public void HasCode_Test()
{
byte runSizeInput1 = 00000000;
ushort codeWordInput1 = 2; // 10 in base 2
byte lengthInput1 = 8; // 1000 in base 2
byte runSizeInput2 = 1;
ushort codeWordInput2 = 3; // 11 in base 2
byte lengthInput2 = 8; // 1000 in base 2
HuffmanElement huffmanTestElement1 = new HuffmanElement(runSizeInput1, codeWordInput1, lengthInput1);
HuffmanElement huffmanTestElement2 = new HuffmanElement(runSizeInput2, codeWordInput2, lengthInput2);
HuffmanTable huffTable1 = new HuffmanTable(huffmanTestElement1, huffmanTestElement2);
Assert.AreEqual(0, huffTable1.HasCode(2, 8).RunSize);
}
public void HasCodeTest_for_null_when_no_element_has_code()
{
byte runSizeInput1 = 00000000;
ushort codeWordInput1 = 2; // 10 in base 2
byte lengthInput1 = 8; // 1000 in base 2
byte runSizeInput2 = 1;
ushort codeWordInput2 = 3; // 11 in base 2
byte lengthInput2 = 8; // 1000 in base 2
HuffmanElement huffmanTestElement1 = new HuffmanElement(runSizeInput1, codeWordInput1, lengthInput1);
HuffmanElement huffmanTestElement2 = new HuffmanElement(runSizeInput2, codeWordInput2, lengthInput2);
HuffmanTable huffTable1 = new HuffmanTable(huffmanTestElement1, huffmanTestElement2);
Assert.AreEqual(null, huffTable1.HasCode(1, 8));
}
// Gets the runsize and returns the amount of read zeroes and the decoded huffman value
private int nextValue(BitList bits, ref int index, HuffmanTable huffmanTable, out int zeroes) {
HuffmanElement e = null;
int i;
ushort code = 0;
for (i = 1; i <= 16; i++) {
code <<= 1;
code += (ushort)(bits[index] ? 1 : 0);
index++;
e = huffmanTable.HasCode(code, i);
if (e != null) {
break;
}
}
if (e == null) {
throw new ArgumentNullException();
}
zeroes = (e.RunSize & 0xF0) >> 4;
int category = e.RunSize & 0xF;
ushort value = 0;
for (i = 0; i < category; i++) {
value <<= 1;
value += (ushort)(bits[index] ? 1 : 0);
index++;
}
return lookupValue(value, category);
}
