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authorDenys Vlasenko2010-07-01 05:12:28 +0200
committerDenys Vlasenko2010-07-01 05:12:28 +0200
commit45f66167fe96de219aac91d842f3e64d857340f6 (patch)
treec141f2aa8213089258125b370a7427bf14937aaf /archival/libunarchive/decompress_unxz.c
parent620e863ba24fe9e0126d1540e89a531264021a77 (diff)
downloadbusybox-45f66167fe96de219aac91d842f3e64d857340f6.zip
busybox-45f66167fe96de219aac91d842f3e64d857340f6.tar.gz
xz compression detection: avoid the need to seek
function old new delta unpack_unxz 12 67 +55 unpack_xz_stream 2357 2373 +16 xmalloc_read 197 199 +2 setup_unzip_on_fd 118 99 -19 rpm2cpio_main 222 203 -19 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/2 up/down: 73/-38) Total: 35 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libunarchive/decompress_unxz.c')
-rw-r--r--archival/libunarchive/decompress_unxz.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/archival/libunarchive/decompress_unxz.c b/archival/libunarchive/decompress_unxz.c
index 5d7513a..721acd9 100644
--- a/archival/libunarchive/decompress_unxz.c
+++ b/archival/libunarchive/decompress_unxz.c
@@ -56,9 +56,11 @@ unpack_xz_stream(int src_fd, int dst_fd)
if (!crc32_table)
crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
- membuf = xmalloc(2 * BUFSIZ);
memset(&iobuf, 0, sizeof(iobuf));
+ /* Preload XZ file signature */
+ membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC);
iobuf.in = membuf;
+ iobuf.in_size = HEADER_MAGIC_SIZE;
iobuf.out = membuf + BUFSIZ;
iobuf.out_size = BUFSIZ;