private readonly int _maxBitLength; // maximum length in bits of a code
/// <summary>
/// Initializes a new instance of the <see cref="DeflateTree"/> class.
/// Literal Tree MinCodes = 257, MaxCodes = 286, MaxBitLength = 15
/// Distance Tree MinCodes = 2, MaxCodes = 30, MaxBitLength = 15
/// Bit Length Tree MinCodes = 4, MaxCodes = 19, MaxBitLength = 7
/// </summary>
/// <param name="writeBits">The write bits.</param>
/// <param name="minCodes">The minimum codes.</param>
/// <param name="maxCodes">The maximum codes.</param>
/// <param name="maxBitLength">Maximum length of the bit.</param>
public DeflateTree(WriteBits writeBits, int minCodes, int maxCodes, int maxBitLength)
{
// write bits method
_writeBits = writeBits;
// save minimum codes, maximum codes, and maximum bit length
_minCodes = minCodes;
_maxCodes = maxCodes;
_maxBitLength = maxBitLength;
// allocate arrays
CodeFreq = new int[maxCodes];
_saveCodeLength = new byte[maxCodes];
_saveCodes = new ushort[maxCodes];
_freqTree = new FreqNode[2 * maxCodes - 1];
_bitLengthFreq = new int[maxBitLength];
_firstCode = new int[maxBitLength];
// clear arrays
Reset();
}
private Int32 MaxBitLength; // maximum length in bits of a code
////////////////////////////////////////////////////////////////////
// Constructor
////////////////////////////////////////////////////////////////////
// Literal Tree MinCodes = 257, MaxCodes = 286, MaxBitLength = 15
// Distance Tree MinCodes = 2, MaxCodes = 30, MaxBitLength = 15
// Bit Length Tree MinCodes = 4, MaxCodes = 19, MaxBitLength = 7
public DeflateTree(WriteBits WriteBits, Int32 MinCodes, Int32 MaxCodes, Int32 MaxBitLength)
{
// write bits method
this.WriteBits = WriteBits;
// save minimum codes, maximum codes, and maximum bit length
this.MinCodes = MinCodes;
this.MaxCodes = MaxCodes;
this.MaxBitLength = MaxBitLength;
// allocate arrays
CodeFreq = new Int32[MaxCodes];
SaveCodeLength = new Byte[MaxCodes];
SaveCodes = new UInt16[MaxCodes];
FreqTree = new FreqNode[2 * MaxCodes - 1];
BitLengthFreq = new Int32[MaxBitLength];
FirstCode = new Int32[MaxBitLength];
// clear arrays
Reset();
return;
}
