if ( this.largeFile ) {
            SMBUtil.writeInt2(this.pid, dst, dstIndex);
            SMBUtil.writeInt4(this.byteOffset >> 32, dst, dstIndex + 4);
            SMBUtil.writeInt4(this.byteOffset & 0xFFFFFFFF, dst, dstIndex + 8);
            SMBUtil.writeInt4(this.lengthInBytes >> 32, dst, dstIndex + 12);
            SMBUtil.writeInt4(this.lengthInBytes & 0xFFFFFFFF, dst, dstIndex + 16);
            return 20;

        SMBUtil.writeInt2(this.creditCharge, dst, dstIndex + 6);
        SMBUtil.writeInt2(this.command, dst, dstIndex + 12);
        SMBUtil.writeInt2(this.credit, dst, dstIndex + 14);
        SMBUtil.writeInt4(this.flags, dst, dstIndex + 16);
        SMBUtil.writeInt4(this.nextCommand, dst, dstIndex + 20);
        SMBUtil.writeInt8(this.mid, dst, dstIndex + 24);

        if ( this.async ) {

        int start = dstIndex;

        SMBUtil.writeInt2(this.tflags, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.desiredAccess, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.searchAttributes, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.fileAttributes, dst, dstIndex);
        dstIndex += 2;
        this.creationTime = 0;

        int start = dstIndex;
        SMBUtil.writeInt2(36, dst, dstIndex);
        SMBUtil.writeInt2(this.dialects.length, dst, dstIndex + 2);
        dstIndex += 4;

        SMBUtil.writeInt2(this.securityMode, dst, dstIndex);
        SMBUtil.writeInt2(0, dst, dstIndex + 2); // Reserved
        dstIndex += 4;

        SMBUtil.writeInt4(this.capabilities, dst, dstIndex);
        dstIndex += 4;

/**
 * @author mbechler
 *
 */
@SuppressWarnings ( "javadoc" )
public class SMBUtil {

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


    public static void writeInt4 ( long val, byte[] dst, int dstIndex ) {
        dst[ dstIndex ] = (byte) ( val );
        dst[ ++dstIndex ] = (byte) ( val >>= 8 );

        int start = dstIndex;

        writeInt2( fid, dst, dstIndex );
        dstIndex += 2;
        writeInt4( offset, dst, dstIndex );
        dstIndex += 4;
        writeInt2( maxCount, dst, dstIndex );
        dstIndex += 2;
        writeInt2( minCount, dst, dstIndex );
        dstIndex += 2;
        writeInt4( openTimeout, dst, dstIndex );
        dstIndex += 4;
        writeInt2( remaining, dst, dstIndex );

        int start = dstIndex;

        writeInt2( flags, dst, dstIndex );
        dstIndex += 2;
        writeInt2( desiredAccess, dst, dstIndex );
        dstIndex += 2;
        writeInt2( searchAttributes, dst, dstIndex );
        dstIndex += 2;
        writeInt2( fileAttributes, dst, dstIndex );
        dstIndex += 2;
        creationTime = 0;
        writeInt4( creationTime, dst, dstIndex );
        dstIndex += 4;

        int start = dstIndex;

        SMBUtil.writeInt2(25, dst, dstIndex);

        dst[ dstIndex + 2 ] = (byte) ( this.sessionBinding ? 0x1 : 0 );
        dst[ dstIndex + 3 ] = (byte) ( this.securityMode );
        dstIndex += 4;

        SMBUtil.writeInt4(this.capabilities, dst, dstIndex);
        dstIndex += 4;
        SMBUtil.writeInt4(0, dst, dstIndex); // Channel
        dstIndex += 4;

    }


    private static byte[] encode ( byte[] customData, byte[] machineId ) {
        int size = 8 + 8 + 32;
        byte[] enc = new byte[size];
        SMBUtil.writeInt4(size, enc, 0);
        SMBUtil.writeInt4(0, enc, 4);
        System.arraycopy(customData, 0, enc, 8, 8);
        System.arraycopy(machineId, 0, enc, 16, 32);
        return enc;
    }

        int start = dstIndex;

        SMBUtil.writeInt2(this.fid, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt4(this.offset, dst, dstIndex);
        dstIndex += 4;
        SMBUtil.writeInt2(this.maxCount, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.minCount, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt4(this.openTimeout, dst, dstIndex);
        dstIndex += 4;