| 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 | }
|
|---|
