public Decoder(int sampleRate)
{
peakDetector = new PeakDetector(this);
bitDecoder = new BitDecoder(this, sampleRate);
symbolDecoder = new SymbolDecoder(this);
Clear();
}
public byte[] Decompress(byte[] input, int len)
{
for (int i = 0; i < SymbolProbabilities.Length; i++)
{
SymbolProbabilities[i].Init();
}
for (int i = 0; i < DistanceSizeProbabilities.Length; i++)
{
DistanceSizeProbabilities[i].Init();
}
Decoder = new BitDecoder(input);
var output = new byte[len];
output[0] = (byte)DecodeSymbol(0);
for (int i = 1; i < len;)
{
int symbol = DecodeSymbol(output[i - 1]);
if (symbol < 256) // Literal
{
output[i++] = (byte)symbol;
}
else // Match
{
int matchLen = symbol - 256;
int distance = DecodeDistance();
while (matchLen-- > 0)
{
byte data = output[i - distance];
output[i++] = data;
}
}
}
return(output);
}
public LenDecoder()
{
BitDecoder decoder = new BitDecoder();
this.m_Choice = decoder;
BitDecoder decoder2 = new BitDecoder();
this.m_Choice2 = decoder2;
this.m_LowCoder = new BitTreeDecoder[0x10];
this.m_MidCoder = new BitTreeDecoder[0x10];
this.m_HighCoder = new BitTreeDecoder(8);
}
public static uint ReverseDecode(BitDecoder[] Models, UInt32 startIndex,
RangeCoder.Decoder rangeDecoder, int NumBitLevels)
{
uint m = 1;
uint symbol = 0;
for (int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
{
uint bit = Models[startIndex + m].Decode(rangeDecoder);
m <<= 1;
m += bit;
symbol |= (bit << bitIndex);
}
return symbol;
}
public static uint ReverseDecode(BitDecoder[] models, uint startIndex,
Decoder rangeDecoder, int numBitLevels)
{
uint m = 1;
uint symbol = 0;
for (var bitIndex = 0; bitIndex < numBitLevels; bitIndex++)
{
var bit = models[startIndex + m].Decode(rangeDecoder);
m <<= 1;
m += bit;
symbol |= (bit << bitIndex);
}
return symbol;
}
private static StringBuilder DoDecompress(string inputStream, DataEncoding encoding)
{
if ("" == inputStream)
{
return(null);
}
else
{
var result = new StringBuilder();
if (null == inputStream)
{
return(result);
}
else
{
var decompressor = new Decompressor(result);
var decoder = new BitDecoder(inputStream, encoding);
decompressor.Decompress(decoder);
return(result);
}
}
}
