rv != 0) {
return rv;
}
*bufs->cur->buf.last++ = b;
return 0;
}
int nghttp2_bufs_addb_hold(nghttp2_bufs *bufs, uint8_t b)
{
int rv;
rv = bufs_ensure_addb(bufs);
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if(rv != 0) {
return rv;
}
*bufs->cur->buf.last = b;
return 0;
}
int nghttp2_bufs_orb(nghttp2_bufs *bufs, uint8_t b)
{
int rv;
rv = bufs_ensure_addb(bufs);
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if(rv != 0) {
return rv;
}
*bufs->cur->buf.last++ |= b;
return 0;
}
int nghttp2_bufs_orb_hold(nghttp2_bufs *bufs, uint8_t b)
{
int rv;
rv = bufs_ensure_addb(bufs);
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if(rv != 0) {
return rv;
}
*bufs->cur->buf.last |= b;
return 0;
}
ssize_t nghttp2_bufs_remove(nghttp2_bufs *bufs, uint8_t **out)
{
size_t len;
nghttp2_buf_chain *chain;
nghttp2_buf *buf;
uint8_t *res;
nghttp2_buf resbuf;
len = 0;
for(chain = bufs->head; chain; chain = chain->next) {
len += nghttp2_buf_len(&chain->buf);
}
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if(!len) {
res = NULL;
} else {
res = malloc(len);
if(res == NULL) {
return NGHTTP2_ERR_NOMEM;
}
}
nghttp2_buf_wrap_init(&resbuf, res, len);
for(chain = bufs->head; chain; chain = chain->next) {
buf = &chain->buf;
if(resbuf.last) {
resbuf.last = nghttp2_cpymem(resbuf.last,
buf->pos, nghttp2_buf_len(buf));
}
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nghttp2_buf_reset(buf);
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nghttp2_buf_shift_right(&chain->buf, bufs->offset);
}
bufs->cur = bufs->head;
*out = res;
return len;
}
void nghttp2_bufs_reset(nghttp2_bufs *bufs)
{
nghttp2_buf_chain *chain, *ci;
size_t k;
k = bufs->chunk_keep;
for(ci = bufs->head; ci; ci = ci->next) {
nghttp2_buf_reset(&ci->buf);
nghttp2_buf_shift_right(&ci->buf, bufs->offset);
if(--k == 0) {
break;
}
}
if(ci) {
chain = ci->next;
ci->next = NULL;
for(ci = chain; ci;) {
chain = ci->next;
buf_chain_del(ci);
ci = chain;
}
bufs->chunk_used = bufs->chunk_keep;
}
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bufs->cur = bufs->head;
}
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int nghttp2_bufs_advance(nghttp2_bufs *bufs)
{
return bufs_alloc_chain(bufs);
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}
int nghttp2_bufs_next_present(nghttp2_bufs *bufs)
{
nghttp2_buf_chain *chain;
chain = bufs->cur->next;
return chain && nghttp2_buf_len(&chain->buf);
}