101 lines
4.2 KiB
Java
101 lines
4.2 KiB
Java
/*
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Copyright 2022 Dmitry Isaenko
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This file is part of Tihwin.
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Tihwin 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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Tihwin 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 Tihwin. If not, see <https://www.gnu.org/licenses/>.
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*/
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package tihwin.cd;
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import java.io.File;
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import java.io.RandomAccessFile;
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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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import java.util.ResourceBundle;
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public class ISO9660 {
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private final RandomAccessFile randomAccessFile;
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private final ResourceBundle resourceBundle;
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private DirectoryEntry rootEntry;
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private String title;
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public ISO9660(File iso) throws Exception {
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this.randomAccessFile = new RandomAccessFile(iso, "r");
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this.resourceBundle = ResourceBundle.getBundle("locale");
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skipFirst16Sectors();
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getRootDirectoryDescriptor();
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getSystemCnfContent(rootEntry);
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}
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private void skipFirst16Sectors() throws Exception{
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randomAccessFile.seek(2048*16);
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}
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private void getRootDirectoryDescriptor() throws Exception{
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byte[] firstPayloadDescriptor = new byte[2048];
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if (2048 != randomAccessFile.read(firstPayloadDescriptor))
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throw new Exception(resourceBundle.getString("ISO_CantReadISOInitialDescriptorText"));
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byte type = firstPayloadDescriptor[0];
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String identifier = new String(firstPayloadDescriptor, 0x1, 0x5, StandardCharsets.US_ASCII);
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byte version = firstPayloadDescriptor[0x6];
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// Let's perform some basic validations
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if (type != 1)
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throw new Exception(resourceBundle.getString("ISO_NotSupportedCdDvd")+" Type "+ type);
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if (! identifier.contentEquals("CD001"))
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throw new Exception(resourceBundle.getString("ISO_NotSupportedCdDvd")+" Identifier "+ identifier);
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if (version != 1)
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throw new Exception(resourceBundle.getString("ISO_NotSupportedCdDvd")+" Version "+ version);
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this.rootEntry = new DirectoryEntry(Arrays.copyOfRange(firstPayloadDescriptor, 0x9c, 0xbe));
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}
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private void getSystemCnfContent(DirectoryEntry entry) throws Exception{
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randomAccessFile.seek(entry.getExtentLocation() * 2048L);
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byte[] bytes = new byte[entry.getDataSize()];
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if (entry.getDataSize() != randomAccessFile.read(bytes))
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throw new Exception(resourceBundle.getString("ISO_CantReadRootDescriptor"));
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int entryOffset = 0;
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while (entryOffset < entry.getDataSize()){
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int entryLength = Byte.toUnsignedInt(bytes[entryOffset]);
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if (entryLength == 0)
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break;
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byte[] entryBytes = Arrays.copyOfRange(bytes, entryOffset, entryOffset+entryLength);
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DirectoryEntry entryIn = new DirectoryEntry(entryBytes);
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entryOffset += entryLength;
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if (entryIn.getIdentifier().toUpperCase().contains("SYSTEM.CNF")){
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randomAccessFile.seek(entryIn.getExtentLocation() * 2048L);
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byte[] configurationData = new byte[entryIn.getDataSize()];
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randomAccessFile.read(configurationData);
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String systemCnf = new String(configurationData, StandardCharsets.UTF_8);
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getTitleFromSystemCnf(systemCnf);
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return;
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}
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}
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throw new Exception(resourceBundle.getString("ISO_NoSystemCnf"));
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}
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private void getTitleFromSystemCnf(String systemCnf) throws Exception{
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String systemCnfOneLine = systemCnf.replace("\n", "").replace("\r", "");
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title = systemCnfOneLine.replaceAll("(.*cdrom0:\\\\)|(;.*)","");
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if (title.length() == 0)
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throw new Exception(resourceBundle.getString("ISO_PublisherTitleNotFound")+" "+systemCnf);
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}
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public String getTitle() { return title; }
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}
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