org.fox.ttcomics/src/main/java/org/fox/ttcomics2/junrar/io/ReadOnlyAccessInputStream.java


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/*
 * Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
 * Original author: Edmund Wagner
 * Creation date: 26.06.2007
 *
 * Source: $HeadURL$
 * Last changed: $LastChangedDate$
 * 
 * the unrar licence applies to all junrar source and binary distributions 
 * you are not allowed to use this source to re-create the RAR compression
 * algorithm
 * 
 * Here some html entities which can be used for escaping javadoc tags:
 * "&":  "&#038;" or "&amp;"
 * "<":  "&#060;" or "&lt;"
 * ">":  "&#062;" or "&gt;"
 * "@":  "&#064;" 
 */
package org.fox.ttcomics2.junrar.io;

import java.io.IOException;
import java.io.InputStream;

public class ReadOnlyAccessInputStream extends InputStream {
    private final long startPos;
    private final long endPos;
    private IReadOnlyAccess file;
    private long curPos;

    public ReadOnlyAccessInputStream(IReadOnlyAccess file, long startPos,
                                     long endPos) throws IOException {
        super();
        this.file = file;
        this.startPos = startPos;
        curPos = startPos;
        this.endPos = endPos;
        file.setPosition(curPos);
    }

    @Override
    public int read() throws IOException {
        if (curPos == endPos) {
            return -1;
        } else {
            int b = file.read();
            curPos++;
            return b;
        }
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        if (len == 0) {
            return 0;
        }
        if (curPos == endPos) {
            return -1;
        }
        int bytesRead = file.read(b, off,
                (int) Math.min(len, endPos - curPos));
        curPos += bytesRead;
        return bytesRead;
    }

    @Override
    public int read(byte[] b) throws IOException {
        return read(b, 0, b.length);
    }
//
//    public void close() throws IOException {
//        file.close();
//    }
}