110 lines
3.8 KiB
Java
110 lines
3.8 KiB
Java
/*
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Copyright 2018-2022 Dmitry Isaenko
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This file is part of NS-USBloader.
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NS-USBloader is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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NS-USBloader is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with NS-USBloader. If not, see <https://www.gnu.org/licenses/>.
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*/
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package nsusbloader.Utilities.patches.es.finders;
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import libKonogonka.Converter;
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import nsusbloader.Utilities.patches.es.BinToAsmPrinter;
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import nsusbloader.Utilities.patches.es.SimplyFind;
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import java.util.List;
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class HeuristicEs1 implements IHeuristicEs {
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private static final String PATTERN = "1F90013128.8052";
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private final List<Integer> findings;
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private final byte[] where;
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HeuristicEs1(byte[] where){
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this.where = where;
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SimplyFind simplyfind = new SimplyFind(PATTERN, where);
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this.findings = simplyfind.getResults();
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this.findings.removeIf(this::dropStep1);
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if(findings.size() < 2)
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return;
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this.findings.removeIf(this::dropStep2);
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}
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// Check ranges
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private boolean dropStep1(int offsetOfPatternFound){
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return ((offsetOfPatternFound < 0x10000 || offsetOfPatternFound > 0xffffc));
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}
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// Remove non-CBZ
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private boolean dropStep2(int offsetOfPatternFound){
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return ((where[offsetOfPatternFound - 1] & (byte) 0b01111111) != 0x34);
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}
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@Override
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public boolean isFound(){
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return findings.size() == 1;
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}
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@Override
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public boolean wantLessEntropy(){
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return findings.size() > 1;
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}
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@Override
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public int getOffset() throws Exception{
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if(findings.isEmpty())
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throw new Exception("Nothing found");
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if (findings.size() > 1)
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throw new Exception("Too many offsets");
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return findings.get(0);
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}
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@Override
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public boolean setOffsetsNearby(int offsetNearby) {
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findings.removeIf(offset -> {
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if (offset > offsetNearby)
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return ! (offset < offsetNearby - 0xffff);
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return ! (offset > offsetNearby - 0xffff);
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});
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return isFound();
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}
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@Override
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public String getDetails(){
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StringBuilder builder = new StringBuilder();
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int cbzOffsetInternal = findings.get(0) - 4;
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int instructionExpression = Converter.getLEint(where, cbzOffsetInternal);
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int conditionalJumpLocation = ((instructionExpression >> 5 & 0x7FFFF) * 4 + cbzOffsetInternal) & 0xfffff;
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int secondExpressionsPairElement1 = Converter.getLEint(where, conditionalJumpLocation);
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int secondExpressionsPairElement2 = Converter.getLEint(where, conditionalJumpLocation+4);
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builder.append(BinToAsmPrinter.printSimplified(instructionExpression, cbzOffsetInternal));
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builder.append(BinToAsmPrinter.printSimplified(Converter.getLEint(where, cbzOffsetInternal+4),
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cbzOffsetInternal+4));
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builder.append(BinToAsmPrinter.printSimplified(Converter.getLEint(where, cbzOffsetInternal+8),
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cbzOffsetInternal+8));
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builder.append("...\n");
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builder.append(BinToAsmPrinter.printSimplified(secondExpressionsPairElement1, conditionalJumpLocation));
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builder.append(BinToAsmPrinter.printSimplified(secondExpressionsPairElement2, conditionalJumpLocation+4));
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return builder.toString();
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}
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@Override
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public int getId(){
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return 1;
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}
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}
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