Mercurial > public > mercurial-scm > hg-stable
diff 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> |
|---|---|
| date | Mon, 09 Apr 2018 10:18:10 -0700 |
| parents | 9ecb7c471cfb |
| children | 5b8a260769a2 |
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--- a/mercurial/util.py Mon Apr 09 10:13:29 2018 -0700 +++ b/mercurial/util.py Mon Apr 09 10:18:10 2018 -0700 @@ -3566,11 +3566,11 @@ 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) + # 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