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libutil: add makeDecompressionSource

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Change-Id: Iac7f24d79e24417436b9b5cbefd6af051aeea0a6
This commit is contained in:
eldritch horrors 2024-05-03 22:23:02 +02:00
parent 3425e90d76
commit 67f778670c
3 changed files with 23 additions and 10 deletions
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21
src/libutil/compression.cc
View file

@ -192,11 +192,9 @@ struct BrotliDecompressionSource : Source
std::string decompress(const std::string & method, std::string_view in) std::string decompress(const std::string & method, std::string_view in)
{ {
StringSink ssink; StringSource src{in};
auto sink = makeDecompressionSink(method, ssink); auto filter = makeDecompressionSource(method, src);
(*sink)(in); return filter->drain();
sink->finish();
return std::move(ssink.s);
} }
std::unique_ptr<FinishSink> makeDecompressionSink(const std::string & method, Sink & nextSink) std::unique_ptr<FinishSink> makeDecompressionSink(const std::string & method, Sink & nextSink)
@ -224,6 +222,19 @@ std::unique_ptr<FinishSink> makeDecompressionSink(const std::string & method, Si
}); });
} }
std::unique_ptr<Source> makeDecompressionSource(const std::string & method, Source & inner)
{
if (method == "none" || method == "") {
return std::make_unique<LambdaSource>([&](char * data, size_t len) {
return inner.read(data, len);
});
} else if (method == "br") {
return std::make_unique<BrotliDecompressionSource>(inner);
} else {
return std::make_unique<ArchiveDecompressionSource>(inner);
}
}
struct BrotliCompressionSink : ChunkedCompressionSink struct BrotliCompressionSink : ChunkedCompressionSink
{ {
Sink & nextSink; Sink & nextSink;

1
src/libutil/compression.hh
View file

@ -19,6 +19,7 @@ struct CompressionSink : BufferedSink, FinishSink
std::string decompress(const std::string & method, std::string_view in); std::string decompress(const std::string & method, std::string_view in);
std::unique_ptr<FinishSink> makeDecompressionSink(const std::string & method, Sink & nextSink); std::unique_ptr<FinishSink> makeDecompressionSink(const std::string & method, Sink & nextSink);
std::unique_ptr<Source> makeDecompressionSource(const std::string & method, Source & inner);
std::string compress(const std::string & method, std::string_view in, const bool parallel = false, int level = -1); std::string compress(const std::string & method, std::string_view in, const bool parallel = false, int level = -1);

11
tests/unit/libutil/compression.cc
View file

@ -81,16 +81,17 @@ namespace nix {
} }
TEST(makeCompressionSink, compressAndDecompress) { TEST(makeCompressionSink, compressAndDecompress) {
StringSink strSink;
auto inputString = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf"; auto inputString = "slfja;sljfklsa;jfklsjfkl;sdjfkl;sadjfkl;sdjf;lsdfjsadlf";
auto decompressionSink = makeDecompressionSink("bzip2", strSink);
auto sink = makeCompressionSink("bzip2", *decompressionSink);
StringSink strSink;
auto sink = makeCompressionSink("bzip2", strSink);
(*sink)(inputString); (*sink)(inputString);
sink->finish(); sink->finish();
decompressionSink->finish();
ASSERT_STREQ(strSink.s.c_str(), inputString); StringSource strSource{strSink.s};
auto decompressionSource = makeDecompressionSource("bzip2", strSource);
ASSERT_STREQ(decompressionSource->drain().c_str(), inputString);
} }
} }