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      1 // Base.java
      2 
      3 package SevenZip.Compression.LZMA;
      4 
      5 public class Base
      6 {
      7 	public static final int kNumRepDistances = 4;
      8 	public static final int kNumStates = 12;
      9 
     10 	public static final int StateInit()
     11 	{
     12 		return 0;
     13 	}
     14 
     15 	public static final int StateUpdateChar(int index)
     16 	{
     17 		if (index < 4)
     18 			return 0;
     19 		if (index < 10)
     20 			return index - 3;
     21 		return index - 6;
     22 	}
     23 
     24 	public static final int StateUpdateMatch(int index)
     25 	{
     26 		return (index < 7 ? 7 : 10);
     27 	}
     28 
     29 	public static final int StateUpdateRep(int index)
     30 	{
     31 		return (index < 7 ? 8 : 11);
     32 	}
     33 
     34 	public static final int StateUpdateShortRep(int index)
     35 	{
     36 		return (index < 7 ? 9 : 11);
     37 	}
     38 
     39 	public static final boolean StateIsCharState(int index)
     40 	{
     41 		return index < 7;
     42 	}
     43 
     44 	public static final int kNumPosSlotBits = 6;
     45 	public static final int kDicLogSizeMin = 0;
     46 	// public static final int kDicLogSizeMax = 28;
     47 	// public static final int kDistTableSizeMax = kDicLogSizeMax * 2;
     48 
     49 	public static final int kNumLenToPosStatesBits = 2; // it's for speed optimization
     50 	public static final int kNumLenToPosStates = 1 << kNumLenToPosStatesBits;
     51 
     52 	public static final int kMatchMinLen = 2;
     53 
     54 	public static final int GetLenToPosState(int len)
     55 	{
     56 		len -= kMatchMinLen;
     57 		if (len < kNumLenToPosStates)
     58 			return len;
     59 		return (int)(kNumLenToPosStates - 1);
     60 	}
     61 
     62 	public static final int kNumAlignBits = 4;
     63 	public static final int kAlignTableSize = 1 << kNumAlignBits;
     64 	public static final int kAlignMask = (kAlignTableSize - 1);
     65 
     66 	public static final int kStartPosModelIndex = 4;
     67 	public static final int kEndPosModelIndex = 14;
     68 	public static final int kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;
     69 
     70 	public static final  int kNumFullDistances = 1 << (kEndPosModelIndex / 2);
     71 
     72 	public static final  int kNumLitPosStatesBitsEncodingMax = 4;
     73 	public static final  int kNumLitContextBitsMax = 8;
     74 
     75 	public static final  int kNumPosStatesBitsMax = 4;
     76 	public static final  int kNumPosStatesMax = (1 << kNumPosStatesBitsMax);
     77 	public static final  int kNumPosStatesBitsEncodingMax = 4;
     78 	public static final  int kNumPosStatesEncodingMax = (1 << kNumPosStatesBitsEncodingMax);
     79 
     80 	public static final  int kNumLowLenBits = 3;
     81 	public static final  int kNumMidLenBits = 3;
     82 	public static final  int kNumHighLenBits = 8;
     83 	public static final  int kNumLowLenSymbols = 1 << kNumLowLenBits;
     84 	public static final  int kNumMidLenSymbols = 1 << kNumMidLenBits;
     85 	public static final  int kNumLenSymbols = kNumLowLenSymbols + kNumMidLenSymbols +
     86 			(1 << kNumHighLenBits);
     87 	public static final  int kMatchMaxLen = kMatchMinLen + kNumLenSymbols - 1;
     88 }
     89