Mercurial > hg
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
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 09 Apr 2018 10:18:10 -0700 |
parents | 9ecb7c471cfb |
children | 5b8a260769a2 |
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37495:b1fb341d8a61 | 37496:1765ed63db40 |
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3564 dctx = zstd.ZstdDecompressor() | 3564 dctx = zstd.ZstdDecompressor() |
3565 return chunkbuffer(dctx.read_from(fh)) | 3565 return chunkbuffer(dctx.read_from(fh)) |
3566 | 3566 |
3567 class zstdrevlogcompressor(object): | 3567 class zstdrevlogcompressor(object): |
3568 def __init__(self, zstd, level=3): | 3568 def __init__(self, zstd, level=3): |
3569 # Writing the content size adds a few bytes to the output. However, | 3569 # TODO consider omitting frame magic to save 4 bytes. |
3570 # it allows decompression to be more optimal since we can | 3570 # This writes content sizes into the frame header. That is |
3571 # pre-allocate a buffer to hold the result. | 3571 # extra storage. But it allows a correct size memory allocation |
3572 self._cctx = zstd.ZstdCompressor(level=level, | 3572 # to hold the result. |
3573 write_content_size=True) | 3573 self._cctx = zstd.ZstdCompressor(level=level) |
3574 self._dctx = zstd.ZstdDecompressor() | 3574 self._dctx = zstd.ZstdDecompressor() |
3575 self._compinsize = zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE | 3575 self._compinsize = zstd.COMPRESSION_RECOMMENDED_INPUT_SIZE |
3576 self._decompinsize = zstd.DECOMPRESSION_RECOMMENDED_INPUT_SIZE | 3576 self._decompinsize = zstd.DECOMPRESSION_RECOMMENDED_INPUT_SIZE |
3577 | 3577 |
3578 def compress(self, data): | 3578 def compress(self, data): |