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2024-01-19liblzma: Update website URL.Jia Tan1-3/+3
2024-01-11liblzma: CRC: Add a comment to crc_x86_clmul.h about BUILDING_ macros.Lasse Collin1-0/+6
2024-01-11liblzma: CRC: Remove crc_always_inline, use lzma_always_inline instead.Lasse Collin2-21/+1
Now crc_simd_body() in crc_x86_clmul.h is only called once in a translation unit, we no longer need to be so cautious about ensuring the always-inline behavior.
2024-01-11liblzma: CRC: Update CLMUL comments to more generic wording.Lasse Collin2-13/+13
2024-01-11liblzma: Rename arch-specific CRC functions and macros.Lasse Collin4-25/+31
CRC_CLMUL was split to CRC_ARCH_OPTIMIZED and CRC_X86_CLMUL. CRC_ARCH_OPTIMIZED is defined when an arch-optimized version is used. Currently the x86 CLMUL implementations are the only arch-optimized versions, and these also use the CRC_x86_CLMUL macro to tell when crc_x86_clmul.h needs to be included. is_clmul_supported() was renamed to is_arch_extension_supported(). crc32_clmul() and crc64_clmul() were renamed to crc32_arch_optimized() and crc64_arch_optimized(). This way the names make sense with arch-specific non-CLMUL implementations as well.
2024-01-11liblzma: Fix a comment in crc_common.h.Lasse Collin1-1/+2
2024-01-11liblzma: Avoid extern lzma_crc32_clmul() and lzma_crc64_clmul().Lasse Collin5-85/+89
A CLMUL-only build will have the crcxx_clmul() inlined into lzma_crcxx(). Previously a jump to the extern lzma_crcxx_clmul() was needed. Notes about shared liblzma on ELF platforms: - On platforms that support ifunc and -fvisibility=hidden, this was silly because CLMUL-only build would have that single extra jump instruction of extra overhead. - On platforms that support neither -fvisibility=hidden nor linker version script (liblzma*.map), jumping to lzma_crcxx_clmul() would go via PLT so a few more instructions of overhead (still not a big issue but silly nevertheless). There was a downside with static liblzma too: if an application only needs lzma_crc64(), static linking would make the linker include the CLMUL code for both CRC32 and CRC64 from crc_x86_clmul.o even though the CRC32 code wouldn't be needed, thus increasing code size of the executable (assuming that -ffunction-sections isn't used). Also, now compilers are likely to inline crc_simd_body() even if they don't support the always_inline attribute (or MSVC's __forceinline). Quite possibly all compilers that build the code do support such an attribute. But now it likely isn't a problem even if the attribute wasn't supported. Now all x86-specific stuff is in crc_x86_clmul.h. If other archs The other archs can then have their own headers with their own is_clmul_supported() and crcxx_clmul(). Another bonus is that the build system doesn't need to care if crc_clmul.c is needed. is_clmul_supported() stays as inline function as it's not needed when doing a CLMUL-only build (avoids a warning about unused function).
2024-01-11liblzma: crc_clmul.c: Add crc_attr_target macro.Lasse Collin1-14/+16
This reduces the number of the complex #if directives.
2024-01-11liblzma: Simplify existing cases with lzma_attr_no_sanitize_address.Lasse Collin1-9/+3
2024-01-11liblzma: #define crc_attr_no_sanitize_address in crc_common.h.Lasse Collin1-0/+10
2024-01-10liblzma: CRC: Add empty lines.Lasse Collin3-1/+5
And remove one too.
2024-01-10liblzma: crc_clmul.c: Tidy up the location of MSVC pragma.Lasse Collin1-2/+2
It makes no difference in practice.
2023-12-28liblzma: Use 8-byte method in memcmplen.h on ARM64.Lasse Collin1-8/+10
It requires fast unaligned access to 64-bit integers and a fast instruction to count leading zeros in a 64-bit integer (__builtin_ctzll()). This perhaps should be enabled on some other archs too. Thanks to Chenxi Mao for the original patch: https://github.com/tukaani-project/xz/pull/75 (the first commit) According to the numbers there, this may improve encoding speed by about 3-5 %. This enables the 8-byte method on MSVC ARM64 too which should work but wasn't tested.
2023-12-28liblzma: Check also for __clang__ in memcmplen.h.Lasse Collin1-1/+2
This change hopefully makes no practical difference as Clang likely was detected via __GNUC__ or _MSC_VER already.
2023-12-20liblzma: Initialize lzma_lz_encoder pointers with NULL.Jia Tan1-1/+5
This fixes the recent change to lzma_lz_encoder that used memzero instead of the NULL constant. On some compilers the NULL constant (always 0) may not equal the NULL pointer (this only needs to guarentee to not point to valid memory address). Later code compares the pointers to the NULL pointer so we must initialize them with the NULL pointer instead of 0 to guarentee code correctness.
2023-12-16liblzma: Set all values in lzma_lz_encoder to NULL after allocation.Jia Tan1-3/+1
The first member of lzma_lz_encoder doesn't necessarily need to be set to NULL since it will always be set before anything tries to use it. However the function pointer members must be set to NULL since other functions rely on this NULL value to determine if this behavior is supported or not. This fixes a somewhat serious bug, where the options_update() and set_out_limit() function pointers are not set to NULL. This seems to have been forgotten since these function pointers were added many years after the original two (code() and end()). The problem is that by not setting this to NULL we are relying on the memory allocation to zero things out if lzma_filters_update() is called on a LZMA1 encoder. The function pointer for set_out_limit() is less serious because there is not an API function that could call this in an incorrect way. set_out_limit() is only called by the MicroLZMA encoder, which must use LZMA1 where set_out_limit() is always set. Its currently not possible to call set_out_limit() on an LZMA2 encoder at this time. So calling lzma_filters_update() on an LZMA1 encoder had undefined behavior since its possible that memory could be manipulated so the options_update member pointed to a different instruction sequence. This is unlikely to be a bug in an existing application since it relies on calling lzma_filters_update() on an LZMA1 encoder in the first place. For instance, it does not affect xz because lzma_filters_update() can only be used when encoding to the .xz format. This is fixed by using memzero() to set all members of lzma_lz_encoder to NULL after it is allocated. This ensures this mistake will not occur here in the future if any additional function pointers are added.
2023-12-16liblzma: Tweak a comment.Jia Tan1-1/+1
2023-12-16liblzma: Make parameter names in function definition match declaration.Jia Tan1-4/+4
lzma_raw_encoder() and lzma_raw_encoder_init() used "options" as the parameter name instead of "filters" (used by the declaration). "filters" is more clear since the parameter represents the list of filters passed to the raw encoder, each of which contains filter options.
2023-12-16liblzma: Improve lzma encoder init function consistency.Jia Tan1-0/+3
lzma_encoder_init() did not check for NULL options, but lzma2_encoder_init() did. This is more of a code style improvement than anything else to help make lzma_encoder_init() and lzma2_encoder_init() more similar.
2023-11-09liblzma: Add missing comments to lz_encoder.h.Jia Tan1-1/+5
2023-10-31liblzma: Fix compilation of fastpos_tablegen.c.Lasse Collin1-0/+2
The macro lzma_attr_visibility_hidden has to be defined to make fastpos.h usable. The visibility attribute is irrelevant to fastpos_tablegen.c so simply #define the macro to an empty value. fastpos_tablegen.c is never built by the included build systems and so the problem wasn't noticed earlier. It's just a standalone program for generating fastpos_table.c. Fixes: https://github.com/tukaani-project/xz/pull/69 Thanks to GitHub user Jamaika1.
2023-10-30liblzma: Add a note why crc_always_inline exists for now.Lasse Collin1-0/+5
Solaris Studio is a possible example (not tested) which supports the always_inline attribute but might not get detected by the common.h #ifdefs.
2023-10-30liblzma: Use lzma_always_inline in memcmplen.h.Lasse Collin1-2/+1
2023-10-30liblzma: #define lzma_always_inline in common.h.Lasse Collin1-0/+17
2023-10-30liblzma: Use lzma_attr_visibility_hidden on private extern declarations.Lasse Collin5-0/+13
These variables are internal to liblzma and not exposed in the API.
2023-10-30liblzma: #define lzma_attr_visibility_hidden in common.h.Lasse Collin1-0/+11
In ELF shared libs: -fvisibility=hidden affects definitions of symbols but not declarations.[*] This doesn't affect direct calls to functions inside liblzma as a linker can replace a call to lzma_foo@plt with a call directly to lzma_foo when -fvisibility=hidden is used. [*] It has to be like this because otherwise every installed header file would need to explictly set the symbol visibility to default. When accessing extern variables that aren't defined in the same translation unit, compiler assumes that the variable has the default visibility and thus indirection is needed. Unlike function calls, linker cannot optimize this. Using __attribute__((__visibility__("hidden"))) with the extern variable declarations tells the compiler that indirection isn't needed because the definition is in the same shared library. About 15+ years ago, someone told me that it would be good if the CRC tables would be defined in the same translation unit as the C code of the CRC functions. While I understood that it could help a tiny amount, I didn't want to change the code because a separate translation unit for the CRC tables was needed for the x86 assembly code anyway. But when visibility attributes are supported, simply marking the extern declaration with the hidden attribute will get identical result. When there are only a few affected variables, this is trivial to do. I wish I had understood this back then already.
2023-10-26liblzma: Refer to MinGW-w64 instead of MinGW in the API headers.Lasse Collin2-3/+3
MinGW (formely a MinGW.org Project, later the MinGW.OSDN Project at <https://osdn.net/projects/mingw/>) has GCC 9.2.0 as the most recent GCC package (released 2021-02-02). The project might still be alive but majority of people have switched to MinGW-w64. Thus it seems clearer to refer to MinGW-w64 in our API headers too. Building with MinGW is likely to still work but I haven't tested it in the recent years.
2023-10-26liblzma: Add Cflags.private to liblzma.pc.in for MSYS2.Lasse Collin1-0/+1
It properly adds -DLZMA_API_STATIC when compiling code that will be linked against static liblzma. Having it there on systems other than Windows does no harm. See: https://www.msys2.org/docs/pkgconfig/
2023-10-21liblzma: Move is_clmul_supported() back to crc_common.h.Jia Tan4-50/+51
This partially reverts creating crc_clmul.c (8c0f9376f58c0696d5d6719705164d35542dd891) where is_clmul_supported() was moved, extern'ed, and renamed to lzma_is_clmul_supported(). This caused a problem when the function call to lzma_is_clmul_supported() results in a call through the PLT. ifunc resolvers run very early in the dynamic loading sequence, so the PLT may not be setup properly at this point. Whether the PLT is used or not for lzma_is_clmul_supported() depened upon the compiler-toolchain used and flags. In liblzma compiled with GCC, for instance, GCC will go through the PLT for function calls internal to liblzma if the version scripts and symbol visibility hiding are not used. If lazy-binding is disabled, then it would have made any program linked with liblzma fail during dynamic loading in the ifunc resolver.
2023-10-19Build: Remove check for COND_CHECK_CRC32 in check/Makefile.inc.Jia Tan1-2/+2
Currently crc32 is always enabled, so COND_CHECK_CRC32 must always be set. Because of this, it makes the recent change to conditionally compile check/crc_clmul.c appear wrong since that file has CLMUL implementations for both CRC32 and CRC64.
2023-10-19liblzma: Fix -fsanitize=address failure with crc_clmul functions.Jia Tan1-0/+6
After forcing crc_simd_body() to always be inlined it caused -fsanitize=address to fail for lzma_crc32_clmul() and lzma_crc64_clmul(). The __no_sanitize_address__ attribute was added to lzma_crc32_clmul() and lzma_crc64_clmul(), but not removed from crc_simd_body(). ASAN and inline functions behavior has changed over the years for GCC specifically, so while strictly required we will keep __attribute__((__no_sanitize_address__)) on crc_simd_body() in case this becomes a requirement in the future. Older GCC versions refuse to inline a function with ASAN if the caller and callee do not agree on sanitization flags (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89124#c3). If the function was forced to be inlined, it will not compile if the callee function has __no_sanitize_address__ but the caller doesn't.
2023-10-18liblzma: Set the MSVC optimization fix to only cover lzma_crc64_clmul().Jia Tan1-15/+15
After testing a 32-bit Release build on MSVC, only lzma_crc64_clmul() has the bug. crc_simd_body() and lzma_crc32_clmul() do not need the optimizations disabled.
2023-10-18liblzma: CRC_USE_GENERIC_FOR_SMALL_INPUTS cannot be used with ifunc.Lasse Collin1-1/+3
2023-10-18liblzma: Include common.h in crc_common.h.Lasse Collin2-1/+3
crc_common.h depends on common.h. The headers include common.h except when there is a reason to not do so.
2023-10-18liblzma: Add include guards to crc_common.h.Jia Tan1-0/+5
2023-10-18liblzma: Add the crc_always_inline macro to crc_simd_body().Jia Tan1-1/+1
Forcing this to be inline has a significant speed improvement at the cost of a few repeated instructions. The compilers tested on did not inline this function since it is large and is used twice in the same translation unit.
2023-10-18liblzma: Create crc_always_inline macro.Jia Tan1-0/+15
This macro must be used instead of the inline keyword. On MSVC, it is a replacement for __forceinline which is an MSVC specific keyword that should not be used with inline (it will issue a warning if it is). It does not use a build system check to determine if __attribute__((__always_inline__)) since all compilers that can use CLMUL extensions (except the special case for MSVC) should support this attribute. If this assumption is incorrect then it will result in a bug report instead of silently producing slow code.
2023-10-18liblzma: Refactor CRC comments.Jia Tan2-72/+53
A detailed description of the three dispatch methods was added. Also, duplicated comments now only appear in crc32_fast.c or were removed from both crc32_fast.c and crc64_fast.c if they appeared in crc_clmul.c.
2023-10-18liblzma: Create crc_clmul.c.Jia Tan5-420/+435
Both crc32_clmul() and crc64_clmul() are now exported from crc32_clmul.c as lzma_crc32_clmul() and lzma_crc64_clmul(). This ensures that is_clmul_supported() (now lzma_is_clmul_supported()) is not duplicated between crc32_fast.c and crc64_fast.c. Also, it encapsulates the complexity of the CLMUL implementations into a single file and reduces the complexity of crc32_fast.c and crc64_fast.c. Before, CLMUL code was present in crc32_fast.c, crc64_fast.c, and crc_common.h. During the conversion, various cleanups were applied to code (thanks to Lasse Collin) including: - Require using semicolons with MASK_/L/H/LH macros. - Variable typing and const handling improvements. - Improvements to comments. - Fixes to the pragmas used. - Removed unneeded variables. - Whitespace improvements. - Fixed CRC_USE_GENERIC_FOR_SMALL_INPUTS handling. - Silenced warnings and removed the need for some #pragmas
2023-10-18liblzma: Define CRC_USE_IFUNC in crc_common.h.Jia Tan3-4/+7
When ifunc is supported, we can define a simpler macro instead of repeating the more complex check in both crc32_fast.c and crc64_fast.c.
2023-10-13liblzma: Added crc32_clmul to crc32_fast.c.Hans Jansen2-11/+255
2023-10-13liblzma: Moved CLMUL CRC logic to crc_common.h.Hans Jansen2-247/+240
crc64_fast.c was updated to use the code from crc_common.h instead.
2023-10-13liblzma: Rename crc_macros.h to crc_common.h.Hans Jansen4-4/+4
2023-09-26liblzma: Update a comment.Lasse Collin1-2/+1
The C standards don't allow an empty translation unit which can be avoided by declaring something, without exporting any symbols. When I committed f644473a211394447824ea00518d0a214ff3f7f2 I had a feeling that some specific toolchain somewhere didn't like empty object files (assembler or maybe "ar" complained) but I cannot find anything to confirm this now. Quite likely I remembered nonsense. I leave this here as a note to my future self. :-)
2023-09-27liblzma: Avoid compiler warning without creating extra symbol.Jia Tan1-2/+1
When the generic fast crc64 method is used, then we omit lzma_crc64_table[][]. Similar to d9166b52cf3458a4da3eb92224837ca8fc208d79, we can avoid compiler warnings with -Wempty-translation-unit (Clang) or -pedantic (GCC) by creating a never used typedef instead of an extra symbol.
2023-09-24liblzma: Change quoting style from `...' to '...'.Jia Tan7-24/+24
This was done for both internal and API headers.
2023-09-22liblzma: Move a few __attribute__ uses in function declarations.Lasse Collin3-7/+10
The API headers have many attributes but these were left as is for now.
2023-09-22Remove incorrect uses of __attribute__((__malloc__)).Lasse Collin2-4/+4
xrealloc() is obviously incorrect, modern GCC docs even mention realloc() as an example where this attribute cannot be used. liblzma's lzma_alloc() and lzma_alloc_zero() would be correct uses most of the time but custom allocators may use a memory pool or otherwise hold the pointer so aliasing issues could happen in theory. The xstrdup() case likely was correct but I removed it anyway. Now there are no __malloc__ attributes left in the code. The allocations aren't in hot paths so this should make no practical difference.
2023-09-14liblzma: Mark crc64_clmul() with __attribute__((__no_sanitize_address__)).Lasse Collin1-0/+8
Thanks to Agostino Sarubbo. Fixes: https://github.com/tukaani-project/xz/issues/62
2023-08-28liblzma: Update assert in vli_ceil4().Jia Tan1-1/+1
The argument to vli_ceil4() should always guarantee the return value is also a valid lzma_vli. Thus the highest three valid lzma_vli values are invalid arguments. All uses of the function ensure this so the assert is updated to match this.
2023-08-28liblzma: Add overflow check for Unpadded size in lzma_index_append().Jia Tan1-0/+6
This was not a security bug since there was no path to overflow UINT64_MAX in lzma_index_append() or when it calls index_file_size(). The bug was discovered by a failing assert() in vli_ceil4() when called from index_file_size() when unpadded_sum (the sum of the compressed size of current Stream and the unpadded_size parameter) exceeds LZMA_VLI_MAX. Previously, the unpadded_size parameter was checked to be not greater than UNPADDED_SIZE_MAX, but no check was done once compressed_base was added. This could not have caused an integer overflow in index_file_size() when called by lzma_index_append(). The calculation for file_size breaks down into the sum of: - Compressed base from all previous Streams - 2 * LZMA_STREAM_HEADER_SIZE (size of the current Streams header and footer) - stream_padding (can be set by lzma_index_stream_padding()) - Compressed base from the current Stream - Unpadded size (parameter to lzma_index_append()) The sum of everything except for Unpadded size must be less than LZMA_VLI_MAX. This is guarenteed by overflow checks in the functions that can set these values including lzma_index_stream_padding(), lzma_index_append(), and lzma_index_cat(). The maximum value for Unpadded size is enforced by lzma_index_append() to be less than or equal UNPADDED_SIZE_MAX. Thus, the sum cannot exceed UINT64_MAX since LZMA_VLI_MAX is half of UINT64_MAX. Thanks to Joona Kannisto for reporting this.
2023-07-31Docs: Fix typos found by codespellDimitri Papadopoulos Orfanos11-19/+19
2023-07-24liblzma: Prevent an empty translation unit in Windows builds.Jia Tan1-1/+5
To workaround Automake lacking Windows resource compiler support, an empty source file is compiled to overwrite the resource files for static library builds. Translation units without an external declaration are not allowed by the C standard and result in a warning when used with -Wempty-translation-unit (Clang) or -pedantic (GCC).
2023-07-19liblzma: Suppress -Wunused-function warning.Jia Tan1-0/+10
Clang 16.0.0 and earlier have a bug that the ifunc resolver function triggers the -Wunused-function warning. The resolver function is static and only "used" by the __attribute__((__ifunc()__)). At this time, the bug is still unresolved, but has been reported: https://github.com/llvm/llvm-project/issues/63957 This is not a problem in GCC.
2023-07-18liblzma: Reword lzma_str_list_filters() documentation.Jia Tan1-1/+1
This further improves the documentation from commit f36ca7982f6bd5e9827219ed4f3c5a1fbf5d7bdf. The previous wording of "supported options" was slightly misleading since the options that are printed are the ones that are relevant for encoding/decoding. It is not about which options can or must be specified.
2023-07-18liblzma: Improve comment in string_conversion.c.Jia Tan1-2/+2
The comment used "flag" when referring to decoder options. Just referring to them as options is more clear and consistent.
2023-07-18liblzma: Tweak #if condition in memcmplen.h.Lasse Collin1-2/+2
Maybe ICC always #defines _MSC_VER on Windows but now it's very clear which code will get used.
2023-07-18liblzma: Omit unnecessary parenthesis in a preprocessor directive.Lasse Collin1-2/+2
2023-07-08liblzma: Remove non-portable empty initializer.Jia Tan1-1/+1
Commit 78704f36e74205857c898a351c757719a6c8b666 added an empty initializer {} to prevent a warning. The empty initializer is a GNU extension and results in a build failure on MSVC. The -wpedantic flag warns about empty initializers.
2023-06-29liblzma: Prevent uninitialzed warning in mt stream encoder.Jia Tan1-1/+1
This change only impacts the compiler warning since it was impossible for the wait_abs struct in stream_encode_mt() to be used before it was initialized since mythread_condtime_set() will always be called before mythread_cond_timedwait(). Since the mythread.h code is different between the POSIX and Windows versions, this warning was only present on Windows builds. Thanks to Arthur S for reporting the warning and providing an initial patch.
2023-06-28liblzma: Prevent warning for MSYS2 Windows build.Jia Tan1-2/+4
In lzma_memcmplen(), the <intrin.h> header file is only included if _MSC_VER and _M_X64 are both defined but _BitScanForward64() was previously used if _M_X64 was defined. GCC for MSYS2 defines _M_X64 but not _MSC_VER so _BitScanForward64() was used without including <intrin.h>. Now, lzma_memcmplen() will use __builtin_ctzll() for MSYS2 GCC builds as expected.
2023-06-27liblzma: Add ifunc implementation to crc64_fast.c.Lasse Collin1-9/+26
The ifunc method avoids indirection via the function pointer crc64_func. This works on GNU/Linux and probably on FreeBSD too. The previous __attribute((__constructor__)) method is kept for compatibility with ELF platforms which do support ifunc. The ifunc method has some limitations, for example, building liblzma with -fsanitize=address will result in segfaults. The configure option --disable-ifunc must be used for such builds. Thanks to Hans Jansen for the original patch. Closes: https://github.com/tukaani-project/xz/pull/53
2023-05-13liblzma: Slightly rewords lzma_str_list_filters() documentation.Jia Tan1-1/+1
Reword "options required" to "supported options". The previous may have suggested that the options listed were all required anytime a filter is used for encoding or decoding. The reword makes this more clear that adjusting the options is optional.
2023-05-12liblzma: Adds lzma_nothrow to MicroLZMA API functions.Jia Tan1-2/+3
None of the liblzma functions may throw an exception, so this attribute should be applied to all liblzma API functions.
2023-05-11liblzma: Exports lzma_mt_block_size() as an API function.Jia Tan7-22/+61
The lzma_mt_block_size() was previously just an internal function for the multithreaded .xz encoder. It is used to provide a recommended Block size for a given filter chain. This function is helpful to determine the maximum Block size for the multithreaded .xz encoder when one wants to change the filters between blocks. Then, this determined Block size can be provided to lzma_stream_encoder_mt() in the lzma_mt options parameter when intializing the coder. This requires one to know all the filter chains they are using before starting to encode (or at least the filter chain that will need the largest Block size), but that isn't a bad limitation.
2023-05-11liblzma: Creates IS_ENC_DICT_SIZE_VALID() macro.Jia Tan2-3/+9
This creates an internal liblzma macro to test if the dictionary size is valid for encoding.
2023-04-19Windows: Include <intrin.h> when needed.Jia Tan1-0/+10
Legacy Windows did not need to #include <intrin.h> to use the MSVC intrinsics. Newer versions likely just issue a warning, but the MSVC documentation says to include the header file for the intrinsics we use. GCC and Clang can "pretend" to be MSVC on Windows, so extra checks are needed in tuklib_integer.h to only include <intrin.h> when it will is actually needed.
2023-04-14liblzma: Update project maintainers in lzma.h.Lasse Collin1-1/+1
AUTHORS was updated earlier, lzma.h was simply forgotten.
2023-04-13liblzma: Cleans up old commented out code.Jia Tan1-11/+0
2023-03-23Build: Removes redundant check for LZMA1 filter support.Jia Tan1-4/+1
2023-03-19liblzma: Silence -Wsign-conversion in SSE2 code in memcmplen.h.Lasse Collin1-1/+2
Thanks to Christian Hesse for reporting the issue. Fixes: https://github.com/tukaani-project/xz/issues/44
2023-03-18Change a few HTTP URLs to HTTPS.Lasse Collin2-5/+5
The xz man page timestamp was intentionally left unchanged.
2023-03-17liblzma: Remove note from lzma_options_bcj about the ARM64 exception.Jia Tan1-1/+1
This was left in by mistake since an early version of the ARM64 filter used a different struct for its options.
2023-03-17liblzma: Add set lzma.h as the main page for Doxygen documentation.Jia Tan15-29/+2
The \mainpage command is used in the first block of comments in lzma.h. This changes the previously nearly empty index.html to use the first comment block in lzma.h for its contents. lzma.h is no longer documented separately, but this is for the better since lzma.h only defined a few macros that users do not need to use. The individual API header files all have a disclaimer that they should not be #included directly, so there should be no confusion on the fact that lzma.h should be the only header used by applications. Additionally, the note "See ../lzma.h for information about liblzma as a whole." was removed since lzma.h is now the main page of the generated HTML and does not have its own page anymore. So it would be confusing in the HTML version and was only a "nice to have" when browsing the source files.
2023-03-13liblzma: Defines masks for return values from lzma_index_checks().Jia Tan1-0/+23
2023-03-01liblzma: Clarify lzma_lzma_preset() documentation in lzma12.h.Jia Tan1-0/+5
lzma_lzma_preset() does not guarentee that the lzma_options_lzma are usable in an encoder even if it returns false (success). If liblzma is built with default configurations, then the options will always be usable. However if the match finders hc3, hc4, or bt4 are disabled, then the options may not be usable depending on the preset level requested. The documentation was updated to reflect this complexity, since this behavior was unclear before.
2023-02-24liblzma: Replace '\n' -> newline in filter.h documentation.Jia Tan1-1/+1
The '\n' renders as a newline when the comments are converted to html by Doxygen.
2023-02-24liblzma: Shorten return description for two functions in filter.h.Jia Tan1-6/+2
Shorten the description for lzma_raw_encoder_memusage() and lzma_raw_decoder_memusage().
2023-02-24liblzma: Reword a few lines in filter.hJia Tan1-5/+5
2023-02-24liblzma: Improve documentation in filter.h.Jia Tan1-83/+143
All functions now explicitly specify parameter and return values. The notes and code annotations were moved before the parameter and return value descriptions for consistency. Also, the description above lzma_filter_encoder_is_supported() about not being able to list available filters was removed since lzma_str_list_filters() will do this.
2023-02-23liblzma: Avoid null pointer + 0 (undefined behavior in C).Lasse Collin10-23/+77
In the C99 and C17 standards, section 6.5.6 paragraph 8 means that adding 0 to a null pointer is undefined behavior. As of writing, "clang -fsanitize=undefined" (Clang 15) diagnoses this. However, I'm not aware of any compiler that would take advantage of this when optimizing (Clang 15 included). It's good to avoid this anyway since compilers might some day infer that pointer arithmetic implies that the pointer is not NULL. That is, the following foo() would then unconditionally return 0, even for foo(NULL, 0): void bar(char *a, char *b); int foo(char *a, size_t n) { bar(a, a + n); return a == NULL; } In contrast to C, C++ explicitly allows null pointer + 0. So if the above is compiled as C++ then there is no undefined behavior in the foo(NULL, 0) call. To me it seems that changing the C standard would be the sane thing to do (just add one sentence) as it would ensure that a huge amount of old code won't break in the future. Based on web searches it seems that a large number of codebases (where null pointer + 0 occurs) are being fixed instead to be future-proof in case compilers will some day optimize based on it (like making the above foo(NULL, 0) return 0) which in the worst case will cause security bugs. Some projects don't plan to change it. For example, gnulib and thus many GNU tools currently require that null pointer + 0 is defined: https://lists.gnu.org/archive/html/bug-gnulib/2021-11/msg00000.html https://www.gnu.org/software/gnulib/manual/html_node/Other-portability-assumptions.html In XZ Utils null pointer + 0 issue should be fixed after this commit. This adds a few if-statements and thus branches to avoid null pointer + 0. These check for size > 0 instead of ptr != NULL because this way bugs where size > 0 && ptr == NULL will likely get caught quickly. None of them are in hot spots so it shouldn't matter for performance. A little less readable version would be replacing ptr + offset with offset != 0 ? ptr + offset : ptr or creating a macro for it: #define my_ptr_add(ptr, offset) \ ((offset) != 0 ? ((ptr) + (offset)) : (ptr)) Checking for offset != 0 instead of ptr != NULL allows GCC >= 8.1, Clang >= 7, and Clang-based ICX to optimize it to the very same code as ptr + offset. That is, it won't create a branch. So for hot code this could be a good solution to avoid null pointer + 0. Unfortunately other compilers like ICC 2021 or MSVC 19.33 (VS2022) will create a branch from my_ptr_add(). Thanks to Marcin Kowalczyk for reporting the problem: https://github.com/tukaani-project/xz/issues/36
2023-02-23liblzma: Adjust container.h for consistency with filter.h.Jia Tan1-11/+9
2023-02-23liblzma: Fix small typos and reword a few things in filter.h.Jia Tan1-7/+6
2023-02-23liblzma: Convert list of flags in lzma_mt to bulleted list.Jia Tan1-3/+6
2023-02-23liblzma: Fix typo in documentation in container.hJia Tan1-1/+1
lzma_microlzma_decoder -> lzma_microlzma_encoder
2023-02-23liblzma: Improve documentation for container.hJia Tan1-53/+93
Standardizing each function to always specify parameters and return values. Also moved the parameters and return values to the end of each function description.
2023-02-16liblzma: Very minor API doc tweaks.Lasse Collin4-14/+14
Use "member" to refer to struct members as that's the term used by the C standard. Use lzma_options_delta.dist and such in docs so that in Doxygen's HTML output they will link to the doc of the struct member. Clean up a few trailing white spaces too.
2023-02-17liblzma: Adjust spacing in doc headers in bcj.h.Jia Tan1-7/+7
2023-02-17liblzma: Adjust documentation in bcj.h for consistent style.Jia Tan1-21/+22
2023-02-17liblzma: Rename field => member in documentation.Jia Tan7-95/+95
Also adjusted preset value => preset level.
2023-02-16liblzma: Silence a warning from MSVC.Lasse Collin1-1/+1
It gives C4146 here since unary minus with unsigned integer is still unsigned (which is the intention here). Doing it with substraction makes it clearer and avoids the warning. Thanks to Nathan Moinvaziri for reporting this.
2023-02-16 liblzma: Improve documentation for stream_flags.hJia Tan1-30/+46
Standardizing each function to always specify parameters and return values. Also moved the parameters and return values to the end of each function description. A few small things were reworded and long sentences broken up.
2023-02-15liblzma: Improve documentation in lzma12.h.Jia Tan1-9/+23
All functions now explicitly specify parameter and return values.
2023-02-15liblzma: Improve documentation in check.h.Jia Tan1-13/+28
All functions now explicitly specify parameter and return values. Also moved the note about SHA-256 functions not being exported to the top of the file.
2023-02-15liblzma: Improve documentation in index.hJia Tan1-51/+126
All functions now explicitly specify parameter and return values.
2023-02-15liblzma: Reword a comment in index.h.Jia Tan1-2/+2
2023-02-15liblzma: Omit lzma_index_iter's internal field from Doxygen docs.Jia Tan1-1/+8
Add \private above this field and its sub-fields since it is not meant to be modified by users.
2023-02-14liblzma: Fix documentation for LZMA_MEMLIMIT_ERROR.Jia Tan1-1/+1
LZMA_MEMLIMIT_ERROR was missing the "<" character needed to put documentation after a member.
2023-02-14liblzma: Improve documentation for base.h.Jia Tan1-5/+25
Standardizing each function to always specify params and return values. Also fixed a small grammar mistake.
2023-02-14liblzma: Add one more missing [out] annotation in vli.hJia Tan1-1/+1
2023-02-14liblzma: Minor improvements to vli.h.Jia Tan1-6/+7
Added [out] annotations to parameters that are pointers and can have their value changed. Also added a clarification to lzma_vli_is_valid.
2023-02-10liblzma: Add comments for macros in delta.h.Jia Tan1-0/+8
Document LZMA_DELTA_DIST_MIN and LZMA_DELTA_DIST_MAX for completeness and to avoid Doxygen warnings.
2023-02-10liblzma: Improve documentation in index_hash.h.Jia Tan1-9/+27
All functions now explicitly specify parameter and return values. Also reworded the description of lzma_index_hash_init() for readability.
2023-02-04liblzma: Improve documentation for version.h.Jia Tan1-7/+22
Specified parameter and return values for API functions and documented a few more of the macros.
2023-02-03liblzma: Fix bug in lzma_str_from_filters() not checking filters[] length.Jia Tan1-0/+7
The bug is only a problem in applications that do not properly terminate the filters[] array with LZMA_VLI_UNKNOWN or have more than LZMA_FILTERS_MAX filters. This bug does not affect xz.
2023-02-03liblzma: Fix typos in comments in string_conversion.c.Jia Tan1-2/+2
2023-02-03liblzma: Clarify block encoder and decoder documentation.Jia Tan1-4/+11
Added a few sentences to the description for lzma_block_encoder() and lzma_block_decoder() to highlight that the Block Header must be coded before calling these functions.
2023-02-03Update lzma_block documentation for lzma_block_uncomp_encode().Jia Tan1-0/+3
2023-02-03liblzma: Minor edits to lzma_block header_size documentation.Jia Tan1-1/+2
2023-02-03liblzma: Enumerate functions that read version in lzma_block.Jia Tan1-2/+11
2023-02-03liblzma: Clarify comment in block.h.Jia Tan1-1/+2
2023-02-03liblzma: Improve documentation for block.h.Jia Tan1-21/+75
Standardizing each function to always specify params and return values. Output pointer parameters are also marked with doxygen style [out] to make it clear. Any note sections were also moved above the parameter and return sections for consistency.
2023-02-01liblzma: Clarify a comment about LZMA_STR_NO_VALIDATION.Jia Tan1-2/+3
The flag description for LZMA_STR_NO_VALIDATION was previously confusing about the treatment for filters than cannot be used with .xz format (lzma1) without using LZMA_STR_ALL_FILTERS. Now, it is clear that LZMA_STR_NO_VALIDATION is not a super set of LZMA_STR_ALL_FILTERS.
2023-01-24liblzma: Fix documentation in filter.h for lzma_str_to_filters()Jia Tan1-1/+1
The previous documentation for lzma_str_to_filters() was technically correct, but misleading. lzma_str_to_filters() returns NULL on success, which is in practice always defined to 0. This is the same value as LZMA_OK, but lzma_str_to_filters() does not return lzma_ret so we should be more clear.
2023-01-21liblzma: Set documentation on all reserved fields to private.Jia Tan7-0/+173
This prevents the reserved fields from being part of the generated Doxygen documentation.
2023-01-20liblzma: Highlight liblzma API headers should not be included directly.Jia Tan14-28/+42
This improves the generated Doxygen HTML files to better highlight how to properly use the liblzma API header files.
2023-01-12liblzma: Silence another warning from -Wsign-conversion in a 32-bit build.Lasse Collin1-3/+4
It doesn't warn on a 64-bit system because truncating a ptrdiff_t (signed long) to uint32_t is diagnosed under -Wconversion by GCC and -Wshorten-64-to-32 by Clang.
2023-01-12liblzma: Silence warnings from clang -Wconditional-uninitialized.Lasse Collin2-4/+6
This is similar to 2ce4f36f179a81d0c6e182a409f363df759d1ad0. The actual initialization of the variables is done inside mythread_sync() macro. Clang doesn't seem to see that the initialization code inside the macro is always executed.
2023-01-12Fix warnings from clang -Wdocumentation.Lasse Collin2-6/+2
2023-01-10liblzma: CLMUL CRC64: Work around a bug in MSVC, second attempt.Lasse Collin1-0/+18
This affects only 32-bit x86 builds. x86-64 is OK as is. I still cannot easily test this myself. The reporter has tested this and it passes the tests included in the CMake build and performance is good: raw CRC64 is 2-3 times faster than the C version of the slice-by-four method. (Note that liblzma doesn't include a MSVC-compatible version of the 32-bit x86 assembly code for the slice-by-four method.) Thanks to Iouri Kharon for figuring out a fix, testing, and benchmarking.
2023-01-10Revert "liblzma: CLMUL CRC64: Workaround a bug in MSVC (VS2015-2022)."Lasse Collin1-6/+0
This reverts commit 36edc65ab4cf10a131f239acbd423b4510ba52d5. It was reported that it wasn't a good enough fix and MSVC still produced (different kind of) bad code when building for 32-bit x86 if optimizations are enabled. Thanks to Iouri Kharon.
2023-01-09liblzma: CLMUL CRC64: Workaround a bug in MSVC (VS2015-2022).Lasse Collin1-0/+6
I haven't tested with MSVC myself and there doesn't seem to be information about the problem online, so I'm relying on the bug report. Thanks to Iouri Kharon for the bug report and the patch.
2023-01-07Merge pull request #7 from tukaani-project/tuktest_index_hashJia Tan9-8/+20
Tuktest index hash
2023-01-05liblzma: Remove common.h include from common/index.h.Jia Tan4-2/+10
common/index.h is needed by liblzma internally and tests. common.h will include and define many things that are not needed by the tests. Also, this prevents include order problems because common.h will redefine LZMA_API resulting in a warning.
2023-01-02Bump version and soname for 5.5.0alpha.larhzu/v5.5.0alphaLasse Collin2-3/+3
5.5.0alpha won't be released, it's just to mark that the branch is not for stable 5.4.x. Once again there is no API/ABI stability for new features in devel versions. The major soname won't be bumped even if API/ABI of new features breaks between devel releases.
2023-01-02liblzma: Add NULL check to lzma_index_hash_append.Jia Tan1-1/+1
This is for consistency with lzma_index_append.
2023-01-02liblzma: Replaced hardcoded 0x0 index indicator byte with macroJia Tan6-5/+9
2022-12-30liblzma: Update documentation for lzma_filter_encoder.Jia Tan1-2/+5
2022-12-30liblzma: Fix lzma_microlzma_encoder() return value.Jia Tan1-1/+2
Using return_if_error on lzma_lzma_lclppb_encode was improper because return_if_error is expecting an lzma_ret value, but lzma_lzma_lclppb_encode returns a boolean. This could result in lzma_microlzma_encoder, which would be misleading for applications.
2022-12-16liblzma: Update authors list in arm64.c.Lasse Collin1-0/+1
2022-12-13Bump version to 5.4.0 and soname to 5.4.0.larhzu/v5.4.0Lasse Collin4-6/+6
2022-12-11liblzma: Change LZMA_FILTER_ARM64 to the official Filter ID 0x0A.Lasse Collin1-5/+1
2022-12-08liblzma: Check for unexpected NULL pointers in block_header_decode().Lasse Collin1-0/+4
The API docs gave an impression that such checks are done but they actually weren't done. In practice it made little difference since the calling code has a bug if these are NULL. Thanks to Jia Tan for the original patch that checked for block->filters == NULL.
2022-12-01Bump version number for 5.3.5beta.larhzu/v5.3.5betaLasse Collin3-12/+12
This also sorts the symbol names alphabetically in liblzma_*.map.
2022-12-01liblzma: Use __has_attribute(__symver__) to fix Clang detection.Lasse Collin1-1/+14
If someone sets up Clang to define __GNUC__ to 10 or greater then symvers broke. __has_attribute is supported by such GCC and Clang versions that don't support __symver__ so this should be much better and simpler way to detect if __symver__ is actually supported. Thanks to Tomasz Gajc for the bug report.
2022-12-01liblzma: Omit zero-skipping from ARM64 filter.Lasse Collin2-59/+24
It has some complicated downsides and its usefulness is more limited than I originally thought. So this change is bad for certain very specific situations but a generic solution that works for other filters (and is otherwise better too) is planned anyway. And this way 7-Zip can use the same compatible filter for the .7z format. This is still marked as experimental with a new temporary Filter ID.
2022-12-01liblzma: Don't be over-specific in lzma_str_to_filters API doc.Lasse Collin1-2/+1
2022-12-01liblzma: Silence unused variable warning when BCJ filters are disabled.Lasse Collin1-0/+15
Thanks to Jia Tan for the original patch.
2022-11-29liblzma: Improve documentation for string to filter functions.Jia Tan1-8/+9
2022-11-29liblzma: Two fixes to lzma_str_list_filters() API docs.Lasse Collin1-3/+3
Thanks to Jia Tan.
2022-11-28liblzma: Add lzma_str_to_filters, _from_filters, and _list_filters.Lasse Collin5-0/+1567
lzma_str_to_filters() uses static error messages which makes them not very precise. It tells the position in the string where an error occurred though which helps quite a bit if applications take advantage of it. Dynamic error messages can be added later with a new flag if it seems important enough.
2022-11-28liblzma: Make lzma_validate_chain() available outside filter_common.c.Lasse Collin2-4/+7
2022-11-28liblzma: Remove lzma_lz_decoder_uncompressed() as it's now unused.Lasse Collin2-17/+0
2022-11-28liblzma: Use LZMA1EXT feature in lzma_microlzma_decoder().Lasse Collin1-7/+8
Here too this avoids the slightly ugly method to set the uncompressed size. Also moved the setting of dict_size to the struct initializer.
2022-11-28liblzma: Use LZMA1EXT feature in lzma_alone_decoder().Lasse Collin1-5/+13
This avoids the need to use the slightly ugly method to set the uncompressed size.
2022-11-27liblzma: Add LZMA_FILTER_LZMA1EXT to support LZMA1 without end marker.Lasse Collin9-15/+204
Some file formats need support for LZMA1 streams that don't use the end of payload marker (EOPM) alias end of stream (EOS) marker. So far liblzma API has supported decompressing such streams via lzma_alone_decoder() when .lzma header specifies a known uncompressed size. Encoding support hasn't been available in the API. Instead of adding a new LZMA1-only API for this purpose, this commit adds a new filter ID for use with raw encoder and decoder. The main benefit of this approach is that then also filter chains are possible, for example, if someone wants to implement support for .7z files that use the x86 BCJ filter with LZMA1 (not BCJ2 as that isn't supported in liblzma).
2022-11-27liblzma: Avoid unneeded use of void pointer in LZMA decoder.Lasse Collin2-3/+2
2022-11-27liblzma: Pass the Filter ID to LZ encoder and decoder.Lasse Collin14-12/+26
This allows using two Filter IDs with the same initialization function and data structures.
2022-11-27liblzma: Remove two FIXME comments.Lasse Collin1-2/+2
2022-11-26liblzma: Use lzma_filters_free() in more places.Lasse Collin3-38/+8
2022-11-25liblzma: Omit simple coder init functions if they are disabled.Lasse Collin6-0/+24
2022-11-24liblzma: Allow nice_len 2 and 3 even if match finder requires 3 or 4.Lasse Collin3-8/+26
That is, if the specified nice_len is smaller than the minimum of the match finder, silently use the match finder's minimum value instead of reporting an error. The old behavior is annoying to users and it complicates xz options handling too.
2022-11-24liblzma: Add lzma_filters_update() support to the multi-threaded encoder.Lasse Collin2-23/+109
A tiny downside of this is that now a 1-4 tiny allocations are made for every Block because each worker thread needs its own copy of the filter chain.
2022-11-24Build: Don't put GNU/Linux-specific symbol versions into static liblzma.Lasse Collin1-0/+12
It not only makes no sense to put symbol versions into a static library but it can also cause breakage. By default Libtool #defines PIC if building a shared library and doesn't define it for static libraries. This is documented in the Libtool manual. It can be overriden using --with-pic or --without-pic. configure.ac detects if --with-pic or --without-pic is used and then gives an error if neither --disable-shared nor --disable-static was used at the same time. Thus, in normal situations it works to build both shared and static library at the same time on GNU/Linux, only --with-pic or --without-pic requires that only one type of library is built. Thanks to John Paul Adrian Glaubitz from Debian for reporting the problem that occurred on ia64: https://www.mail-archive.com/xz-devel@tukaani.org/msg00610.html
2022-11-24liblzma: Refactor to use lzma_filters_free().Lasse Collin2-21/+6
lzma_filters_free() sets the options to NULL and ids to LZMA_VLI_UNKNOWN so there is no need to do it by caller; the filter arrays will always be left in a safe state. Also use memcpy() instead of a loop to copy a filter chain when it is known to be safe to copy LZMA_FILTERS_MAX + 1 (even if the elements past the terminator might be uninitialized).
2022-11-24liblzma: Fix another invalid free() after memory allocation failure.Lasse Collin1-0/+4
This time it can happen when lzma_stream_encoder_mt() is used to reinitialize an existing multi-threaded Stream encoder and one of 1-4 tiny allocations in lzma_filters_copy() fail. It's very similar to the previous bug 10430fbf3820dafd4eafd38ec8be161a6978ed2b, happening with an array of lzma_filter structures whose old options are freed but the replacement never arrives due to a memory allocation failure in lzma_filters_copy().
2022-11-24liblzma: Add support for LZMA_SYNC_FLUSH in the Block encoder.Jia Tan1-0/+1
The documentation mentions that lzma_block_encoder() supports LZMA_SYNC_FLUSH but it was never added to supported_actions[] in the internal structure. Because of this, LZMA_SYNC_FLUSH could not be used with the Block encoder unless it was the next coder after something like stream_encoder() or stream_encoder_mt().
2022-11-24liblzma: Add new API function lzma_filters_free().Lasse Collin4-0/+49
This is small but convenient and should have been added a long time ago.
2022-11-23liblzma: Add lzma_attr_warn_unused_result to lzma_filters_copy().Lasse Collin1-1/+2
2022-11-23liblzma: Fix invalid free() after memory allocation failure.Lasse Collin1-8/+31
The bug was in the single-threaded .xz Stream encoder in the code that is used for both re-initialization and for lzma_filters_update(). To trigger it, an application had to either re-initialize an existing encoder instance with lzma_stream_encoder() or use lzma_filters_update(), and then one of the 1-4 tiny allocations in lzma_filters_copy() (called from stream_encoder_update()) must fail. An error was correctly reported but the encoder state was corrupted. This is related to the recent fix in f8ee61e74eb40600445fdb601c374d582e1e9c8a which is good but it wasn't enough to fix the main problem in stream_encoder.c.
2022-11-22liblzma: Fix language in a comment.Lasse Collin1-1/+1
2022-11-22liblzma: Fix infinite loop in LZMA encoder init with dict_size >= 2 GiB.Lasse Collin1-4/+15
The encoder doesn't support dictionary sizes larger than 1536 MiB. This is validated, for example, when calculating the memory usage via lzma_raw_encoder_memusage(). It is also enforced by the LZ part of the encoder initialization. However, LZMA encoder with LZMA_MODE_NORMAL did an unsafe calculation with dict_size before such validation and that results in an infinite loop if dict_size was 2 << 30 or greater.
2022-11-21liblzma: Fix two Doxygen commands in the API headers.Lasse Collin2-2/+2
These were caught by clang -Wdocumentation.
2022-11-15Bump version number for 5.3.4alpha.larhzu/v5.3.4alphaLasse Collin3-3/+3
2022-11-14Revert "liblzma: Simple/BCJ filters: Allow disabling generic BCJ options."Lasse Collin9-11/+10
This reverts commit 177bdc922cb17bd0fd831ab8139dfae912a5c2b8 and also does equivalent change to arm64.c. Now that ARM64 filter will use lzma_options_bcj, this change is not needed anymore.
2022-11-14Replace the experimental ARM64 filter with a new experimental version.Lasse Collin7-237/+136
This is incompatible with the previous version. This has space/tab fixes in filter_*.c and bcj.h too.
2022-11-14liblzma: Add fast CRC64 for 32/64-bit x86 using SSSE3 + SSE4.1 + CLMUL.Lasse Collin2-9/+461
It also works on E2K as it supports these intrinsics. On x86-64 runtime detection is used so the code keeps working on older processors too. A CLMUL-only build can be done by using -msse4.1 -mpclmul in CFLAGS and this will reduce the library size since the generic implementation and its 8 KiB lookup table will be omitted. On 32-bit x86 this isn't used by default for now because by default on 32-bit x86 the separate assembly file crc64_x86.S is used. If --disable-assembler is used then this new CLMUL code is used the same way as on 64-bit x86. However, a CLMUL-only build (-msse4.1 -mpclmul) won't omit the 8 KiB lookup table on 32-bit x86 due to a currently-missing check for disabled assembler usage. The configure.ac check should be such that the code won't be built if something in the toolchain doesn't support it but --disable-clmul-crc option can be used to unconditionally disable this feature. CLMUL speeds up decompression of files that have compressed very well (assuming CRC64 is used as a check type). It is know that the CLMUL code is significantly slower than the generic code for tiny inputs (especially 1-8 bytes but up to 16 bytes). If that is a real-world problem then there is already a commented-out variant that uses the generic version for small inputs. Thanks to Ilya Kurdyukov for the original patch which was derived from a white paper from Intel [1] (published in 2009) and public domain code from [2] (released in 2016). [1] https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf [2] https://github.com/rawrunprotected/crc
2022-11-14liblzma: Use __attribute__((__constructor__)) if available.Lasse Collin3-1/+13
This uses it for CRC table initializations when using --disable-small. It avoids mythread_once() overhead. It also means that then --disable-small --disable-threads is thread-safe if this attribute is supported.
2022-11-11liblzma: Fix building with Intel ICC (the classic compiler).Lasse Collin1-1/+1
It claims __GNUC__ >= 10 but doesn't support __symver__ attribute. Thanks to Stephen Sachs.
2022-11-11liblzma: Fix incorrect #ifdef for x86 SSE2 support.Lasse Collin1-2/+1
__SSE2__ is the correct macro for SSE2 support with GCC, Clang, and ICC. __SSE2_MATH__ means doing floating point math with SSE2 instead of 387. Often the latter macro is defined if the first one is but it was still a bug.
2022-11-09liblzma: Add .lz support to lzma_auto_decoder().Lasse Collin4-11/+47
Thanks to Michał Górny for the original patch.
2022-11-09liblzma: Add .lz (lzip) decompression support (format versions 0 and 1).Lasse Collin5-2/+480
Support for format version 0 was removed from lzip 1.18 for some reason. .lz format version 0 files are rare (and old) but some source packages were released in this format, and some people might have personal files in this format too. It's very little extra code to support it along side format version 1 so this commits adds support for both. The Sync Flush marker extentension to the original .lz format version 1 isn't supported. It would require changes to the LZMA decoder itself. Such files are very rare anyway. See the API doc for lzma_lzip_decoder() for more details about the .lz format support. Thanks to Michał Górny for the original patch.
2022-11-09liblzma: Add the missing Makefile.inc change for --disable-microlzma.Lasse Collin1-2/+10
This was forgotten from commit 59c4d6e1390f6f4176f43ac1dad1f7ac03c449b8.
2022-11-08liblzma: Update API docs about decoder flags.Lasse Collin1-4/+17
2022-11-08liblzma: Use the return_if_error() macro in alone_decoder.c.Lasse Collin1-4/+2
2022-11-08liblzma: Fix a comment in auto_decoder.c.Lasse Collin1-2/+2
2022-11-07liblzma: Include cached memory in reported memusage in threaded decoder.Lasse Collin1-3/+19
This affects lzma_memusage() and lzma_memlimit_set() when used with the threaded decompressor. Now all allocations are reported by lzma_memusage() (so it's not misleading) and lzma_memlimit_set() cannot lower the limit below that value. The alternative would have been to allow lowering the limit if doing so is possible by freeing the cached memory but since the primary use case of lzma_memlimit_set() is to increase memlimit after LZMA_MEMLIMIT_ERROR this simple approach was selected. The cached memory was always included when enforcing the memory usage limit while decoding. Thanks to Jia Tan.
2022-10-31liblzma: Silence -Wconversion warning from crc64_fast.c.Lasse Collin1-2/+3
2022-10-24liblzma: Threaded decoder: Stop the worker threads on errors.Lasse Collin1-7/+26
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.
2022-10-05liblzma: Fix a compilation issue when encoders are disabled.Jia Tan1-3/+4
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.
2022-10-05tuklib_integer: Add 64-bit endianness-converting reads and writes.Lasse Collin1-6/+3
Also update the comment in liblzma's memcmplen.h. Thanks to Michał Górny for the original patch for the reads.
2022-09-30liblzma: Add API doc note about the .xz decoder LZMA_MEMLIMIT_ERROR bug.Lasse Collin1-0/+11
The bug was fixed in 660739f99ab211edec4071de98889fb32ed04e98.
2022-09-28liblzma: Add dest and src NULL checks to lzma_index_cat.Jia Tan1-0/+3
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.
2022-09-28liblzma: Fix copying of check type statistics in lzma_index_cat().Jia Tan1-1/+6
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.
2022-09-28liblzma: Stream decoder: Fix restarting after LZMA_MEMLIMIT_ERROR.Lasse Collin1-3/+13
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.
2022-09-28liblzma: Stream decoder: Fix comments.Lasse Collin1-7/+5
2022-09-20liblzma: ARM64: Add comments.Lasse Collin1-0/+13
2022-09-20liblzma: ARM64: Fix wrong comment in API doc.Lasse Collin1-2/+2
Thanks to Jia Tan.
2022-09-19liblzma: Add experimental ARM64 BCJ filter with a temporary Filter ID.Lasse Collin9-1/+308
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.
2022-09-17liblzma: Simple/BCJ filters: Allow disabling generic BCJ options.Lasse Collin8-9/+10
This will be needed for the ARM64 BCJ filter as it will use its own options struct.
2022-09-09liblzma: lzma_filters_copy: Keep dest[] unmodified if an error occurs.Lasse Collin2-7/+15
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.
2022-09-08liblzma: lzma_index_append: Add missing integer overflow check.Jia Tan1-0/+4
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.
2022-09-08liblzma: Vaccinate against an ill patch from RHEL/CentOS 7.Lasse Collin9-14/+360
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.
2022-08-22Bump version number for 5.3.3alpha.larhzu/v5.3.3alphaLasse Collin2-2/+2
2022-08-18liblzma: Threaded decoder: Improve LZMA_FAIL_FAST when LZMA_FINISH is used.Lasse Collin2-0/+48
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.
2022-07-25liblzma: Refactor lzma_mf_is_supported() to use a switch-statement.Jia Tan1-18/+14
2022-07-14liblzma: Rename a variable and improve a comment.Lasse Collin1-4/+9
2022-07-13liblzma: Add optional autodetection of LZMA end marker.Lasse Collin6-37/+86
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.
2022-05-23liblzma: Silence a warning.Lasse Collin1-1/+1
The actual initialization is done via mythread_sync and seems that GCC doesn't necessarily see that it gets initialized there.
2022-04-06liblzma: Threaded decoder: Improve setting of pending_error.Lasse Collin1-16/+35
It doesn't need to be done conditionally. The comments try to explain it.