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