pack: move unpack_object_header_buffer()

Signed-off-by: NJonathan Tan <jonathantanmy@google.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

cache.h

@@ -1663,7 +1663,6 @@ extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *)
 
 extern int is_pack_valid(struct packed_git *);
 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
-extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 

packfile.c

@@ -884,3 +884,28 @@ void reprepare_packed_git(void)
 	prepare_packed_git_run_once = 0;
 	prepare_packed_git();
 }
+
+unsigned long unpack_object_header_buffer(const unsigned char *buf,
+		unsigned long len, enum object_type *type, unsigned long *sizep)
+{
+	unsigned shift;
+	unsigned long size, c;
+	unsigned long used = 0;
+
+	c = buf[used++];
+	*type = (c >> 4) & 7;
+	size = c & 15;
+	shift = 4;
+	while (c & 0x80) {
+		if (len <= used || bitsizeof(long) <= shift) {
+			error("bad object header");
+			size = used = 0;
+			break;
+		}
+		c = buf[used++];
+		size += (c & 0x7f) << shift;
+		shift += 7;
+	}
+	*sizep = size;
+	return used;
+}

packfile.h

@@ -62,6 +62,8 @@ extern void close_all_packs(void);
 extern void unuse_pack(struct pack_window **);
 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
 
+extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
+
 extern void release_pack_memory(size_t);
 
 extern int open_packed_git(struct packed_git *p);

sha1_file.c

@@ -915,31 +915,6 @@ void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 	return map_sha1_file_1(NULL, sha1, size);
 }
 
-unsigned long unpack_object_header_buffer(const unsigned char *buf,
-		unsigned long len, enum object_type *type, unsigned long *sizep)
-{
-	unsigned shift;
-	unsigned long size, c;
-	unsigned long used = 0;
-
-	c = buf[used++];
-	*type = (c >> 4) & 7;
-	size = c & 15;
-	shift = 4;
-	while (c & 0x80) {
-		if (len <= used || bitsizeof(long) <= shift) {
-			error("bad object header");
-			size = used = 0;
-			break;
-		}
-		c = buf[used++];
-		size += (c & 0x7f) << shift;
-		shift += 7;
-	}
-	*sizep = size;
-	return used;
-}
-
 static int unpack_sha1_short_header(git_zstream *stream,
 				    unsigned char *map, unsigned long mapsize,
 				    void *buffer, unsigned long bufsiz)