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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2010-07-01 05:12:28 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2010-07-01 05:12:28 +0200 |
| commit | 45f66167fe96de219aac91d842f3e64d857340f6 (patch) | |
| tree | c141f2aa8213089258125b370a7427bf14937aaf /archival/bbunzip.c | |
| parent | 620e863ba24fe9e0126d1540e89a531264021a77 (diff) | |
| download | 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/bbunzip.c')
| -rw-r--r-- | archival/bbunzip.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/archival/bbunzip.c b/archival/bbunzip.c index b243afb2e..832a7bbf3 100644 --- a/archival/bbunzip.c +++ b/archival/bbunzip.c @@ -373,6 +373,15 @@ int unlzma_main(int argc UNUSED_PARAM, char **argv) static IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(unpack_info_t *info UNUSED_PARAM) { + struct { + uint32_t v1; + uint16_t v2; + } magic; + xread(STDIN_FILENO, &magic, 6); + if (magic.v1 != XZ_MAGIC1a || magic.v2 != XZ_MAGIC2a) { + bb_error_msg("invalid magic"); + return -1; + } return unpack_xz_stream(STDIN_FILENO, STDOUT_FILENO); } int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |