nghttp2/lib/nghttp2_gzip.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_gzip.h"
#include <assert.h>
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int nghttp2_gzip_inflate_new(nghttp2_gzip **inflater_ptr)
{
int rv;
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*inflater_ptr = malloc(sizeof(nghttp2_gzip));
if(*inflater_ptr == NULL) {
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return NGHTTP2_ERR_NOMEM;
}
(*inflater_ptr)->finished = 0;
(*inflater_ptr)->zst.next_in = Z_NULL;
(*inflater_ptr)->zst.avail_in = 0;
(*inflater_ptr)->zst.zalloc = Z_NULL;
(*inflater_ptr)->zst.zfree = Z_NULL;
(*inflater_ptr)->zst.opaque = Z_NULL;
rv = inflateInit2(&(*inflater_ptr)->zst, 47);
if(rv != Z_OK) {
free(*inflater_ptr);
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return NGHTTP2_ERR_GZIP;
}
return 0;
}
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void nghttp2_gzip_inflate_del(nghttp2_gzip *inflater)
{
if(inflater != NULL) {
inflateEnd(&inflater->zst);
free(inflater);
}
}
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int nghttp2_gzip_inflate(nghttp2_gzip *inflater,
uint8_t *out, size_t *outlen_ptr,
const uint8_t *in, size_t *inlen_ptr)
{
int rv;
if(inflater->finished) {
return NGHTTP2_ERR_GZIP;
}
inflater->zst.avail_in = *inlen_ptr;
inflater->zst.next_in = (unsigned char*)in;
inflater->zst.avail_out = *outlen_ptr;
inflater->zst.next_out = out;
rv = inflate(&inflater->zst, Z_NO_FLUSH);
*inlen_ptr -= inflater->zst.avail_in;
*outlen_ptr -= inflater->zst.avail_out;
switch(rv) {
case Z_STREAM_END:
inflater->finished = 1;
case Z_OK:
case Z_BUF_ERROR:
return 0;
case Z_DATA_ERROR:
case Z_STREAM_ERROR:
case Z_NEED_DICT:
case Z_MEM_ERROR:
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return NGHTTP2_ERR_GZIP;
default:
assert(0);
/* We need this for some compilers */
return 0;
}
}