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zcat: if seamless uncompressors are defined, autodetect file's format

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function                                             old     new   delta
bbunpack                                             526     622     +96
packed_usage                                       29335   29341      +6
gunzip_main                                           64      67      +3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-02-28 18:06:09 +01:00
parent f2d8478e56
commit 8e96efa323
1 changed files with 40 additions and 14 deletions
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54
archival/bbunzip.c
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@ -14,6 +14,7 @@ enum {
OPT_VERBOSE = 1 << 2,
OPT_DECOMPRESS = 1 << 3,
OPT_TEST = 1 << 4,
SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
};
static
@ -39,7 +40,7 @@ int FAST_FUNC bbunpack(char **argv,
)
{
struct stat stat_buf;
IF_DESKTOP(long long) int status;
IF_DESKTOP(long long) int status = 0;
char *filename, *new_name;
smallint exitcode = 0;
transformer_aux_data_t aux;
@ -54,14 +55,23 @@ int FAST_FUNC bbunpack(char **argv,
/* Open src */
if (filename) {
if (stat(filename, &stat_buf) != 0) {
bb_simple_perror_msg(filename);
if (!(option_mask32 & SEAMLESS_MAGIC)) {
if (stat(filename, &stat_buf) != 0) {
err_name:
bb_simple_perror_msg(filename);
err:
exitcode = 1;
goto free_name;
exitcode = 1;
goto free_name;
}
if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
goto err;
} else {
/* "clever zcat" */
int fd = open_zipped(filename);
if (fd < 0)
goto err_name;
xmove_fd(fd, STDIN_FILENO);
}
if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
goto err;
}
/* Special cases: test, stdout */
@ -98,11 +108,23 @@ int FAST_FUNC bbunpack(char **argv,
"use -f to force it");
}
init_transformer_aux_data(&aux);
aux.check_signature = 1;
status = unpacker(&aux);
if (status < 0)
exitcode = 1;
if (!(option_mask32 & SEAMLESS_MAGIC)) {
init_transformer_aux_data(&aux);
aux.check_signature = 1;
status = unpacker(&aux);
if (status < 0)
exitcode = 1;
} else {
/* "clever zcat" */
if (!filename) {
if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_detected*/ 0))
goto err;
}
if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0) {
/* Disk full, tty closed, etc. No point in continuing */
xfunc_die();
}
}
if (!(option_mask32 & OPT_STDOUT))
xclose(STDOUT_FILENO); /* with error check! */
@ -294,9 +316,13 @@ int gunzip_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "cfvdtn");
argv += optind;
/* if called as zcat */
/* If called as zcat...
* Normally, "zcat" is just "gunzip -c".
* But if seamless magic is enabled, then we are much more clever.
*/
if (applet_name[1] == 'c')
option_mask32 |= OPT_STDOUT;
option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
}