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• FileEntry.java

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

/*
 * 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.Checksum;

public class FileEntry {

    public Tag DescriptorTag;                    // struct tag
    public IcbTag ICBTag;                            // struct icbtag
    public long Uid;                            // Uint32
    public long Gid;                            // Uint32
    public long Permissions;                    // Uint32
    public int FileLinkCount;                    // Uint16
    public short RecordFormat;                    // Uint8
    public short RecordDisplayAttributes;        // Uint8
    public long RecordLength;                    // Uint32
    public long InformationLength;                // Uint64 !
    public long LogicalBlocksRecorded;            // Uint64 !
    public Timestamp AccessTime;                        // struct timestamp
    public Timestamp ModificationTime;                // struct timestamp
    public Timestamp AttributeTime;                    // struct timestamp
    public long Checkpoint;                        // Uint32
    public Long_ad ExtendedAttributeICB;            // struct long_ad
    public EntityID ImplementationIdentifier;        // struct EntityID
    public long UniqueID;                        // Uint64 !
    public long LengthofExtendedAttributes;        // Uint32
    public long LengthofAllocationDescriptors;    // Uint32
    public byte ExtendedAttributes[];            // byte[]
    public byte AllocationDescriptors[];        // byte[]

    public static int fixedPartLength = 176;

    public FileEntry() {
        DescriptorTag = new Tag();
        DescriptorTag.TagIdentifier = 261;

        ICBTag = new IcbTag();
        AccessTime = new Timestamp();
        ModificationTime = new Timestamp();
        AttributeTime = new Timestamp();

        ExtendedAttributeICB = new Long_ad();
        ImplementationIdentifier = new EntityID();

        ExtendedAttributes = new byte[0];
        AllocationDescriptors = new byte[0];
    }

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

        ICBTag = new IcbTag();
        ICBTag.read(myRandomAccessFile);

        Uid = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        Gid = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        Permissions = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        FileLinkCount = BinaryTools.readUInt16AsInt(myRandomAccessFile);
        RecordFormat = (short) myRandomAccessFile.readUnsignedByte();
        RecordDisplayAttributes = (short) myRandomAccessFile.readUnsignedByte();
        RecordLength = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        InformationLength = BinaryTools.readUInt64AsLong(myRandomAccessFile);
        LogicalBlocksRecorded = BinaryTools.readUInt64AsLong(myRandomAccessFile);

        AccessTime = new Timestamp();
        AccessTime.read(myRandomAccessFile);

        ModificationTime = new Timestamp();
        ModificationTime.read(myRandomAccessFile);

        AttributeTime = new Timestamp();
        AttributeTime.read(myRandomAccessFile);

        Checkpoint = BinaryTools.readUInt32AsLong(myRandomAccessFile);

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

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

        UniqueID = BinaryTools.readUInt64AsLong(myRandomAccessFile);

        LengthofExtendedAttributes = BinaryTools.readUInt32AsLong(myRandomAccessFile);
        LengthofAllocationDescriptors = BinaryTools.readUInt32AsLong(myRandomAccessFile);

        ExtendedAttributes = new byte[(int) LengthofExtendedAttributes];
        myRandomAccessFile.read(ExtendedAttributes);

        AllocationDescriptors = new byte[(int) LengthofAllocationDescriptors];
        myRandomAccessFile.read(AllocationDescriptors);
    }

    public void write(RandomAccessFile myRandomAccessFile, int blockSize)
            throws IOException {
        byte rawBytes[] = getBytesWithoutDescriptorTag();

        DescriptorTag.DescriptorCRCLength = rawBytes.length;
        DescriptorTag.DescriptorCRC = Checksum.cksum(rawBytes);

        DescriptorTag.write(myRandomAccessFile);

        myRandomAccessFile.write(rawBytes);

        int bytesWritten = rawBytes.length + 16;

        byte emptyBytesInBlock[] = new byte[blockSize - bytesWritten];
        myRandomAccessFile.write(emptyBytesInBlock);
    }

    public byte[] getBytesWithoutDescriptorTag() {
        byte ICBTagBytes[] = ICBTag.getBytes();
        byte AccessTimeBytes[] = AccessTime.getBytes();
        byte ModificationTimeBytes[] = ModificationTime.getBytes();
        byte AttributeTimeBytes[] = AttributeTime.getBytes();
        byte ExtendedAttributeICBBytes[] = ExtendedAttributeICB.getBytes();
        byte ImplementationIdentifierBytes[] = ImplementationIdentifier.getBytes();

        byte rawBytes[] = new byte[56
                + ICBTagBytes.length
                + AccessTimeBytes.length
                + ModificationTimeBytes.length
                + AttributeTimeBytes.length
                + ExtendedAttributeICBBytes.length
                + ImplementationIdentifierBytes.length
                + ExtendedAttributes.length
                + AllocationDescriptors.length];

        int pos = 0;

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

        pos = BinaryTools.getUInt32BytesFromLong(Uid, rawBytes, pos);
        pos = BinaryTools.getUInt32BytesFromLong(Gid, rawBytes, pos);
        pos = BinaryTools.getUInt32BytesFromLong(Permissions, rawBytes, pos);
        pos = BinaryTools.getUInt16BytesFromInt(FileLinkCount, rawBytes, pos);

        rawBytes[pos++] = (byte) (RecordFormat & 0xFF);
        rawBytes[pos++] = (byte) (RecordDisplayAttributes & 0xFF);

        pos = BinaryTools.getUInt32BytesFromLong(RecordLength, rawBytes, pos);
        pos = BinaryTools.getUInt64BytesFromLong(InformationLength, rawBytes, pos);
        pos = BinaryTools.getUInt64BytesFromLong(LogicalBlocksRecorded, rawBytes, pos);

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

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

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

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

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

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

        pos = BinaryTools.getUInt64BytesFromLong(UniqueID, rawBytes, pos);
        pos = BinaryTools.getUInt32BytesFromLong(LengthofExtendedAttributes, rawBytes, pos);
        pos = BinaryTools.getUInt32BytesFromLong(LengthofAllocationDescriptors, rawBytes, pos);

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

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

        return rawBytes;
    }

    public byte[] getBytes(int blockSize) {
        byte bytesWithoutDescriptorTag[] = getBytesWithoutDescriptorTag();

        DescriptorTag.DescriptorCRCLength = bytesWithoutDescriptorTag.length;
        DescriptorTag.DescriptorCRC = Checksum.cksum(bytesWithoutDescriptorTag);

        byte descriptorTagBytes[] = DescriptorTag.getBytes();

        int paddedLength = descriptorTagBytes.length + bytesWithoutDescriptorTag.length;
        if (paddedLength % blockSize != 0) {
            paddedLength += blockSize - (paddedLength % blockSize);
        }

        byte[] rawBytes = new byte[paddedLength];

        int pos = 0;

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

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

        return rawBytes;
    }

}