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Initial gzip support

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Closes #3256
This commit is contained in:
Tom Bereknyei 2019-12-13 03:29:33 -05:00
parent f800d450b7
commit c6295a3afd
5 changed files with 88 additions and 1 deletions
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64
src/libutil/compression.cc
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@ -11,6 +11,8 @@
#include <brotli/decode.h>
#include <brotli/encode.h>
#include <zlib.h>
#include <iostream>
namespace nix {
@ -42,6 +44,66 @@ struct NoneSink : CompressionSink
void write(const unsigned char * data, size_t len) override { nextSink(data, len); }
};
struct GzipDecompressionSink : CompressionSink
{
Sink & nextSink;
z_stream strm;
bool finished = false;
uint8_t outbuf[BUFSIZ];
GzipDecompressionSink(Sink & nextSink) : nextSink(nextSink)
{
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
strm.next_out = outbuf;
strm.avail_out = sizeof(outbuf);
// Enable gzip and zlib decoding (+32) with 15 windowBits
int ret = inflateInit2(&strm,15+32);
if (ret != Z_OK)
throw CompressionError("unable to initialise gzip encoder");
}
~GzipDecompressionSink()
{
inflateEnd(&strm);
}
void finish() override
{
CompressionSink::flush();
write(nullptr, 0);
}
void write(const unsigned char * data, size_t len) override
{
assert(len <= std::numeric_limits<decltype(strm.avail_in)>::max());
strm.next_in = (Bytef *) data;
strm.avail_in = len;
while (!finished && (!data || strm.avail_in)) {
checkInterrupt();
int ret = inflate(&strm,Z_SYNC_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
throw CompressionError("error while decompressing gzip file: %d: %d: %d",ret, len, strm.avail_in);
finished = ret == Z_STREAM_END;
if (strm.avail_out < sizeof(outbuf) || strm.avail_in == 0) {
nextSink(outbuf, sizeof(outbuf) - strm.avail_out);
strm.next_out = (Bytef *) outbuf;
strm.avail_out = sizeof(outbuf);
}
}
}
};
struct XzDecompressionSink : CompressionSink
{
Sink & nextSink;
@ -215,6 +277,8 @@ ref<CompressionSink> makeDecompressionSink(const std::string & method, Sink & ne
return make_ref<XzDecompressionSink>(nextSink);
else if (method == "bzip2")
return make_ref<BzipDecompressionSink>(nextSink);
else if (method == "gzip")
return make_ref<GzipDecompressionSink>(nextSink);
else if (method == "br")
return make_ref<BrotliDecompressionSink>(nextSink);
else