git/test-sha1.c
Junio C Hamano b57cbbf8a8 test-sha1: test hashing large buffer
test to hash a large buffer in one go is more important than
hashing large amount of data in small fixed chunks.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-24 02:59:20 -07:00

48 lines
815 B
C

#include "cache.h"
int main(int ac, char **av)
{
SHA_CTX ctx;
unsigned char sha1[20];
unsigned bufsz = 8192;
char *buffer;
if (ac == 2)
bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
if (!bufsz)
bufsz = 8192;
while ((buffer = malloc(bufsz)) == NULL) {
fprintf(stderr, "bufsz %u is too big, halving...\n", bufsz);
bufsz /= 2;
if (bufsz < 1024)
die("OOPS");
}
SHA1_Init(&ctx);
while (1) {
ssize_t sz, this_sz;
char *cp = buffer;
unsigned room = bufsz;
this_sz = 0;
while (room) {
sz = xread(0, cp, room);
if (sz == 0)
break;
if (sz < 0)
die("test-sha1: %s", strerror(errno));
this_sz += sz;
cp += sz;
room -= sz;
}
if (this_sz == 0)
break;
SHA1_Update(&ctx, buffer, this_sz);
}
SHA1_Final(sha1, &ctx);
puts(sha1_to_hex(sha1));
exit(0);
}