47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include "compression.hh"
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#include "types.hh"
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#include <lzma.h>
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#include <cstdio>
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namespace nix {
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std::string decompressXZ(const std::string & in)
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{
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lzma_stream strm = LZMA_STREAM_INIT;
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lzma_ret ret = lzma_stream_decoder(
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&strm, UINT64_MAX, LZMA_CONCATENATED);
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if (ret != LZMA_OK)
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throw Error("unable to initialise lzma decoder");
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lzma_action action = LZMA_RUN;
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uint8_t outbuf[BUFSIZ];
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string res;
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strm.next_in = (uint8_t *) in.c_str();
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strm.avail_in = in.size();
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strm.next_out = outbuf;
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strm.avail_out = sizeof(outbuf);
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while (true) {
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if (strm.avail_in == 0)
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action = LZMA_FINISH;
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lzma_ret ret = lzma_code(&strm, action);
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if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
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res.append((char *) outbuf, sizeof(outbuf) - strm.avail_out);
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strm.next_out = outbuf;
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strm.avail_out = sizeof(outbuf);
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}
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if (ret == LZMA_STREAM_END)
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return res;
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if (ret != LZMA_OK)
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throw Error("error while decompressing xz file");
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}
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}
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}
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