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adler32.c File Reference
#include "zlib.h"
Include dependency graph for adler32.c:

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Macros

#define BASE   65521L /* largest prime smaller than 65536 */
 
#define NMAX   5552
 
#define DO1(buf, i)   {s1 += buf[i]; s2 += s1;}
 
#define DO2(buf, i)   DO1(buf,i); DO1(buf,i+1);
 
#define DO4(buf, i)   DO2(buf,i); DO2(buf,i+2);
 
#define DO8(buf, i)   DO4(buf,i); DO4(buf,i+4);
 
#define DO16(buf)   DO8(buf,0); DO8(buf,8);
 

Functions

 ZEXPORT (uLong)
 

Macro Definition Documentation

◆ BASE

#define BASE   65521L /* largest prime smaller than 65536 */

Definition at line 10 of file adler32.c.

◆ DO1

#define DO1 (   buf,
  i 
)    {s1 += buf[i]; s2 += s1;}

Definition at line 14 of file adler32.c.

◆ DO16

#define DO16 (   buf)    DO8(buf,0); DO8(buf,8);

Definition at line 18 of file adler32.c.

◆ DO2

#define DO2 (   buf,
  i 
)    DO1(buf,i); DO1(buf,i+1);

Definition at line 15 of file adler32.c.

◆ DO4

#define DO4 (   buf,
  i 
)    DO2(buf,i); DO2(buf,i+2);

Definition at line 16 of file adler32.c.

◆ DO8

#define DO8 (   buf,
  i 
)    DO4(buf,i); DO4(buf,i+4);

Definition at line 17 of file adler32.c.

◆ NMAX

#define NMAX   5552

Definition at line 11 of file adler32.c.

Function Documentation

◆ ZEXPORT()

ZEXPORT ( uLong  )

Definition at line 21 of file adler32.c.

25 {
26  unsigned long s1 = adler & 0xffff;
27  unsigned long s2 = (adler >> 16) & 0xffff;
28  int k;
29 
30  if (buf == Z_NULL) return 1L;
31 
32  while (len > 0) {
33  k = len < NMAX ? len : NMAX;
34  len -= k;
35  while (k >= 16) {
36  DO16(buf);
37  buf += 16;
38  k -= 16;
39  }
40  if (k != 0) do {
41  s1 += *buf++;
42  s2 += s1;
43  } while (--k);
44  s1 %= BASE;
45  s2 %= BASE;
46  }
47  return (s2 << 16) | s1;
48 }
struct S2 s2
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
#define DO16(buf)
Definition: adler32.c:18
#define NMAX
Definition: adler32.c:11
struct S1 s1
#define BASE
Definition: adler32.c:10
static const WCHAR L[]
Definition: oid.c:1250
GLenum GLsizei len
Definition: glext.h:6722
#define Z_NULL
Definition: zlib.h:212
int k
Definition: mpi.c:3369