protected override uint DecodePacket(out byte[] packet)
{
if (nextBlock >= codecInfo.Count)
{
// No more data
packet = null;
return(0);
}
packet = outputBuffer;
BlockCodecInfo info = codecInfo[nextBlock];
nextBlock++;
BinReader reader = currentChunk.GetReader(); // .IMX file
reader.Position = info.Offset;
reader.Read(inputBuffer, 0, info.CompressedSize);
uint result;
switch (info.Codec)
{
case 0x00: // Uncompressed
result = DecodeUncompressed(inputBuffer, packet, info.CompressedSize);
break;
case 0x01:
case 0x02: //
case 0x03: //
case 0x0A: //
case 0x0B: //
case 0x0C: //
packet = null;
result = 0;
break;
case 0x0D: //
result = DecodeVIMA(inputBuffer, packet, info.CompressedSize, 1);
break;
case 0x0F: //
result = DecodeVIMA(inputBuffer, packet, info.CompressedSize, 2);
break;
default:
throw new DecodingException("Unsupported IMC codec: {0}", info.Codec);
}
if (nextBlock >= codecInfo.Count)
{
result = lastBlockSize;
}
return(result);
}
protected void ReadCompressionTable(Chunk compChunk)
{
codecInfo = new List <BlockCodecInfo>();
BinReader reader = compChunk.GetReader();
reader.Position = 4;
uint count = reader.ReadU32BE();
reader.Position = 12;
lastBlockSize = reader.ReadU32BE();
reader.Position = 16;
for (int i = 0; i < count; i++)
{
BlockCodecInfo info = new BlockCodecInfo();
info.Offset = reader.ReadU32BE();
info.CompressedSize = reader.ReadU32BE();
info.Codec = reader.ReadS32BE();
uint skip = reader.ReadU32BE();
Debug.Assert(skip == 0, "Found unknown codec info != 0");
codecInfo.Add(info);
}
}
