diff options
Diffstat (limited to 'packfile.c')
| -rw-r--r-- | packfile.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/packfile.c b/packfile.c index 1116942043..9e0bbf5a0e 100644 --- a/packfile.c +++ b/packfile.c @@ -4,6 +4,7 @@ #include "dir.h" #include "mergesort.h" #include "packfile.h" +#include "delta.h" char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, @@ -909,3 +910,42 @@ unsigned long unpack_object_header_buffer(const unsigned char *buf, *sizep = size; return used; } + +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; + git_zstream stream; + int st; + + memset(&stream, 0, sizeof(stream)); + stream.next_out = delta_head; + stream.avail_out = sizeof(delta_head); + + git_inflate_init(&stream); + do { + in = use_pack(p, w_curs, curpos, &stream.avail_in); + stream.next_in = in; + st = git_inflate(&stream, Z_FINISH); + curpos += stream.next_in - in; + } while ((st == Z_OK || st == Z_BUF_ERROR) && + stream.total_out < sizeof(delta_head)); + git_inflate_end(&stream); + if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) { + error("delta data unpack-initial failed"); + return 0; + } + + /* 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)); +} |