include/dted/dfad_record.h

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/*******************************************************************************
** Copyright (c) 2003 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/
/*******************************************************************************
** $RCSfile: dfad_record.h,v $ $Revision: 1.7 $ $State: Exp $
*******************************************************************************/

// 
//   Define a dfad data record (2709 bytes in blocks of 36 bit words.
//   It permits access to a specific word, or read it sequentially from a
//   point, assking for:
//   a feature : 2 words
//   a coord   : a word
//   checksum  : a word
//   a zero word.
//
//   It has two methods to access the record data:
//   1. Directly using 
//    getData(from, howMany, where) : from which word, how many words (must be leess than 602 - from)
//
//   2. Setting a sequential pointer and using sequential readers
//    setPointerToWord(int i = 0); i <= 601 : sets the pointer to word i
//    getFeature(pfeature): gets next feature data size (two words)
//    getCoord(pCoord): gets next coord data size ( word)
//    getWords(pWords, howMany): gets howMany words
//  For more details, see dfad_main.doc
//


#ifndef __DFADRECORD
#define __DFADRECORD

#include "dted/dtedDefines.h"
#include <stdio.h>
#include <vlutil/vlMachineTypes.h>

class DT_DLL_dted DtDfadRecord
{
public:

   DtDfadRecord();

  virtual bool setFile(FILE *f);

   // Operations based in the pointer location
   virtual bool getWords(DtU8 *pword, int howMany = 1);

protected:

   // read from the file a record
   virtual bool read();

   // move from the record to the buffer
   virtual bool moveWords(DtU8 *pword, int howMany = 1, int offsetInWords = 0);

   DtU8 myData[2709]; //see dfad explanation for 2709

   int  myPointerLocation;
   int  myWordsAvailable;
   int  myCurrentWord;

   bool myLoaded;

   FILE *myFile;

   bool myAlignToByte;
};

#endif