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tar: fix a bug where autodetection messes up -z on extract

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-02-06 20:01:11 +01:00
parent ca18e25525
commit aef441cb4d
4 changed files with 30 additions and 14 deletions
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4
archival/libarchive/get_header_tar_gz.c
View File

@ -9,7 +9,7 @@
char FAST_FUNC get_header_tar_gz(archive_handle_t *archive_handle)
{
#if BB_MMU
unsigned char magic[2];
uint16_t magic;
#endif
/* Can't lseek over pipes */
@ -21,7 +21,7 @@ char FAST_FUNC get_header_tar_gz(archive_handle_t *archive_handle)
#if BB_MMU
xread(archive_handle->src_fd, &magic, 2);
/* Can skip this check, but error message will be less clear */
if ((magic[0] != 0x1f) || (magic[1] != 0x8b)) {
if (magic != GZIP_MAGIC) {
bb_error_msg_and_die("invalid gzip magic");
}
#endif

6
archival/tar.c
View File

@ -1060,8 +1060,10 @@ int tar_main(int argc UNUSED_PARAM, char **argv)
tar_handle->src_fd = tar_fd;
tar_handle->seek = seek_by_read;
} else {
if (ENABLE_FEATURE_TAR_AUTODETECT && flags == O_RDONLY) {
get_header_ptr = get_header_tar;
if (ENABLE_FEATURE_TAR_AUTODETECT
&& flags == O_RDONLY
&& get_header_ptr == get_header_tar
) {
tar_handle->src_fd = open_zipped(tar_filename);
if (tar_handle->src_fd < 0)
bb_perror_msg_and_die("can't open '%s'", tar_filename);

20
include/archive.h
View File

@ -8,22 +8,22 @@ enum {
#if BB_BIG_ENDIAN
COMPRESS_MAGIC = 0x1f9d,
GZIP_MAGIC = 0x1f8b,
BZIP2_MAGIC = 'B' * 256 + 'Z',
BZIP2_MAGIC = 256 * 'B' + 'Z',
/* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
/* More info at: http://tukaani.org/xz/xz-file-format.txt */
XZ_MAGIC1 = 0xfd * 256 + '7',
XZ_MAGIC2 = (('z' * 256 + 'X') * 256 + 'Z') * 256 + 0,
XZ_MAGIC1 = 256 * 0xfd + '7',
XZ_MAGIC2 = 256 * (256 * (256 * 'z' + 'X') + 'Z') + 0,
/* Different form: 32 bits, then 16 bits: */
XZ_MAGIC1a = ((0xfd * 256 + '7') * 256 + 'z') * 256 + 'X',
XZ_MAGIC2a = 'Z' * 256 + 0,
XZ_MAGIC1a = 256 * (256 * (256 * 0xfd + '7') + 'z') + 'X',
XZ_MAGIC2a = 256 * 'Z' + 0,
#else
COMPRESS_MAGIC = 0x9d1f,
GZIP_MAGIC = 0x8b1f,
BZIP2_MAGIC = 'Z' * 256 + 'B',
XZ_MAGIC1 = '7' * 256 + 0xfd,
XZ_MAGIC2 = ((0 * 256 + 'Z') * 256 + 'X') * 256 + 'z',
XZ_MAGIC1a = (('X' * 256 + 'z') * 256 + '7') * 256 + 0xfd,
XZ_MAGIC2a = 0 * 256 + 'Z',
BZIP2_MAGIC = 'B' + 'Z' * 256,
XZ_MAGIC1 = 0xfd + '7' * 256,
XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
XZ_MAGIC2a = 'Z' + 0 * 256,
#endif
};

14
testsuite/tar.tests
View File

@ -154,6 +154,20 @@ dr-xr-x--- input_dir
SKIP=
}
# Had a bug where on extrace autodetect first "switched off" -z
# and then failed to recognize .tgz extension
testing "tar extract tgz" "\
dd count=1 bs=1M if=/dev/zero of=F0 2>/dev/null
tar -czf F0.tgz F0
rm F0
tar -xzvf F0.tgz && echo Ok
rm F0 || echo BAD
" "\
F0
Ok
" \
"" ""
cd .. && rm -rf tar.tempdir || exit 1