fsck: convert init_skiplist to struct object_id

Convert a hardcoded constant buffer size to a use of GIT_MAX_HEXSZ, and
use parse_oid_hex to reduce the dependency on the size of the hash.
This function is a caller of sha1_array_append, which will be converted
later.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fsck.c

@@ -134,8 +134,8 @@ static void init_skiplist(struct fsck_options *options, const char *path)
 {
 	static struct sha1_array skiplist = SHA1_ARRAY_INIT;
 	int sorted, fd;
-	char buffer[41];
-	unsigned char sha1[20];
+	char buffer[GIT_MAX_HEXSZ + 1];
+	struct object_id oid;
 
 	if (options->skiplist)
 		sorted = options->skiplist->sorted;
@@ -148,17 +148,18 @@ static void init_skiplist(struct fsck_options *options, const char *path)
 	if (fd < 0)
 		die("Could not open skip list: %s", path);
 	for (;;) {
+		const char *p;
 		int result = read_in_full(fd, buffer, sizeof(buffer));
 		if (result < 0)
 			die_errno("Could not read '%s'", path);
 		if (!result)
 			break;
-		if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
+		if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 			die("Invalid SHA-1: %s", buffer);
-		sha1_array_append(&skiplist, sha1);
+		sha1_array_append(&skiplist, oid.hash);
 		if (sorted && skiplist.nr > 1 &&
 				hashcmp(skiplist.sha1[skiplist.nr - 2],
-					sha1) > 0)
+					oid.hash) > 0)
 			sorted = 0;
 	}
 	close(fd);