FFUInt32.cc

 
// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of ff_handler a FreeForm API handler for the OPeNDAP
// DAP2 data server.
 
// Copyright (c) 2005 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This 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 software 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
// (c) COPYRIGHT URI/MIT 1997-99
// Please read the full copyright statement in the file COPYRIGHT.
//
// Authors:
//      ReZa       Reza Nekovei (reza@intcomm.net)
 
#include "config_ff.h"
 
static char rcsid[] not_used = {"$Id$"};
 
 
#include "FFUInt32.h"
#include "util_ff.h"
#include <libdap/util.h>
 
#include <cstring>
 
extern long BufPtr;
extern char *BufVal;
 
FFUInt32::FFUInt32(const string &n, const string &d) : UInt32(n, d)
{
}
 
BaseType *
FFUInt32::ptr_duplicate(){
 
    return new FFUInt32(*this);
}
 
bool
FFUInt32::read()
{
    if (read_p()) // nothing to do
        return true;
 
    // *** I don't know why no error is signaled when there's no data in
    // BufVal. 10/11/2000 jhrg
 
    if(BufVal){ // data in cache
        char * ptr = BufVal+BufPtr;
    
        dods_uint32 align;
        if (width() > sizeof(align))
            throw InternalErr(__FILE__, __LINE__, "UInt32 size.");      
 
        memcpy((void*)&align, (void *)ptr, width());
    
        val2buf((void *) &align);
        set_read_p(true);
    
        BufPtr += width();
 
        return true;
    }
        
    return false;
}