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add get_size_from_delta()

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... 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>
This commit is contained in:
Nicolas Pitre 2007-04-16 12:31:56 -04:00 committed by Junio C Hamano
parent a3fbf4dfe1
commit 54dab52ae8
2 changed files with 40 additions and 34 deletions
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1
cache.h
View File

@ -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 */

73
sha1_file.c
View File

@ -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;
}