nghttp2/lib/spdylay_zlib.c

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/*
* Spdylay - SPDY 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.
*/
#include "spdylay_zlib.h"
#define COMPRESSION_LEVEL 9
#define WINDOW_BITS 11
#define MEM_LEVEL 1
static const char hd_dict[] =
"optionsgetheadpostputdeletetraceacceptaccept-charsetaccept-encodingaccept-"
"languageauthorizationexpectfromhostif-modified-sinceif-matchif-none-matchi"
"f-rangeif-unmodifiedsincemax-forwardsproxy-authorizationrangerefererteuser"
"-agent10010120020120220320420520630030130230330430530630740040140240340440"
"5406407408409410411412413414415416417500501502503504505accept-rangesageeta"
"glocationproxy-authenticatepublicretry-afterservervarywarningwww-authentic"
"ateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertran"
"sfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locati"
"oncontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMo"
"ndayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSe"
"pOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplic"
"ation/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1"
".1statusversionurl";
int spdylay_zlib_deflate_hd_init(spdylay_zlib *deflater)
{
deflater->zst.next_in = Z_NULL;
deflater->zst.zalloc = Z_NULL;
deflater->zst.zfree = Z_NULL;
deflater->zst.opaque = Z_NULL;
if(Z_OK != deflateInit2(&deflater->zst, COMPRESSION_LEVEL, Z_DEFLATED,
WINDOW_BITS, MEM_LEVEL, Z_DEFAULT_STRATEGY)) {
return SPDYLAY_ERR_ZLIB;
}
if(Z_OK != deflateSetDictionary(&deflater->zst, (uint8_t*)hd_dict,
sizeof(hd_dict))) {
return SPDYLAY_ERR_ZLIB;
}
return 0;
}
int spdylay_zlib_inflate_hd_init(spdylay_zlib *inflater)
{
inflater->zst.next_in = Z_NULL;
inflater->zst.avail_in = 0;
inflater->zst.zalloc = Z_NULL;
inflater->zst.zfree = Z_NULL;
if(Z_OK != inflateInit(&inflater->zst)) {
return SPDYLAY_ERR_ZLIB;
}
return 0;
}
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void spdylay_zlib_deflate_free(spdylay_zlib *deflater)
{
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deflateEnd(&deflater->zst);
}
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void spdylay_zlib_inflate_free(spdylay_zlib *inflater)
{
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inflateEnd(&inflater->zst);
}
ssize_t spdylay_zlib_deflate_hd(spdylay_zlib *deflater,
uint8_t *out, size_t outlen,
const uint8_t *in, size_t inlen)
{
int r;
deflater->zst.avail_in = inlen;
deflater->zst.next_in = (uint8_t*)in;
deflater->zst.avail_out = outlen;
deflater->zst.next_out = out;
r = deflate(&deflater->zst, Z_SYNC_FLUSH);
if(r == Z_OK) {
return outlen-deflater->zst.avail_out;
} else {
return SPDYLAY_ERR_ZLIB;
}
}
size_t spdylay_zlib_deflate_hd_bound(spdylay_zlib *deflater, size_t len)
{
return deflateBound(&deflater->zst, len);
}
ssize_t spdylay_zlib_inflate_hd(spdylay_zlib *inflater,
spdylay_buffer* buf,
const uint8_t *in, size_t inlen)
{
int r;
inflater->zst.avail_in = inlen;
inflater->zst.next_in = (uint8_t*)in;
while(1) {
if(spdylay_buffer_avail(buf) == 0) {
if((r = spdylay_buffer_alloc(buf)) != 0) {
return r;
}
}
inflater->zst.avail_out = spdylay_buffer_avail(buf);
inflater->zst.next_out = spdylay_buffer_get(buf);
r = inflate(&inflater->zst, Z_NO_FLUSH);
if(r == Z_STREAM_ERROR || r == Z_STREAM_END || r == Z_DATA_ERROR) {
return SPDYLAY_ERR_ZLIB;
} else if(r == Z_NEED_DICT) {
if(Z_OK != inflateSetDictionary(&inflater->zst, (uint8_t*)hd_dict,
sizeof(hd_dict))) {
return SPDYLAY_ERR_ZLIB;
}
} else {
if(r == Z_OK) {
size_t adv = spdylay_buffer_avail(buf)-inflater->zst.avail_out;
spdylay_buffer_advance(buf, adv);
}
if(inflater->zst.avail_in == 0 && inflater->zst.avail_out > 0) {
break;
}
}
}
return spdylay_buffer_length(buf);
}