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rpm2cpio: teach it to understand xz format

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-05-30 05:10:16 +02:00
parent acaaca839a
commit c88c1a0190
1 changed files with 24 additions and 11 deletions
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35
archival/rpm2cpio.c
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@@ -68,22 +68,35 @@ int rpm2cpio_main(int argc UNUSED_PARAM, char **argv)
#else
/* BLOAT */
{
unsigned char magic[2];
unsigned char magic[8];
IF_DESKTOP(long long) int FAST_FUNC (*unpack)(int src_fd, int dst_fd);
xread(rpm_fd, &magic, 2);
unpack = unpack_gz_stream;
if (magic[0] != 0x1f || magic[1] != 0x8b) {
if (!ENABLE_FEATURE_SEAMLESS_BZ2
|| magic[0] != 'B' || magic[1] != 'Z'
) {
bb_error_msg_and_die("invalid gzip"
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
" magic");
}
if (magic[0] == 0x1f && magic[1] == 0x8b) {
unpack = unpack_gz_stream;
} else
if (ENABLE_FEATURE_SEAMLESS_BZ2
&& magic[0] == 'B' && magic[1] == 'Z'
) {
unpack = unpack_bz2_stream;
} else
if (ENABLE_FEATURE_SEAMLESS_XZ
&& magic[0] == 0xfd && magic[1] == '7'
) {
/* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
/* More info at: http://tukaani.org/xz/xz-file-format.txt */
xread(rpm_fd, magic + 2, 4);
if (strcmp((char*)magic + 2, "zXZ") != 0)
goto no_magic;
xlseek(rpm_fd, -6, SEEK_CUR);
unpack = unpack_xz_stream;
} else {
no_magic:
bb_error_msg_and_die("no gzip"
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
IF_FEATURE_SEAMLESS_XZ("/xz")
" magic");
}
if (unpack(rpm_fd, STDOUT_FILENO) < 0)
bb_error_msg_and_die("error unpacking");
}