| public static DecompressMemory ( byte original, byte delta ) : byte[] | ||
| original | byte | The original block of memory. |
| delta | byte | The RLE-compressed set of differences, /// prefixed with a 4-byte length. This length may be larger than /// the original block, but not smaller. |
| return | byte[] | |
public static byte[] DecompressMemory(byte[] original, byte[] delta)
{
MemoryStream mstr = new MemoryStream(delta);
uint length = BigEndian.ReadInt32(mstr);
if (length < original.Length)
throw new ArgumentException("Compressed block's length tag must be no less than original block's size");
byte[] result = new byte[length];
int rp = 0;
for (int i = 4; i < delta.Length; i++)
{
byte b = delta[i];
if (b == 0)
{
int repeats = delta[++i] + 1;
Array.Copy(original, rp, result, rp, repeats);
rp += repeats;
}
else
{
result[rp] = (byte)(original[rp] ^ b);
rp++;
}
}
while (rp < original.Length)
{
result[rp] = original[rp];
rp++;
}
return result;
}
