#include "rsync.h"
-int csum_length=SUM_LENGTH;
+int csum_length=2; /* initial value */
#define CSUM_CHUNK 64
a simple 32 bit checksum that can be upadted from either end
(inspired by Mark Adler's Adler-32 checksum)
*/
-uint32 get_checksum1(char *buf,int len)
+uint32 get_checksum1(char *buf1,int len)
{
int i;
uint32 s1, s2;
+ signed char *buf = (signed char *)buf1;
s1 = s2 = 0;
for (i = 0; i < (len-4); i+=4) {
- s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3];
- s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3]);
+ s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3] +
+ 10*CHAR_OFFSET;
+ s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3] + 4*CHAR_OFFSET);
}
for (; i < len; i++) {
- s1 += buf[i]; s2 += s1;
+ s1 += (buf[i]+CHAR_OFFSET); s2 += s1;
}
return (s1 & 0xffff) + (s2 << 16);
}