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update seamless uncompression code

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This change makes "tar tf hello_world.txz" work without
adding special-casing for ".txz" extension. It also removes
ever-growing magic checking code in rpm2cpio and get_header_tar -
we reuse one which lives in setup_unzip_on_fd.

function                                             old     new   delta
unpack_gz_stream                                       7     566    +559
check_signature16                                      -      70     +70
setup_unzip_on_fd                                     99     142     +43
handle_SIGCHLD                                         -      41     +41
unpack_bz2_stream                                    342     376     +34
unzip_main                                          2352    2385     +33
bbunpack                                             503     533     +30
open_transformer                                      74     102     +28
unpack_Z_stream                                     1278    1304     +26
unpack_gunzip                                        101     123     +22
init_transformer_aux_data                              -      18     +18
unpack_xz_stream                                    2388    2402     +14
open_zipped                                          131     141     +10
rpm_main                                            1358    1363      +5
get_header_tar_lzma                                   52      57      +5
get_header_tar_bz2                                    52      57      +5
unpack_lzma_stream                                  2698    2702      +4
hash_find                                            234     233      -1
get_header_tar                                      1759    1733     -26
get_header_tar_gz                                     92      57     -35
unpack_uncompress                                     51      12     -39
rpm2cpio_main                                        201     147     -54
unpack_unxz                                           67      12     -55
unpack_bz2_stream_prime                               55       -     -55
get_header_tar_Z                                      86       -     -86
unpack_gz_stream_with_info                           539       -    -539
------------------------------------------------------------------------------
(add/remove: 3/3 grow/shrink: 14/6 up/down: 947/-890)          Total: 57 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2012-03-06 16:27:48 +01:00
parent 774bce8e8b
commit 8a6a2f9c9c
21 changed files with 231 additions and 310 deletions
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54
include/bb_archive.h
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@@ -156,12 +156,6 @@ struct BUG_tar_header {
/* Info struct unpackers can fill out to inform users of thing like
* timestamps of unpacked files */
typedef struct unpack_info_t {
time_t mtime;
} unpack_info_t;
archive_handle_t *init_handle(void) FAST_FUNC;
char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
@@ -204,40 +198,46 @@ int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_
int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
typedef struct inflate_unzip_result {
off_t bytes_out;
uint32_t crc;
} inflate_unzip_result;
/* Meaning and direction (input/output) of the fields are transformer-specific */
typedef struct transformer_aux_data_t {
smallint check_signature; /* most often referenced member */
off_t bytes_out;
off_t bytes_in; /* used in unzip code only: needs to know packed size */
uint32_t crc32;
time_t mtime; /* gunzip code may set this on exit */
} transformer_aux_data_t;
IF_DESKTOP(long long) int inflate_unzip(inflate_unzip_result *res, off_t compr_size, int src_fd, int dst_fd) FAST_FUNC;
/* xz unpacker takes .xz stream from offset 6 */
IF_DESKTOP(long long) int unpack_xz_stream(int src_fd, int dst_fd) FAST_FUNC;
/* lzma unpacker takes .lzma stream from offset 0 */
IF_DESKTOP(long long) int unpack_lzma_stream(int src_fd, int dst_fd) FAST_FUNC;
/* the rest wants 2 first bytes already skipped by the caller */
IF_DESKTOP(long long) int unpack_bz2_stream(int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream(int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream_with_info(int src_fd, int dst_fd, unpack_info_t *info) FAST_FUNC;
IF_DESKTOP(long long) int unpack_Z_stream(int src_fd, int dst_fd) FAST_FUNC;
/* wrapper which checks first two bytes to be "BZ" */
IF_DESKTOP(long long) int unpack_bz2_stream_prime(int src_fd, int dst_fd) FAST_FUNC;
void init_transformer_aux_data(transformer_aux_data_t *aux) FAST_FUNC;
int FAST_FUNC check_signature16(transformer_aux_data_t *aux, int src_fd, unsigned magic16) FAST_FUNC;
IF_DESKTOP(long long) int inflate_unzip(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_Z_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_bz2_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_lzma_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
IF_DESKTOP(long long) int unpack_xz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd) FAST_FUNC;
char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
int bbunpack(char **argv,
IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(unpack_info_t *info),
IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_aux_data_t *aux),
char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
const char *expected_ext
) FAST_FUNC;
#if BB_MMU
void open_transformer(int fd,
IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd)) FAST_FUNC;
#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transformer)
int check_signature,
IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd)
) FAST_FUNC;
#define open_transformer_with_sig(fd, transformer, transform_prog) open_transformer((fd), 1, (transformer))
#define open_transformer_with_no_sig(fd, transformer) open_transformer((fd), 0, (transformer))
#else
void open_transformer(int src_fd, const char *transform_prog) FAST_FUNC;
#define open_transformer(fd, transformer, transform_prog) open_transformer(fd, transform_prog)
void open_transformer(int fd, const char *transform_prog) FAST_FUNC;
#define open_transformer_with_sig(fd, transformer, transform_prog) open_transformer((fd), (transform_prog))
/* open_transformer_with_no_sig() does not exist on NOMMU */
#endif
POP_SAVED_FUNCTION_VISIBILITY
#endif