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TeeSink: Pre-reserve string space

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When receiving a very large file, this can prevent the string from
having tobe copied, which temporarily doubles memory consumption.
This commit is contained in:
Eelco Dolstra 2017-03-01 16:16:04 +01:00
parent f61f67ddee
commit fa125b9b28
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GPG key ID: 8170B4726D7198DE
3 changed files with 21 additions and 10 deletions
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13
src/libutil/archive.hh
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@ -70,6 +70,19 @@ struct ParseSink
virtual void createSymlink(const Path & path, const string & target) { };
};
struct TeeSink : ParseSink
{
TeeSource source;
TeeSink(Source & source) : source(source) { }
void preallocateContents(unsigned long long size) override
{
source.data->reserve(source.data->size() + size + 1024);
};
};
void parseDump(ParseSink & sink, Source & source);
void restorePath(const Path & path, Source & source);