public void ParseDHT()
{
uint headerLength = (uint)input.ReadInt16() - 2; // Subtract myself
while (headerLength != 0)
{
uint b = input.ReadByte();
uint Tc = (b >> 4);
if (Tc != 0)
{
throw new RawDecoderException("Unsupported Table class.");
}
uint Th = b & 0xf;
if (Th > 3)
{
throw new RawDecoderException("Invalid huffman table destination id.");
}
uint acc = 0;
HuffmanTable table = huff[Th];
if (table.Initialized)
{
throw new RawDecoderException("Duplicate table definition");
}
for (int i = 0; i < 16; i++)
{
table.bits[i + 1] = input.ReadByte();
acc += table.bits[i + 1];
}
table.bits[0] = 0;
if (acc > 256)
{
throw new RawDecoderException("Invalid DHT table.");
}
if (headerLength < 1 + 16 + acc)
{
throw new RawDecoderException("Invalid DHT table length.");
}
for (int i = 0; i < acc; i++)
{
table.huffval[i] = input.ReadByte();
}
table.Create(frame.precision);
headerLength -= 1 + 16 + acc;
}
}
