mirror of
https://git.huckle.dev/Huckles-Minecraft-Archive/jpexs-decompiler.git
synced 2026-05-28 10:46:08 +00:00
Separated FFDec core library and the rest (GUI).
FFDec Library is now LGPLv3, others stay GPLv3. Version changed to 3.0.0 for FFDec, 1.0.0 for FFDec Library.
This commit is contained in:
103
libsrc/ffdec_lib/src/com/jpexs/helpers/StreamSearch.java
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103
libsrc/ffdec_lib/src/com/jpexs/helpers/StreamSearch.java
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/*
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* Copyright (C) 2014 JPEXS, All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3.0 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library.
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*/
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package com.jpexs.helpers;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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*
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* @author JPEXS
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*/
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public class StreamSearch implements Searchable {
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private final MemoryInputStream is;
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public StreamSearch(InputStream is) throws IOException {
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this.is = new MemoryInputStream(Helper.readStream(is));
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}
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@Override
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public Map<Long, InputStream> search(byte[]
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... data) {
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return search(null, data);
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}
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@Override
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public Map<Long, InputStream> search(ProgressListener progListener, byte[]
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... data) {
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Map<Long, InputStream> ret = new HashMap<>();
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int maxFindLen = 0;
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for (int i = 0; i < data.length; i++) {
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if (data[i].length > maxFindLen) {
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maxFindLen = data[i].length;
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}
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}
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try {
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is.seek(0);
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byte[] buf = new byte[4096];
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byte[] last = null;
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int cnt = 0;
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long pos = 0;
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while ((cnt = is.read(buf)) > 0) {
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for (int i = -maxFindLen + 1; i < cnt; i++) {
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loopdata:
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for (byte[] onedata : data) {
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boolean match = true;
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for (int d = 0; d < onedata.length; d++) {
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byte b;
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if (i + d < 0) {
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if (last != null) {
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b = last[last.length + i + d];
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} else {
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continue;
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}
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} else if (i + d >= buf.length) {
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continue;
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} else {
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b = buf[i + d];
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}
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if (b != onedata[d]) {
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match = false;
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break;
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}
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}
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if (match) {
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// todo: support > 2GB files
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InputStream fis = new MemoryInputStream(is.getAllRead(), (int) pos + i);
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ret.put(pos + i, fis);
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continue loopdata;
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}
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}
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}
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pos = pos + cnt;
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}
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} catch (IOException ex) {
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Logger.getLogger(StreamSearch.class.getName()).log(Level.SEVERE, null, ex);
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}
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return ret;
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}
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