public override byte[] Compress(byte[] input, int DataOffset, VrPixelCodec PixelCodec, VrDataCodec DataCodec)
{
// We can't compress 4-bit textures
if (DataCodec.GetBpp(PixelCodec) < 8)
return input;
MemoryStream output = new MemoryStream();
int SourcePointer = DataOffset;
int DestPointer = DataOffset + 4;
int PixelSize = (DataCodec.GetBpp(PixelCodec) / 8);
using (BinaryWriter Writer = new BinaryWriter(output))
{
Writer.Write(input.Length); // Decompressed filesize
Writer.Write(input, 0x00, DataOffset); // Header
while (SourcePointer < input.Length)
{
byte[] pixel = new byte[PixelSize];
Array.Copy(input, SourcePointer, pixel, 0x00, PixelSize);
Writer.Write(pixel);
SourcePointer += PixelSize;
DestPointer += PixelSize;
int repeat = 0;
while (SourcePointer + PixelSize < input.Length && repeat < 255)
{
bool match =true;
for (int i = 0; i < PixelSize && match; i++)
{
if (input[SourcePointer + i] != pixel[i])
{
match = false;
break;
}
}
if (match)
{
repeat++;
SourcePointer += PixelSize;
}
else
break;
}
Writer.Write((byte)repeat);
DestPointer++;
}
Writer.Flush();
}
return output.ToArray();
}
public override byte[] Decompress(byte[] input, int DataOffset, VrPixelCodec PixelCodec, VrDataCodec DataCodec)
{
byte[] output = new byte[BitConverter.ToUInt32(input, 0x00)];
int SourcePointer = DataOffset;
int DestPointer = 0x00;
int PixelSize = (DataCodec.GetBpp(PixelCodec) / 8);
// Copy the header
if (DataOffset - 4 > 0)
{
Array.Copy(input, 0x04, output, 0x00, DataOffset - 4);
DestPointer += (DataOffset - 4);
}
// Decompress
while (SourcePointer < input.Length && DestPointer < output.Length)
{
int amount = input[SourcePointer + PixelSize] + 1;
for (int i = 0; i < amount; i++)
{
Array.Copy(input, SourcePointer, output, DestPointer, PixelSize);
DestPointer += PixelSize;
}
SourcePointer += PixelSize + 1;
}
return output;
}