[PATCH v2 04/10] object-file.c: take type id, not string, in read_object_with_reference()

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Make the read_object_with_reference() function take "enum object_type"
instead of a "const char *" with a type name that it converted via
type_from_string().

Out of the nine callers of this function, only one wanted to pass a
"const char *". The others were simply passing along the
{commit,tree}_type string constants.

That one caller in builtin/cat-file.c did not expect to pass a "raw"
type (i.e. in invalid "--literally" type, but one gotten from
type_from_string(). Furthermore the read_object_with_reference()
function itself was calling type_from_string(), so this whole thing
amounted to unnecessarily going back and forth.

This API design dates back to f4913f91a96 ([PATCH] Accept commit in
some places when tree is needed., 2005-04-20). At that time there
wasn't an API like type_from_string(). That only arrived in
df8436622fb (formalize typename(), and add its reverse
type_from_string(), 2007-02-26).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/cat-file.c     | 7 ++++---
 builtin/fast-import.c  | 6 +++---
 builtin/grep.c         | 4 ++--
 builtin/pack-objects.c | 2 +-
 cache.h                | 2 +-
 object-file.c          | 7 +++----
 tree-walk.c            | 6 +++---
 7 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 5ebf13359e..46fc7a32ba 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -66,7 +66,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 			int unknown_type)
 {
 	struct object_id oid;
-	enum object_type type;
+	enum object_type type, exp_type_id;
 	char *buf;
 	unsigned long size;
 	struct object_context obj_context;
@@ -154,7 +154,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 		break;
 
 	case 0:
-		if (type_from_string(exp_type) == OBJ_BLOB) {
+		exp_type_id = type_from_string(exp_type);
+		if (exp_type_id == OBJ_BLOB) {
 			struct object_id blob_oid;
 			if (oid_object_info(the_repository, &oid, NULL) == OBJ_TAG) {
 				char *buffer = read_object_file(&oid, &type,
@@ -177,7 +178,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name,
 			 */
 		}
 		buf = read_object_with_reference(the_repository,
-						 &oid, exp_type, &size, NULL);
+						 &oid, exp_type_id, &size, NULL);
 		break;
 
 	default:
diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 3afa81cf9a..ee52be02f8 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -2481,7 +2481,7 @@ static void note_change_n(const char *p, struct branch *b, unsigned char *old_fa
 		unsigned long size;
 		char *buf = read_object_with_reference(the_repository,
 						       &commit_oid,
-						       commit_type, &size,
+						       OBJ_COMMIT, &size,
 						       &commit_oid);
 		if (!buf || size < the_hash_algo->hexsz + 6)
 			die("Not a valid commit: %s", p);
@@ -2553,7 +2553,7 @@ static void parse_from_existing(struct branch *b)
 		char *buf;
 
 		buf = read_object_with_reference(the_repository,
-						 &b->oid, commit_type, &size,
+						 &b->oid, OBJ_COMMIT, &size,
 						 &b->oid);
 		parse_from_commit(b, buf, size);
 		free(buf);
@@ -2649,7 +2649,7 @@ static struct hash_list *parse_merge(unsigned int *count)
 			unsigned long size;
 			char *buf = read_object_with_reference(the_repository,
 							       &n->oid,
-							       commit_type,
+							       OBJ_COMMIT,
 							       &size, &n->oid);
 			if (!buf || size < the_hash_algo->hexsz + 6)
 				die("Not a valid commit: %s", from);
diff --git a/builtin/grep.c b/builtin/grep.c
index 5de725f904..f2a73c92fa 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -467,7 +467,7 @@ static int grep_submodule(struct grep_opt *opt,
 		object = parse_object_or_die(oid, NULL);
 		obj_read_unlock();
 		data = read_object_with_reference(&subrepo,
-						  &object->oid, tree_type,
+						  &object->oid, OBJ_TREE,
 						  &size, NULL);
 		if (!data)
 			die(_("unable to read tree (%s)"), oid_to_hex(&object->oid));
@@ -635,7 +635,7 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 		int hit, len;
 
 		data = read_object_with_reference(opt->repo,
-						  &obj->oid, tree_type,
+						  &obj->oid, OBJ_TREE,
 						  &size, NULL);
 		if (!data)
 			die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index a1e33d7507..feb0320371 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1649,7 +1649,7 @@ static void add_preferred_base(struct object_id *oid)
 		return;
 
 	data = read_object_with_reference(the_repository, oid,
-					  tree_type, &size, &tree_oid);
+					  OBJ_TREE, &size, &tree_oid);
 	if (!data)
 		return;
 
diff --git a/cache.h b/cache.h
index 148d9ab5f1..dad9792c74 100644
--- a/cache.h
+++ b/cache.h
@@ -1508,7 +1508,7 @@ int cache_name_stage_compare(const char *name1, int len1, int stage1, const char
 
 void *read_object_with_reference(struct repository *r,
 				 const struct object_id *oid,
-				 const char *required_type,
+				 enum object_type object_type,
 				 unsigned long *size,
 				 struct object_id *oid_ret);
 
diff --git a/object-file.c b/object-file.c
index 624af408cd..d2f223dcef 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1669,25 +1669,24 @@ void *read_object_file_extended(struct repository *r,
 
 void *read_object_with_reference(struct repository *r,
 				 const struct object_id *oid,
-				 const char *required_type_name,
+				 enum object_type object_type,
 				 unsigned long *size,
 				 struct object_id *actual_oid_return)
 {
-	enum object_type type, required_type;
 	void *buffer;
 	unsigned long isize;
 	struct object_id actual_oid;
 
-	required_type = type_from_string(required_type_name);
 	oidcpy(&actual_oid, oid);
 	while (1) {
 		int ref_length = -1;
 		const char *ref_type = NULL;
+		enum object_type type;
 
 		buffer = repo_read_object_file(r, &actual_oid, &type, &isize);
 		if (!buffer)
 			return NULL;
-		if (type == required_type) {
+		if (type == object_type) {
 			*size = isize;
 			if (actual_oid_return)
 				oidcpy(actual_oid_return, &actual_oid);
diff --git a/tree-walk.c b/tree-walk.c
index 2d6226d5f1..e5db9291e1 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -89,7 +89,7 @@ void *fill_tree_descriptor(struct repository *r,
 	void *buf = NULL;
 
 	if (oid) {
-		buf = read_object_with_reference(r, oid, tree_type, &size, NULL);
+		buf = read_object_with_reference(r, oid, OBJ_TREE, &size, NULL);
 		if (!buf)
 			die("unable to read tree %s", oid_to_hex(oid));
 	}
@@ -605,7 +605,7 @@ int get_tree_entry(struct repository *r,
 	unsigned long size;
 	struct object_id root;
 
-	tree = read_object_with_reference(r, tree_oid, tree_type, &size, &root);
+	tree = read_object_with_reference(r, tree_oid, OBJ_TREE, &size, &root);
 	if (!tree)
 		return -1;
 
@@ -677,7 +677,7 @@ enum get_oid_result get_tree_entry_follow_symlinks(struct repository *r,
 			unsigned long size;
 			tree = read_object_with_reference(r,
 							  &current_tree_oid,
-							  tree_type, &size,
+							  OBJ_TREE, &size,
 							  &root);
 			if (!tree)
 				goto done;
-- 
2.31.1.723.ga5d7868e4a