I have some problem have class in java. But now need have in php. it's possible rewrite? Code:

public class RealityStream {

    public RealityStream(byte abyte0[]) {
        m_dstream = null;
        m_dstream = new DataInputStream(new ByteArrayInputStream(abyte0));
    }

    public int available()
        throws IOException {
        return m_dstream.available();
    }

    public float readFloat()
        throws IOException {
        byte byte0 = m_dstream.readByte();
        byte byte1 = m_dstream.readByte();
        byte byte2 = m_dstream.readByte();
        byte byte3 = m_dstream.readByte();
        int i = (byte3 & 0xff) << 24 | (byte2 & 0xff) << 16
              | (byte1 & 0xff) << 8 | byte0 & 0xff;
        return Float.intBitsToFloat(i);
    }

    public int readInt()
        throws IOException {
        byte byte0 = m_dstream.readByte();
        byte byte1 = m_dstream.readByte();
        byte byte2 = m_dstream.readByte();
        byte byte3 = m_dstream.readByte();
        return (byte3 & 0xff) << 24 | (byte2 & 0xff) << 16
             | (byte1 & 0xff) << 8 | byte0 & 0xff;
    }

    public int readShort()
        throws IOException {
        byte byte0 = m_dstream.readByte();
        byte byte1 = m_dstream.readByte();
        return byte1 << 8 | byte0 & 0xff;
    }

    public int readUnsignedChar()
        throws IOException {
        return m_dstream.readUnsignedByte();
    }
    private DataInputStream m_dstream;
}

very need. very thaks.