streaming: drop redundant type and size pointers

In the preceding commits we have turned `struct odb_read_stream` into a
publicly visible structure. Furthermore, this structure now contains the
type and size of the object that we are about to stream. Consequently,
the out-pointers that we used before to propagate the type and size of
the streamed object are now somewhat redundant with the data contained
in the structure itself.

Drop these out-pointers and adapt callers accordingly.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

archive-tar.c

@@ -130,12 +130,10 @@ static void write_trailer(void)
 static int stream_blocked(struct repository *r, const struct object_id *oid)
 {
 	struct odb_read_stream *st;
-	enum object_type type;
-	unsigned long sz;
 	char buf[BLOCKSIZE];
 	ssize_t readlen;
 
-	st = odb_read_stream_open(r->objects, oid, &type, &sz, NULL);
+	st = odb_read_stream_open(r->objects, oid, NULL);
 	if (!st)
 		return error(_("cannot stream blob %s"), oid_to_hex(oid));
 	for (;;) {

archive-zip.c

@@ -347,12 +347,11 @@ static int write_zip_entry(struct archiver_args *args,
 			method = ZIP_METHOD_DEFLATE;
 
 		if (!buffer) {
-			enum object_type type;
-			stream = odb_read_stream_open(args->repo->objects, oid,
-						      &type, &size, NULL);
+			stream = odb_read_stream_open(args->repo->objects, oid, NULL);
 			if (!stream)
 				return error(_("cannot stream blob %s"),
 					     oid_to_hex(oid));
+			size = stream->size;
 			flags |= ZIP_STREAM;
 			out = NULL;
 		} else {

builtin/index-pack.c

@@ -798,8 +798,6 @@ static int compare_objects(const unsigned char *buf, unsigned long size,
 static int check_collison(struct object_entry *entry)
 {
 	struct compare_data data;
-	enum object_type type;
-	unsigned long size;
 
 	if (entry->size <= repo_settings_get_big_file_threshold(the_repository) ||
 	    entry->type != OBJ_BLOB)
@@ -807,11 +805,10 @@ static int check_collison(struct object_entry *entry)
 
 	memset(&data, 0, sizeof(data));
 	data.entry = entry;
-	data.st = odb_read_stream_open(the_repository->objects, &entry->idx.oid,
-				       &type, &size, NULL);
+	data.st = odb_read_stream_open(the_repository->objects, &entry->idx.oid, NULL);
 	if (!data.st)
 		return -1;
-	if (size != entry->size || type != entry->type)
+	if (data.st->size != entry->size || data.st->type != entry->type)
 		die(_("SHA1 COLLISION FOUND WITH %s !"),
 		    oid_to_hex(&entry->idx.oid));
 	unpack_data(entry, compare_objects, &data);

builtin/pack-objects.c

@@ -521,9 +521,11 @@ static unsigned long write_no_reuse_object(struct hashfile *f, struct object_ent
 		    oe_size_greater_than(&to_pack, entry,
 					 repo_settings_get_big_file_threshold(the_repository)) &&
 		    (st = odb_read_stream_open(the_repository->objects, &entry->idx.oid,
-					       &type, &size, NULL)) != NULL)
+					       NULL)) != NULL) {
 			buf = NULL;
-		else {
+			type = st->type;
+			size = st->size;
+		} else {
 			buf = odb_read_object(the_repository->objects,
 					      &entry->idx.oid, &type,
 					      &size);

object-file.c

@@ -132,19 +132,17 @@ int check_object_signature(struct repository *r, const struct object_id *oid,
 int stream_object_signature(struct repository *r, const struct object_id *oid)
 {
 	struct object_id real_oid;
-	unsigned long size;
-	enum object_type obj_type;
 	struct odb_read_stream *st;
 	struct git_hash_ctx c;
 	char hdr[MAX_HEADER_LEN];
 	int hdrlen;
 
-	st = odb_read_stream_open(r->objects, oid, &obj_type, &size, NULL);
+	st = odb_read_stream_open(r->objects, oid, NULL);
 	if (!st)
 		return -1;
 
 	/* Generate the header */
-	hdrlen = format_object_header(hdr, sizeof(hdr), obj_type, size);
+	hdrlen = format_object_header(hdr, sizeof(hdr), st->type, st->size);
 
 	/* Sha1.. */
 	r->hash_algo->init_fn(&c);

odb/streaming.c

@@ -214,8 +214,6 @@ ssize_t odb_read_stream_read(struct odb_read_stream *st, void *buf, size_t sz)
 
 struct odb_read_stream *odb_read_stream_open(struct object_database *odb,
 					     const struct object_id *oid,
-					     enum object_type *type,
-					     unsigned long *size,
 					     struct stream_filter *filter)
 {
 	struct odb_read_stream *st;
@@ -235,8 +233,6 @@ struct odb_read_stream *odb_read_stream_open(struct object_database *odb,
 		st = nst;
 	}
 
-	*size = st->size;
-	*type = st->type;
 	return st;
 }
 
@@ -247,18 +243,16 @@ int odb_stream_blob_to_fd(struct object_database *odb,
 			  int can_seek)
 {
 	struct odb_read_stream *st;
-	enum object_type type;
-	unsigned long sz;
 	ssize_t kept = 0;
 	int result = -1;
 
-	st = odb_read_stream_open(odb, oid, &type, &sz, filter);
+	st = odb_read_stream_open(odb, oid, filter);
 	if (!st) {
 		if (filter)
 			free_stream_filter(filter);
 		return result;
 	}
-	if (type != OBJ_BLOB)
+	if (st->type != OBJ_BLOB)
 		goto close_and_exit;
 	for (;;) {
 		char buf[1024 * 16];

odb/streaming.h

@@ -25,16 +25,13 @@ struct odb_read_stream {
 };
 
 /*
- * Create a new object stream for the given object database. Populates the type
- * and size pointers with the object's info. An optional filter can be used to
- * transform the object's content.
+ * Create a new object stream for the given object database. An optional filter
+ * can be used to transform the object's content.
  *
  * Returns the stream on success, a `NULL` pointer otherwise.
  */
 struct odb_read_stream *odb_read_stream_open(struct object_database *odb,
 					     const struct object_id *oid,
-					     enum object_type *type,
-					     unsigned long *size,
 					     struct stream_filter *filter);
 
 /*