public void DecodeDifBitsTest()
{
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0));
Assert.AreEqual(-1, HuffmanTable.DecodeDifBits(1, 0));
Assert.AreEqual(1, HuffmanTable.DecodeDifBits(1, 1));
Assert.AreEqual(-3, HuffmanTable.DecodeDifBits(2, 0));
Assert.AreEqual(-2, HuffmanTable.DecodeDifBits(2, 1));
Assert.AreEqual(2, HuffmanTable.DecodeDifBits(2, 2));
Assert.AreEqual(3, HuffmanTable.DecodeDifBits(2, 3));
Assert.AreEqual(-7, HuffmanTable.DecodeDifBits(3, 0));
Assert.AreEqual(-6, HuffmanTable.DecodeDifBits(3, 1));
Assert.AreEqual(-5, HuffmanTable.DecodeDifBits(3, 2));
Assert.AreEqual(-4, HuffmanTable.DecodeDifBits(3, 3));
Assert.AreEqual(4, HuffmanTable.DecodeDifBits(3, 4));
Assert.AreEqual(5, HuffmanTable.DecodeDifBits(3, 5));
Assert.AreEqual(6, HuffmanTable.DecodeDifBits(3, 6));
Assert.AreEqual(7, HuffmanTable.DecodeDifBits(3, 7));
for (var bits = 4; bits < 16; bits++)
{
var x = 0x01u << bits;
var y = 0x01u << (bits - 1);
for (var codes = 0u; codes < (0x01u << bits); codes++)
{
if (codes < y)
{
var expected = -x + 1 + codes;
Assert.AreEqual((short)expected, HuffmanTable.DecodeDifBits((ushort)bits, (ushort)codes));
}
else
{
var expected = codes;
Assert.AreEqual((short)expected, HuffmanTable.DecodeDifBits((ushort)bits, (ushort)codes));
}
}
}
// Assert.AreEqual(32768, HuffmanTable.DecodeDifBits(16, 0));
}
public void GetValuesTest()
{
var table0 = new HuffmanTable(0,
new byte[] { 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00 },
new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F });
Console.WriteLine("Table 0 {0}", table0);
var table1 = new HuffmanTable(1,
new byte[] { 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00 },
new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F });
Console.WriteLine("Table 1 {0}", table1);
var data = new byte[] { 0xff, 0x00, 0xe0, 0x0b, 0xa2, 0x89, 0x68, 0xc7, 0x00, 0xb0 };
using (var memory = new MemoryStream(data))
using (var reader = new BinaryReader(memory))
{
var imageData = new ImageData(reader, (uint)data.Length);
var prevY = 0x4000u;
var prevCb = 0x0000;
var prevCr = 0x0000;
Assert.AreEqual(14, imageData.GetValue(table0));
Assert.AreEqual(0x2E, imageData.GetValue(14));
Assert.AreEqual(-16337, HuffmanTable.DecodeDifBits(14, 0x2E));
prevY -= 16337;
Assert.AreEqual(47u, prevY);
Assert.AreEqual(3, imageData.GetValue(table0));
Assert.AreEqual(0x2, imageData.GetValue(3));
Assert.AreEqual(-5, HuffmanTable.DecodeDifBits(3, 0x2));
prevY -= 5;
Assert.AreEqual(42u, prevY);
Assert.AreEqual(2, imageData.GetValue(table1));
Assert.AreEqual(0x0, imageData.GetValue(2));
Assert.AreEqual(-3, HuffmanTable.DecodeDifBits(2, 0x0));
prevCb += -3;
// Assert.AreEqual(16381, prevCb);
Assert.AreEqual(-3, prevCb);
Assert.AreEqual(2, imageData.GetValue(table1));
Assert.AreEqual(0x1, imageData.GetValue(2));
Assert.AreEqual(-2, HuffmanTable.DecodeDifBits(2, 0x1));
prevCr += -2;
//Assert.AreEqual(16382, prevCr);
Assert.AreEqual(-2, prevCr);
Assert.AreEqual(2, imageData.GetValue(table0));
Assert.AreEqual(0x1, imageData.GetValue(2));
Assert.AreEqual(-2, HuffmanTable.DecodeDifBits(2, 0x1));
prevY -= 2;
Assert.AreEqual(40u, prevY);
Assert.AreEqual(0, imageData.GetValue(table0));
Assert.AreEqual(0x0, imageData.GetValue(0));
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0));
prevY += 0;
Assert.AreEqual(40u, prevY);
Assert.AreEqual(1, imageData.GetValue(table1));
Assert.AreEqual(0x1, imageData.GetValue(1));
Assert.AreEqual(1, HuffmanTable.DecodeDifBits(1, 0x1));
prevCb += 1;
//Assert.AreEqual(16382, prevCb);
Assert.AreEqual(-2, prevCb);
Assert.AreEqual(0, imageData.GetValue(table1));
Assert.AreEqual(0x0, imageData.GetValue(0));
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0x0));
prevCr += 0;
// Assert.AreEqual(16382, prevCr);
Assert.AreEqual(-2, prevCr);
Assert.AreEqual(2, imageData.GetValue(table0));
Assert.AreEqual(0x2, imageData.GetValue(2));
Assert.AreEqual(2, HuffmanTable.DecodeDifBits(2, 0x2));
prevY += 2;
Assert.AreEqual(42u, prevY);
Assert.AreEqual(0, imageData.GetValue(table0));
Assert.AreEqual(0x0, imageData.GetValue(0));
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0));
prevY += 0;
Assert.AreEqual(42u, prevY);
Assert.AreEqual(0, imageData.GetValue(table1));
Assert.AreEqual(0x0, imageData.GetValue(0));
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0x0));
prevCb += 0;
// Assert.AreEqual(16382, prevCb);
Assert.AreEqual(-2, prevCb);
Assert.AreEqual(0, imageData.GetValue(table1));
Assert.AreEqual(0x0, imageData.GetValue(0));
Assert.AreEqual(0, HuffmanTable.DecodeDifBits(0, 0x0));
prevCr += 0;
// Assert.AreEqual(16382, prevCr);
Assert.AreEqual(-2, prevCr);
}
}
