BytesInputStream.java

/***
 * Copyright 2002-2010 jamod development team
 *
 * 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 net.wimpi.modbus.io;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;

/**
 * Class implementing a byte array input stream with
 * a DataInput interface.
 *
 * @author Dieter Wimberger
 * @version @version@ (@date@)
 */
public class BytesInputStream extends FastByteArrayInputStream implements DataInput {

    DataInputStream m_Din;

    /**
     * Constructs a new <tt>BytesInputStream</tt> instance,
     * with an empty buffer of a given size.
     *
     * @param size the size of the input buffer.
     */
    public BytesInputStream(int size) {
        super(new byte[size]);
        m_Din = new DataInputStream(this);
    }// BytesInputStream

    /**
     * Constructs a new <tt>BytesInputStream</tt> instance,
     * that will read from the given data.
     *
     * @param data a byte array containing data to be read.
     */
    public BytesInputStream(byte[] data) {
        super(data);
        m_Din = new DataInputStream(this);
    }// BytesInputStream

    /**
     * Resets this <tt>BytesInputStream</tt> using the given
     * byte[] as new input buffer.
     *
     * @param data a byte array with data to be read.
     */
    public void reset(byte[] data) {
        // System.out.println("reset(byte[])::count=" + count + " pos=" + pos);
        pos = 0;
        mark = 0;
        buf = data;
        count = data.length;
    }// reset

    /**
     * Resets this <tt>BytesInputStream</tt> using the given
     * byte[] as new input buffer and a given length.
     *
     * @param data a byte array with data to be read.
     * @param length the length of the buffer to be considered.
     */
    public void reset(byte[] data, int length) {
        pos = 0;
        mark = 0;
        count = length;
        buf = data;
        readlimit = -1;
        // System.out.println("reset(byte[],int)::count=" + count + " pos=" + pos);
    }// reset

    /**
     * Resets this <tt>BytesInputStream</tt> assigning the input buffer
     * a new length.
     *
     * @param length the length of the buffer to be considered.
     */
    public void reset(int length) {
        // System.out.println("reset(int)::count=" + count + " pos=" + pos);
        pos = 0;
        count = length;
    }// reset

    /**
     * Skips the given number of bytes or all bytes till the end
     * of the assigned input buffer length.
     *
     * @param n the number of bytes to be skipped as <tt>int</tt>.
     * @return the number of bytes skipped.
     */
    public int skip(int n) {
        mark(pos);
        pos += n;
        return n;
    }// skip

    /**
     * Returns the reference to the input buffer.
     *
     * @return the reference to the <tt>byte[]</tt> input buffer.
     */
    @Override
    public byte[] getBuffer() {
        return buf;
    }// getBuffer

    public int getBufferLength() {
        return buf.length;
    }// getBufferLength

    @Override
    public void readFully(byte b[]) throws IOException {
        m_Din.readFully(b);
    }// readFully

    @Override
    public void readFully(byte b[], int off, int len) throws IOException {
        m_Din.readFully(b, off, len);
    }// readFully

    @Override
    public int skipBytes(int n) throws IOException {
        return m_Din.skipBytes(n);
    }// skipBytes

    @Override
    public boolean readBoolean() throws IOException {
        return m_Din.readBoolean();
    }// readBoolean

    @Override
    public byte readByte() throws IOException {
        return m_Din.readByte();
    }

    @Override
    public int readUnsignedByte() throws IOException {
        return m_Din.readUnsignedByte();
    }// readUnsignedByte

    @Override
    public short readShort() throws IOException {
        return m_Din.readShort();
    }// readShort

    @Override
    public int readUnsignedShort() throws IOException {
        return m_Din.readUnsignedShort();
    }// readUnsignedShort

    @Override
    public char readChar() throws IOException {
        return m_Din.readChar();
    }// readChar

    @Override
    public int readInt() throws IOException {
        return m_Din.readInt();
    }// readInt

    @Override
    public long readLong() throws IOException {
        return m_Din.readLong();
    }// readLong

    // @commentstart@
    @Override
    public float readFloat() throws IOException {
        return m_Din.readFloat();
    }// readFloat

    @Override
    public double readDouble() throws IOException {
        return m_Din.readDouble();
    }// readDouble
     // @commentend@

    @Override
    public String readLine() throws IOException {
        throw new IOException("Not supported.");
    }// readLine

    @Override
    public String readUTF() throws IOException {
        return m_Din.readUTF();
    }// readUTF

}// class BytesInputStream