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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
There is a newer version: 2.1.39
/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" 
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.netbios;


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


/**
 *
 */
public abstract class SessionServicePacket {

    // session service packet types
    static final int SESSION_MESSAGE = 0x00;
    static final int SESSION_REQUEST = 0x81;

    /**
     * 
     */
    public static final int POSITIVE_SESSION_RESPONSE = 0x82;

    /**
     * 
     */
    public static final int NEGATIVE_SESSION_RESPONSE = 0x83;
    static final int SESSION_RETARGET_RESPONSE = 0x84;
    static final int SESSION_KEEP_ALIVE = 0x85;

    static final int MAX_MESSAGE_SIZE = 0x0001FFFF;
    static final int HEADER_LENGTH = 4;


    static void writeInt2 ( int val, byte[] dst, int dstIndex ) {
        dst[ dstIndex++ ] = (byte) ( ( val >> 8 ) & 0xFF );
        dst[ dstIndex ] = (byte) ( val & 0xFF );
    }


    static void writeInt4 ( int val, byte[] dst, int dstIndex ) {
        dst[ dstIndex++ ] = (byte) ( ( val >> 24 ) & 0xFF );
        dst[ dstIndex++ ] = (byte) ( ( val >> 16 ) & 0xFF );
        dst[ dstIndex++ ] = (byte) ( ( val >> 8 ) & 0xFF );
        dst[ dstIndex ] = (byte) ( val & 0xFF );
    }


    static int readInt2 ( byte[] src, int srcIndex ) {
        return ( ( src[ srcIndex ] & 0xFF ) << 8 ) + ( src[ srcIndex + 1 ] & 0xFF );
    }


    static int readInt4 ( byte[] src, int srcIndex ) {
        return ( ( src[ srcIndex ] & 0xFF ) << 24 ) + ( ( src[ srcIndex + 1 ] & 0xFF ) << 16 ) + ( ( src[ srcIndex + 2 ] & 0xFF ) << 8 )
                + ( src[ srcIndex + 3 ] & 0xFF );
    }


    static int readLength ( byte[] src, int srcIndex ) {
        srcIndex++;
        return ( ( src[ srcIndex++ ] & 0x01 ) << 16 ) + ( ( src[ srcIndex++ ] & 0xFF ) << 8 ) + ( src[ srcIndex++ ] & 0xFF );
    }


    static int readn ( InputStream in, byte[] b, int off, int len ) throws IOException {
        int i = 0, n;

        while ( i < len ) {
            n = in.read(b, off + i, len - i);
            if ( n <= 0 ) {
                break;
            }
            i += n;
        }

        return i;
    }


    static int readPacketType ( InputStream in, byte[] buffer, int bufferIndex ) throws IOException {
        int n;
        if ( ( n = readn(in, buffer, bufferIndex, HEADER_LENGTH) ) != HEADER_LENGTH ) {
            if ( n == -1 ) {
                return -1;
            }
            throw new IOException("unexpected EOF reading netbios session header");
        }
        int t = buffer[ bufferIndex ] & 0xFF;
        return t;
    }

    int type, length;


    /**
     * @param dst
     * @param dstIndex
     * @return written bytes
     */
    public int writeWireFormat ( byte[] dst, int dstIndex ) {
        this.length = writeTrailerWireFormat(dst, dstIndex + HEADER_LENGTH);
        writeHeaderWireFormat(dst, dstIndex);
        return HEADER_LENGTH + this.length;
    }


    int readWireFormat ( InputStream in, byte[] buffer, int bufferIndex ) throws IOException {
        readHeaderWireFormat(in, buffer, bufferIndex);
        return HEADER_LENGTH + readTrailerWireFormat(in, buffer, bufferIndex);
    }


    int writeHeaderWireFormat ( byte[] dst, int dstIndex ) {
        dst[ dstIndex++ ] = (byte) this.type;
        if ( this.length > 0x0000FFFF ) {
            dst[ dstIndex ] = (byte) 0x01;
        }
        dstIndex++;
        writeInt2(this.length, dst, dstIndex);
        return HEADER_LENGTH;
    }


    int readHeaderWireFormat ( InputStream in, byte[] buffer, int bufferIndex ) {
        this.type = buffer[ bufferIndex++ ] & 0xFF;
        this.length = ( ( buffer[ bufferIndex ] & 0x01 ) << 16 ) + readInt2(buffer, bufferIndex + 1);
        return HEADER_LENGTH;
    }


    abstract int writeTrailerWireFormat ( byte[] dst, int dstIndex );


    abstract int readTrailerWireFormat ( InputStream in, byte[] buffer, int bufferIndex ) throws IOException;
}