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comparison zlib/uncompr.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents ae3a4bfb450b
children
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68:561a7518be6b 111:04ced10e8804
1 /* uncompr.c -- decompress a memory buffer 1 /* uncompr.c -- decompress a memory buffer
2 * Copyright (C) 1995-2003 Jean-loup Gailly. 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 3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */ 4 */
5 5
6 /* @(#) $Id: uncompr.c,v 1.1.1.2 2002/03/11 21:53:27 tromey Exp $ */ 6 /* @(#) $Id: uncompr.c,v 1.1.1.2 2002/03/11 21:53:27 tromey Exp $ */
7 7
8 #define ZLIB_INTERNAL 8 #define ZLIB_INTERNAL
9 #include "zlib.h" 9 #include "zlib.h"
10 10
11 /* =========================================================================== 11 /* ===========================================================================
12 Decompresses the source buffer into the destination buffer. sourceLen is 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 13 the byte length of the source buffer. Upon entry, *destLen is the total size
14 size of the destination buffer, which must be large enough to hold the 14 of the destination buffer, which must be large enough to hold the entire
15 entire uncompressed data. (The size of the uncompressed data must have 15 uncompressed data. (The size of the uncompressed data must have been saved
16 been saved previously by the compressor and transmitted to the decompressor 16 previously by the compressor and transmitted to the decompressor by some
17 by some mechanism outside the scope of this compression library.) 17 mechanism outside the scope of this compression library.) Upon exit,
18 Upon exit, destLen is the actual size of the compressed buffer. 18 *destLen is the size of the decompressed data and *sourceLen is the number
19 This function can be used to decompress a whole file at once if the 19 of source bytes consumed. Upon return, source + *sourceLen points to the
20 input file is mmap'ed. 20 first unused input byte.
21 21
22 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not 22 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
23 enough memory, Z_BUF_ERROR if there was not enough room in the output 23 memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
24 buffer, or Z_DATA_ERROR if the input data was corrupted. 24 Z_DATA_ERROR if the input data was corrupted, including if the input data is
25 an incomplete zlib stream.
25 */ 26 */
27 int ZEXPORT uncompress2 (dest, destLen, source, sourceLen)
28 Bytef *dest;
29 uLongf *destLen;
30 const Bytef *source;
31 uLong *sourceLen;
32 {
33 z_stream stream;
34 int err;
35 const uInt max = (uInt)-1;
36 uLong len, left;
37 Byte buf[1]; /* for detection of incomplete stream when *destLen == 0 */
38
39 len = *sourceLen;
40 if (*destLen) {
41 left = *destLen;
42 *destLen = 0;
43 }
44 else {
45 left = 1;
46 dest = buf;
47 }
48
49 stream.next_in = (z_const Bytef *)source;
50 stream.avail_in = 0;
51 stream.zalloc = (alloc_func)0;
52 stream.zfree = (free_func)0;
53 stream.opaque = (voidpf)0;
54
55 err = inflateInit(&stream);
56 if (err != Z_OK) return err;
57
58 stream.next_out = dest;
59 stream.avail_out = 0;
60
61 do {
62 if (stream.avail_out == 0) {
63 stream.avail_out = left > (uLong)max ? max : (uInt)left;
64 left -= stream.avail_out;
65 }
66 if (stream.avail_in == 0) {
67 stream.avail_in = len > (uLong)max ? max : (uInt)len;
68 len -= stream.avail_in;
69 }
70 err = inflate(&stream, Z_NO_FLUSH);
71 } while (err == Z_OK);
72
73 *sourceLen -= len + stream.avail_in;
74 if (dest != buf)
75 *destLen = stream.total_out;
76 else if (stream.total_out && err == Z_BUF_ERROR)
77 left = 1;
78
79 inflateEnd(&stream);
80 return err == Z_STREAM_END ? Z_OK :
81 err == Z_NEED_DICT ? Z_DATA_ERROR :
82 err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
83 err;
84 }
85
26 int ZEXPORT uncompress (dest, destLen, source, sourceLen) 86 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
27 Bytef *dest; 87 Bytef *dest;
28 uLongf *destLen; 88 uLongf *destLen;
29 const Bytef *source; 89 const Bytef *source;
30 uLong sourceLen; 90 uLong sourceLen;
31 { 91 {
32 z_stream stream; 92 return uncompress2(dest, destLen, source, &sourceLen);
33 int err;
34
35 stream.next_in = (Bytef*)source;
36 stream.avail_in = (uInt)sourceLen;
37 /* Check for source > 64K on 16-bit machine: */
38 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
39
40 stream.next_out = dest;
41 stream.avail_out = (uInt)*destLen;
42 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
43
44 stream.zalloc = (alloc_func)0;
45 stream.zfree = (free_func)0;
46
47 err = inflateInit(&stream);
48 if (err != Z_OK) return err;
49
50 err = inflate(&stream, Z_FINISH);
51 if (err != Z_STREAM_END) {
52 inflateEnd(&stream);
53 if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
54 return Z_DATA_ERROR;
55 return err;
56 }
57 *destLen = stream.total_out;
58
59 err = inflateEnd(&stream);
60 return err;
61 } 93 }