public long Encode(IEncodingInputStream inputStream, IEncodingOutputStream outputStream, EncodingToken encodingToken, CancellationToken cancellationToken, IProgressHandler progress)
{
Guard.IsNotNull(inputStream, nameof(inputStream));
Guard.IsNotNull(outputStream, nameof(outputStream));
Guard.IsNotNull(encodingToken, nameof(encodingToken));
CodingTable codingTable = encodingToken.CodingTable;
inputStream.Reset();
long sequenceLength = 0;
long progressValue = progress?.State.CastTo <CodingProgressState>()?.Value ?? 0;
while (inputStream.ReadSymbol(out byte symbol))
{
BitSequence codingSequence = codingTable[symbol];
for (int n = 0; n < codingSequence.Size; n++)
{
Bit bit = codingSequence[n];
sequenceLength++;
outputStream.WriteBit(bit);
}
// Throttling
if (++progressValue == ChunkSize)
{
cancellationToken.ThrowIfCancellationRequested();
progress?.Report(ChunkSize, inputStream.Path);
progressValue = 0;
}
}
if (progress != null)
{
CodingProgressState progressState = (CodingProgressState)progress.State ?? new CodingProgressState();
progress.State = progressState.WithValue(progressValue);
}
return(sequenceLength);
}
public void Decode(IDecodingInputStream inputStream, HuffmanTreeBase tree, IDecodingOutputStream outputStream, long sequenceLength, CancellationToken cancellationToken, IProgressHandler progress)
{
Guard.IsNotNull(inputStream, nameof(inputStream));
Guard.IsNotNull(tree, nameof(tree));
Guard.IsNotNull(outputStream, nameof(outputStream));
Guard.IsNotNegative(sequenceLength, nameof(sequenceLength));
const int chunkSize = 0x20000 * 8; // 128Kb
long progressValue = progress?.State.CastTo <CodingProgressState>()?.Value ?? 0;
long streamPosition = inputStream.Position;
TreeWalker walker = new TreeWalker(tree, inputStream, outputStream, sequenceLength);
while (!walker.Exhausted && !inputStream.IsEmpty)
{
if (!tree.Walk(walker))
{
throw new ArgumentException();
}
// Throttling
progressValue += inputStream.Position - streamPosition;
streamPosition = inputStream.Position;
if (progressValue >= chunkSize)
{
cancellationToken.ThrowIfCancellationRequested();
progress?.Report(progressValue / 8, outputStream.Path);
progressValue %= 8;
}
}
if (progress != null)
{
CodingProgressState progressState = (CodingProgressState)progress.State ?? new CodingProgressState();
progress.State = progressState.WithValue(progressValue);
}
}
