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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>
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commit b57cbbf8a8630b6d75c885348dc79b8b8cb96c2e 1 parent b65bc21
Junio C Hamano authored
Showing with 32 additions and 9 deletions.
  1. +31 −8 test-sha1.c
  2. +1 −1  test-sha1.sh
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39 test-sha1.c
@@ -4,21 +4,44 @@ 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;
- char buffer[8192];
- sz = xread(0, buffer, sizeof(buffer));
- if (sz == 0)
+ 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;
- if (sz < 0)
- die("test-sha1: %s", strerror(errno));
- SHA1_Update(&ctx, buffer, sz);
+ SHA1_Update(&ctx, buffer, this_sz);
}
SHA1_Final(sha1, &ctx);
puts(sha1_to_hex(sha1));
exit(0);
}
-
View
2  test-sha1.sh
@@ -11,7 +11,7 @@ do
test -z "$pfx" || echo "$pfx"
dd if=/dev/zero bs=1048576 count=$cnt 2>/dev/null |
tr '[\0]' '[g]'
- } | ./test-sha1
+ } | ./test-sha1 $cnt
`
if test "$expect" = "$actual"
then
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