[PATCH v2 35/42] sha1_file: convert cached object code to struct object_id

["brian m. carlson" <sandals@xxxxxxxxxxxxxxxxxxxx>]

Convert the code that looks up cached objects to use struct object_id.
Adjust the lookup for empty trees to use the_hash_algo.  Note that we
don't need to be concerned about the hard-coded object ID in the
empty_tree object since we never use it.

Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
 sha1-file.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sha1-file.c b/sha1-file.c
index 11598b43eb..4acbf8ee08 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -119,7 +119,7 @@ const char *empty_blob_oid_hex(void)
  * application).
  */
 static struct cached_object {
-	unsigned char sha1[20];
+	struct object_id oid;
 	enum object_type type;
 	void *buf;
 	unsigned long size;
@@ -127,22 +127,22 @@ static struct cached_object {
 static int cached_object_nr, cached_object_alloc;
 
 static struct cached_object empty_tree = {
-	EMPTY_TREE_SHA1_BIN_LITERAL,
+	{ EMPTY_TREE_SHA1_BIN_LITERAL },
 	OBJ_TREE,
 	"",
 	0
 };
 
-static struct cached_object *find_cached_object(const unsigned char *sha1)
+static struct cached_object *find_cached_object(const struct object_id *oid)
 {
 	int i;
 	struct cached_object *co = cached_objects;
 
 	for (i = 0; i < cached_object_nr; i++, co++) {
-		if (!hashcmp(co->sha1, sha1))
+		if (!oidcmp(&co->oid, oid))
 			return co;
 	}
-	if (!hashcmp(sha1, empty_tree.sha1))
+	if (!oidcmp(oid, the_hash_algo->empty_tree))
 		return &empty_tree;
 	return NULL;
 }
@@ -1260,7 +1260,7 @@ int oid_object_info_extended(const struct object_id *oid, struct object_info *oi
 		oi = &blank_oi;
 
 	if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
-		struct cached_object *co = find_cached_object(real->hash);
+		struct cached_object *co = find_cached_object(real);
 		if (co) {
 			if (oi->typep)
 				*(oi->typep) = co->type;
@@ -1369,7 +1369,7 @@ int pretend_object_file(void *buf, unsigned long len, enum object_type type,
 	struct cached_object *co;
 
 	hash_object_file(buf, len, type_name(type), oid);
-	if (has_sha1_file(oid->hash) || find_cached_object(oid->hash))
+	if (has_sha1_file(oid->hash) || find_cached_object(oid))
 		return 0;
 	ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
 	co = &cached_objects[cached_object_nr++];
@@ -1377,7 +1377,7 @@ int pretend_object_file(void *buf, unsigned long len, enum object_type type,
 	co->type = type;
 	co->buf = xmalloc(len);
 	memcpy(co->buf, buf, len);
-	hashcpy(co->sha1, oid->hash);
+	oidcpy(&co->oid, oid);
 	return 0;
 }