/**
* Public constructor
* @param bitOutputStream The BZip2BitOutputStream to write to
* @param mtfBlock The MTF block data
* @param mtfLength The actual length of the MTF block
* @param mtfAlphabetSize The size of the MTF block's alphabet
* @param mtfSymbolFrequencies The frequencies the MTF block's symbols
*/
public BZip2HuffmanStageEncoder(BZip2BitOutputStream bitOutputStream, ushort[] mtfBlock, int mtfLength, int mtfAlphabetSize, int[] mtfSymbolFrequencies)
{
this.bitOutputStream = bitOutputStream;
this.mtfBlock = mtfBlock;
this.mtfSymbolFrequencies = mtfSymbolFrequencies;
this.mtfAlphabetSize = mtfAlphabetSize;
this.mtfLength = mtfLength;
var totalTables = selectTableCount(mtfLength);
this.huffmanCodeLengths = new int[totalTables, mtfAlphabetSize];
this.huffmanMergedCodeSymbols = new int[totalTables, mtfAlphabetSize];
this.selectors = new byte[(mtfLength + HUFFMAN_GROUP_RUN_LENGTH - 1) / HUFFMAN_GROUP_RUN_LENGTH];
}
/// <summary>Public constructor</summary>
/// <param name="outputStream">The output stream to write to</param>
/// <param name="blockSizeMultiplier">The BZip2 block size as a multiple of 100,000 bytes (minimum 1, maximum 9)</param>
/// <param name="isOwner">True if the underlying stream will be closed with the current Stream</param>
/// <exception>On any I/O error writing to the output stream</exception>
/// <remarks>Larger block sizes require more memory for both compression and decompression,
/// but give better compression ratios. 9 will usually be the best value to use</remarks>
public BZip2OutputStream(Stream outputStream, bool isOwner = true, int blockSizeMultiplier = 9)
{
if (outputStream == null)
throw new ArgumentException("Null output stream");
if ((blockSizeMultiplier < 1) || (blockSizeMultiplier > 9))
throw new ArgumentException("Invalid BZip2 block size" + blockSizeMultiplier);
this.streamBlockSize = blockSizeMultiplier * 100000;
this.outputStream = outputStream;
this.bitOutputStream = new BZip2BitOutputStream(this.outputStream);
this.isOwner = isOwner;
this.bitOutputStream.WriteBits(16, STREAM_START_MARKER_1);
this.bitOutputStream.WriteBits(8, STREAM_START_MARKER_2);
this.bitOutputStream.WriteBits(8, (uint)('0' + blockSizeMultiplier));
this.InitialiseNextBlock();
}
