/**
* Public constructor
* @param bitInputStream The BZip2BitInputStream from which Huffman codes are read
* @param alphabetSize The total number of codes (uniform for each table)
* @param tableCodeLengths The Canonical Huffman code lengths for each table
* @param selectors The Huffman table number to use for each group of 50 symbols
*/
public BZip2HuffmanStageDecoder(BZip2BitInputStream bitInputStream, int alphabetSize, byte[,] tableCodeLengths, byte[] selectors)
{
this.bitInputStream = bitInputStream;
this.selectors = selectors;
this.currentTable = this.selectors[0];
this.CreateHuffmanDecodingTables(alphabetSize, tableCodeLengths);
}
/// <summary>Public constructor</summary>
/// <param name="inputStream">The InputStream to wrap</param>
/// <param name="headerless">If true, the caller is assumed to have read away the stream's
/// leading "BZ" identifier bytes</param>
public BZip2InputStream(Stream inputStream, bool headerless)
{
if (inputStream == null)
{
throw new ArgumentException("Null input stream");
}
this.inputStream = inputStream;
this.bitInputStream = new BZip2BitInputStream(inputStream);
this.headerless = headerless;
}
public override void Close()
{
if (this.bitInputStream == null)
return;
this.streamComplete = true;
this.blockDecompressor = null;
this.bitInputStream = null;
try {
this.inputStream.Close();
} finally {
this.inputStream = null;
}
}
/**
* Public constructor
* @param bitInputStream The BZip2BitInputStream to read from
* @param blockSize The maximum decoded size of the block
* Exception If the block could not be decoded
*/
public BZip2BlockDecompressor(BZip2BitInputStream bitInputStream, uint blockSize)
{
this.bitInputStream = bitInputStream;
this.bwtBlock = new byte[blockSize];
// Read block header
this.blockCRC = this.bitInputStream.ReadInteger(); //.ReadBits(32);
this.blockRandomised = this.bitInputStream.ReadBoolean();
uint bwtStartPointer = this.bitInputStream.ReadBits(24);
// Read block data and decode through to the Inverse Burrows Wheeler Transform stage
var huffmanDecoder = this.ReadHuffmanTables();
this.DecodeHuffmanData(huffmanDecoder);
this.InitialiseInverseBWT(bwtStartPointer);
}
