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compress.c File Reference
#include "zlib.h"
Include dependency graph for compress.c:

Go to the source code of this file.

Macros

#define ZLIB_INTERNAL
 

Functions

int ZEXPORT compress2 (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
 
int ZEXPORT compress (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
 
uLong ZEXPORT compressBound (uLong sourceLen)
 

Macro Definition Documentation

◆ ZLIB_INTERNAL

#define ZLIB_INTERNAL

Definition at line 8 of file compress.c.

Function Documentation

◆ compress()

int ZEXPORT compress ( Bytef dest,
uLongf destLen,
const Bytef source,
uLong  sourceLen 
)

Definition at line 68 of file compress.c.

73 {
74  return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
75 }
int ZEXPORT compress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
Definition: compress.c:22
#define Z_DEFAULT_COMPRESSION
Definition: zlib.h:193
static char * dest
Definition: rtl.c:135

Referenced by add_file(), isCCITTCompression(), main(), parseAndPrintFile(), process_bitmap_updates(), TIFFRGBAImageBegin(), write_file2(), and zero_data().

◆ compress2()

int ZEXPORT compress2 ( Bytef dest,
uLongf destLen,
const Bytef source,
uLong  sourceLen,
int  level 
)

Definition at line 22 of file compress.c.

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 }
GLint level
Definition: gl.h:1546
#define max(a, b)
Definition: svc.c:63
int ZEXPORT deflateEnd(z_streamp strm)
Definition: deflate.c:1079
#define deflateInit(strm, level)
Definition: zlib.h:1793
#define Z_STREAM_END
Definition: zlib.h:178
#define z_const
Definition: zconf.h:237
Byte FAR Bytef
Definition: zconf.h:400
#define Z_OK
Definition: zlib.h:177
unsigned long uLong
Definition: zconf.h:394
GLint left
Definition: glext.h:7726
#define Z_NO_FLUSH
Definition: zlib.h:168
Definition: parse.h:22
GLuint GLuint stream
Definition: glext.h:7522
int ZEXPORT deflate(z_streamp strm, int flush)
Definition: deflate.c:766
#define err(...)
Byte FAR * voidpf
Definition: zconf.h:413
#define Z_FINISH
Definition: zlib.h:172
static char * dest
Definition: rtl.c:135
unsigned int uInt
Definition: zconf.h:393

Referenced by compress().

◆ compressBound()

uLong ZEXPORT compressBound ( uLong  sourceLen)

Definition at line 81 of file compress.c.

83 {
84  return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
85  (sourceLen >> 25) + 13;
86 }