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compress.c
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1 /* compress.c -- compress a memory buffer
2  * Copyright (C) 1995-2005, 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  Compresses the source buffer into the destination buffer. The level
13  parameter has the same meaning as in deflateInit. sourceLen is the byte
14  length of the source buffer. Upon entry, destLen is the total size of the
15  destination buffer, which must be at least 0.1% larger than sourceLen plus
16  12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
17 
18  compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
19  memory, Z_BUF_ERROR if there was not enough room in the output buffer,
20  Z_STREAM_ERROR if the level parameter is invalid.
21 */
22 int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
23  Bytef *dest;
24  uLongf *destLen;
25  const Bytef *source;
26  uLong sourceLen;
27  int level;
28 {
30  int err;
31  const uInt max = (uInt)-1;
32  uLong left;
33 
34  left = *destLen;
35  *destLen = 0;
36 
37  stream.zalloc = (alloc_func)0;
38  stream.zfree = (free_func)0;
39  stream.opaque = (voidpf)0;
40 
42  if (err != Z_OK) return err;
43 
44  stream.next_out = dest;
45  stream.avail_out = 0;
46  stream.next_in = (z_const Bytef *)source;
47  stream.avail_in = 0;
48 
49  do {
50  if (stream.avail_out == 0) {
51  stream.avail_out = left > (uLong)max ? max : (uInt)left;
52  left -= stream.avail_out;
53  }
54  if (stream.avail_in == 0) {
55  stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
56  sourceLen -= stream.avail_in;
57  }
58  err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
59  } while (err == Z_OK);
60 
61  *destLen = stream.total_out;
63  return err == Z_STREAM_END ? Z_OK : err;
64 }
65 
66 /* ===========================================================================
67  */
68 int ZEXPORT compress (dest, destLen, source, sourceLen)
69  Bytef *dest;
70  uLongf *destLen;
71  const Bytef *source;
72  uLong sourceLen;
73 {
74  return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
75 }
76 
77 /* ===========================================================================
78  If the default memLevel or windowBits for deflateInit() is changed, then
79  this function needs to be updated.
80  */
82  uLong sourceLen;
83 {
84  return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
85  (sourceLen >> 25) + 13;
86 }
int level
Definition: afm2pl.c:1694
int source[257]
Definition: afm2tfm.c:928
#define ZEXPORT(x)
Definition: ftzconf.h:202
unsigned int uInt
Definition: ftzconf.h:221
Byte * voidpf
Definition: ftzconf.h:239
Byte Bytef
Definition: ftzconf.h:228
unsigned long uLong
Definition: ftzconf.h:222
uLong uLongf
Definition: ftzconf.h:233
void(* free_func)()
Definition: zlib.h:64
voidpf(* alloc_func)()
Definition: zlib.h:63
#define Z_STREAM_END
Definition: zlib.h:133
#define Z_FINISH
Definition: zlib.h:129
#define Z_OK
Definition: zlib.h:132
#define Z_NO_FLUSH
Definition: zlib.h:125
#define deflateInit(strm, level)
Definition: zlib.h:815
#define Z_DEFAULT_COMPRESSION
Definition: zlib.h:148
int compress2(Bytef *dest, uLongf *destLen, Bytef *source, uLong sourceLen, int level)
Definition: compress.c:22
int compress(Bytef *dest, uLongf *destLen, Bytef *source, uLong sourceLen)
Definition: compress.c:68
uLong compressBound(uLong sourceLen)
Definition: compress.c:81
int deflate(z_streamp strm, int flush)
Definition: deflate.c:763
int deflateEnd(z_streamp strm)
Definition: deflate.c:1076
#define z_const
Definition: zconf.h:237
#define dest
@ err
Definition: mtxline.h:24
#define max(a, b)
Definition: pbmto4425.c:11
struct stream_s stream
Definition: pts_fax.h:93
#define uInt
#define uLong
lft_cell * left
Definition: routines.h:73
Definition: sh.h:1345