From 91b00b145f0c50e346d0250168cbcbcba7aa3b40 Mon Sep 17 00:00:00 2001 From: zimbatm Date: Mon, 12 Aug 2019 21:03:48 +0200 Subject: [PATCH] libutil: add SizedSource Introduce the SizeSource which allows to bound how much data is being read from a source. It also contains a drainAll() function to discard the rest of the source, useful to keep the nix protocol in sync. --- src/libutil/serialise.hh | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/src/libutil/serialise.hh b/src/libutil/serialise.hh index 969e4dff3..a344a5ac7 100644 --- a/src/libutil/serialise.hh +++ b/src/libutil/serialise.hh @@ -179,6 +179,36 @@ struct TeeSource : Source } }; +/* A reader that consumes the original Source until 'size'. */ +struct SizedSource : Source +{ + Source & orig; + size_t remain; + SizedSource(Source & orig, size_t size) + : orig(orig), remain(size) { } + size_t read(unsigned char * data, size_t len) + { + if (this->remain <= 0) { + throw EndOfFile("sized: unexpected end-of-file"); + } + len = std::min(len, this->remain); + size_t n = this->orig.read(data, len); + this->remain -= n; + return n; + } + + /* Consume the original source until no remain data is left to consume. */ + size_t drainAll() + { + std::vector buf(8192); + size_t sum = 0; + while (this->remain > 0) { + size_t n = read(buf.data(), buf.size()); + sum += n; + } + return sum; + } +}; /* Convert a function into a sink. */ struct LambdaSink : Sink