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

[brian m. carlson]

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 <sand...@crustytoothpaste.net>
---
 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;