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xz: Add --single-stream.

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This can be useful when there is garbage after the
compressed stream (.xz, .lzma, or raw stream).

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This commit is contained in:
Lasse Collin 2011-03-18 18:19:19 +02:00
parent 96f94bc925
commit 57597d42ca
4 changed files with 23 additions and 3 deletions
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6
src/xz/args.c
View file

@ -68,6 +68,7 @@ parse_real(args_info *args, int argc, char **argv)
OPT_LZMA1,
OPT_LZMA2,
OPT_SINGLE_STREAM,
OPT_NO_SPARSE,
OPT_FILES,
OPT_FILES0,
@ -94,6 +95,7 @@ parse_real(args_info *args, int argc, char **argv)
{ "force", no_argument, NULL, 'f' },
{ "stdout", no_argument, NULL, 'c' },
{ "to-stdout", no_argument, NULL, 'c' },
{ "single-stream", no_argument, NULL, OPT_SINGLE_STREAM },
{ "no-sparse", no_argument, NULL, OPT_NO_SPARSE },
{ "suffix", required_argument, NULL, 'S' },
// { "recursive", no_argument, NULL, 'r' }, // TODO
@ -368,6 +370,10 @@ parse_real(args_info *args, int argc, char **argv)
break;
}
case OPT_SINGLE_STREAM:
opt_single_stream = true;
break;
case OPT_NO_SPARSE:
io_no_sparse();
break;

11
src/xz/coder.c
View file

@ -24,6 +24,7 @@ enum coder_init_ret {
enum operation_mode opt_mode = MODE_COMPRESS;
enum format_type opt_format = FORMAT_AUTO;
bool opt_auto_adjust = true;
bool opt_single_stream = false;
/// Stream used to communicate with liblzma
@ -366,8 +367,9 @@ coder_init(file_pair *pair)
break;
}
} else {
const uint32_t flags = LZMA_TELL_UNSUPPORTED_CHECK
| LZMA_CONCATENATED;
uint32_t flags = LZMA_TELL_UNSUPPORTED_CHECK;
if (!opt_single_stream)
flags |= LZMA_CONCATENATED;
// We abuse FORMAT_AUTO to indicate unknown file format,
// for which we may consider passthru mode.
@ -518,6 +520,11 @@ coder_normal(file_pair *pair)
}
if (ret == LZMA_STREAM_END) {
if (opt_single_stream) {
success = true;
break;
}
// Check that there is no trailing garbage.
// This is needed for LZMA_Alone and raw
// streams.

3
src/xz/coder.h
View file

@ -41,6 +41,9 @@ extern enum format_type opt_format;
/// they exceed the memory usage limit.
extern bool opt_auto_adjust;
/// If true, stop after decoding the first stream.
extern bool opt_single_stream;
/// Set the integrity check type used when compressing
extern void coder_set_check(lzma_check check);

6
src/xz/message.c
View file

@ -1108,7 +1108,10 @@ message_help(bool long_help)
" -f, --force force overwrite of output file and (de)compress links\n"
" -c, --stdout write to standard output and don't delete input files"));
if (long_help)
if (long_help) {
puts(_(
" --single-stream decompress only the first stream, and silently\n"
" ignore possible remaining input data"));
puts(_(
" --no-sparse do not create sparse files when decompressing\n"
" -S, --suffix=.SUF use the suffix `.SUF' on compressed files\n"
@ -1116,6 +1119,7 @@ message_help(bool long_help)
" omitted, filenames are read from the standard input;\n"
" filenames must be terminated with the newline character\n"
" --files0[=FILE] like --files but use the null character as terminator"));
}
if (long_help) {
puts(_("\n Basic file format and compression options:\n"));