public void Decompress(int unpackedLength)
{
while (unpackedLength > 0)
{
int flag = (byte)_input.ReadByte();
if (flag == 0)
{
return;
}
// RAW
if (flag < 0x7E)
{
while (flag-- > 0)
{
byte b = (byte)_input.ReadByte();
_circularBuffer.Write(b);
_output.WriteByte(b);
unpackedLength--;
}
continue;
}
// RLE
if (flag >= 0x7E && flag <= 0x7F)
{
int length = _input.ReadByte();
if (flag == 0x7E) // Однобайтная длина
{
length += 4;
}
else
{
length |= (_input.ReadByte() << 8); // Двухбайтная длина
}
byte b = (byte)_input.ReadByte();
while (length-- > 0)
{
_circularBuffer.Write(b);
_output.WriteByte(b);
unpackedLength--;
}
continue;
}
// LZ
flag -= 0x80;
int offset = (byte)_input.ReadByte() + (flag % 0x8) * 0x100;
flag = (byte)(3 + (flag / 0x8));
for (int i = 0; i < flag; i++)
{
int index = (int)(_circularBuffer.Index - offset - 1);
byte b = _circularBuffer.GetByOffset(index);
_circularBuffer.Write(b);
_output.WriteByte(b);
unpackedLength--;
}
}
ReverseProgress.NullSafeInvoke(this, unpackedLength);
}
public void Decompress(int unpackedLength)
{
byte bits = 0, bitsCount = 0;
while (unpackedLength != 0)
{
int b = _input.ReadByte();
if (b == -1)
{
throw new Exception("Непредвиденный конец входного потока.");
}
if (_input.Position % 256 == 0)
{
ReverseProgress.NullSafeInvoke(this, unpackedLength);
}
byte current = (byte)b;
if (bitsCount == 0)
{
bits = current;
bitsCount = 8;
continue;
}
if ((bits & 1) != 0)
{
_output.WriteByte(current);
_circularBuffer.Write(current);
unpackedLength--;
}
else
{
short offset = current;
b = _input.ReadByte();
if (b == -1)
{
throw new Exception("Непредвиденный конец входного потока.");
}
current = (byte)b;
offset += (short)((current & 0xF0) << 4);
short length = (short)((current & 0xF) + 3);
for (int i = offset + 18; --length >= 0; i++)
{
i &= 0xFFF;
current = _circularBuffer.GetByOffset(i);
_output.WriteByte(current);
_circularBuffer.Write(current);
unpackedLength--;
}
}
bits >>= 1;
bitsCount--;
}
ReverseProgress.NullSafeInvoke(this, unpackedLength);
}