com.github.stephenc.javaisotools.udflib.structures.LVInformation 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.OSTAUnicode;

public class LVInformation {

    public CharSpec LVICharset;                        // struct charspec
    public byte LogicalVolumeIdentifier[];        // dstring[128]
    public byte LVInfo1[];                        // dstring[36]
    public byte LVInfo2[];                        // dstring[36]
    public byte LVInfo3[];                        // dstring[36]
    public EntityID ImplementationID;                // struct EntityID
    public byte ImplementationUse[];            // byte[128];

    public LVInformation() {
        LVICharset = new CharSpec();
        LogicalVolumeIdentifier = new byte[128];
        LVInfo1 = new byte[36];
        LVInfo2 = new byte[36];
        LVInfo3 = new byte[36];
        ImplementationID = new EntityID();
        ImplementationUse = new byte[128];
    }

    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 setLVInfo1(String lvInfo)
            throws Exception {
        if (lvInfo.length() > 34) {
            throw new Exception("error: lvInfo length > 34 characters");
        }

        LVInfo1 = new byte[36];

        try {
            byte lvInfoBytes[] = lvInfo.getBytes("UTF-16");

            int compId = OSTAUnicode.getBestCompressionId(lvInfoBytes);

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

            int length = (tmpIdentifier.length < 35) ? tmpIdentifier.length : 35;

            System.arraycopy(tmpIdentifier, 0, LVInfo1, 0, length);

            LogicalVolumeIdentifier[LVInfo1.length - 1] = (byte) length;
        }
        catch (Exception ex) { /* never happens */ }
    }

    public void setLVInfo2(String lvInfo)
            throws Exception {
        if (lvInfo.length() > 34) {
            throw new Exception("error: lvInfo length > 34 characters");
        }

        LVInfo2 = new byte[36];

        try {
            byte lvInfoBytes[] = lvInfo.getBytes("UTF-16");

            int compId = OSTAUnicode.getBestCompressionId(lvInfoBytes);

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

            int length = (tmpIdentifier.length < 35) ? tmpIdentifier.length : 35;

            System.arraycopy(tmpIdentifier, 0, LVInfo2, 0, length);

            LogicalVolumeIdentifier[LVInfo2.length - 1] = (byte) length;
        }
        catch (Exception ex) { /* never happens */ }
    }

    public void setLVInfo3(String lvInfo)
            throws Exception {
        if (lvInfo.length() > 34) {
            throw new Exception("error: lvInfo length > 34 characters");
        }

        LVInfo3 = new byte[36];

        try {
            byte lvInfoBytes[] = lvInfo.getBytes("UTF-16");

            int compId = OSTAUnicode.getBestCompressionId(lvInfoBytes);

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

            int length = (tmpIdentifier.length < 35) ? tmpIdentifier.length : 35;

            System.arraycopy(tmpIdentifier, 0, LVInfo3, 0, length);

            LogicalVolumeIdentifier[LVInfo3.length - 1] = (byte) length;
        }
        catch (Exception ex) { /* never happens */ }
    }

    public void read(RandomAccessFile myRandomAccessFile)
            throws IOException {
        LVICharset = new CharSpec();
        LVICharset.read(myRandomAccessFile);

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

        LVInfo1 = new byte[36];
        myRandomAccessFile.read(LVInfo1);

        LVInfo2 = new byte[36];
        myRandomAccessFile.read(LVInfo2);

        LVInfo3 = new byte[36];
        myRandomAccessFile.read(LVInfo3);

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

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

    public byte[] getBytes() {
        byte LVICharsetBytes[] = LVICharset.getBytes();
        byte ImplementationIDBytes[] = ImplementationID.getBytes();

        byte rawBytes[] = new byte[364
                + LVICharsetBytes.length
                + ImplementationIDBytes.length];

        int pos = 0;

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

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

        System.arraycopy(LVInfo1, 0, rawBytes, pos, LVInfo1.length);
        pos += LVInfo1.length;

        System.arraycopy(LVInfo2, 0, rawBytes, pos, LVInfo2.length);
        pos += LVInfo2.length;

        System.arraycopy(LVInfo3, 0, rawBytes, pos, LVInfo3.length);
        pos += LVInfo3.length;

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

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

        return rawBytes;
    }
}