sha1_file: convert check_sha1_signature to struct object_id

Convert this function to take a pointer to struct object_id and rename
it check_object_signature.  Introduce temporaries to convert the return
values of lookup_replace_object and lookup_replace_object_extended into
struct object_id.

The temporaries are needed because in order to convert
lookup_replace_object, open_istream needs to be converted, and
open_istream needs check_sha1_signature to be converted, causing a loop
of dependencies.  The temporaries will be removed in a future patch.

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

builtin/fast-export.c

@@ -240,7 +240,7 @@ static void export_blob(const struct object_id *oid)
 		buf = read_sha1_file(oid->hash, &type, &size);
 		if (!buf)
 			die ("Could not read blob %s", oid_to_hex(oid));
-		if (check_sha1_signature(oid->hash, buf, size, type_name(type)) < 0)
+		if (check_object_signature(oid, buf, size, type_name(type)) < 0)
 			die("sha1 mismatch in blob %s", oid_to_hex(oid));
 		object = parse_object_buffer(oid, type, size, buf, &eaten);
 	}

builtin/index-pack.c

@@ -1377,7 +1377,7 @@ static void fix_unresolved_deltas(struct hashfile *f)
 		if (!base_obj->data)
 			continue;
 
-		if (check_sha1_signature(d->oid.hash, base_obj->data,
+		if (check_object_signature(&d->oid, base_obj->data,
 				base_obj->size, type_name(type)))
 			die(_("local object %s is corrupt"), oid_to_hex(&d->oid));
 		base_obj->obj = append_obj_to_pack(f, d->oid.hash,

builtin/mktag.c

@@ -27,8 +27,11 @@ static int verify_object(const struct object_id *oid, const char *expected_type)
 	const unsigned char *repl = lookup_replace_object(oid->hash);
 
 	if (buffer) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
 		if (type == type_from_string(expected_type))
-			ret = check_sha1_signature(repl, buffer, size, expected_type);
+			ret = check_object_signature(&reploid, buffer, size, expected_type);
 		free(buffer);
 	}
 	return ret;

cache.h

@@ -1236,7 +1236,7 @@ extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
 
-extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
+extern int check_object_signature(const struct object_id *oid, void *buf, unsigned long size, const char *type);
 
 extern int finalize_object_file(const char *tmpfile, const char *filename);
 

object.c

@@ -255,7 +255,10 @@ struct object *parse_object(const struct object_id *oid)
 	if ((obj && obj->type == OBJ_BLOB && has_object_file(oid)) ||
 	    (!obj && has_object_file(oid) &&
 	     sha1_object_info(oid->hash, NULL) == OBJ_BLOB)) {
-		if (check_sha1_signature(repl, NULL, 0, NULL) < 0) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
+		if (check_object_signature(&reploid, NULL, 0, NULL) < 0) {
 			error("sha1 mismatch %s", oid_to_hex(oid));
 			return NULL;
 		}
@@ -265,7 +268,10 @@ struct object *parse_object(const struct object_id *oid)
 
 	buffer = read_sha1_file(oid->hash, &type, &size);
 	if (buffer) {
-		if (check_sha1_signature(repl, buffer, size, type_name(type)) < 0) {
+		struct object_id reploid;
+		hashcpy(reploid.hash, repl);
+
+		if (check_object_signature(&reploid, buffer, size, type_name(type)) < 0) {
 			free(buffer);
 			error("sha1 mismatch %s", sha1_to_hex(repl));
 			return NULL;

pack-check.c

@@ -126,7 +126,7 @@ static int verify_packfile(struct packed_git *p,
 
 		if (type == OBJ_BLOB && big_file_threshold <= size) {
 			/*
-			 * Let check_sha1_signature() check it with
+			 * Let check_object_signature() check it with
 			 * the streaming interface; no point slurping
 			 * the data in-core only to discard.
 			 */
@@ -141,7 +141,7 @@ static int verify_packfile(struct packed_git *p,
 			err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
 				    oid_to_hex(entries[i].oid.oid), p->pack_name,
 				    (uintmax_t)entries[i].offset);
-		else if (check_sha1_signature(entries[i].oid.hash, data, size, type_name(type)))
+		else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type)))
 			err = error("packed %s from %s is corrupt",
 				    oid_to_hex(entries[i].oid.oid), p->pack_name);
 		else if (fn) {

sha1_file.c

@@ -784,8 +784,8 @@ void *xmmap(void *start, size_t length,
  * With "map" == NULL, try reading the object named with "sha1" using
  * the streaming interface and rehash it to do the same.
  */
-int check_sha1_signature(const unsigned char *sha1, void *map,
-			 unsigned long size, const char *type)
+int check_object_signature(const struct object_id *oid, void *map,
+			   unsigned long size, const char *type)
 {
 	struct object_id real_oid;
 	enum object_type obj_type;
@@ -796,10 +796,10 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
 
 	if (map) {
 		hash_object_file(map, size, type, &real_oid);
-		return hashcmp(sha1, real_oid.hash) ? -1 : 0;
+		return oidcmp(oid, &real_oid) ? -1 : 0;
 	}
 
-	st = open_istream(sha1, &obj_type, &size, NULL);
+	st = open_istream(oid->hash, &obj_type, &size, NULL);
 	if (!st)
 		return -1;
 
@@ -823,7 +823,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
 	}
 	the_hash_algo->final_fn(real_oid.hash, &c);
 	close_istream(st);
-	return hashcmp(sha1, real_oid.hash) ? -1 : 0;
+	return oidcmp(oid, &real_oid) ? -1 : 0;
 }
 
 int git_open_cloexec(const char *name, int flags)
@@ -2217,7 +2217,7 @@ int read_loose_object(const char *path,
 			git_inflate_end(&stream);
 			goto out;
 		}
-		if (check_sha1_signature(expected_oid->hash, *contents,
+		if (check_object_signature(expected_oid, *contents,
 					 *size, type_name(*type))) {
 			error("sha1 mismatch for %s (expected %s)", path,
 			      oid_to_hex(expected_oid));