zstd: vendor python-zstandard 0.8.0
Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from
https://github.com/indygreg/python-zstandard is imported without
modifications (other than removing unwanted files).
Updates relevant to Mercurial include:
* Support for multi-threaded compression (we can use this for
bundle and wire protocol compression).
* APIs for batch compression and decompression operations using
multiple threads and optimal memory allocation mechanism. (Can
be useful for revlog perf improvements.)
* A ``BufferWithSegments`` type that models a single memory buffer
containing N discrete items of known lengths. This type can be
used for very efficient 0-copy data operations.
# no-check-commit
# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
import os
from distutils.extension import Extension
zstd_sources = ['zstd/%s' % p for p in (
'common/entropy_common.c',
'common/error_private.c',
'common/fse_decompress.c',
'common/pool.c',
'common/threading.c',
'common/xxhash.c',
'common/zstd_common.c',
'compress/fse_compress.c',
'compress/huf_compress.c',
'compress/zstd_compress.c',
'compress/zstdmt_compress.c',
'decompress/huf_decompress.c',
'decompress/zstd_decompress.c',
'dictBuilder/cover.c',
'dictBuilder/divsufsort.c',
'dictBuilder/zdict.c',
)]
zstd_sources_legacy = ['zstd/%s' % p for p in (
'deprecated/zbuff_common.c',
'deprecated/zbuff_compress.c',
'deprecated/zbuff_decompress.c',
'legacy/zstd_v01.c',
'legacy/zstd_v02.c',
'legacy/zstd_v03.c',
'legacy/zstd_v04.c',
'legacy/zstd_v05.c',
'legacy/zstd_v06.c',
'legacy/zstd_v07.c'
)]
zstd_includes = [
'c-ext',
'zstd',
'zstd/common',
'zstd/compress',
'zstd/decompress',
'zstd/dictBuilder',
]
zstd_includes_legacy = [
'zstd/deprecated',
'zstd/legacy',
]
ext_sources = [
'zstd.c',
'c-ext/bufferutil.c',
'c-ext/compressiondict.c',
'c-ext/compressobj.c',
'c-ext/compressor.c',
'c-ext/compressoriterator.c',
'c-ext/compressionparams.c',
'c-ext/compressionwriter.c',
'c-ext/constants.c',
'c-ext/decompressobj.c',
'c-ext/decompressor.c',
'c-ext/decompressoriterator.c',
'c-ext/decompressionwriter.c',
'c-ext/frameparams.c',
]
zstd_depends = [
'c-ext/python-zstandard.h',
]
def get_c_extension(support_legacy=False, name='zstd'):
"""Obtain a distutils.extension.Extension for the C extension."""
root = os.path.abspath(os.path.dirname(__file__))
sources = [os.path.join(root, p) for p in zstd_sources + ext_sources]
if support_legacy:
sources.extend([os.path.join(root, p) for p in zstd_sources_legacy])
include_dirs = [os.path.join(root, d) for d in zstd_includes]
if support_legacy:
include_dirs.extend([os.path.join(root, d) for d in zstd_includes_legacy])
depends = [os.path.join(root, p) for p in zstd_depends]
extra_args = ['-DZSTD_MULTITHREAD']
if support_legacy:
extra_args.append('-DZSTD_LEGACY_SUPPORT=1')
# TODO compile with optimizations.
return Extension(name, sources,
include_dirs=include_dirs,
depends=depends,
extra_compile_args=extra_args)