zlib data compression library for the next generation systems
Maintained by Hans Kristian Rosbach aka Dead2 (zlib-ng àt circlestorm dót org)
The motivation for this fork was seeing several 3rd party contributions with new optimizations not getting implemented into the official zlib repository.
Mark Adler has been maintaining zlib for a very long time, and he has done a great job and hopefully he will continue for a long time yet. The idea of zlib-ng is not to replace zlib, but to co-exist as a drop-in replacement with a lower threshold for code change.
zlib has a long history and is incredibly portable, even supporting many systems that predate the Internet.
That is great, but it can complicate further development and maintainability. The zlib code contains many workarounds for really old compilers or to accommodate systems with limitations such as operating in a 16-bit environment.
Many of these workarounds are only maintenance burdens, some of them are pretty huge code-wise. With many workarounds cluttered throughout the code, it makes it harder for new programmers with an idea/interest for zlib to contribute.
I decided to make a fork, merge all the Intel optimizations, some of the Cloudflare optimizations, plus a couple other smaller patches. Then started cleaning out workarounds, various dead code, all contrib and example code.
The result is a better performing and easier to maintain zlib-ng.
A lot of improvements have gone into zlib-ng since its start, and numerous people and companies have contributed both small and big improvements, or valuable testing.
Please read LICENSE.md, it is very simple and very liberal.
There are two ways to build zlib-ng:
To build zlib-ng using the cross-platform makefile generator cmake.
cmake .
cmake --build . --config Release
ctest --verbose -C Release
Alternatively, you can use the cmake configuration GUI tool ccmake:
To build zlib-ng using the bash configure script:
./configure
make
make test
WARNING: We do not recommend manually installing unless you really know what you are doing, because this can potentially override the system default zlib library, and any incompatibility or wrong configuration of zlib-ng can make the whole system unusable, requiring recovery or reinstall. If you still want a manual install, we recommend using the /opt/ path prefix.
For Linux distros, an alternative way to use zlib-ng (if compiled in zlib-compat mode) instead of zlib, is through the use of the LD_PRELOAD environment variable. If the program is dynamically linked with zlib, then the program will temporarily attempt to use zlib-ng instead, without risking system-wide instability.
LD_PRELOAD=/opt/zlib-ng/libz.so.1.2.13.zlib-ng /usr/bin/program
To install zlib-ng system-wide using cmake:
cmake --build . --target install
To install zlib-ng system-wide using the configure script:
After building with cmake, an installation package can be created using cpack. By default a tgz package is created, but you can append -G <format> to each command to generate alternative packages types (TGZ, ZIP, RPM, DEB). To easily create a rpm or deb package, you would use -G RPM or -G DEB respectively.
cd build cpack --config CPackConfig.cmake cpack --config CPackSourceConfig.cmake
Alternatively, you can build and install zlib-ng using the vcpkg dependency manager:
git clone https://github.com/Microsoft/vcpkg.git cd vcpkg ./bootstrap-vcpkg.sh # "./bootstrap-vcpkg.bat" for powershell ./vcpkg integrate install ./vcpkg install zlib-ng
The zlib-ng port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.
Zlib-ng is aiming to be open to contributions, and we would be delighted to receive pull requests on github. Help with testing and reviewing pull requests etc is also very much appreciated.
Please check the Wiki for more info: Contributing
Thanks go out to all the people and companies who have taken the time to contribute code reviews, testing and/or patches. Zlib-ng would not have been nearly as good without you.
The deflate format used by zlib was defined by Phil Katz.
The deflate and zlib specifications were written by L. Peter Deutsch.
zlib was originally created by Jean-loup Gailly (compression) and Mark Adler (decompression).
CMake configure Description Default FORCE_SSE2 --force-sse2 Skip runtime check for SSE2 instructions (Always on for x86_64) OFF (x86) WITH_AVX2 Build with AVX2 intrinsics ON WITH_AVX512 Build with AVX512 intrinsics ON WITH_AVX512VNNI Build with AVX512VNNI intrinsics ON WITH_SSE2 Build with SSE2 intrinsics ON WITH_SSSE3 Build with SSSE3 intrinsics ON WITH_SSE42 Build with SSE42 intrinsics ON WITH_PCLMULQDQ Build with PCLMULQDQ intrinsics ON WITH_VPCLMULQDQ --without-vpclmulqdq Build with VPCLMULQDQ intrinsics ON WITH_ACLE --without-acle Build with ACLE intrinsics ON WITH_NEON --without-neon Build with NEON intrinsics ON WITH_ARMV6 --without-armv6 Build with ARMv6 intrinsics ON WITH_ALTIVEC --without-altivec Build with AltiVec (VMX) intrinsics ON WITH_POWER8 --without-power8 Build with POWER8 optimisations ON WITH_RVV Build with RVV intrinsics ON WITH_CRC32_VX --without-crc32-vx Build with vectorized CRC32 on IBM Z ON WITH_DFLTCC_DEFLATE --with-dfltcc-deflate Build with DFLTCC intrinsics for compression on IBM Z OFF WITH_DFLTCC_INFLATE --with-dfltcc-inflate Build with DFLTCC intrinsics for decompression on IBM Z OFF WITH_UNALIGNED --without-unaligned Allow optimizations that use unaligned reads if safe on current arch ON WITH_INFLATE_STRICT Build with strict inflate distance checking OFF WITH_INFLATE_ALLOW_INVALID_DIST Build with zero fill for inflate invalid distances OFF INSTALL_UTILS Copy minigzip and minideflate during install OFF ZLIBNG_ENABLE_TESTS Test zlib-ng specific API ONRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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