comparison mercurial/util.py @ 37496:1765ed63db40

util: drop write_content_size=True

This is now the default in python-zstandard 0.9. While we're here,
also add a comment about the ability to drop frame magic to save
space.

Differential Revision: https://phab.mercurial-scm.org/D3199

37495:b1fb341d8a61

        dctx = zstd.ZstdDecompressor()
        return chunkbuffer(dctx.read_from(fh))

    class zstdrevlogcompressor(object):
        def __init__(self, zstd, level=3):
            # Writing the content size adds a few bytes to the output. However,
            # it allows decompression to be more optimal since we can
            # pre-allocate a buffer to hold the result.
            self._cctx = zstd.ZstdCompressor(level=level,
                                             write_content_size=True)
            self._dctx = zstd.ZstdDecompressor()
            self._compinsize = zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE
            self._decompinsize = zstd.DECOMPRESSION_RECOMMENDED_INPUT_SIZE

        def compress(self, data):

37496:1765ed63db40

        dctx = zstd.ZstdDecompressor()
        return chunkbuffer(dctx.read_from(fh))

    class zstdrevlogcompressor(object):
        def __init__(self, zstd, level=3):
            # TODO consider omitting frame magic to save 4 bytes.
            # This writes content sizes into the frame header. That is
            # extra storage. But it allows a correct size memory allocation
            # to hold the result.
            self._cctx = zstd.ZstdCompressor(level=level)
            self._dctx = zstd.ZstdDecompressor()
            self._compinsize = zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE
            self._decompinsize = zstd.DECOMPRESSION_RECOMMENDED_INPUT_SIZE

        def compress(self, data):