com.github.stephenc.javaisotools.udflib.structures.LogicalVolumeDescriptor Maven / Gradle / Ivy

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/*
 * Copyright (c) 2010. Stephen Connolly.
 * Copyright (c) 2006. Björn Stickler .
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.github.stephenc.javaisotools.udflib.structures;

import java.io.IOException;
import java.io.RandomAccessFile;

import com.github.stephenc.javaisotools.udflib.tools.BinaryTools;
import com.github.stephenc.javaisotools.udflib.tools.OSTAUnicode;

public class LogicalVolumeDescriptor extends VolumeDescriptorSequenceItem {

    public CharSpec DescriptorCharacterSet;            // struct charspec
    public byte LogicalVolumeIdentifier[];        // dstring[128]
    public long LogicalBlockSize;                // Uint32
    public EntityID DomainIdentifier;                // struct EntityID

    //public byte		LogicalVolumeContentsUse[];		// dstring[16]
    public Long_ad LogicalVolumeContentsUse;

    public long MapTableLength;                    // Uint32
    public long NumberofPartitionMaps;            // Uint32
    public EntityID ImplementationIdentifier;        // struct EntityID
    public byte ImplementationUse[];            // byte[128]
    public Extend_ad IntegritySequenceExtent;        // extend_ad
    public byte PartitionMaps[];                // byte[]

    public LogicalVolumeDescriptor() {
        DescriptorTag = new Tag();
        DescriptorTag.TagIdentifier = 6;

        DescriptorCharacterSet = new CharSpec();
        LogicalVolumeIdentifier = new byte[128];
        DomainIdentifier = new EntityID();
        LogicalVolumeContentsUse = new Long_ad();
        ImplementationIdentifier = new EntityID();
        ImplementationUse = new byte[128];
        IntegritySequenceExtent = new Extend_ad();
        PartitionMaps = new byte[0];
    }

    public void setLogicalVolumeIdentifier(String volumeIdentifier)
            throws Exception {
        if (volumeIdentifier.length() > 126) {
            throw new Exception("error: logical volume identifier length > 126 characters");
        }

        LogicalVolumeIdentifier = new byte[128];

        try {
            byte volumeIdentifierBytes[] = volumeIdentifier.getBytes("UTF-16");

            int compId = OSTAUnicode.getBestCompressionId(volumeIdentifierBytes);

            byte tmpIdentifier[] = OSTAUnicode.CompressUnicodeByte(volumeIdentifierBytes, compId);

            int length = (tmpIdentifier.length < 127) ? tmpIdentifier.length : 127;

            System.arraycopy(tmpIdentifier, 0, LogicalVolumeIdentifier, 0, length);

            LogicalVolumeIdentifier[LogicalVolumeIdentifier.length - 1] = (byte) length;
        }
        catch (Exception ex) { /* never happens */ }
    }

    public void read(RandomAccessFile myRandomAccessFile)
            throws IOException {
        DescriptorTag = new Tag();
        DescriptorTag.read(myRandomAccessFile);

        VolumeDescriptorSequenceNumber = BinaryTools.readUInt32AsLong(myRandomAccessFile);

        DescriptorCharacterSet = new CharSpec();
        DescriptorCharacterSet.read(myRandomAccessFile);

        LogicalVolumeIdentifier = new byte[128];
        myRandomAccessFile.read(LogicalVolumeIdentifier);

        LogicalBlockSize = BinaryTools.readUInt32AsLong(myRandomAccessFile);

        DomainIdentifier = new EntityID();
        DomainIdentifier.read(myRandomAccessFile);

        //LogicalVolumeContentsUse = new byte[16];
        //myRandomAccessFile.read( LogicalVolumeContentsUse );

        LogicalVolumeContentsUse = new Long_ad();
        LogicalVolumeContentsUse.read(myRandomAccessFile);

        MapTableLength = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        NumberofPartitionMaps = BinaryTools.readUInt32AsLong(myRandomAccessFile);

        ImplementationIdentifier = new EntityID();
        ImplementationIdentifier.read(myRandomAccessFile);

        ImplementationUse = new byte[128];
        myRandomAccessFile.read(ImplementationUse);

        IntegritySequenceExtent = new Extend_ad();
        IntegritySequenceExtent.read(myRandomAccessFile);

        PartitionMaps = new byte[(int) MapTableLength];
        myRandomAccessFile.read(PartitionMaps);
    }

    public byte[] getBytesWithoutDescriptorTag() {
        byte DescriptorCharacterSetBytes[] = DescriptorCharacterSet.getBytes();
        byte DomainIdentifierBytes[] = DomainIdentifier.getBytes();
        byte LogicalVolumeContentsUseBytes[] = LogicalVolumeContentsUse.getBytes();
        byte ImplementationIdentifierBytes[] = ImplementationIdentifier.getBytes();
        byte IntegritySequenceExtentBytes[] = IntegritySequenceExtent.getBytes();

        byte rawBytes[] = new byte[272
                + DescriptorCharacterSetBytes.length
                + DomainIdentifierBytes.length
                + LogicalVolumeContentsUseBytes.length
                + ImplementationIdentifierBytes.length
                + IntegritySequenceExtentBytes.length
                + PartitionMaps.length];

        int pos = 0;

        pos = BinaryTools.getUInt32BytesFromLong(VolumeDescriptorSequenceNumber, rawBytes, pos);

        System.arraycopy(DescriptorCharacterSetBytes, 0, rawBytes, pos, DescriptorCharacterSetBytes.length);
        pos += DescriptorCharacterSetBytes.length;

        System.arraycopy(LogicalVolumeIdentifier, 0, rawBytes, pos, LogicalVolumeIdentifier.length);
        pos += LogicalVolumeIdentifier.length;

        pos = BinaryTools.getUInt32BytesFromLong(LogicalBlockSize, rawBytes, pos);

        System.arraycopy(DomainIdentifierBytes, 0, rawBytes, pos, DomainIdentifierBytes.length);
        pos += DomainIdentifierBytes.length;

        System.arraycopy(LogicalVolumeContentsUseBytes, 0, rawBytes, pos, LogicalVolumeContentsUseBytes.length);
        pos += LogicalVolumeContentsUseBytes.length;

        pos = BinaryTools.getUInt32BytesFromLong(MapTableLength, rawBytes, pos);
        pos = BinaryTools.getUInt32BytesFromLong(NumberofPartitionMaps, rawBytes, pos);

        System.arraycopy(ImplementationIdentifierBytes, 0, rawBytes, pos, ImplementationIdentifierBytes.length);
        pos += ImplementationIdentifierBytes.length;

        System.arraycopy(ImplementationUse, 0, rawBytes, pos, ImplementationUse.length);
        pos += ImplementationUse.length;

        System.arraycopy(IntegritySequenceExtentBytes, 0, rawBytes, pos, IntegritySequenceExtentBytes.length);
        pos += IntegritySequenceExtentBytes.length;

        System.arraycopy(PartitionMaps, 0, rawBytes, pos, PartitionMaps.length);
        pos += PartitionMaps.length;

        return rawBytes;
    }
}