release/src-rt-6.x/linux/linux-2.6/scripts/squashfs/lzma/Java/SevenZip/Compression/RangeCoder/BitTreeEncoder.java

   1 package SevenZip.Compression.RangeCoder;
   2 import java.io.IOException;
   3
   4 public class BitTreeEncoder
   5 {
   6         short[] Models;
   7         int NumBitLevels;
   8
   9         public BitTreeEncoder(int numBitLevels)
  10         {
  11                 NumBitLevels = numBitLevels;
  12                 Models = new short[1 << numBitLevels];
  13         }
  14
  15         public void Init()
  16         {
  17                 Decoder.InitBitModels(Models);
  18         }
  19
  20         public void Encode(Encoder rangeEncoder, int symbol) throws IOException
  21         {
  22                 int m = 1;
  23                 for (int bitIndex = NumBitLevels; bitIndex != 0; )
  24                 {
  25                         bitIndex--;
  26                         int bit = (symbol >>> bitIndex) & 1;
  27                         rangeEncoder.Encode(Models, m, bit);
  28                         m = (m << 1) | bit;
  29                 }
  30         }
  31
  32         public void ReverseEncode(Encoder rangeEncoder, int symbol) throws IOException
  33         {
  34                 int m = 1;
  35                 for (int  i = 0; i < NumBitLevels; i++)
  36                 {
  37                         int bit = symbol & 1;
  38                         rangeEncoder.Encode(Models, m, bit);
  39                         m = (m << 1) | bit;
  40                         symbol >>= 1;
  41                 }
  42         }
  43
  44         public int GetPrice(int symbol)
  45         {
  46                 int price = 0;
  47                 int m = 1;
  48                 for (int bitIndex = NumBitLevels; bitIndex != 0; )
  49                 {
  50                         bitIndex--;
  51                         int bit = (symbol >>> bitIndex) & 1;
  52                         price += Encoder.GetPrice(Models[m], bit);
  53                         m = (m << 1) + bit;
  54                 }
  55                 return price;
  56         }
  57
  58         public int ReverseGetPrice(int symbol)
  59         {
  60                 int price = 0;
  61                 int m = 1;
  62                 for (int i = NumBitLevels; i != 0; i--)
  63                 {
  64                         int bit = symbol & 1;
  65                         symbol >>>= 1;
  66                         price += Encoder.GetPrice(Models[m], bit);
  67                         m = (m << 1) | bit;
  68                 }
  69                 return price;
  70         }
  71
  72         public static int ReverseGetPrice(short[] Models, int startIndex,
  73                         int NumBitLevels, int symbol)
  74         {
  75                 int price = 0;
  76                 int m = 1;
  77                 for (int i = NumBitLevels; i != 0; i--)
  78                 {
  79                         int bit = symbol & 1;
  80                         symbol >>>= 1;
  81                         price += Encoder.GetPrice(Models[startIndex + m], bit);
  82                         m = (m << 1) | bit;
  83                 }
  84                 return price;
  85         }
  86
  87         public static void ReverseEncode(short[] Models, int startIndex,
  88                         Encoder rangeEncoder, int NumBitLevels, int symbol) throws IOException
  89         {
  90                 int m = 1;
  91                 for (int i = 0; i < NumBitLevels; i++)
  92                 {
  93                         int bit = symbol & 1;
  94                         rangeEncoder.Encode(Models, startIndex + m, bit);
  95                         m = (m << 1) | bit;
  96                         symbol >>= 1;
  97                 }
  98         }
  99 }