/// <summary>
/// Decompresses LZMA. Uses native code if non-streamed (produced by lzma.exe), uses managed code if streamed (which can be done by things such as PHP)
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static byte[] DecompressLZMA(MemoryStream input)
{
input.Position = 5;
var lzmaLen = input.ReadInt32();
input.Position = 0;
if (lzmaLen > 0)
{
// Non streamed LZMA
return(LZMA.DecompressLZMAFile(input.ToArray()));
}
else
{
// It's streaming lzma. MEM code can't handle streamed so we have to fallback
var lzmads = new LzmaDecodeStream(input);
using var decompressedStream = new MemoryStream();
int bufSize = 24576, count;
byte[] buf = new byte[bufSize];
while (/*lzmads.Position < lzmaFile.Length && */ (count = lzmads.Read(buf, 0, bufSize)) > 0)
{
decompressedStream.Write(buf, 0, count);
}
return(decompressedStream.ToArray());
}
}
