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xz compression detection: avoid the need to seek

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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>
This commit is contained in:
Denys Vlasenko
2010-07-01 05:12:28 +02:00
parent 620e863ba2
commit 45f66167fe
5 changed files with 30 additions and 14 deletions
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9
archival/bbunzip.c
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@@ -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;