Commit Graph

983 Commits

Author SHA1 Message Date
Lasse Collin 563288ea70 xz: Add support for OpenBSD's pledge() sandbox. 2022-10-25 21:30:48 +03:00
Lasse Collin f9913e8ee2 xz: Fix decompressor behavior if input uses an unsupported check type.
Now files with unsupported check will make xz display
a warning, set the exit status to 2 (unless --no-warn is used),
and then decompress the file normally. This is how it was
supposed to work since the beginning but this was broken by
the commit 231c3c7098, that is,
a little before 5.0.0 was released. The buggy behavior displayed
a message, set exit status 1 (error), and xz didn't attempt to
to decompress the file.

This doesn't matter today except for special builds that disable
CRC64 or SHA-256 at build time (but such builds should be used
in special situations only). The bug matters if new check type
is added in the future and an old xz version is used to decompress
such a file; however, it's likely that such files would use a new
filter too and an old xz wouldn't be able to decompress the file
anyway.

The first hunk in the commit is the actual fix. The second hunk
is a cleanup since LZMA_TELL_ANY_CHECK isn't used in xz.

There is a test file for unsupported check type but it wasn't
used by test_files.sh, perhaps due to different behavior between
xz and the simpler xzdec.
2022-10-25 19:07:17 +03:00
Lasse Collin aa4fe145b9 xz: Clarify the man page: input file isn't removed if an error occurs. 2022-10-25 18:36:19 +03:00
Lasse Collin 8b46ae8cde xz: Refactor to remove is_empty_filename().
Long ago it was used in list.c too but nowadays it's needed
only in io_open_src() so it's nicer to avoid a separate function.
2022-10-25 18:30:55 +03:00
Lasse Collin 8562401597 xz: If input file cannot be removed, treat it as a warning, not error.
Treating it as a warning (message + exit status 2) matches gzip
and it seems more logical as at that point the output file has
already been successfully closed. When it's a warning it is
possible to suppress it with --no-warn.
2022-10-25 18:23:54 +03:00
Lasse Collin fda9f85f52 liblzma: Threaded decoder: Stop the worker threads on errors.
It's waste of CPU time and electricity to leave the unfinished
worker threads running when it is known that their output will
get ignored.
2022-10-24 16:25:09 +03:00
Lasse Collin 2611c4d905 tuklib_cpucores: Use HW_NCPUONLINE on OpenBSD.
On OpenBSD the number of cores online is often less
than what HW_NCPU would return because OpenBSD disables
simultaneous multi-threading (SMT) by default.

Thanks to Christian Weisgerber.
2022-10-20 20:22:50 +03:00
Jia Tan 14af758a77 liblzma: Fix a compilation issue when encoders are disabled.
When encoders were disabled and threading enabled, outqueue.c and
outqueue.h were not compiled. The multi threaded decoder required
these files, so compilation failed.
2022-10-05 16:11:33 +03:00
Lasse Collin fae37ad2af tuklib_integer: Add 64-bit endianness-converting reads and writes.
Also update the comment in liblzma's memcmplen.h.

Thanks to Michał Górny for the original patch for the reads.
2022-10-05 14:26:00 +03:00
Lasse Collin 508a44372c liblzma: Add API doc note about the .xz decoder LZMA_MEMLIMIT_ERROR bug.
The bug was fixed in 660739f99a.
2022-09-30 12:06:13 +03:00
Jia Tan 8cc9874a79 liblzma: Add dest and src NULL checks to lzma_index_cat.
The documentation states LZMA_PROG_ERROR can be returned from
lzma_index_cat. Previously, lzma_index_cat could not return
LZMA_PROG_ERROR. Now, the validation is similar to
lzma_index_append, which does a NULL check on the index
parameter.
2022-09-28 15:48:03 +03:00
Jia Tan 3d5a99ca37 liblzma: Fix copying of check type statistics in lzma_index_cat().
The check type of the last Stream in dest was never copied to
dest->checks (the code tried to copy it but it was done too late).
This meant that the value returned by lzma_index_checks() would
only include the check type of the last Stream when multiple
lzma_indexes had been concatenated.

In xz --list this meant that the summary would only list the
check type of the last Stream, so in this sense this was only
a visual bug. However, it's possible that some applications
use this information for purposes other than merely showing
it to the users in an informational message. I'm not aware of
such applications though and it's quite possible that such
applications don't exist.

Regular streamed decompression in xz or any other application
doesn't use lzma_index_cat() and so this bug cannot affect them.
2022-09-28 15:29:49 +03:00
Lasse Collin a61d321727 tuklib_physmem: Fix Unicode builds on Windows.
Thanks to ArSaCiA Game.
2022-09-28 12:20:41 +03:00
Lasse Collin 660739f99a liblzma: Stream decoder: Fix restarting after LZMA_MEMLIMIT_ERROR.
If lzma_code() returns LZMA_MEMLIMIT_ERROR it is now possible
to use lzma_memlimit_set() to increase the limit and continue
decoding. This was supposed to work from the beginning but
there was a bug. With other decoders (.lzma or threaded .xz)
this already worked correctly.
2022-09-28 11:05:15 +03:00
Lasse Collin 7e68fda58c liblzma: Stream decoder: Fix comments. 2022-09-28 11:00:23 +03:00
Lasse Collin f664cb2584 liblzma: ARM64: Add comments. 2022-09-20 16:58:22 +03:00
Lasse Collin b557b4a0ee liblzma: ARM64: Fix wrong comment in API doc.
Thanks to Jia Tan.
2022-09-20 16:27:50 +03:00
Lasse Collin d5b0906fa5 xz: Add --experimental-arm64[=width=WIDTH].
It will be renamed to --arm64 once it is stable.

Man page or --long-help weren't updated yet.
2022-09-19 20:24:26 +03:00
Lasse Collin ecb966de30 liblzma: Add experimental ARM64 BCJ filter with a temporary Filter ID.
That is, the Filter ID will be changed once the design is final.
The current version will be removed. So files created with the
tempoary Filter ID won't be supported in the future.
2022-09-19 20:23:46 +03:00
Lasse Collin 177bdc922c liblzma: Simple/BCJ filters: Allow disabling generic BCJ options.
This will be needed for the ARM64 BCJ filter as it will use
its own options struct.
2022-09-17 22:42:18 +03:00
Lasse Collin 097c7b67ce xzgrep: Fix compatibility with old shells.
Running the current xzgrep on Slackware 10.1 with GNU bash 3.00.15:

    xzgrep: line 231: syntax error near unexpected token `;;'

On SCO OpenServer 5.0.7 with Korn Shell 93r:

    syntax error at line 231 : `;;' unexpected

Turns out that some old shells don't like apostrophes (') inside
command substitutions. For example, the following fails:

    x=$(echo foo
    # asdf'zxcv
    echo bar)
    printf '%s\n' "$x"

The problem was introduced by commits
69d1b3fc29 (2022-03-29),
bd7b290f3f (2022-07-18), and
a648978b20 (2022-07-19).
5.2.6 is the only stable release that included
this problem.

Thanks to Kevin R. Bulgrien for reporting the problem
on SCO OpenServer 5.0.7 and for providing the fix.
2022-09-16 14:07:03 +03:00
Lasse Collin f8ee61e74e liblzma: lzma_filters_copy: Keep dest[] unmodified if an error occurs.
lzma_stream_encoder() and lzma_stream_encoder_mt() always assumed
this. Before this patch, failing lzma_filters_copy() could result
in free(invalid_pointer) or invalid memory reads in stream_encoder.c
or stream_encoder_mt.c.

To trigger this, allocating memory for a filter options structure
has to fail. These are tiny allocations so in practice they very
rarely fail.

Certain badness in the filter chain array could also make
lzma_filters_copy() fail but both stream_encoder.c and
stream_encoder_mt.c validate the filter chain before
trying to copy it, so the crash cannot occur this way.
2022-09-09 13:51:57 +03:00
Jia Tan 18d7facd38 liblzma: lzma_index_append: Add missing integer overflow check.
The documentation in src/liblzma/api/lzma/index.h suggests that
both the unpadded (compressed) size and the uncompressed size
are checked for overflow, but only the unpadded size was checked.
The uncompressed check is done first since that is more likely to
occur than the unpadded or index field size overflows.
2022-09-08 15:19:19 +03:00
Lasse Collin 913ddc5572 liblzma: Vaccinate against an ill patch from RHEL/CentOS 7.
RHEL/CentOS 7 shipped with 5.1.2alpha, including the threaded
encoder that is behind #ifdef LZMA_UNSTABLE in the API headers.
In 5.1.2alpha these symbols are under XZ_5.1.2alpha in liblzma.map.
API/ABI compatibility tracking isn't done between development
releases so newer releases didn't have XZ_5.1.2alpha anymore.

Later RHEL/CentOS 7 updated xz to 5.2.2 but they wanted to keep
the exported symbols compatible with 5.1.2alpha. After checking
the ABI changes it turned out that >= 5.2.0 ABI is backward
compatible with the threaded encoder functions from 5.1.2alpha
(but not vice versa as fixes and extensions to these functions
were made between 5.1.2alpha and 5.2.0).

In RHEL/CentOS 7, XZ Utils 5.2.2 was patched with
xz-5.2.2-compat-libs.patch to modify liblzma.map:

  - XZ_5.1.2alpha was added with lzma_stream_encoder_mt and
    lzma_stream_encoder_mt_memusage. This matched XZ Utils 5.1.2alpha.

  - XZ_5.2 was replaced with XZ_5.2.2. It is clear that this was
    an error; the intention was to keep using XZ_5.2 (XZ_5.2.2
    has never been used in XZ Utils). So XZ_5.2.2 lists all
    symbols that were listed under XZ_5.2 before the patch.
    lzma_stream_encoder_mt and _mt_memusage are included too so
    they are listed both here and under XZ_5.1.2alpha.

The patch didn't add any __asm__(".symver ...") lines to the .c
files. Thus the resulting liblzma.so exports the threaded encoder
functions under XZ_5.1.2alpha only. Listing the two functions
also under XZ_5.2.2 in liblzma.map has no effect without
matching .symver lines.

The lack of XZ_5.2 in RHEL/CentOS 7 means that binaries linked
against unpatched XZ Utils 5.2.x won't run on RHEL/CentOS 7.
This is unfortunate but this alone isn't too bad as the problem
is contained within RHEL/CentOS 7 and doesn't affect users
of other distributions. It could also be fixed internally in
RHEL/CentOS 7.

The second problem is more serious: In XZ Utils 5.2.2 the API
headers don't have #ifdef LZMA_UNSTABLE for obvious reasons.
This is true in RHEL/CentOS 7 version too. Thus now programs
using new APIs can be compiled without an extra #define. However,
the programs end up depending on symbol version XZ_5.1.2alpha
(and possibly also XZ_5.2.2) instead of XZ_5.2 as they would
with an unpatched XZ Utils 5.2.2. This means that such binaries
won't run on other distributions shipping XZ Utils >= 5.2.0 as
they don't provide XZ_5.1.2alpha or XZ_5.2.2; they only provide
XZ_5.2 (and XZ_5.0). (This includes RHEL/CentOS 8 as the patch
luckily isn't included there anymore with XZ Utils 5.2.4.)

Binaries built by RHEL/CentOS 7 users get distributed and then
people wonder why they don't run on some other distribution.
Seems that people have found out about the patch and been copying
it to some build scripts, seemingly curing the symptoms but
actually spreading the illness further and outside RHEL/CentOS 7.

The ill patch seems to be from late 2016 (RHEL 7.3) and in 2017 it
had spread at least to EasyBuild. I heard about the events only
recently. :-(

This commit splits liblzma.map into two versions: one for
GNU/Linux and another for other OSes that can use symbol versioning
(FreeBSD, Solaris, maybe others). The Linux-specific file and the
matching additions to .c files add full compatibility with binaries
that have been built against a RHEL/CentOS-patched liblzma. Builds
for OSes other than GNU/Linux won't get the vaccine as they should
be immune to the problem (I really hope that no build script uses
the RHEL/CentOS 7 patch outside GNU/Linux).

The RHEL/CentOS compatibility symbols XZ_5.1.2alpha and XZ_5.2.2
are intentionally put *after* XZ_5.2 in liblzma_linux.map. This way
if one forgets to #define HAVE_SYMBOL_VERSIONS_LINUX when building,
the resulting liblzma.so.5 will have lzma_stream_encoder_mt@@XZ_5.2
since XZ_5.2 {...} is the first one that lists that function.
Without HAVE_SYMBOL_VERSIONS_LINUX @XZ_5.1.2alpha and @XZ_5.2.2
will be missing but that's still a minor problem compared to
only having lzma_stream_encoder_mt@@XZ_5.1.2alpha!

The "local: *;" line was moved to XZ_5.0 so that it doesn't need
to be moved around. It doesn't matter where it is put.

Having two similar liblzma_*.map files is a bit silly as it is,
at least for now, easily possible to generate the generic one
from the Linux-specific file. But that adds extra steps and
increases the risk of mistakes when supporting more than one
build system. So I rather maintain two files in parallel and let
validate_map.sh check that they are in sync when "make mydist"
is run.

This adds .symver lines for lzma_stream_encoder_mt@XZ_5.2.2 and
lzma_stream_encoder_mt_memusage@XZ_5.2.2 even though these
weren't exported by RHEL/CentOS 7 (only @@XZ_5.1.2alpha was
for these two). I added these anyway because someone might
misunderstand the RHEL/CentOS 7 patch and think that @XZ_5.2.2
(@@XZ_5.2.2) versions were exported too.

At glance one could suggest using __typeof__ to copy the function
prototypes when making aliases. However, this doesn't work trivially
because __typeof__ won't copy attributes (lzma_nothrow, lzma_pure)
and it won't change symbol visibility from hidden to default (done
by LZMA_API()). Attributes could be copied with __copy__ attribute
but that needs GCC 9 and a fallback method would be needed anyway.

This uses __symver__ attribute with GCC >= 10 and
__asm__(".symver ...") with everything else. The attribute method
is required for LTO (-flto) support with GCC. Using -flto with
GCC older than 10 is now broken on GNU/Linux and will not be fixed
(can silently result in a broken liblzma build that has dangerously
incorrect symbol versions). LTO builds with Clang seem to work
with the traditional __asm__(".symver ...") method.

Thanks to Boud Roukema for reporting the problem and discussing
the details and testing the fix.
2022-09-08 15:01:29 +03:00
Lasse Collin c1555b1a22 Bump version number for 5.3.3alpha. 2022-08-22 18:16:40 +03:00
Lasse Collin 311e4f85ed xz: Try to clarify --memlimit-mt-decompress vs. --memlimit-compress. 2022-08-22 18:01:21 +03:00
Lasse Collin 02a777f9c4 xz: Revise --info-memory output.
The strings could be more descriptive but it's good
to have some version of this committed now.

--robot mode wasn't changed yet.
2022-08-19 23:40:00 +03:00
Lasse Collin f864f6d42e xz: Update the man page for threaded decompression and memlimits.
This documents the changes made in commits
6c6da57ae2,
cad299008c, and
898faa9728.

The --info-memory bit hasn't been finished yet
even though it's already mentioned in this commit
under --memlimit-mt-decompress and --threads.
2022-08-19 23:15:56 +03:00
Lasse Collin c4e8e5fb31 liblzma: Threaded decoder: Improve LZMA_FAIL_FAST when LZMA_FINISH is used.
It will now return LZMA_DATA_ERROR (not LZMA_OK or LZMA_BUF_ERROR)
if LZMA_FINISH is used and there isn't enough input to finish
decoding the Block Header or the Block. The use of LZMA_DATA_ERROR
is simpler and the less risky than LZMA_BUF_ERROR but this might
be changed before 5.4.0.
2022-08-18 17:16:49 +03:00
Jia Tan 61f8ec804a liblzma: Refactor lzma_mf_is_supported() to use a switch-statement. 2022-07-25 18:30:10 +03:00
Lasse Collin 9cc721af54 xz: Update the man page that change to --keep will be in 5.2.6. 2022-07-24 13:27:48 +03:00
Lasse Collin d796b6d7fd xzgrep man page: Document exit statuses. 2022-07-19 23:19:49 +03:00
Lasse Collin 923bf96b55 xzgrep: Improve error handling, especially signals.
xzgrep wouldn't exit on SIGPIPE or SIGQUIT when it clearly
should have. It's quite possible that it's not perfect still
but at least it's much better.

If multiple exit statuses compete, now it tries to pick
the largest of value.

Some comments were added.

The exit status handling of signals is still broken if the shell
uses values larger than 255 in $? to indicate that a process
died due to a signal ***and*** their "exit" command doesn't take
this into account. This seems to work well with the ksh and yash
versions I tried. However, there is a report in gzip/zgrep that
OpenSolaris 5.11 (not 5.10) has a problem with "exit" truncating
the argument to 8 bits:

    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22900#25

Such a bug would break xzgrep but I didn't add a workaround
at least for now. 5.11 is old and I don't know if the problem
exists in modern descendants, or if the problem exists in other
ksh implementations in use.
2022-07-19 23:13:24 +03:00
Lasse Collin a648978b20 xzgrep: Make the fix for ZDI-CAN-16587 more robust.
I don't know if this can make a difference in the real world
but it looked kind of suspicious (what happens with sed
implementations that cannot process very long lines?).
At least this commit shouldn't make it worse.
2022-07-19 00:10:55 +03:00
Lasse Collin bd7b290f3f xzgrep: Use grep -H --label when available (GNU, *BSDs).
It avoids the use of sed for prefixing filenames to output lines.
Using sed for that is slower and prone to security bugs so now
the sed method is only used as a fallback.

This also fixes an actual bug: When grepping a binary file,
GNU grep nowadays prints its diagnostics to stderr instead of
stdout and thus the sed-method for prefixing the filename doesn't
work. So with this commit grepping binary files gives reasonable
output with GNU grep now.

This was inspired by zgrep but the implementation is different.
2022-07-18 22:06:10 +03:00
Lasse Collin b56729af9f xzgrep: Use -e to specify the pattern to grep.
Now we don't need the separate test for adding the -q option
as it can be added directly in the two places where it's needed.
2022-07-18 21:10:25 +03:00
Lasse Collin bad61b5997 Scripts: Use printf instead of echo in a few places.
It's a good habbit as echo has some portability corner cases
when the string contents can be anything.
2022-07-18 19:18:48 +03:00
Lasse Collin 6a4a4a7d26 xzgrep: Add more LC_ALL=C to avoid bugs with multibyte characters.
Also replace one use of expr with printf.

The rationale for LC_ALL=C was already mentioned in
69d1b3fc29 that fixed a security
issue. However, unrelated uses weren't changed in that commit yet.

POSIX says that with sed and such tools one should use LC_ALL=C
to ensure predictable behavior when strings contain byte sequences
that aren't valid multibyte characters in the current locale. See
under "Application usage" in here:

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html

With GNU sed invalid multibyte strings would work without this;
it's documented in its Texinfo manual. Some other implementations
aren't so forgiving.
2022-07-17 21:36:25 +03:00
Lasse Collin b48f9d615f xzgrep: Fix parsing of certain options.
Fix handling of "xzgrep -25 foo" (in GNU grep "grep -25 foo" is
an alias for "grep -C25 foo"). xzgrep would treat "foo" as filename
instead of as a pattern. This bug was fixed in zgrep in gzip in 2012.

Add -E, -F, -G, and -P to the "no argument required" list.

Add -X to "argument required" list. It is an
intentionally-undocumented GNU grep option so this isn't
an important option for xzgrep but it seems that other grep
implementations (well, those that I checked) don't support -X
so I hope this change is an improvement still.

grep -d (grep --directories=ACTION) requires an argument. In
contrast to zgrep, I kept -d in the "no argument required" list
because it's not supported in xzgrep (or zgrep). This way
"xzgrep -d" gives an error about option being unsupported instead
of telling that it requires an argument. Both zgrep and xzgrep
tell that it's unsupported if an argument is specified.

Add comments.
2022-07-17 20:57:06 +03:00
Lasse Collin 107c93ee5c liblzma: Rename a variable and improve a comment. 2022-07-14 18:12:38 +03:00
Lasse Collin 9595a3119b liblzma: Add optional autodetection of LZMA end marker.
Turns out that this is needed for .lzma files as the spec in
LZMA SDK says that end marker may be present even if the size
is stored in the header. Such files are rare but exist in the
real world. The code in liblzma is so old that the spec didn't
exist in LZMA SDK back then and I had understood that such
files weren't possible (the lzma tool in LZMA SDK didn't
create such files).

This modifies the internal API so that LZMA decoder can be told
if EOPM is allowed even when the uncompressed size is known.
It's allowed with .lzma and not with other uses.

Thanks to Karl Beldan for reporting the problem.
2022-07-13 22:24:07 +03:00
Lasse Collin 0c0f8e9761 xz: Document the special memlimit case of 2000 MiB on MIPS32.
See commit fc3d3a7296.
2022-07-12 18:53:04 +03:00
Lasse Collin 2ce4f36f17 liblzma: Silence a warning.
The actual initialization is done via mythread_sync and seems
that GCC doesn't necessarily see that it gets initialized there.
2022-05-23 19:37:18 +03:00
Lasse Collin 5d8f3764ef xz: Fix build with --disable-threads. 2022-04-14 20:53:16 +03:00
Lasse Collin 1d59289727 xz: Change the cap of the default -T0 memlimit for 32-bit xz.
The SIZE_MAX / 3 was 1365 MiB. 1400 MiB gives little more room
and it looks like a round (artificial) number in --info-memory
once --info-memory is made to display it.

Also, using #if avoids useless code on 64-bit builds.
2022-04-14 14:50:17 +03:00
Lasse Collin c77fe55ddb xz: Add a default soft memory usage limit for --threads=0.
This is a soft limit in sense that it only affects the number of
threads. It never makes xz fail and it never makes xz change
settings that would affect the compressed output.

The idea is to make -T0 have more reasonable behavior when
the system has very many cores or when a memory-hungry
compression options are used. This also helps with 32-bit xz,
preventing it from running out of address space.

The downside of this commit is that now the number of threads
might become too low compared to what the user expected. I
hope this to be an acceptable compromise as the old behavior
has been a source of well-argued complaints for a long time.
2022-04-14 14:20:46 +03:00
Lasse Collin 0adc13bfe3 xz: Make -T0 use multithreaded mode on single-core systems.
The main problem withi the old behavior is that the compressed
output is different on single-core systems vs. multicore systems.
This commit fixes it by making -T0 one thread in multithreaded mode
on single-core systems.

The downside of this is that it uses more memory. However, if
--memlimit-compress is used, xz can (thanks to the previous commit)
drop to the single-threaded mode still.
2022-04-14 13:00:40 +03:00
Lasse Collin 898faa9728 xz: Changes to --memlimit-compress and --no-adjust.
In single-threaded mode, --memlimit-compress can make xz scale down
the LZMA2 dictionary size to meet the memory usage limit. This
obviously affects the compressed output. However, if xz was in
threaded mode, --memlimit-compress could make xz reduce the number
of threads but it wouldn't make xz switch from multithreaded mode
to single-threaded mode or scale down the LZMA2 dictionary size.
This seemed illogical and there was even a "FIXME?" about it.

Now --memlimit-compress can make xz switch to single-threaded
mode if one thread in multithreaded mode uses too much memory.
If memory usage is still too high, then the LZMA2 dictionary
size can be scaled down too.

The option --no-adjust was also changed so that it no longer
prevents xz from scaling down the number of threads as that
doesn't affect compressed output (only performance). After
this commit --no-adjust only prevents adjustments that affect
compressed output, that is, with --no-adjust xz won't switch
from multithreaded mode to single-threaded mode and won't
scale down the LZMA2 dictionary size.

The man page wasn't updated yet.
2022-04-14 12:38:00 +03:00
Lasse Collin cad299008c xz: Add --memlimit-mt-decompress along with a default limit value.
--memlimit-mt-decompress allows specifying the limit for
multithreaded decompression. This matches memlimit_threading in
liblzma. This limit can only affect the number of threads being
used; it will never prevent xz from decompressing a file. The
old --memlimit-decompress option is still used at the same time.

If the value of --memlimit-decompress (the default value or
one specified by the user) is less than the value of
--memlimit-mt-decompress , then --memlimit-mt-decompress is
reduced to match --memlimit-decompress.

Man page wasn't updated yet.
2022-04-12 00:04:30 +03:00
Lasse Collin fe87b4cd53 liblzma: Threaded decoder: Improve setting of pending_error.
It doesn't need to be done conditionally. The comments try
to explain it.
2022-04-06 23:11:59 +03:00
Lasse Collin 90621da7f6 liblzma: Add a new flag LZMA_FAIL_FAST for threaded decoder.
In most cases if the input file is corrupt the application won't
care about the uncompressed content at all. With this new flag
the threaded decoder will return an error as soon as any thread
has detected an error; it won't wait to copy out the data before
the location of the error.

I don't plan to use this in xz to keep the behavior consistent
between single-threaded and multi-threaded modes.
2022-04-06 13:16:00 +03:00
Lasse Collin 64b6d496dc liblzma: Threaded decoder: Always wait for output if LZMA_FINISH is used.
This makes the behavior consistent with the single-threaded
decoder when handling truncated .xz files.

Thanks to Jia Tan for finding this issue.
2022-04-05 12:24:57 +03:00
Lasse Collin e671bc8828 liblzma: Threaded decoder: Support zpipe.c-style decoding loop.
This makes it possible to call lzma_code() in a loop that only
reads new input when lzma_code() didn't fill the output buffer
completely. That isn't the calling style suggested by the
liblzma example program 02_decompress.c so perhaps the usefulness
of this feature is limited.

Also, it is possible to write such a loop so that it works
with the single-threaded decoder but not with the threaded
decoder even after this commit, or so that it works only if
lzma_mt.timeout = 0.

The zlib tutorial <https://zlib.net/zlib_how.html> is a well-known
example of a loop where more input is read only when output isn't
full. Porting this as is to liblzma would work with the
single-threaded decoder (if LZMA_CONCATENATED isn't used) but it
wouldn't work with threaded decoder even after this commit because
the loop assumes that no more output is possible when it cannot
read more input ("if (strm.avail_in == 0) break;"). This cannot
be fixed at liblzma side; the loop has to be modified at least
a little.

I'm adding this in any case because the actual code is simple
and short and should have no harmful side-effects in other
situations.
2022-04-02 21:49:59 +03:00
Lasse Collin 69d1b3fc29 xzgrep: Fix escaping of malicious filenames (ZDI-CAN-16587).
Malicious filenames can make xzgrep to write to arbitrary files
or (with a GNU sed extension) lead to arbitrary code execution.

xzgrep from XZ Utils versions up to and including 5.2.5 are
affected. 5.3.1alpha and 5.3.2alpha are affected as well.
This patch works for all of them.

This bug was inherited from gzip's zgrep. gzip 1.12 includes
a fix for zgrep.

The issue with the old sed script is that with multiple newlines,
the N-command will read the second line of input, then the
s-commands will be skipped because it's not the end of the
file yet, then a new sed cycle starts and the pattern space
is printed and emptied. So only the last line or two get escaped.

One way to fix this would be to read all lines into the pattern
space first. However, the included fix is even simpler: All lines
except the last line get a backslash appended at the end. To ensure
that shell command substitution doesn't eat a possible trailing
newline, a colon is appended to the filename before escaping.
The colon is later used to separate the filename from the grep
output so it is fine to add it here instead of a few lines later.

The old code also wasn't POSIX compliant as it used \n in the
replacement section of the s-command. Using \<newline> is the
POSIX compatible method.

LC_ALL=C was added to the two critical sed commands. POSIX sed
manual recommends it when using sed to manipulate pathnames
because in other locales invalid multibyte sequences might
cause issues with some sed implementations. In case of GNU sed,
these particular sed scripts wouldn't have such problems but some
other scripts could have, see:

    info '(sed)Locale Considerations'

This vulnerability was discovered by:
cleemy desu wayo working with Trend Micro Zero Day Initiative

Thanks to Jim Meyering and Paul Eggert discussing the different
ways to fix this and for coordinating the patch release schedule
with gzip.
2022-03-29 20:10:50 +03:00
Lasse Collin bd93b776c1 liblzma: Fix a deadlock in threaded decoder.
If a worker thread has consumed all input so far and it's
waiting on thr->cond and then the main thread enables
partial update for that thread, the code used to deadlock.
This commit allows one dummy decoding pass to occur in this
situation which then also does the partial update.

As part of the fix, this moves thr->progress_* updates to
avoid the second thr->mutex locking.

Thanks to Jia Tan for finding, debugging, and reporting the bug.
2022-03-26 01:15:32 +02:00
Lasse Collin 487c77d487 liblzma: Threaded decoder: Don't stop threads on LZMA_TIMED_OUT.
LZMA_TIMED_OUT is not an error and thus stopping threads on
LZMA_TIMED_OUT breaks the decoder badly.

Thanks to Jia Tan for finding the bug and for the patch.
2022-03-23 16:28:55 +02:00
Lasse Collin 6c6da57ae2 xz: Add initial support for threaded decompression.
If threading support is enabled at build time, this will
use lzma_stream_decoder_mt() even for single-threaded mode.
With memlimit_threading=0 the behavior should be identical.

This needs some work like adding --memlimit-threading=LIMIT.

The original patch from Sebastian Andrzej Siewior included
a method to get currently available RAM on Linux. It might
be one way to go but as it is Linux-only, the available-RAM
approach needs work for portability or using a fallback method
on other OSes.

The man page wasn't updated yet.
2022-03-07 00:36:16 +02:00
Lasse Collin 4cce3e27f5 liblzma: Add threaded .xz decompressor.
I realize that this is about a decade late.

Big thanks to Sebastian Andrzej Siewior for the original patch.
I made a bunch of smaller changes but after a while quite a few
things got rewritten. So any bugs in the commit were created by me.
2022-03-07 00:35:53 +02:00
Lasse Collin 717631b978 liblzma: Fix docs: lzma_block_decoder() cannot return LZMA_UNSUPPORTED_CHECK.
If Check is unsupported, it will be silently ignored.
It's the caller's job to handle it.
2022-03-06 16:54:23 +02:00
Lasse Collin 1a4bb97a00 liblzma: Add new output queue (lzma_outq) features.
Add lzma_outq_clear_cache2() which may leave one buffer allocated
in the cache.

Add lzma_outq_outbuf_memusage() to get the memory needed for
a single lzma_outbuf. This is now used internally in outqueue.c too.

Track both the total amount of memory allocated and the amount of
memory that is in active use (not in cache).

In lzma_outbuf, allow storing the current input position that
matches the current output position. This way the main thread
can notice when no more output is possible without first providing
more input.

Allow specifying return code for lzma_outq_read() in a finished
lzma_outbuf.
2022-03-06 16:41:19 +02:00
Lasse Collin ddbc6f58c2 liblzma: Index hash: Change return value type of hash_append() to void. 2022-03-06 15:18:58 +02:00
Lasse Collin 20e7a33e2d liblzma: Minor addition to lzma_vli_size() API doc.
Thanks to Jia Tan.
2022-02-22 03:42:57 +02:00
Lasse Collin 4f78f5fcf6 liblzma: Check the return value of lzma_index_append() in threaded encoder.
If lzma_index_append() failed (most likely memory allocation failure)
it could have gone unnoticed and the resulting .xz file would have
an incorrect Index. Decompressing such a file would produce the
correct uncompressed data but then an error would occur when
verifying the Index field.
2022-02-22 02:04:18 +02:00
Ed Maste 865e0a3689 liblzma: Use non-executable stack on FreeBSD as on Linux 2022-02-22 01:23:34 +02:00
Lasse Collin 1c9a5786d2 liblzma: Make Block decoder catch certain types of errors better.
Now it limits the input and output buffer sizes that are
passed to a raw decoder. This way there's no need to check
if the sizes can grow too big or overflow when updating
Compressed Size and Uncompressed Size counts. This also means
that a corrupt file cannot cause the raw decoder to process
useless extra input or output that would exceed the size info
in Block Header (and thus cause LZMA_DATA_ERROR anyway).

More importantly, now the size information is verified more
carefully in case raw decoder returns LZMA_OK. This doesn't
really matter with the current single-threaded .xz decoder
as the errors would be detected slightly later anyway. But
this helps avoiding corner cases in the upcoming threaded
decompressor, and it might help other Block decoder uses
outside liblzma too.

The test files bad-1-lzma2-{9,10,11}.xz test these conditions.
With the single-threaded .xz decoder the only difference is
that LZMA_DATA_ERROR is detected in a difference place now.
2022-02-20 20:36:27 +02:00
jiat75 6468f7e41a liblzma: Add NULL checks to LZMA and LZMA2 properties encoders.
Previously lzma_lzma_props_encode() and lzma_lzma2_props_encode()
assumed that the options pointers must be non-NULL because the
with these filters the API says it must never be NULL. It is
good to do these checks anyway.
2022-02-07 00:20:01 +02:00
Lasse Collin 2523c30705 liblzma: Fix uint64_t vs. size_t confusion.
This broke 32-bit builds due to a pointer type mismatch.

This bug was introduced with the output-size-limited encoding
in 625f4c7c99.

Thanks to huangqinjin for the bug report.
2022-02-06 23:19:32 +02:00
Lasse Collin 2024fbf279 xzgrep: Update man page timestamp. 2021-11-13 21:04:05 +02:00
Ville Skyttä 3a512c7787 xzgrep: use `grep -E/-F` instead of `egrep` and `fgrep`
`egrep` and `fgrep` have been deprecated in GNU grep since 2007, and in
current post 3.7 Git they have been made to emit obsolescence warnings:
https://git.savannah.gnu.org/cgit/grep.git/commit/?id=a9515624709865d480e3142fd959bccd1c9372d1
2021-11-13 18:17:33 +02:00
Lasse Collin edf525e2b1 Bump the version number for 5.3.2alpha. 2021-10-28 23:02:11 +03:00
Lasse Collin f2aea1d5a5 xz: Change the coding style of the previous commit.
It isn't any better now but it's consistent with
the rest of the code base.
2021-10-27 23:23:11 +03:00
Alexander Bluhm 892b16cc28 xz: Avoid fchown(2) failure.
OpenBSD does not allow to change the group of a file if the user
does not belong to this group.  In contrast to Linux, OpenBSD also
fails if the new group is the same as the old one.  Do not call
fchown(2) in this case, it would change nothing anyway.

This fixes an issue with Perl Alien::Build module.
https://github.com/PerlAlien/Alien-Build/issues/62
2021-10-27 20:49:41 +03:00
Lasse Collin 2b509c868c liblzma: Fix liblzma.map for the lzma_microlzma_* symbols.
This should have been part of d267d109c3.

Thanks to Gao Xiang.
2021-09-17 17:31:11 +03:00
Lasse Collin 6928aac9da liblzma: Use _MSVC_LANG to detect when "noexcept" can be used with MSVC.
By default, MSVC always sets __cplusplus to 199711L. The real
C++ standard version is available in _MSVC_LANG (or one could
use /Zc:__cplusplus to set __cplusplus correctly).

Fixes <https://sourceforge.net/p/lzmautils/discussion/708858/thread/f6bc3b108a/>.

Thanks to Dan Weiss.
2021-09-09 21:41:51 +03:00
Lasse Collin d267d109c3 liblzma: Rename EROFS LZMA to MicroLZMA.
It still exists primarily for EROFS but MicroLZMA is
a more generic name (that hopefully doesn't clash with
something that already exists).
2021-09-05 20:38:12 +03:00
Lasse Collin 3247e95115 xzdiff: Update the man page about the exit status.
This was forgotten from 194029ffaf.
2021-06-04 19:02:38 +03:00
Lasse Collin 96f5a28a46 xzless: Fix less(1) version detection when it contains a dot.
Sometimes the version number from "less -V" contains a dot,
sometimes not. xzless failed detect the version number when
it does contain a dot. This fixes it.

Thanks to nick87720z for reporting this. Apparently it had been
reported here <https://bugs.gentoo.org/489362> in 2013.
2021-06-04 18:52:48 +03:00
Ivan A. Melnikov fc3d3a7296 Reduce maximum possible memory limit on MIPS32
Due to architectural limitations, address space available to a single
userspace process on MIPS32 is limited to 2 GiB, not 4, even on systems
that have more physical RAM -- e.g. 64-bit systems with 32-bit
userspace, or systems that use XPA (an extension similar to x86's PAE).

So, for MIPS32, we have to impose stronger memory limits. I've chosen
2000MiB to give the process some headroom.
2021-04-11 19:50:41 +03:00
Lasse Collin 6c6f0db340 liblzma: Fix unitialized variable.
This was introduced two weeks ago in the commit
625f4c7c99.

Thanks to Nathan Moinvaziri.
2021-01-29 21:19:08 +02:00
Lasse Collin 6b8abc84a5 liblzma: Fix a wrong comment in stream_encoder_mt.c. 2021-01-24 19:22:35 +02:00
Lasse Collin db465419ae liblzma: In EROFS LZMA decoder, verify that comp_size matches at the end.
When the uncompressed size is known to be exact, after decompressing
the stream exactly comp_size bytes of input must have been consumed.
This is a minor improvement to error detection.
2021-01-17 19:20:50 +02:00
Lasse Collin 774cc0118b liblzma: Make EROFS LZMA decoder work when exact uncomp_size isn't known.
The caller must still not specify an uncompressed size bigger
than the actual uncompressed size.

As a downside, this now needs the exact compressed size.
2021-01-17 18:53:34 +02:00
Lasse Collin 421b0aa352 liblzma: Fix missing normalization in rc_encode_dummy().
Without this fix it could attempt to create too much output.
2021-01-14 20:57:11 +02:00
Lasse Collin 601ec0311e liblzma: Add EROFS LZMA encoder and decoder.
Right now this is just a planned extra-compact format for use
in the EROFS file system in Linux. At this point it's possible
that the format will either change or be abandoned and removed
completely.

The special thing about the encoder is that it uses the
output-size-limited encoding added in the previous commit.
EROFS uses fixed-sized blocks (e.g. 4 KiB) to hold compressed
data so the compressors must be able to create valid streams
that fill the given block size.
2021-01-14 20:10:59 +02:00
Lasse Collin 625f4c7c99 liblzma: Add rough support for output-size-limited encoding in LZMA1.
With this it is possible to encode LZMA1 data without EOPM so that
the encoder will encode as much input as it can without exceeding
the specified output size limit. The resulting LZMA1 stream will
be a normal LZMA1 stream without EOPM. The actual uncompressed size
will be available to the caller via the uncomp_size pointer.

One missing thing is that the LZMA layer doesn't inform the LZ layer
when the encoding is finished and thus the LZ may read more input
when it won't be used. However, this doesn't matter if encoding is
done with a single call (which is the planned use case for now).
For proper multi-call encoding this should be improved.

This commit only adds the functionality for internal use.
Nothing uses it yet.
2021-01-14 18:58:13 +02:00
Lasse Collin 9cdabbeea8 Scripts: Add zstd support to xzdiff. 2021-01-11 23:57:11 +02:00
Lasse Collin 074259f4f3 xz: Make --keep accept symlinks, hardlinks, and setuid/setgid/sticky.
Previously this required using --force but that has other
effects too which might be undesirable. Changing the behavior
of --keep has a small risk of breaking existing scripts but
since this is a fairly special corner case I expect the
likehood of breakage to be low enough.

I think the new behavior is more logical. The only reason for
the old behavior was to be consistent with gzip and bzip2.

Thanks to Vincent Lefevre and Sebastian Andrzej Siewior.
2021-01-11 23:41:16 +02:00
Lasse Collin 73c555b307 Scripts: Fix exit status of xzgrep.
Omit the -q option from xz, gzip, and bzip2. With xz this shouldn't
matter. With gzip it's important because -q makes gzip replace SIGPIPE
with exit status 2. With bzip2 it's important because with -q bzip2
is completely silent if input is corrupt while other decompressors
still give an error message.

Avoiding exit status 2 from gzip is important because bzip2 uses
exit status 2 to indicate corrupt input. Before this commit xzgrep
didn't recognize corrupt .bz2 files because xzgrep was treating
exit status 2 as SIGPIPE for gzip compatibility.

zstd still needs -q because otherwise it is noisy in normal
operation.

The code to detect real SIGPIPE didn't check if the exit status
was due to a signal (>= 128) and so could ignore some other exit
status too.
2021-01-11 23:28:52 +02:00
Lasse Collin 194029ffaf Scripts: Fix exit status of xzdiff/xzcmp.
This is a minor fix since this affects only the situation when
the files differ and the exit status is something else than 0.
In such case there could be SIGPIPE from a decompression tool
and that would result in exit status of 2 from xzdiff/xzcmp
while the correct behavior would be to return 1 or whatever
else diff or cmp may have returned.

This commit omits the -q option from xz/gzip/bzip2/lzop arguments.
I'm not sure why the -q was used in the first place, perhaps it
hides warnings in some situation that I cannot see at the moment.
Hopefully the removal won't introduce a new bug.

With gzip the -q option was harmful because it made gzip return 2
instead of >= 128 with SIGPIPE. Ignoring exit status 2 (warning
from gzip) isn't practical because bzip2 uses exit status 2 to
indicate corrupt input file. It's better if SIGPIPE results in
exit status >= 128.

With bzip2 the removal of -q seems to be good because with -q
it prints nothing if input is corrupt. The other tools aren't
silent in this situation even with -q. On the other hand, if
zstd support is added, it will need -q since otherwise it's
noisy in normal situations.

Thanks to Étienne Mollier and Sebastian Andrzej Siewior.
2021-01-11 22:58:58 +02:00
Lasse Collin f7fa309e1f liblzma: Make lzma_outq usable for threaded decompression too.
Before this commit all output queue buffers were allocated as
a single big allocation. Now each buffer is allocated separately
when needed. Used buffers are cached to avoid reallocation
overhead but the cache will keep only one buffer size at a time.
This should make things work OK in the decompression where most
of the time the buffer sizes will be the same but with some less
common files the buffer sizes may vary.

While this should work fine, it's still a bit preliminary
and may even get reverted if it turns out to be useless for
decompression.
2021-01-09 22:18:23 +02:00
H.J. Lu 4fd79b90c5 liblzma: Enable Intel CET in x86 CRC assembly codes
When Intel CET is enabled, we need to include <cet.h> in assembly codes
to mark Intel CET support and add _CET_ENDBR to indirect jump targets.

Tested on Intel Tiger Lake under CET enabled Linux.
2020-12-23 17:13:33 +02:00
Adam Borowski 1890351f34 Scripts: Add zstd support to xzgrep.
Thanks to Adam Borowski.
2020-12-05 22:39:03 +02:00
Lasse Collin 4575d9d365 xz: Avoid unneeded \f escapes on the man page.
I don't want to use \c in macro arguments but groff_man(7)
suggests that \f has better portability. \f would be needed
for the .TP strings for portability reasons anyway.

Thanks to Bjarni Ingi Gislason.
2020-11-01 22:34:25 +02:00
Lasse Collin 620b32f533 xz: Use non-breaking spaces when intentionally using more than one space.
This silences some style checker warnings. Seems that spaces
in the beginning of a line don't need this treatment.

Thanks to Bjarni Ingi Gislason.
2020-11-01 19:09:53 +02:00
Lasse Collin cb1f34988c xz: Protect the ellipsis (...) on the man page with \&.
This does it only when ... appears outside macro calls.

Thanks to Bjarni Ingi Gislason.
2020-11-01 18:53:25 +02:00
Lasse Collin 5d224da3da xz: Avoid the abbreviation "e.g." on the man page.
A few are simply omitted, most are converted to "for example"
and surrounded with commas. Sounds like that this is better
style, for example, man-pages(7) recommends avoiding such
abbreviations except in parenthesis.

Thanks to Bjarni Ingi Gislason.
2020-11-01 18:44:51 +02:00
Lasse Collin 90457dbe3e xz man page: Change \- (minus) to \(en (en-dash) for a numeric range.
Docs of ancient troff/nroff mention \(em (em-dash) but not \(en
and \- was used for both minus and en-dash. I don't know how
portable \(en is nowadays but it can be changed back if someone
complains. At least GNU groff and OpenBSD's mandoc support it.

Thanks to Bjarni Ingi Gislason for the patch.
2020-07-12 23:10:03 +03:00
Lasse Collin 352ba2d69a Windows: Fix building of resource files when config.h isn't used.
Now CMake + Visual Studio works for building liblzma.dll.

Thanks to Markus Rickert.
2020-07-12 20:46:24 +03:00
Lasse Collin a9e2a87f1d src/scripts/xzgrep.1: Filenames to xzgrep are optional.
xzgrep --help was correct already.
2020-04-06 19:34:48 +03:00
Bjarni Ingi Gislason a7ba275d9b src/script/xzgrep.1: Remove superfluous '.RB'
Output is from: test-groff -b -e -mandoc -T utf8 -rF0 -t -w w -z

  [ "test-groff" is a developmental version of "groff" ]

Input file is ./src/scripts/xzgrep.1

<src/scripts/xzgrep.1>:20 (macro RB): only 1 argument, but more are expected
<src/scripts/xzgrep.1>:23 (macro RB): only 1 argument, but more are expected
<src/scripts/xzgrep.1>:26 (macro RB): only 1 argument, but more are expected
<src/scripts/xzgrep.1>:29 (macro RB): only 1 argument, but more are expected
<src/scripts/xzgrep.1>:32 (macro RB): only 1 argument, but more are expected

 "abc..." does not mean the same as "abc ...".

  The output from nroff and troff is unchanged except for the space
between "file" and "...".

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
2020-04-06 19:29:15 +03:00
Bjarni Ingi Gislason 133d498db0 xzgrep.1: Delete superfluous '.PP'
Summary:

mandoc -T lint xzgrep.1 :
mandoc: xzgrep.1:79:2: WARNING: skipping paragraph macro: PP empty

  There is no change in the output of "nroff" and "troff".

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
2020-04-06 19:08:14 +03:00
Bjarni Ingi Gislason 057839ca98 src/xz/xz.1: Correct misused two-fonts macros
Output is from: test-groff -b -e -mandoc -T utf8 -rF0 -t -w w -z

  [ "test-groff" is a developmental version of "groff" ]

Input file is ./src/xz/xz.1

<src/xz/xz.1>:408 (macro BR): only 1 argument, but more are expected
<src/xz/xz.1>:1009 (macro BR): only 1 argument, but more are expected
<src/xz/xz.1>:1743 (macro BR): only 1 argument, but more are expected
<src/xz/xz.1>:1920 (macro BR): only 1 argument, but more are expected
<src/xz/xz.1>:2213 (macro BR): only 1 argument, but more are expected

  Output from nroff and troff is unchanged, except for a font change of a
full stop (.).

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
2020-04-06 19:08:04 +03:00
Lasse Collin b8e12f5ab4 Typo fixes from fossies.org.
https://fossies.org/linux/misc/xz-5.2.5.tar.xz/codespell.html
2020-03-23 18:07:50 +02:00
Lasse Collin 7812002dd3 xz: Never use thousand separators in DJGPP builds.
DJGPP 2.05 added support for thousands separators but it's
broken at least under WinXP with Finnish locale that uses
a non-breaking space as the thousands separator. Workaround
by disabling thousands separators for DJGPP builds.
2020-03-11 21:15:35 +02:00
Lasse Collin 4572d53e16 liblzma: Fix a comment and RC_SYMBOLS_MAX.
The comment didn't match the value of RC_SYMBOLS_MAX and the value
itself was slightly larger than actually needed. The only harm
about this was that memory usage was a few bytes larger.
2020-03-02 13:54:33 +02:00
Lasse Collin b3ed19a55f liblzma: Remove unneeded <sys/types.h> from fastpos_tablegen.c.
This file only generates fastpos_table.c.
It isn't built as a part of liblzma.
2020-02-24 23:23:18 +02:00
Lasse Collin 7b8982b291 Use defined(__GNUC__) before __GNUC__ in preprocessor lines.
This should silence the equivalent of -Wundef in compilers that
don't define __GNUC__.
2020-02-22 14:15:07 +02:00
Lasse Collin 43dfe04e62 liblzma: Add more uses of lzma_memcmplen() to the normal mode of LZMA.
This gives a tiny encoder speed improvement. This could have been done
in 2014 after the commit 544aaa3d13 but
it was forgotten.
2020-02-21 17:40:02 +02:00
Lasse Collin 7fe3ef2eaa xz: Silence a warning when sig_atomic_t is long int.
It can be true at least on z/OS.
2020-02-21 16:10:44 +02:00
Lasse Collin b0a2a77d10 xz: Avoid unneeded access of a volatile variable. 2020-02-21 15:59:26 +02:00
Lasse Collin 57360bb4fd tuklib_exit: Add missing header.
strerror() needs <string.h> which happened to be included via
tuklib_common.h -> tuklib_config.h -> sysdefs.h if HAVE_CONFIG_H
was defined. This wasn't tested without config.h before so it
had worked fine.
2020-02-20 18:54:04 +02:00
Lasse Collin fddd31175e Revert the previous commit and add a comment.
The previous commit broke crc32_tablegen.c.

If the whole package is built without config.h (with defines
set on the compiler command line) this should still work fine
as long as these headers conform to C99 well enough.
2020-02-18 19:12:35 +02:00
Lasse Collin 4e4e9fbb7e Do not check for HAVE_CONFIG_H in tuklib_config.h.
In XZ Utils sysdefs.h takes care of it and the required headers.
2020-02-17 23:37:20 +02:00
Lasse Collin 2d4cef954f sysdefs.h: Omit the conditionals around string.h and limits.h.
string.h is used unconditionally elsewhere in the project and
configure has always stopped if limits.h is missing, so these
headers must have been always available even on the weirdest
systems.
2020-02-16 12:24:13 +02:00
Lasse Collin 6f7211b6bb Build: Add support for translated man pages using po4a.
The dependency on po4a is optional. It's never required to install
the translated man pages when xz is built from a release tarball.
If po4a is missing when building from xz.git, the translated man
pages won't be generated but otherwise the build will work normally.

The translations are only updated automatically by autogen.sh and
by "make mydist". This makes it easy to keep po4a as an optional
dependency and ensures that I won't forget to put updated
translations to a release tarball.

The translated man pages aren't installed if --disable-nls is used.

The installation of translated man pages abuses Automake internals
by calling "install-man" with redefined dist_man_MANS and man_MANS.
This makes the hairy script code slightly less hairy. If it breaks
some day, this code needs to be fixed; don't blame Automake developers.

Also, this adds more quotes to the existing shell script code in
the Makefile.am "-hook"s.
2020-02-07 15:32:21 +02:00
Lasse Collin 15a133b6d1 xz: Make it a fatal error if enabling the sandbox fails.
Perhaps it's too drastic but on the other hand it will let me
learn about possible problems if people report the errors.
This won't be backported to the v5.2 branch.
2020-02-05 20:40:14 +02:00
Lasse Collin af0fb386ef xz: Comment out annoying sandboxing messages. 2020-02-05 20:33:50 +02:00
Lasse Collin 3539705108 xz: Limit --memlimit-compress to at most 4020 MiB for 32-bit xz.
See the code comment for reasoning. It's far from perfect but
hopefully good enough for certain cases while hopefully doing
nothing bad in other situations.

At presets -5 ... -9, 4020 MiB vs. 4096 MiB makes no difference
on how xz scales down the number of threads.

The limit has to be a few MiB below 4096 MiB because otherwise
things like "xz --lzma2=dict=500MiB" won't scale down the dict
size enough and xz cannot allocate enough memory. With
"ulimit -v $((4096 * 1024))" on x86-64, the limit in xz had
to be no more than 4085 MiB. Some safety margin is good though.

This is hack but it should be useful when running 32-bit xz on
a 64-bit kernel that gives full 4 GiB address space to xz.
Hopefully this is enough to solve this:

https://bugzilla.redhat.com/show_bug.cgi?id=1196786

FreeBSD has a patch that limits the result in tuklib_physmem()
to SIZE_MAX on 32-bit systems. While I think it's not the way
to do it, the results on --memlimit-compress have been good. This
commit should achieve practically identical results for compression
while leaving decompression and tuklib_physmem() and thus
lzma_physmem() unaffected.
2020-02-01 19:56:18 +02:00
Lasse Collin ba76d67585 xz: Set the --flush-timeout deadline when the first input byte arrives.
xz --flush-timeout=2000, old version:

  1. xz is started. The next flush will happen after two seconds.
  2. No input for one second.
  3. A burst of a few kilobytes of input.
  4. No input for one second.
  5. Two seconds have passed and flushing starts.

The first second counted towards the flush-timeout even though
there was no pending data. This can cause flushing to occur more
often than needed.

xz --flush-timeout=2000, after this commit:

  1. xz is started.
  2. No input for one second.
  3. A burst of a few kilobytes of input. The next flush will
     happen after two seconds counted from the time when the
     first bytes of the burst were read.
  4. No input for one second.
  5. No input for another second.
  6. Two seconds have passed and flushing starts.
2020-01-26 20:53:25 +02:00
Lasse Collin fd47fd62bb xz: Move flush_needed from mytime.h to file_pair struct in file_io.h. 2020-01-26 20:25:52 +02:00
Lasse Collin 8150356810 xz: coder.c: Make writing output a separate function.
The same code sequence repeats so it's nicer as a separate function.
Note that in one case there was no test for opt_mode != MODE_TEST,
but that was only because that condition would always be true, so
this commit doesn't change the behavior there.
2020-01-26 14:49:22 +02:00
Lasse Collin 5a49e081a0 xz: Fix semi-busy-waiting in xz --flush-timeout.
When input blocked, xz --flush-timeout=1 would wake up every
millisecond and initiate flushing which would have nothing to
flush and thus would just waste CPU time. The fix disables the
timeout when no input has been seen since the previous flush.
2020-01-26 14:13:42 +02:00
Lasse Collin dcca70fe9f xz: Refactor io_read() a bit. 2020-01-26 13:47:31 +02:00
Lasse Collin 4ae9ab70cd xz: Update a comment in file_io.h. 2020-01-26 13:37:08 +02:00
Lasse Collin 3333ba4a67 xz: Move the setting of flush_needed in file_io.c to a nicer location. 2020-01-26 13:27:51 +02:00
Lasse Collin 7136f1735c Rename unaligned_read32ne to read32ne, and similarly for the others. 2019-12-31 00:47:49 +02:00
Lasse Collin 5e78fcbf2e Rename read32ne to aligned_read32ne, and similarly for the others.
Using the aligned methods requires more care to ensure that
the address really is aligned, so it's nicer if the aligned
methods are prefixed. The next commit will remove the unaligned_
prefix from the unaligned methods which in liblzma are used in
more places than the aligned ones.
2019-12-31 00:29:48 +02:00
Lasse Collin 77bc5bc6dd Revise tuklib_integer.h and .m4.
Add a configure option --enable-unsafe-type-punning to get the
old non-conforming memory access methods. It can be useful with
old compilers or in some other less typical situations but
shouldn't normally be used.

Omit the packed struct trick for unaligned access. While it's
best in some cases, this is simpler. If the memcpy trick doesn't
work, one can request unsafe type punning from configure.

Because CRC32/CRC64 code needs fast aligned reads, if no very
safe way to do it is found, type punning is used as a fallback.
This sucks but since it currently works in practice, it seems to
be the least bad option. It's never needed with GCC >= 4.7 or
Clang >= 3.6 since these support __builtin_assume_aligned and
thus fast aligned access can be done with the memcpy trick.

Other things:
  - Support GCC/Clang __builtin_bswapXX
  - Cleaner bswap fallback macros
  - Minor cleanups
2019-12-31 00:18:24 +02:00
Lasse Collin 43ce4ea7c7 Scripts: Put /usr/xpg4/bin to the beginning of PATH on Solaris.
This adds a configure option --enable-path-for-scripts=PREFIX
which defaults to empty except on Solaris it is /usr/xpg4/bin
to make POSIX grep and others available. The Solaris case had
been documented in INSTALL with a manual fix but it's better
to do this automatically since it is needed on most Solaris
systems anyway.

Thanks to Daniel Richard G.
2019-09-24 23:02:40 +03:00
Lasse Collin 6a89e656eb Fix comment typos in tuklib_mbstr* files. 2019-07-12 18:57:43 +03:00
Lasse Collin ac0b421265 Add missing include to tuklib_mbstr_width.c.
It didn't matter in XZ Utils because sysdefs.h
includes string.h anyway.
2019-07-12 18:30:46 +03:00
Lasse Collin 72a443281f Update tuklib base headers to include stdbool.h. 2019-07-12 18:10:57 +03:00
Lasse Collin de1f47b2b4 xz: Automatically align the strings in --info-memory.
This makes it easier to translate the strings.

Also, the string for amount of RAM was shortened.
2019-06-28 00:54:31 +03:00
Lasse Collin 8ce679125d liblzma: Fix a buggy comment. 2019-06-25 23:15:21 +03:00
Lasse Collin d499e467d9 liblzma: Add a comment. 2019-06-24 23:52:17 +03:00
Lasse Collin a12b13c5f0 liblzma: Silence clang -Wmissing-variable-declarations. 2019-06-24 23:45:21 +03:00
Lasse Collin 1b4675cebf Add LZMA_RET_INTERNAL1..8 to lzma_ret and use one for LZMA_TIMED_OUT.
LZMA_TIMED_OUT is *internally* used as a value for lzma_ret
enumeration. Previously it was #defined to 32 and cast to lzma_ret.
That way it wasn't visible in the public API, but this was hackish.

Now the public API has eight LZMA_RET_INTERNALx members and
LZMA_TIMED_OUT is #defined to LZMA_RET_INTERNAL1. This way
the code is cleaner overall although the public API has a few
extra mysterious enum members.
2019-06-24 23:25:41 +03:00
Lasse Collin 159c43875e xz: Silence a warning from clang -Wsign-conversion in main.c. 2019-06-24 22:57:43 +03:00
Lasse Collin 466cfcd3e5 xz: Make "headings" static in list.c.
Caught by clang -Wmissing-variable-declarations.
2019-06-24 22:52:20 +03:00
Lasse Collin 608517b9b7 liblzma: Remove incorrect uses of lzma_attribute((__unused__)).
Caught by clang -Wused-but-marked-unused.
2019-06-24 22:50:36 +03:00
Lasse Collin 2402f7873d xz: Fix an integer overflow with 32-bit off_t.
Or any off_t which isn't very big (like signed 64 bit integer
that most system have). A small off_t could overflow if the
file being decompressed had long enough run of zero bytes,
which would result in corrupt output.
2019-06-24 20:45:49 +03:00
Lasse Collin 4fd3a8dd0b xz: Cleanup io_seek_src() a bit.
lseek() returns -1 on error and checking for -1 is nicer.
2019-06-24 01:24:17 +03:00
Lasse Collin 1d4a904d8f xz: Change io_seek_src and io_pread arguments from off_t to uint64_t.
This helps fixing warnings from -Wsign-conversion and makes the
code look better too.
2019-06-24 00:40:45 +03:00
Lasse Collin 50120deb01 xz: list.c: Fix some warnings from -Wsign-conversion. 2019-06-24 00:12:38 +03:00
Lasse Collin d0a78751eb tuklib_mbstr_width: Fix a warning from -Wsign-conversion. 2019-06-23 23:22:45 +03:00
Lasse Collin 7883d73530 xz: Fix some of the warnings from -Wsign-conversion. 2019-06-23 23:19:34 +03:00
Lasse Collin c2b994fe3d tuklib_cpucores: Silence warnings from -Wsign-conversion. 2019-06-23 22:27:45 +03:00
Lasse Collin 07c4fa9e1a xzdec: Fix warnings from -Wsign-conversion. 2019-06-23 21:40:47 +03:00
Lasse Collin dfac2c9a1d liblzma: Fix warnings from -Wsign-conversion.
Also, more parentheses were added to the literal_subcoder
macro in lzma_comon.h (better style but no functional change
in the current usage).
2019-06-23 21:38:56 +03:00
Lasse Collin 41838dcc26 tuklib_integer: Silence warnings from -Wsign-conversion. 2019-06-23 19:33:55 +03:00