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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
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(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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4
libbb/read_printf.c
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@@ -296,8 +296,8 @@ void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
if (magic.b32[0] == XZ_MAGIC2) {
# if BB_MMU
xformer = unpack_xz_stream;
/* unpack_xz_stream wants fd at position 0 */
xlseek(fd, offset, SEEK_CUR);
/* unpack_xz_stream wants fd at position 6, no need to seek */
//xlseek(fd, offset, SEEK_CUR);
# else
xformer_prog = "unxz";
# endif