conor42 / fast-lzma2 Goto Github PK

Is there any documentation for flzma2, e.g. max dictionary size, fast bytes, cycles, compression levels etc.? I've been wading through the source to look for selectable parameters, saw that dictionary is limited to 1024MB, and apparently there are 3 compression strategies with 10 compression levels each, but I have no idea how to call them. Any help would be much appreciated.

Good day!
It will be good (for very bit data sizes) to add support for 4096 MB dictionary size for lzma-fast

Can data compressed with fast-lzma2 be decompressed by a binary utilizing the lzma2 library?

Hello,

I just started to do some work on 7-Zip ZS again... how could this "faster" lzma put together within 7-Zip without too much hassle ?

Your code is currently out of the master branch, but there is an extra branch called radyx ;-)

Greetings, Tino

I am trying to integrate LZMA2 functionality into LibTIFF (https://gitlab.com/libtiff/libtiff) using CMake. Without it LibTIFF will complain when running cmake:

-- LZMA2 support: ON (requested) FALSE (availability)

The CMakeLists.txt of LibTIFF tests existence of LZMA2 library using CMake's own script in Modules\FindLibLZMA.cmake. This file tries to check the existence of lzma.h to decide the include directory:

find_path(LIBLZMA_INCLUDE_DIR lzma.h )
find_library(LIBLZMA_LIBRARY NAMES lzma liblzma)

But I could not find lzma.h anywhere in the downloaded source package from here. Also the lzma.lib and liblzma.lib do not exist either in output folder of fast-lzma2 after I successfully built it, which are to be linked to LibTIFF. So how to integrate Fast LZMA2 into LibTIFF using CMake? Thanks.

My environment:

• Windows 10
• Visual Studio 2015 & 2017
• CMake 3.11.4

Is there correct way to cancel decompression of the stream? I am using similar code as in the file_test.c file. i.e. I call FL2_createDStreamMt once at start and then for each stream stored in a file I call FL2_initDStream and then keep calling FL2_decompressStream until I decompress all data. But if my file reading function returns an error, what should I call to cancel the decompression so that next FL2_initDStream doesn't return an error (unfinished decompression of previous stream)? It seems the example in file_test.c doesn't handle reading errors and they are just ignored. I found FL2_cancelDStream, is this the function I should call?

RMF_structuredInit in FL2_compressCurBlock()
RMF_structuredBuildTable in FL2_compressCurBlock()
RMF_structuredIntegrityCheck in RMF_integrityCheck()
RMF_structuredGetMatch in RMF_getMatch()

I am use FLZMA library in the 7zip library of ZA (Android app)

I can not find the reasons of the crashes. I've made minor changes to the code. A couple of small checks. But this did not change the situation. The stack trace and modified source code are attached below.

I have not been able to reproduce the problem. In what cases the problem occurs is also not known.
@conor42, maybe you have some ideas about this?

signal 11 (SIGSEGV), code 1 (SEGV_MAPERR)

backtrace:
  #00  pc 00000000003560d4  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_handleRepeat) (SourceCode: p7zip/C/fast-lzma2/radix_mf.c:306)
  #00  pc 00000000003560d4  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_recurseListChunk_generic) (SourceCode: p7zip/C/fast-lzma2/radix_mf.c:565)
  #00  pc 00000000003560d4  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_recurseListChunk) (SourceCode: p7zip/C/fast-lzma2/radix_mf.c:673)
  #00  pc 00000000003581d0  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_recurseListsBuffered) (SourceCode: p7zip/C/fast-lzma2/radix_engine.h:259)
  #00  pc 0000000000357494  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_bitpackBuildTable) (SourceCode: p7zip/C/fast-lzma2/radix_engine.h:978)
  #00  pc 0000000000357494  /data/app/zarchiver/lib/arm64/libp7zip.so (RMF_buildTable) (SourceCode: p7zip/C/fast-lzma2/radix_mf.c:689)
  #00  pc 0000000000346bb0  /data/app/zarchiver/lib/arm64/libp7zip.so (FL2_compressCurBlock_blocking) (SourceCode: p7zip/C/fast-lzma2/fl2_compress.c:311)
  #00  pc 00000000003466b8  /data/app/zarchiver/lib/arm64/libp7zip.so (FL2_compressCurBlock_async) (SourceCode: p7zip/C/fast-lzma2/fl2_compress.c:366)
  #00  pc 0000000000348f14  /data/app/zarchiver/lib/arm64/libp7zip.so (FL2POOL_thread) (SourceCode: p7zip/C/fast-lzma2/fl2_pool.c:79)
  #00  pc 0000000000084ce4  /system/lib64/libc.so (__pthread_start(void*)+36)
  #00  pc 000000000002344c  /system/lib64/libc.so (__start_thread+68)

FLZMA source fast-lzma2.tar.gz