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/*
 * Copyright (c) 2010. Stephen Connolly.
 * Copyright (c) 2006-2007. loopy project (http://loopy.sourceforge.net).
 *  
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.github.stephenc.javaisotools.loopfs.iso9660;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

import com.github.stephenc.javaisotools.loopfs.spi.AbstractBlockFileSystem;
import com.github.stephenc.javaisotools.loopfs.spi.SeekableInput;
import com.github.stephenc.javaisotools.loopfs.spi.SeekableInputFile;
import com.github.stephenc.javaisotools.loopfs.spi.VolumeDescriptorSet;

public class Iso9660FileSystem extends AbstractBlockFileSystem {

    public Iso9660FileSystem(File file, boolean readOnly) throws IOException {
        this(new SeekableInputFile(file), readOnly);
    }

    public Iso9660FileSystem(SeekableInput seekable, boolean readOnly) throws IOException {
        super(seekable, readOnly, Constants.DEFAULT_BLOCK_SIZE, Constants.RESERVED_SECTORS);
    }

    public String getEncoding() {
        return ((Iso9660VolumeDescriptorSet) getVolumeDescriptorSet()).getEncoding();
    }

    public InputStream getInputStream(Iso9660FileEntry entry) {
        ensureOpen();
        return new EntryInputStream(entry, this);
    }

    byte[] getBytes(Iso9660FileEntry entry) throws IOException {
        if (entry.getSize() > Integer.MAX_VALUE) {
            throw new IOException("Entry too large");
        }
        int size = (int) entry.getSize();

        byte[] buf = new byte[size];

        readBytes(entry, 0, buf, 0, size);

        return buf;
    }

    int readBytes(Iso9660FileEntry entry, long entryOffset, byte[] buffer, int bufferOffset, int len)
            throws IOException {
        long startPos = (entry.getStartBlock() * Constants.DEFAULT_BLOCK_SIZE) + entryOffset;
        return readData(startPos, buffer, bufferOffset, len);
    }

    protected Iterator iterator(Iso9660FileEntry rootEntry) {
        return new EntryIterator(this, rootEntry);
    }

    protected VolumeDescriptorSet createVolumeDescriptorSet() {
        return new Iso9660VolumeDescriptorSet(this);
    }
}