//[TestMethod]
// Disabled for now. Decreases are not guaranteed symmetric with increases.
public void VerifyBulkUpdateDecrease()
{
string originalInput = "astrachan_";
var originalCompressor = new DynamicHuffman <char>(OriginalNYT);
var originalTreeState = new TreeStateStore();
for (int i = 0; i < originalInput.Length; ++i)
{
originalCompressor.WriteCode(originalInput[i], (bit) => { }, (symbol) => { });
}
originalCompressor.WriteTable(originalTreeState.WriteSymbol, originalTreeState.WriteUInt32,
originalTreeState.WriteNotYetTransmitted);
string partialInput = "astrachan";
var bulkCompressor = new DynamicHuffman <char>(OriginalNYT);
for (int i = 0; i < partialInput.Length; ++i)
{
bulkCompressor.WriteCode(partialInput[i], (bit) => { }, (symbol) => { });
}
bulkCompressor.UpdateSymbol('_', 8);
bulkCompressor.UpdateSymbol('_', -7);
var bulkTreeState = new TreeStateStore();
bulkCompressor.WriteTable(bulkTreeState.WriteSymbol, bulkTreeState.WriteUInt32,
bulkTreeState.WriteNotYetTransmitted);
CollectionAssert.AreEqual(originalTreeState, bulkTreeState);
}
public void VerifyCompression_LargeCorpus()
{
var stream = new MemoryStream();
var writer = new BitStreamWriter(stream, true);
var reader = new BitStreamReader(stream, true);
string input = TestResources.RFC5_Text;
var state = new TreeStateStore();
var compressor = new StaticHuffman <char>(CharacterFrequencies(input));
compressor.WriteTable(state.WriteSymbol, state.WriteUInt32);
foreach (char ch in input)
{
compressor.WriteCode(ch, writer.Write);
}
writer.Flush();
state.Reset();
var decompressor = new StaticHuffman <char>(state.ReadSymbol, state.ReadUInt32);
stream.Position = 0;
foreach (char ch in input)
{
Assert.AreEqual(ch, decompressor.GetSymbol(reader.ReadBoolean));
}
}