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>

diff --git a/test-sha1.c b/test-sha1.c
index 80daba980ecd85852ee3a23c155602e4cd1ba07a..e57eae10bf73baac79fd8b95ddb0ff1b4c8c0cd6 100644 (file)
--- a/test-sha1.c
+++ b/test-sha1.c
@@ -5,10 +5,15 @@ 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)
-               bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
+       if (ac == 2) {
+               if (!strcmp(av[1], "-b"))
+                       binary = 1;
+               else
+                       bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
+       }
 
        if (!bufsz)
                bufsz = 8192;
@@ -42,6 +47,10 @@ int main(int ac, char **av)
                git_SHA1_Update(&ctx, buffer, this_sz);
        }
        git_SHA1_Final(sha1, &ctx);
-       puts(sha1_to_hex(sha1));
+
+       if (binary)
+               fwrite(sha1, 1, 20, stdout);
+       else
+               puts(sha1_to_hex(sha1));
        exit(0);
 }