public static void Decompress(Stream input, Stream output, Action <long, long> onProgress = null)
{
var decoder = new Decoder();
byte[] properties = new byte[5];
if (input.Read(properties, 0, 5) != 5)
{
throw new Exception("input .lzma is too short");
}
decoder.SetDecoderProperties(properties);
long fileLength = 0;
for (int i = 0; i < 8; i++)
{
int v = input.ReadByte();
if (v < 0)
{
throw new Exception("Can't Read 1");
}
fileLength |= ((long)(byte)v) << (8 * i);
}
ICodeProgress prg = null;
if (onProgress != null)
{
prg = new DelegateCodeProgress(onProgress);
}
long compressedSize = input.Length - input.Position;
decoder.Code(input, output, compressedSize, fileLength, prg);
}
public static void Compress(Stream input, Stream output, LzmaSpeed speed = LzmaSpeed.Fastest, DictionarySize dictionarySize = DictionarySize.VerySmall, Action <long, long> onProgress = null)
{
int posStateBits = 2; // default: 2
int litContextBits = 3; // 3 for normal files, 0; for 32-bit data
int litPosBits = 0; // 0 for 64-bit data, 2 for 32-bit.
var numFastBytes = (int)speed;
string matchFinder = "BT4"; // default: BT4
bool endMarker = true;
CoderPropID[] propIDs =
{
CoderPropID.DictionarySize,
CoderPropID.PosStateBits, // (0 <= x <= 4).
CoderPropID.LitContextBits, // (0 <= x <= 8).
CoderPropID.LitPosBits, // (0 <= x <= 4).
CoderPropID.NumFastBytes,
CoderPropID.MatchFinder, // "BT2", "BT4".
CoderPropID.EndMarker
};
object[] properties =
{
(int)dictionarySize,
posStateBits,
litContextBits,
litPosBits,
numFastBytes,
matchFinder,
endMarker
};
var lzmaEncoder = new Encoder();
lzmaEncoder.SetCoderProperties(propIDs, properties);
lzmaEncoder.WriteCoderProperties(output);
var fileSize = input.Length;
for (int i = 0; i < 8; i++)
{
output.WriteByte((byte)(fileSize >> (8 * i)));
}
ICodeProgress prg = null;
if (onProgress != null)
{
prg = new DelegateCodeProgress(onProgress);
}
lzmaEncoder.Code(input, output, -1, -1, prg);
}