1 /* 2 * State 3 * 4 * Authors: Lasse Collin <lasse.collin (at) tukaani.org> 5 * Igor Pavlov <http://7-zip.org/> 6 * 7 * This file has been put into the public domain. 8 * You can do whatever you want with this file. 9 */ 10 11 package org.tukaani.xz.lzma; 12 13 final class State { 14 static final int STATES = 12; 15 16 private static final int LIT_STATES = 7; 17 18 private static final int LIT_LIT = 0; 19 private static final int MATCH_LIT_LIT = 1; 20 private static final int REP_LIT_LIT = 2; 21 private static final int SHORTREP_LIT_LIT = 3; 22 private static final int MATCH_LIT = 4; 23 private static final int REP_LIT = 5; 24 private static final int SHORTREP_LIT = 6; 25 private static final int LIT_MATCH = 7; 26 private static final int LIT_LONGREP = 8; 27 private static final int LIT_SHORTREP = 9; 28 private static final int NONLIT_MATCH = 10; 29 private static final int NONLIT_REP = 11; 30 31 private int state; 32 33 State() {} 34 35 State(State other) { 36 state = other.state; 37 } 38 39 void reset() { 40 state = LIT_LIT; 41 } 42 43 int get() { 44 return state; 45 } 46 47 void set(State other) { 48 state = other.state; 49 } 50 51 void updateLiteral() { 52 if (state <= SHORTREP_LIT_LIT) 53 state = LIT_LIT; 54 else if (state <= LIT_SHORTREP) 55 state -= 3; 56 else 57 state -= 6; 58 } 59 60 void updateMatch() { 61 state = state < LIT_STATES ? LIT_MATCH : NONLIT_MATCH; 62 } 63 64 void updateLongRep() { 65 state = state < LIT_STATES ? LIT_LONGREP : NONLIT_REP; 66 } 67 68 void updateShortRep() { 69 state = state < LIT_STATES ? LIT_SHORTREP : NONLIT_REP; 70 } 71 72 boolean isLiteral() { 73 return state < LIT_STATES; 74 } 75 } 76
