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Use adler32() from zlib instead of defining our own.

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Since we already depend on zlib, we don't need to define our
own adler32().  Spotted by oprofile.

Signed-off-by: Peter Eriksen <s022018@student.dtu.dk>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Peter Eriksen 2006-02-04 23:54:01 +01:00 committed by Junio C Hamano
parent 9523a4c2fc
commit 04fe2a1706
1 changed files with 1 additions and 38 deletions
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39
diff-delta.c
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@ -20,6 +20,7 @@
#include <stdlib.h>
#include "delta.h"
#include "zlib.h"
/* block size: min = 16, max = 64k, power of 2 */
@ -30,44 +31,6 @@
#define GR_PRIME 0x9e370001
#define HASH(v, b) (((unsigned int)(v) * GR_PRIME) >> (32 - (b)))
/* largest prime smaller than 65536 */
#define BASE 65521
/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
#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);
static unsigned int adler32(unsigned int adler, const unsigned char *buf, int len)
{
int k;
unsigned int s1 = adler & 0xffff;
unsigned int s2 = adler >> 16;
while (len > 0) {
k = MIN(len, NMAX);
len -= k;
while (k >= 16) {
DO16(buf);
buf += 16;
k -= 16;
}
if (k != 0)
do {
s1 += *buf++;
s2 += s1;
} while (--k);
s1 %= BASE;
s2 %= BASE;
}
return (s2 << 16) | s1;
}
static unsigned int hashbits(unsigned int size)
{
unsigned int val = 1, bits = 0;