public void Extract(SequentialReader reader, HuffmanTablesDirectory directory)
{
try
{
while (reader.Available() > 0)
{
byte header = reader.GetByte();
HuffmanTableClass tableClass = HuffmanTable.TypeOf((header & 0xF0) >> 4);
int tableDestinationId = header & 0xF;
byte[] lBytes = GetBytes(reader, 16);
int vCount = 0;
foreach (byte b in lBytes)
{
vCount += (b & 0xFF);
}
byte[] vBytes = GetBytes(reader, vCount);
directory.AddTable(new HuffmanTable(tableClass, tableDestinationId, lBytes, vBytes));
}
}
catch (IOException me)
{
directory.AddError(me.ToString());
}
}
public BoxLocation(SequentialReader reader)
{
Origin = (ulong)reader.Position;
// Four bytes for the length
Length = reader.GetUInt32();
// Four bytes for the type (4CC, in ASCII)
Type = reader.GetUInt32();
// Handle special length values
Length = Length switch
{
// A length of 0 means the box continues until the end of the stream
0 => (ulong)reader.Available(), // Include 8 bytes for length/type
// A length of 1 means the length is stored in 64 bits
1 => reader.GetUInt64(),
// The length is fine so keep it
_ => Length
};
}
}