From 54dab52ae8518da67e271b5b3a1f91af1fd5e314 Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Mon, 16 Apr 2007 12:31:56 -0400
Subject: [PATCH] add get_size_from_delta()
... which consists of existing code split out of packed_delta_info()
for other callers to use it as well.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
cache.h | 1 +
sha1_file.c | 73 ++++++++++++++++++++++++++++-------------------------
2 files changed, 40 insertions(+), 34 deletions(-)
diff --git a/cache.h b/cache.h
index 5b67f4c989..63399c7c6b 100644
--- a/cache.h
+++ b/cache.h
@@ -436,6 +436,7 @@ extern const unsigned char *nth_packed_object_sha1(const struct packed_git *, ui
extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
extern unsigned long unpack_object_header_gently(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 const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
/* Dumb servers support */
diff --git a/sha1_file.c b/sha1_file.c
index 0be9737bd1..5dac4666b6 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1160,6 +1160,43 @@ static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type
return unpack_sha1_rest(&stream, hdr, *size, sha1);
}
+unsigned long get_size_from_delta(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos)
+{
+ const unsigned char *data;
+ unsigned char delta_head[20], *in;
+ z_stream stream;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = delta_head;
+ stream.avail_out = sizeof(delta_head);
+
+ inflateInit(&stream);
+ do {
+ in = use_pack(p, w_curs, curpos, &stream.avail_in);
+ stream.next_in = in;
+ st = inflate(&stream, Z_FINISH);
+ curpos += stream.next_in - in;
+ } while ((st == Z_OK || st == Z_BUF_ERROR) &&
+ stream.total_out < sizeof(delta_head));
+ inflateEnd(&stream);
+ if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head))
+ die("delta data unpack-initial failed");
+
+ /* Examine the initial part of the delta to figure out
+ * the result size.
+ */
+ data = delta_head;
+
+ /* ignore base size */
+ get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
+
+ /* Read the result size */
+ return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
+}
+
static off_t get_delta_base(struct packed_git *p,
struct pack_window **w_curs,
off_t *curpos,
@@ -1223,40 +1260,8 @@ static int packed_delta_info(struct packed_git *p,
* based on a base with a wrong size. This saves tons of
* inflate() calls.
*/
- if (sizep) {
- const unsigned char *data;
- unsigned char delta_head[20], *in;
- z_stream stream;
- int st;
-
- memset(&stream, 0, sizeof(stream));
- stream.next_out = delta_head;
- stream.avail_out = sizeof(delta_head);
-
- inflateInit(&stream);
- do {
- in = use_pack(p, w_curs, curpos, &stream.avail_in);
- stream.next_in = in;
- st = inflate(&stream, Z_FINISH);
- curpos += stream.next_in - in;
- } while ((st == Z_OK || st == Z_BUF_ERROR)
- && stream.total_out < sizeof(delta_head));
- inflateEnd(&stream);
- if ((st != Z_STREAM_END) &&
- stream.total_out != sizeof(delta_head))
- die("delta data unpack-initial failed");
-
- /* Examine the initial part of the delta to figure out
- * the result size.
- */
- data = delta_head;
-
- /* ignore base size */
- get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
-
- /* Read the result size */
- *sizep = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
- }
+ if (sizep)
+ *sizep = get_size_from_delta(p, w_curs, curpos);
return type;
}
--
2.48.1