From 3e6b194d78024373c2320f31f4ba0de3d0658b83 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Fri, 16 Mar 2018 16:59:31 +0100 Subject: decompress(): Use a Source and Sink This allows decompression to happen in O(1) memory. --- src/libutil/serialise.hh | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) (limited to 'src/libutil/serialise.hh') diff --git a/src/libutil/serialise.hh b/src/libutil/serialise.hh index 2ea5b6354..103b05767 100644 --- a/src/libutil/serialise.hh +++ b/src/libutil/serialise.hh @@ -56,7 +56,7 @@ struct Source void operator () (unsigned char * data, size_t len); /* Store up to ‘len’ in the buffer pointed to by ‘data’, and - return the number of bytes stored. If blocks until at least + return the number of bytes stored. It blocks until at least one byte is available. */ virtual size_t read(unsigned char * data, size_t len) = 0; @@ -175,6 +175,22 @@ struct TeeSource : Source }; +/* Convert a function into a sink. */ +struct LambdaSink : Sink +{ + typedef std::function lambda_t; + + lambda_t lambda; + + LambdaSink(const lambda_t & lambda) : lambda(lambda) { } + + virtual void operator () (const unsigned char * data, size_t len) + { + lambda(data, len); + } +}; + + void writePadding(size_t len, Sink & sink); void writeString(const unsigned char * buf, size_t len, Sink & sink); -- cgit v1.2.3