//  ==========================================================================//  //  @(#) $Id: L2_Codec.C,v 1.3 2000/10/13 15:45:51 brian Exp $//  //  --------------------------------------------------------------------------//  //  Copyright (C) 1997-2000  Brian Bidulock <bidulock@dallas.net>//  //  All Rights Reserved.//  //  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 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// //  Last Modified $Date: 2000/10/13 15:45:51 $ by $Author: brian $// //  --------------------------------------------------------------------------// //  $Log: L2_Codec.C,v $//  Revision 1.3  2000/10/13 15:45:51  brian//  First public release.////  ==========================================================================static char const ident[] = "$Id: L2_Codec.C,v 1.3 2000/10/13 15:45:51 brian Exp $";#pragma implementation#include "head.h"#include "L2_Codec.H"#include <unistd.h>Codec_SU::Codec_SU() :    Header("SU","Signal Unit",24,6,4,(Codec**)&BSN){    FISU = new Codec_FISU("FISU","Fill-In Signal Unit");    LSSU = new Codec_LSSU("LSSU","Link Status Signal Unit (1 byte)",1);    LSS2 = new Codec_LSSU("LSS2","Link Status Signal Unit (2 byte)",2);    MSU  = new Codec_MSU ("MSU", "Message Signal Unit");    BSN  = new Field("BSN","Backward Seq Number",   7,0);    BIB  = new Field("BIB","Backward Indicator Bit",1,0);    FSN  = new Field("FSN","Forward Seq Number",    7,0);    FIB  = new Field("FIB","Forward Indicator Bit" ,1,0);    LI   = new Field("LI" ,"Length Indicator"      ,6,2);    LI_B = new Bra("LI:","Length Indicator Branch",(Codec*)LI,        FISU,  0,        LSSU,  1,        LSS2,  2,        MSU ,  3,        MSU , -1,        NULL);};voidCodec_SU::decode(FramePointer& p) {    Header::decode(p);    if (MSU->exists) {        int v = MSU->frame.size>>3;        if (v>63) v = 63;        if (!LI->test(v)) { LI->invalid = true; invalid = true; throw Invalid(label); }    }};voidCodec_SU::encode(FramePointer& p) {    Header::encode(p);    if (MSU->exists) {        int v = MSU->frame.size>>3;        if (v>63) v = 63;        LI->set(v);        FramePointer x(LI->frame);        LI->encode(x);    }};Codec_FISU::Codec_FISU(char* l,char* t) :    Content(l,t,0,0,0,NULL) {};Codec_LSSU::Codec_LSSU(char* l,char* t,int s) :    Content(l,t,s*8,1,0,(Codec**)&SF){    SF  = new Set("SF","Sig Info Octet Field",5,(s*8)-5,        "SIO",  0,  "'0' (out of alignment)",        "SIN",  1,  "'N' (normal alignment)",        "SIE",  2,  "'E' (emergency alignment)",        "SIOS", 3,  "'OS' (out of service)",        "SIPO", 4,  "'PO' (processor outage)",        "SIB",  5,  "'B' (busy)",        NULL);};Codec_MSU::Codec_MSU(char* l,char* t) :    Content(l,t,-1,1,0,(Codec**)&PDU){    PDU = new OctetString("PDU","Protocol Data Unit",-1);};