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rpm: code shrink. Now uses open_zipped's logic (factored out into setup_unzip_on_fd())

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function                                             old     new   delta
setup_unzip_on_fd                                      -      80     +80
open_zipped                                          176     113     -63
rpm_main                                            1672    1355    -317
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 80/-380)          Total: -300 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-05-06 14:19:19 +00:00
parent b8ba6b66f5
commit 27653adc8b
5 changed files with 162 additions and 150 deletions
Download Patch File Download Diff File Expand all files Collapse all files

97
libbb/read.c
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@@ -6,7 +6,6 @@
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \
@@ -16,7 +15,7 @@
)
#if ZIPPED
#include "unarchive.h"
# include "unarchive.h"
#endif
ssize_t FAST_FUNC safe_read(int fd, void *buf, size_t count)
@@ -306,14 +305,11 @@ void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
return buf;
}
int FAST_FUNC open_zipped(const char *fname)
#if ZIPPED
int FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
{
#if !ZIPPED
return open(fname, O_RDONLY);
#else
const int fail_if_not_detected = 1;
unsigned char magic[2];
char *sfx;
int fd;
#if BB_MMU
IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
enum { xformer_prog = 0 };
@@ -322,6 +318,56 @@ int FAST_FUNC open_zipped(const char *fname)
const char *xformer_prog;
#endif
/* .gz and .bz2 both have 2-byte signature, and their
* unpack_XXX_stream wants this header skipped. */
xread(fd, &magic, 2);
#if ENABLE_FEATURE_SEAMLESS_GZ
# if BB_MMU
xformer = unpack_gz_stream;
# else
xformer_prog = "gunzip";
# endif
#endif
if (!ENABLE_FEATURE_SEAMLESS_GZ
|| magic[0] != 0x1f || magic[1] != 0x8b
) {
if (!ENABLE_FEATURE_SEAMLESS_BZ2
|| magic[0] != 'B' || magic[1] != 'Z'
) {
if (fail_if_not_detected)
bb_error_msg_and_die("no gzip"
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
" magic");
xlseek(fd, -2, SEEK_CUR);
return fd;
}
#if BB_MMU
xformer = unpack_bz2_stream;
#else
xformer_prog = "bunzip2";
#endif
} else {
#if !BB_MMU
/* NOMMU version of open_transformer execs
* an external unzipper that wants
* file position at the start of the file */
xlseek(fd, -2, SEEK_CUR);
#endif
}
open_transformer(fd, xformer, xformer_prog);
return fd;
}
#endif /* ZIPPED */
int FAST_FUNC open_zipped(const char *fname)
{
#if !ZIPPED
return open(fname, O_RDONLY);
#else
char *sfx;
int fd;
fd = open(fname, O_RDONLY);
if (fd < 0)
return fd;
@@ -335,40 +381,7 @@ int FAST_FUNC open_zipped(const char *fname)
if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, ".gz") == 0)
|| (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, ".bz2") == 0)
) {
/* .gz and .bz2 both have 2-byte signature, and their
* unpack_XXX_stream wants this header skipped. */
xread(fd, &magic, 2);
#if ENABLE_FEATURE_SEAMLESS_GZ
#if BB_MMU
xformer = unpack_gz_stream;
#else
xformer_prog = "gunzip";
#endif
#endif
if (!ENABLE_FEATURE_SEAMLESS_GZ
|| magic[0] != 0x1f || magic[1] != 0x8b
) {
if (!ENABLE_FEATURE_SEAMLESS_BZ2
|| magic[0] != 'B' || magic[1] != 'Z'
) {
bb_error_msg_and_die("no gzip"
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
" magic");
}
#if BB_MMU
xformer = unpack_bz2_stream;
#else
xformer_prog = "bunzip2";
#endif
} else {
#if !BB_MMU
/* NOMMU version of open_transformer execs
* an external unzipper that wants
* file position at the start of the file */
xlseek(fd, 0, SEEK_SET);
#endif
}
open_transformer(fd, xformer, xformer_prog);
setup_unzip_on_fd(fd /*, fail_if_not_detected: 1*/);
}
}