tree-walk: convert tree_entry_extract() to use struct object_id

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

fsck.c

@@ -450,11 +450,11 @@ static int fsck_tree(struct tree *item, struct fsck_options *options)
 	while (desc.size) {
 		unsigned mode;
 		const char *name;
-		const unsigned char *sha1;
+		const struct object_id *oid;
 
-		sha1 = tree_entry_extract(&desc, &name, &mode);
+		oid = tree_entry_extract(&desc, &name, &mode);
 
-		has_null_sha1 |= is_null_sha1(sha1);
+		has_null_sha1 |= is_null_oid(oid);
 		has_full_path |= !!strchr(name, '/');
 		has_empty_name |= !*name;
 		has_dot |= !strcmp(name, ".");

match-trees.c

@@ -131,14 +131,14 @@ static void match_trees(const unsigned char *hash1,
 
 	while (one.size) {
 		const char *path;
-		const unsigned char *elem;
+		const struct object_id *elem;
 		unsigned mode;
 		int score;
 
 		elem = tree_entry_extract(&one, &path, &mode);
 		if (!S_ISDIR(mode))
 			goto next;
-		score = score_trees(elem, hash2);
+		score = score_trees(elem->hash, hash2);
 		if (*best_score < score) {
 			free(*best_match);
 			*best_match = xstrfmt("%s%s", base, path);
@@ -146,7 +146,7 @@ static void match_trees(const unsigned char *hash1,
 		}
 		if (recurse_limit) {
 			char *newbase = xstrfmt("%s%s/", base, path);
-			match_trees(elem, hash2, best_score, best_match,
+			match_trees(elem->hash, hash2, best_score, best_match,
 				    newbase, recurse_limit - 1);
 			free(newbase);
 		}
@@ -191,15 +191,15 @@ static int splice_tree(const unsigned char *hash1,
 	while (desc.size) {
 		const char *name;
 		unsigned mode;
-		const unsigned char *sha1;
+		const struct object_id *oid;
 
-		sha1 = tree_entry_extract(&desc, &name, &mode);
+		oid = tree_entry_extract(&desc, &name, &mode);
 		if (strlen(name) == toplen &&
 		    !memcmp(name, prefix, toplen)) {
 			if (!S_ISDIR(mode))
 				die("entry %s in tree %s is not a tree",
 				    name, sha1_to_hex(hash1));
-			rewrite_here = (unsigned char *) sha1;
+			rewrite_here = (unsigned char *) oid->hash;
 			break;
 		}
 		update_tree_entry(&desc);

tree-diff.c

@@ -183,7 +183,7 @@ static struct combine_diff_path *emit_path(struct combine_diff_path *p,
 
 	if (t) {
 		/* path present in resulting tree */
-		sha1 = tree_entry_extract(t, &path, &mode);
+		sha1 = tree_entry_extract(t, &path, &mode)->hash;
 		pathlen = tree_entry_len(&t->entry);
 		isdir = S_ISDIR(mode);
 	} else {

tree-walk.c

@@ -433,10 +433,10 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 	int namelen = strlen(name);
 	while (t->size) {
 		const char *entry;
-		const unsigned char *sha1;
+		const struct object_id *oid;
 		int entrylen, cmp;
 
-		sha1 = tree_entry_extract(t, &entry, mode);
+		oid = tree_entry_extract(t, &entry, mode);
 		entrylen = tree_entry_len(&t->entry);
 		update_tree_entry(t);
 		if (entrylen > namelen)
@@ -447,7 +447,7 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (cmp < 0)
 			break;
 		if (entrylen == namelen) {
-			hashcpy(result, sha1);
+			hashcpy(result, oid->hash);
 			return 0;
 		}
 		if (name[entrylen] != '/')
@@ -455,10 +455,10 @@ static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char
 		if (!S_ISDIR(*mode))
 			break;
 		if (++entrylen == namelen) {
-			hashcpy(result, sha1);
+			hashcpy(result, oid->hash);
 			return 0;
 		}
-		return get_tree_entry(sha1, name + entrylen, result, mode);
+		return get_tree_entry(oid->hash, name + entrylen, result, mode);
 	}
 	return -1;
 }

tree-walk.h

@@ -13,11 +13,11 @@ struct tree_desc {
 	unsigned int size;
 };
 
-static inline const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
+static inline const struct object_id *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
 {
 	*pathp = desc->entry.path;
 	*modep = desc->entry.mode;
-	return desc->entry.oid->hash;
+	return desc->entry.oid;
 }
 
 static inline int tree_entry_len(const struct name_entry *ne)