/*
   Copyright 2011 - 2017 Volker Berlin (i-net software)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

*/
package de.inetsoftware.classparser;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;

/**
 * Extends the DataInputStream with a code position.
 * @author Volker Berlin
 */
public class CodeInputStream extends DataInputStream {

    /**
     * Create a new instance of CodeInputStream.
     * @param buf
     * @param offset
     * @param length
     */
    CodeInputStream( byte[] buf, int offset, int length) {
        this( new ByteCodeArrayInputStream( buf, offset, length ) );
    }

    private CodeInputStream( ByteCodeArrayInputStream in ) {
        super( in );
    }

    /**
     * Get the code index of the current read position.
     */
    public int getCodePosition() {
        return ((ByteCodeArrayInputStream)in).getCodePosition();
    }

    private static class ByteCodeArrayInputStream extends ByteArrayInputStream {

        ByteCodeArrayInputStream( byte[] buf, int offset, int length ) {
            super( buf, offset, length );
        }

        int getCodePosition() {
            return pos;
        }
    }
}