xz: Add .lz (lzip) decompression support.
If configured with --disable-lzip-decoder then --long-help will still list `lzip' in --format but I left it like that since due to translations it would be messy to have two help strings. Features are disabled only in special situations so wrong help in such a situation shouldn't matter much. Thanks to Michał Górny for the original patch.
This commit is contained in:
Lasse Collin
parent
034086e1ae
commit
3176f992c5
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@ -412,6 +412,9 @@ parse_real(args_info *args, int argc, char **argv)
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{ "xz", FORMAT_XZ },
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{ "lzma", FORMAT_LZMA },
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{ "alone", FORMAT_LZMA },
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#ifdef HAVE_LZIP_DECODER
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{ "lzip", FORMAT_LZIP },
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#endif
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// { "gzip", FORMAT_GZIP },
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// { "gz", FORMAT_GZIP },
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{ "raw", FORMAT_RAW },
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@ -668,6 +671,12 @@ args_parse(args_info *args, int argc, char **argv)
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"at build time"));
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#endif
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#ifdef HAVE_LZIP_DECODER
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if (opt_mode == MODE_COMPRESS && opt_format == FORMAT_LZIP)
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message_fatal(_("Compression of lzip files (.lz) "
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"is not supported"));
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#endif
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// Never remove the source file when the destination is not on disk.
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// In test mode the data is written nowhere, but setting opt_stdout
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// will make the rest of the code behave well.
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@ -51,6 +51,11 @@ static lzma_check check;
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/// This becomes false if the --check=CHECK option is used.
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static bool check_default = true;
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/// Indicates if unconsumed input is allowed to remain after
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/// decoding has successfully finished. This is set for each file
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/// in coder_init().
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static bool allow_trailing_input;
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#ifdef MYTHREAD_ENABLED
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static lzma_mt mt_options = {
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.flags = 0,
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@ -136,6 +141,11 @@ memlimit_too_small(uint64_t memory_usage)
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extern void
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coder_set_compression_settings(void)
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{
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#ifdef HAVE_LZIP_DECODER
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// .lz compression isn't supported.
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assert(opt_format != FORMAT_LZIP);
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#endif
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// The default check type is CRC64, but fallback to CRC32
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// if CRC64 isn't supported by the copy of liblzma we are
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// using. CRC32 is always supported.
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@ -470,6 +480,18 @@ is_format_lzma(void)
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return true;
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}
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#ifdef HAVE_LZIP_DECODER
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/// Return true if the data in in_buf seems to be in the .lz format.
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static bool
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is_format_lzip(void)
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{
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static const uint8_t magic[4] = { 0x4C, 0x5A, 0x49, 0x50 };
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return strm.avail_in >= sizeof(magic)
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&& memcmp(in_buf.u8, magic, sizeof(magic)) == 0;
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}
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#endif
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#endif
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@ -483,6 +505,12 @@ coder_init(file_pair *pair)
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{
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lzma_ret ret = LZMA_PROG_ERROR;
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// In most cases if there is input left when coding finishes,
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// something has gone wrong. Exceptions are --single-stream
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// and decoding .lz files which can contain trailing non-.lz data.
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// These will be handled later in this function.
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allow_trailing_input = false;
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if (opt_mode == MODE_COMPRESS) {
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#ifdef HAVE_ENCODERS
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switch (opt_format) {
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@ -506,6 +534,14 @@ coder_init(file_pair *pair)
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ret = lzma_alone_encoder(&strm, filters[0].options);
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break;
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# ifdef HAVE_LZIP_DECODER
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case FORMAT_LZIP:
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// args.c should disallow this.
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assert(0);
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ret = LZMA_PROG_ERROR;
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break;
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# endif
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case FORMAT_RAW:
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ret = lzma_raw_encoder(&strm, filters);
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break;
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@ -522,7 +558,9 @@ coder_init(file_pair *pair)
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else
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flags |= LZMA_TELL_UNSUPPORTED_CHECK;
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if (!opt_single_stream)
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if (opt_single_stream)
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allow_trailing_input = true;
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else
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flags |= LZMA_CONCATENATED;
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// We abuse FORMAT_AUTO to indicate unknown file format,
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@ -531,8 +569,14 @@ coder_init(file_pair *pair)
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switch (opt_format) {
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case FORMAT_AUTO:
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// .lz is checked before .lzma since .lzma detection
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// is more complicated (no magic bytes).
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if (is_format_xz())
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init_format = FORMAT_XZ;
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# ifdef HAVE_LZIP_DECODER
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else if (is_format_lzip())
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init_format = FORMAT_LZIP;
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# endif
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else if (is_format_lzma())
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init_format = FORMAT_LZMA;
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break;
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@ -547,6 +591,13 @@ coder_init(file_pair *pair)
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init_format = FORMAT_LZMA;
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break;
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# ifdef HAVE_LZIP_DECODER
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case FORMAT_LZIP:
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if (is_format_lzip())
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init_format = FORMAT_LZIP;
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break;
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# endif
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case FORMAT_RAW:
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init_format = FORMAT_RAW;
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break;
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@ -604,6 +655,15 @@ coder_init(file_pair *pair)
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MODE_DECOMPRESS));
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break;
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# ifdef HAVE_LZIP_DECODER
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case FORMAT_LZIP:
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allow_trailing_input = true;
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ret = lzma_lzip_decoder(&strm,
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hardware_memlimit_get(
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MODE_DECOMPRESS), flags);
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break;
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# endif
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case FORMAT_RAW:
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// Memory usage has already been checked in
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// coder_set_compression_settings().
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@ -864,7 +924,7 @@ coder_normal(file_pair *pair)
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}
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if (ret == LZMA_STREAM_END) {
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if (opt_single_stream) {
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if (allow_trailing_input) {
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io_fix_src_pos(pair, strm.avail_in);
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success = true;
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break;
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@ -872,7 +932,9 @@ coder_normal(file_pair *pair)
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// Check that there is no trailing garbage.
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// This is needed for LZMA_Alone and raw
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// streams.
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// streams. This is *not* done with .lz files
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// as that format specifically requires
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// allowing trailing garbage.
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if (strm.avail_in == 0 && !pair->src_eof) {
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// Try reading one more byte.
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// Hopefully we don't get any more
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@ -23,6 +23,9 @@ enum format_type {
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FORMAT_AUTO,
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FORMAT_XZ,
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FORMAT_LZMA,
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#ifdef HAVE_LZIP_DECODER
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FORMAT_LZIP,
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#endif
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// HEADER_GZIP,
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FORMAT_RAW,
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};
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@ -1150,7 +1150,7 @@ message_help(bool long_help)
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puts(_("\n Basic file format and compression options:\n"));
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puts(_(
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" -F, --format=FMT file format to encode or decode; possible values are\n"
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" `auto' (default), `xz', `lzma', and `raw'\n"
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" `auto' (default), `xz', `lzma', `lzip', and `raw'\n"
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" -C, --check=CHECK integrity check type: `none' (use with caution),\n"
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" `crc32', `crc64' (default), or `sha256'"));
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puts(_(
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@ -119,7 +119,10 @@ uncompressed_name(const char *src_name, const size_t src_len)
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#ifdef __DJGPP__
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{ ".lzm", "" },
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#endif
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{ ".tlz", ".tar" },
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{ ".tlz", ".tar" }, // Both .tar.lzma and .tar.lz
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#ifdef HAVE_LZIP_DECODER
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{ ".lz", "" },
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#endif
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// { ".gz", "" },
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// { ".tgz", ".tar" },
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};
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@ -208,6 +211,15 @@ compressed_name(const char *src_name, size_t src_len)
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#endif
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".tlz",
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NULL
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#ifdef HAVE_LZIP_DECODER
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// This is needed to keep the table indexing in sync with
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// enum format_type from coder.h.
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}, {
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/*
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".lz",
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*/
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NULL
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#endif
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/*
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}, {
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".gz",
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@ -221,8 +233,11 @@ compressed_name(const char *src_name, size_t src_len)
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}
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};
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// args.c ensures this.
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// args.c ensures these.
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assert(opt_format != FORMAT_AUTO);
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#ifdef HAVE_LZIP_DECODER
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assert(opt_format != FORMAT_LZIP);
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#endif
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const size_t format = opt_format - 1;
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const char *const *suffixes = all_suffixes[format];
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@ -299,8 +314,11 @@ compressed_name(const char *src_name, size_t src_len)
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// xz foo.tar -> foo.txz
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// xz -F lzma foo.tar -> foo.tlz
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static const char *const tar_suffixes[] = {
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".txz",
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".tlz",
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".txz", // .tar.xz
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".tlz", // .tar.lzma
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/*
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".tlz", // .tar.lz
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*/
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// ".tgz",
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};
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suffix = tar_suffixes[format];
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46
src/xz/xz.1
46
src/xz/xz.1
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@ -5,7 +5,7 @@
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.\" This file has been put into the public domain.
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.\" You can do whatever you want with this file.
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.\"
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.TH XZ 1 "2022-11-07" "Tukaani" "XZ Utils"
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.TH XZ 1 "2022-11-09" "Tukaani" "XZ Utils"
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.
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.SH NAME
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xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
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@ -62,6 +62,11 @@ format, but the legacy
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format used by LZMA Utils and
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raw compressed streams with no container format headers
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are also supported.
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In addition, decompression of the
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.B .lz
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format used by
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.B lzip
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is supported.
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.PP
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.B xz
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compresses or decompresses each
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@ -102,9 +107,10 @@ or
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is appended to the source filename to get the target filename.
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.IP \(bu 3
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When decompressing, the
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.B .xz
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.BR .xz ,
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.BR .lzma ,
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or
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.B .lzma
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.B .lz
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suffix is removed from the filename to get the target filename.
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.B xz
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also recognizes the suffixes
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@ -158,8 +164,9 @@ doesn't have a suffix of any of the supported file formats
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.RB ( .xz ,
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.BR .txz ,
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.BR .lzma ,
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.BR .tlz ,
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or
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.BR .tlz ).
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.BR .lz ).
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.PP
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After successfully compressing or decompressing the
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.IR file ,
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@ -507,8 +514,9 @@ in addition to files with the
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.BR .xz ,
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.BR .txz ,
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.BR .lzma ,
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.BR .tlz ,
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or
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.B .tlz
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.B .lz
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suffix.
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If the source file has the suffix
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.IR .suf ,
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@ -575,6 +583,34 @@ The alternative name
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.B alone
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is provided for backwards compatibility with LZMA Utils.
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.TP
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.B lzip
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Accept only
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.B .lz
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files when decompressing.
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Compression is not supported.
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.IP ""
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The
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.B .lz
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format version 0 and the unextended version 1 are supported.
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Version 0 files were produced by
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.B lzip
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1.3 and older.
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Such files aren't common but may be found from file archives
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as a few source packages were released in this format.
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People might have old personal files in this format too.
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Decompression support for the format version 0 was removed in
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.B lzip
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1.18.
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.IP ""
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.B lzip
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1.4 and later create files in the format version 1.
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The sync flush marker extension to the format version 1 was added in
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.B lzip
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1.6.
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This extension is rarely used and isn't supported by
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.B xz
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(diagnosed as corrupt input).
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.TP
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.B raw
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Compress or uncompress a raw stream (no headers).
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This is meant for advanced users only.
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