[PATCH v2 17/53] tag: convert parse_tag_buffer to struct object_id

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

Specify some constants in terms of GIT_SHA1_HEXSZ, and convert a
get_sha1_hex into parse_oid_hex to avoid needing to specify additional
constants.

Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
 tag.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/tag.c b/tag.c
index 243d1fdbb..625f5cd71 100644
--- a/tag.c
+++ b/tag.c
@@ -116,7 +116,7 @@ static unsigned long parse_tag_date(const char *buf, const char *tail)
 
 int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 {
-	unsigned char sha1[20];
+	struct object_id oid;
 	char type[20];
 	const char *bufptr = data;
 	const char *tail = bufptr + size;
@@ -126,11 +126,10 @@ int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 		return 0;
 	item->object.parsed = 1;
 
-	if (size < 64)
+	if (size < GIT_SHA1_HEXSZ + 24)
 		return -1;
-	if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n')
+	if (memcmp("object ", bufptr, 7) || parse_oid_hex(bufptr + 7, &oid, &bufptr) || *bufptr++ != '\n')
 		return -1;
-	bufptr += 48; /* "object " + sha1 + "\n" */
 
 	if (!starts_with(bufptr, "type "))
 		return -1;
@@ -143,13 +142,13 @@ int parse_tag_buffer(struct tag *item, const void *data, unsigned long size)
 	bufptr = nl + 1;
 
 	if (!strcmp(type, blob_type)) {
-		item->tagged = &lookup_blob(sha1)->object;
+		item->tagged = &lookup_blob(oid.hash)->object;
 	} else if (!strcmp(type, tree_type)) {
-		item->tagged = &lookup_tree(sha1)->object;
+		item->tagged = &lookup_tree(oid.hash)->object;
 	} else if (!strcmp(type, commit_type)) {
-		item->tagged = &lookup_commit(sha1)->object;
+		item->tagged = &lookup_commit(oid.hash)->object;
 	} else if (!strcmp(type, tag_type)) {
-		item->tagged = &lookup_tag(sha1)->object;
+		item->tagged = &lookup_tag(oid.hash)->object;
 	} else {
 		error("Unknown type %s", type);
 		item->tagged = NULL;