/* jcifs smb client library in Java
* Copyright (C) 2000 "Michael B. Allen" <jcifs at samba dot org>
*
* 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 com.knowgate.jcifs.netbios;
import java.io.IOException;
import java.io.InputStream;
abstract class SessionServicePacket {
// session service packet types
static final int SESSION_MESSAGE = 0x00;
static final int SESSION_REQUEST = 0x81;
static final int POSITIVE_SESSION_RESPONSE = 0x82;
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 readPacketType( InputStream in,
byte[] buffer,
int bufferIndex )
throws IOException {
int n;
if(( n = in.read( 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;
int writeWireFormat( byte[] dst, int dstIndex ) {
length = writeTrailerWireFormat( dst, dstIndex + HEADER_LENGTH );
writeHeaderWireFormat( dst, dstIndex );
return HEADER_LENGTH + 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)type;
if( length > 0x0000FFFF ) {
dst[dstIndex] = (byte)0x01;
}
dstIndex++;
writeInt2( length, dst, dstIndex );
return HEADER_LENGTH;
}
int readHeaderWireFormat( InputStream in,
byte[] buffer,
int bufferIndex )
throws IOException {
type = buffer[bufferIndex++] & 0xFF;
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;
}