internal CodeTable(byte[] bytes)
{
for (int i=0; i < 256; i++)
{
entries[i,0] = new Instruction((InstructionType)bytes[i], bytes[i+512], bytes[i+1024]);
entries[i,1] = new Instruction((InstructionType)bytes[i+256], bytes[i+768], bytes[i+1280]);
}
}
internal CodeTable(Instruction[,] entries)
{
if (entries==null)
{
throw new ArgumentNullException("entries");
}
if (entries.Rank != 2)
{
throw new ArgumentException ("Array must be rectangular.", "entries");
}
if (entries.GetLength(0) != 256)
{
throw new ArgumentException ("Array must have outer length 256.", "entries");
}
if (entries.GetLength(1) != 2)
{
throw new ArgumentException ("Array must have inner length 256.", "entries");
}
Array.Copy (entries, 0, this.entries, 0, 512);
}
/// <summary>
/// Builds the default code table specified in RFC 3284
/// </summary>
/// <returns>
/// The default code table.
/// </returns>
static CodeTable BuildDefaultCodeTable()
{
// Defaults are NoOps with size and mode 0.
Instruction[,] entries = new Instruction[256,2];
entries[0, 0] = new Instruction(InstructionType.Run, 0, 0);
for (byte i=0; i < 18; i++)
{
entries[i+1, 0] = new Instruction(InstructionType.Add, i, 0);
}
int index = 19;
// Entries 19-162
for (byte mode = 0; mode < 9; mode++)
{
entries[index++, 0] = new Instruction (InstructionType.Copy, 0, mode);
for (byte size = 4; size < 19; size++)
{
entries[index++, 0] = new Instruction (InstructionType.Copy, size, mode);
}
}
// Entries 163-234
for (byte mode = 0; mode < 6; mode++)
{
for (byte addSize = 1; addSize < 5; addSize++)
{
for (byte copySize = 4; copySize < 7; copySize++)
{
entries[index, 0] = new Instruction (InstructionType.Add, addSize, 0);
entries[index++, 1] = new Instruction (InstructionType.Copy, copySize, mode);
}
}
}
// Entries 235-246
for (byte mode = 6; mode < 9; mode++)
{
for (byte addSize = 1; addSize < 5; addSize++)
{
entries[index, 0] = new Instruction (InstructionType.Add, addSize, 0);
entries[index++, 1] = new Instruction (InstructionType.Copy, 4, mode);
}
}
// Entries 247-255
for (byte mode = 0; mode < 9; mode++)
{
entries[index, 0] = new Instruction (InstructionType.Copy, 4, mode);
entries[index++, 1] = new Instruction (InstructionType.Add, 1, 0);
}
return new CodeTable(entries);
}
