Line | Count | Source (jump to first uncovered line) |
1 | | /* uncompr.c -- decompress a memory buffer |
2 | | * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler |
3 | | * For conditions of distribution and use, see copyright notice in zlib.h |
4 | | */ |
5 | | |
6 | | /* @(#) $Id$ */ |
7 | | |
8 | | #define ZLIB_INTERNAL |
9 | | #include "zlib.h" |
10 | | |
11 | | /* =========================================================================== |
12 | | Decompresses the source buffer into the destination buffer. *sourceLen is |
13 | | the byte length of the source buffer. Upon entry, *destLen is the total size |
14 | | of the destination buffer, which must be large enough to hold the entire |
15 | | uncompressed data. (The size of the uncompressed data must have been saved |
16 | | previously by the compressor and transmitted to the decompressor by some |
17 | | mechanism outside the scope of this compression library.) Upon exit, |
18 | | *destLen is the size of the decompressed data and *sourceLen is the number |
19 | | of source bytes consumed. Upon return, source + *sourceLen points to the |
20 | | first unused input byte. |
21 | | |
22 | | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough |
23 | | memory, Z_BUF_ERROR if there was not enough room in the output buffer, or |
24 | | Z_DATA_ERROR if the input data was corrupted, including if the input data is |
25 | | an incomplete zlib stream. |
26 | | */ |
27 | | int ZEXPORT uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source, |
28 | 5 | uLong *sourceLen) { |
29 | 5 | z_stream stream; |
30 | 5 | int err; |
31 | 5 | const uInt max = (uInt)-1; |
32 | 5 | uLong len, left; |
33 | 5 | Byte buf[1]; /* for detection of incomplete stream when *destLen == 0 */ |
34 | | |
35 | 5 | len = *sourceLen; |
36 | 5 | if (*destLen) { |
37 | 5 | left = *destLen; |
38 | 5 | *destLen = 0; |
39 | 5 | } |
40 | 0 | else { |
41 | 0 | left = 1; |
42 | 0 | dest = buf; |
43 | 0 | } |
44 | | |
45 | 5 | stream.next_in = (z_const Bytef *)source; |
46 | 5 | stream.avail_in = 0; |
47 | 5 | stream.zalloc = (alloc_func)0; |
48 | 5 | stream.zfree = (free_func)0; |
49 | 5 | stream.opaque = (voidpf)0; |
50 | | |
51 | 5 | err = inflateInit(&stream); |
52 | 5 | if (err != Z_OK) return err; |
53 | | |
54 | 5 | stream.next_out = dest; |
55 | 5 | stream.avail_out = 0; |
56 | | |
57 | 5 | do { |
58 | 5 | if (stream.avail_out == 0) { |
59 | 5 | stream.avail_out = left > (uLong)max ? max : (uInt)left; |
60 | 5 | left -= stream.avail_out; |
61 | 5 | } |
62 | 5 | if (stream.avail_in == 0) { |
63 | 5 | stream.avail_in = len > (uLong)max ? max : (uInt)len; |
64 | 5 | len -= stream.avail_in; |
65 | 5 | } |
66 | 5 | err = inflate(&stream, Z_NO_FLUSH); |
67 | 5 | } while (err == Z_OK); |
68 | | |
69 | 5 | *sourceLen -= len + stream.avail_in; |
70 | 5 | if (dest != buf) |
71 | 5 | *destLen = stream.total_out; |
72 | 0 | else if (stream.total_out && err == Z_BUF_ERROR) |
73 | 0 | left = 1; |
74 | | |
75 | 5 | inflateEnd(&stream); |
76 | 5 | return err == Z_STREAM_END ? Z_OK : |
77 | 5 | err == Z_NEED_DICT ? Z_DATA_ERROR : |
78 | 5 | err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR : |
79 | 5 | err; |
80 | 5 | } |
81 | | |
82 | | int ZEXPORT uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, |
83 | 5 | uLong sourceLen) { |
84 | 5 | return uncompress2(dest, destLen, source, &sourceLen); |
85 | 5 | } |