186 lines
10 KiB
Java
186 lines
10 KiB
Java
/*
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Copyright 2022 Dmitry Isaenko
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This file is part of ISEE9660.
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ISEE9660 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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ISEE9660 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 ISEE9660. If not, see <https://www.gnu.org/licenses/>.
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*/
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package isee9660.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 static isee9660.DataFormatConverter.*;
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public class ISO9660 {
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private final RandomAccessFile randomAccessFile;
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private byte type;
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private String identifier;
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private byte version;
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//unused1;
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private String systemIdentifier;
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private String volumeIdentifier;
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//unused2;
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private long volumeSpaceSize;
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//unused3;
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private short volumeSetSize;
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private short volumeSequenceNumber;
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private short logicalBlockSize;
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private int pathTableSize;
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private int locationOfType_LPathTable;
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private int locationOfOptionalType_LPathTable;
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private int locationOfType_MPathTable;
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private int locationOfOptionalType_MPathTable;
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private DirectoryEntry rootEntry;
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private String volumeSetIdentifier;
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private String publisherIdentifier;
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private String dataPreparerIdentifier;
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private String applicationIdentifier;
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private String CopyrightFileIdentifier;
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private String abstractFileIdentifier;
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private String bibliographicFileIdentifier;
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private String volumeCreationDateTime;
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private String volumeModificationDateTime;
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private String volumeExpirationDateTime;
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private String volumeEffectiveDateTime;
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private byte fileStructureStandardVersion;
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//unused4;
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//applicationUse;
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//reserved;
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private PathTableLE pathTableLE;
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public ISO9660(String path) throws Exception {
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this(new File(path));
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}
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public ISO9660(File iso) throws Exception {
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this.randomAccessFile = new RandomAccessFile(iso, "r");
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skipFirst16Sectors();
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readInitialDescriptor();
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readPathTableLE();
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printDebug();
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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 readInitialDescriptor() 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("Can't read first descriptor at offset of 0x10");
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this.type = firstPayloadDescriptor[0];
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this.identifier = new String(firstPayloadDescriptor, 0x1, 0x5, StandardCharsets.US_ASCII);
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this.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("Not supported ISO Type of "+type);
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if (! identifier.contentEquals("CD001"))
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throw new Exception("Not supported ISO Identifier of "+identifier);
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if (version != 1)
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throw new Exception("Not supported ISO Version of "+version);
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this.systemIdentifier = new String(firstPayloadDescriptor, 0x8, 0x20, StandardCharsets.US_ASCII);
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this.volumeIdentifier = new String(firstPayloadDescriptor, 0x28, 0x20, StandardCharsets.US_ASCII);;
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this.volumeSpaceSize = getLEint(firstPayloadDescriptor, 0x50); // Both-endian; 4 bit palindrome ; amount of data available on the CD-ROM
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this.volumeSetSize = getLEshort(firstPayloadDescriptor, 0x78);
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this.volumeSequenceNumber = getLEshort(firstPayloadDescriptor, 0x7c);
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this.logicalBlockSize = getLEshort(firstPayloadDescriptor, 0x80);
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this.pathTableSize = getLEint(firstPayloadDescriptor, 0x84);
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this.locationOfType_LPathTable = getLEint(firstPayloadDescriptor, 0x8c); // LE
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this.locationOfOptionalType_LPathTable = getLEint(firstPayloadDescriptor, 0x90); //LE
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this.locationOfType_MPathTable = getBEint(firstPayloadDescriptor, 0x94); //BE
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this.locationOfOptionalType_MPathTable = getBEint(firstPayloadDescriptor, 0x98); //BE
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this.rootEntry = new DirectoryEntry(Arrays.copyOfRange(firstPayloadDescriptor, 0x9c, 0xbe));
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this.volumeSetIdentifier = new String(firstPayloadDescriptor, 0xbe, 0x80, StandardCharsets.US_ASCII);
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this.publisherIdentifier = new String(firstPayloadDescriptor, 0x13e, 0x80, StandardCharsets.US_ASCII);
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this.dataPreparerIdentifier = new String(firstPayloadDescriptor, 0x1be, 0x80, StandardCharsets.US_ASCII);
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this.applicationIdentifier = new String(firstPayloadDescriptor, 0x23e, 0x80, StandardCharsets.US_ASCII);
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this.CopyrightFileIdentifier = new String(firstPayloadDescriptor, 0x2be, 0x25, StandardCharsets.US_ASCII);
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this.abstractFileIdentifier = new String(firstPayloadDescriptor, 0x2e3, 0x25, StandardCharsets.US_ASCII);
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this.bibliographicFileIdentifier = new String(firstPayloadDescriptor, 0x308, 0x25, StandardCharsets.US_ASCII);
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this.volumeCreationDateTime = DateTime.getPrimaryVolumeDescriptorDateTime(Arrays.copyOfRange(firstPayloadDescriptor, 813, 830)).toString();
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this.volumeModificationDateTime = DateTime.getPrimaryVolumeDescriptorDateTime(Arrays.copyOfRange(firstPayloadDescriptor, 830, 847)).toString();
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this.volumeExpirationDateTime = DateTime.getPrimaryVolumeDescriptorDateTime(Arrays.copyOfRange(firstPayloadDescriptor, 847, 864)).toString();
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this.volumeEffectiveDateTime = DateTime.getPrimaryVolumeDescriptorDateTime(Arrays.copyOfRange(firstPayloadDescriptor, 864, 881)).toString();
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this.fileStructureStandardVersion = firstPayloadDescriptor[0x371];
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}
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private void readPathTableLE() throws Exception{
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randomAccessFile.seek(2048L * locationOfType_LPathTable);
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byte[] pathTableBytes = new byte[pathTableSize];
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if (pathTableSize != randomAccessFile.read(pathTableBytes))
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throw new Exception("Can't read Path Table");
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pathTableLE = new PathTableLE(pathTableBytes);
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}
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private void getRootEntryFiles(DirectoryEntry entry) throws Exception{
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//entry.printDebug();
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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("Can't look inside Root folder");
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int entryOffset = 0;
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while (entryOffset < entry.getDataSize()){
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byte entryLength = 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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entryIn.printDebug();
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entryOffset += entryLength;
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}
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}
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private void printDebug() throws Exception{
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System.out.println(
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"Type: "+type + "\n" +
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"Identifier: "+identifier + "\n" +
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"Version: "+version + "\n" +
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"System Identifier " + systemIdentifier + "\n" +
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"Volume Identifier " + volumeIdentifier + "\n" +
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"Volume Space Size " + volumeSpaceSize + "\n" +
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"Volume Set Size " + volumeSetSize + "\n" +
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"Volume Sequence Number " + volumeSequenceNumber + "\n" +
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"Logical Block Size " + logicalBlockSize + "\n" +
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"Path Table Size " + pathTableSize + "\n" +
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"Location of Type-L Path Table " + locationOfType_LPathTable + "\n" +
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"Location of the Optional Type-L Path Table " + locationOfOptionalType_LPathTable + "\n" +
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"Location of Type-M Path Table " + locationOfType_MPathTable + "\n" +
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"Location of Optional Type-M Path Table " + locationOfOptionalType_MPathTable);
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rootEntry.printDebug();
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System.out.println(
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"Volume Set Identifier " + volumeSetIdentifier + "\n" +
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"Publisher Identifier " + publisherIdentifier + "\n" +
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"Data Preparer Identifier " + dataPreparerIdentifier + "\n" +
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"Application Identifier " + applicationIdentifier + "\n" +
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"Copyright File Identifier " + CopyrightFileIdentifier + "\n" +
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"Abstract File Identifier " + abstractFileIdentifier + "\n" +
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"Bibliographic File Identifier " + bibliographicFileIdentifier + "\n" +
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"Volume Creation Date and Time " + volumeCreationDateTime + "\n" +
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"Volume Modification Date and Time " + volumeModificationDateTime + "\n" +
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"Volume Expiration Date and Time " + volumeExpirationDateTime + "\n" +
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"Volume Effective Date and Time " + volumeEffectiveDateTime + "\n" +
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"File Structure Version " + fileStructureStandardVersion +
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"\n--------------------------------------------------------------------------------");
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pathTableLE.printDebug();
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System.out.println("= Files and directories @ root =");
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getRootEntryFiles(rootEntry);
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}
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}
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