git/test-sha1.c
Jeff King 54c93cb4af test-sha1: add a binary output mode
The test-sha1 helper program will run our internal sha1
routines over its input and output the 40-byte hex sha1.
Sometimes, however, it is useful to have the binary 20-byte
sha1 (and it's a pain to convert back in the shell). Let's
add a "-b" option to output the binary version.

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-22 16:39:46 -07:00

57 lines
941 B
C

#include "cache.h"
int main(int ac, char **av)
{
git_SHA_CTX ctx;
unsigned char sha1[20];
unsigned bufsz = 8192;
int binary = 0;
char *buffer;
if (ac == 2) {
if (!strcmp(av[1], "-b"))
binary = 1;
else
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");
}
git_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_errno("test-sha1");
this_sz += sz;
cp += sz;
room -= sz;
}
if (this_sz == 0)
break;
git_SHA1_Update(&ctx, buffer, this_sz);
}
git_SHA1_Final(sha1, &ctx);
if (binary)
fwrite(sha1, 1, 20, stdout);
else
puts(sha1_to_hex(sha1));
exit(0);
}