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1 | /*
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2 | * Optimum
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3 | *
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4 | * Authors: Lasse Collin <lasse.collin@tukaani.org>
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5 | * Igor Pavlov <http://7-zip.org/>
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6 | *
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7 | * This file has been put into the public domain.
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8 | * You can do whatever you want with this file.
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9 | */
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10 |
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11 | package org.tukaani.xz.lzma;
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12 |
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13 | final class Optimum {
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14 | private static final int INFINITY_PRICE = 1 << 30;
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15 |
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16 | final State state = new State();
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17 | final int[] reps = new int[LZMACoder.REPS];
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18 |
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19 | /**
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20 | * Cumulative price of arriving to this byte.
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21 | */
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22 | int price;
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23 |
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24 | int optPrev;
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25 | int backPrev;
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26 | boolean prev1IsLiteral;
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27 |
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28 | boolean hasPrev2;
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29 | int optPrev2;
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30 | int backPrev2;
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31 |
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32 | /**
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33 | * Resets the price.
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34 | */
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35 | void reset() {
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36 | price = INFINITY_PRICE;
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37 | }
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38 |
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39 | /**
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40 | * Sets to indicate one LZMA symbol (literal, rep, or match).
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41 | */
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42 | void set1(int newPrice, int optCur, int back) {
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43 | price = newPrice;
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44 | optPrev = optCur;
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45 | backPrev = back;
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46 | prev1IsLiteral = false;
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47 | }
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48 |
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49 | /**
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50 | * Sets to indicate two LZMA symbols of which the first one is a literal.
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51 | */
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52 | void set2(int newPrice, int optCur, int back) {
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53 | price = newPrice;
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54 | optPrev = optCur + 1;
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55 | backPrev = back;
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56 | prev1IsLiteral = true;
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57 | hasPrev2 = false;
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58 | }
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59 |
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60 | /**
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61 | * Sets to indicate three LZMA symbols of which the second one
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62 | * is a literal.
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63 | */
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64 | void set3(int newPrice, int optCur, int back2, int len2, int back) {
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65 | price = newPrice;
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66 | optPrev = optCur + len2 + 1;
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67 | backPrev = back;
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68 | prev1IsLiteral = true;
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69 | hasPrev2 = true;
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70 | optPrev2 = optCur;
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71 | backPrev2 = back2;
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72 | }
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73 | }
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