Base.java

// Base.java
package sevenzip.compression.lzma;


public class Base {

    public static final int kNumRepDistances = 4;

    public static final int kNumStates = 12;


    public static final int StateInit() {
        return 0;
    }


    public static final int StateUpdateChar(int index) {
        if (index<4) {
            return 0;
        }
        if (index<10) {
            return index-3;
        }
        return index-6;
    }


    public static final int StateUpdateMatch(int index) {
        return (index<7 ? 7 : 10);
    }


    public static final int StateUpdateRep(int index) {
        return (index<7 ? 8 : 11);
    }


    public static final int StateUpdateShortRep(int index) {
        return (index<7 ? 9 : 11);
    }


    public static final boolean StateIsCharState(int index) {
        return index<7;
    }

    public static final int kNumPosSlotBits = 6;

    public static final int kDicLogSizeMin = 0;
	// public static final int kDicLogSizeMax = 28;
    // public static final int kDistTableSizeMax = kDicLogSizeMax * 2;

    public static final int kNumLenToPosStatesBits = 2; // it's for speed optimization

    public static final int kNumLenToPosStates = 1<<kNumLenToPosStatesBits;

    public static final int kMatchMinLen = 2;


    public static final int GetLenToPosState(int len) {
        len -= kMatchMinLen;
        if (len<kNumLenToPosStates) {
            return len;
        }
        return (kNumLenToPosStates-1);
    }

    public static final int kNumAlignBits = 4;

    public static final int kAlignTableSize = 1<<kNumAlignBits;

    public static final int kAlignMask = (kAlignTableSize-1);

    public static final int kStartPosModelIndex = 4;

    public static final int kEndPosModelIndex = 14;

    public static final int kNumPosModels = kEndPosModelIndex-kStartPosModelIndex;

    public static final int kNumFullDistances = 1<<(kEndPosModelIndex/2);

    public static final int kNumLitPosStatesBitsEncodingMax = 4;

    public static final int kNumLitContextBitsMax = 8;

    public static final int kNumPosStatesBitsMax = 4;

    public static final int kNumPosStatesMax = (1<<kNumPosStatesBitsMax);

    public static final int kNumPosStatesBitsEncodingMax = 4;

    public static final int kNumPosStatesEncodingMax = (1<<kNumPosStatesBitsEncodingMax);

    public static final int kNumLowLenBits = 3;

    public static final int kNumMidLenBits = 3;

    public static final int kNumHighLenBits = 8;

    public static final int kNumLowLenSymbols = 1<<kNumLowLenBits;

    public static final int kNumMidLenSymbols = 1<<kNumMidLenBits;

    public static final int kNumLenSymbols = kNumLowLenSymbols+kNumMidLenSymbols
            +(1<<kNumHighLenBits);

    public static final int kMatchMaxLen = kMatchMinLen+kNumLenSymbols-1;

}