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1 /*
2  * nghttp2 - HTTP/2 C Library
3  *
4  * Copyright (c) 2012 Tatsuhiro Tsujikawa
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining
7  * a copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sublicense, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be
15  * included in all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24  */
25 #include "nghttp2_gzip.h"
26 
27 #include <assert.h>
28 
nghttp2_gzip_inflate_new(nghttp2_gzip ** inflater_ptr)29 int nghttp2_gzip_inflate_new(nghttp2_gzip **inflater_ptr) {
30   int rv;
31   *inflater_ptr = calloc(1, sizeof(nghttp2_gzip));
32   if (*inflater_ptr == NULL) {
33     return -1;
34   }
35   rv = inflateInit2(&(*inflater_ptr)->zst, 47);
36   if (rv != Z_OK) {
37     free(*inflater_ptr);
38     return -1;
39   }
40   return 0;
41 }
42 
nghttp2_gzip_inflate_del(nghttp2_gzip * inflater)43 void nghttp2_gzip_inflate_del(nghttp2_gzip *inflater) {
44   if (inflater != NULL) {
45     inflateEnd(&inflater->zst);
46     free(inflater);
47   }
48 }
49 
nghttp2_gzip_inflate(nghttp2_gzip * inflater,uint8_t * out,size_t * outlen_ptr,const uint8_t * in,size_t * inlen_ptr)50 int nghttp2_gzip_inflate(nghttp2_gzip *inflater, uint8_t *out,
51                          size_t *outlen_ptr, const uint8_t *in,
52                          size_t *inlen_ptr) {
53   int rv;
54   if (inflater->finished) {
55     return -1;
56   }
57   inflater->zst.avail_in = (unsigned int)*inlen_ptr;
58   inflater->zst.next_in = (unsigned char *)in;
59   inflater->zst.avail_out = (unsigned int)*outlen_ptr;
60   inflater->zst.next_out = out;
61 
62   rv = inflate(&inflater->zst, Z_NO_FLUSH);
63 
64   *inlen_ptr -= inflater->zst.avail_in;
65   *outlen_ptr -= inflater->zst.avail_out;
66   switch (rv) {
67   case Z_STREAM_END:
68     inflater->finished = 1;
69   /* FALL THROUGH */
70   case Z_OK:
71   case Z_BUF_ERROR:
72     return 0;
73   case Z_DATA_ERROR:
74   case Z_STREAM_ERROR:
75   case Z_NEED_DICT:
76   case Z_MEM_ERROR:
77     return -1;
78   default:
79     assert(0);
80     /* We need this for some compilers */
81     return 0;
82   }
83 }
84 
nghttp2_gzip_inflate_finished(nghttp2_gzip * inflater)85 int nghttp2_gzip_inflate_finished(nghttp2_gzip *inflater) {
86   return inflater->finished;
87 }
88