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
{header}
<title>{repo|escape}: {file|escape} history</title>
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href="{url|urlescape}atom-log/tip/{file|urlescape}" title="Atom feed for {repo|escape}:{file}">
<link rel="alternate" type="application/rss+xml"
href="{url|urlescape}rss-log/tip/{file|urlescape}" title="RSS feed for {repo|escape}:{file}">
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<body>
<div class="buttons">
<a href="{url|urlescape}log{sessionvars%urlparameter}">changelog</a>
<a href="{url|urlescape}shortlog{sessionvars%urlparameter}">shortlog</a>
<a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a>
<a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a>
<a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a>
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<h2><a href="/">Mercurial</a> {pathdef%breadcrumb} / {file|escape} revision history</h2>
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{footer}