/*
Copyright (c) 2003, Dan Kranz and Arnold Rom
All rights reserved.

Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:

    * Redistributions of source code must retain the above
      copyright notice, this list of conditions and the following
      disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials
      provided with the distribution.

    * The names of its contributors may not be used to endorse or
      promote products derived from this software without specific
      prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
//#include <unistd.h>
#include <roots.h>

// ##################################################################
//	read data base						    #
//								    #
//	output:	ReadBase       = TRUE if data base was read	    #
//			       = FALSE if we had an error	    #
//								    #
//	input:	pointer	to DataBaseStructure			    #
// ##################################################################

	BYTE ReadBase(DataBase* db)

// ----------------------------------------------------------------------------
{	// ReadBase START
// ----------------------------------------------------------------------------

	BYTE *stream,*block,*startOfStream,junkTable;
	char fspec[MAX_PATH];
	long  cpl,i,nbtabs;
	struct stat  buf;

//	translate the directory

	if(ReadAndTranslateDirectory(db)) return 1;

// ----------------------------------------------------------------------------
//	read the data base file
// ----------------------------------------------------------------------------

        if(stat(strcat(strcpy(fspec,db->name),".bas"),&buf)!=-1)  // empty ?

	{
	if(ReadBinFile(&stream,	&cpl,
                 strcat(strcpy(fspec,db->name),".bas"))) return 1;

	startOfStream=stream;

//	first 5	bytes contain:	rflag(10101010)	cpl nline

	if(*stream != 0xaa)
	  {
	   free(startOfStream);
           RootsError("invalid data base file\n");
	   return 1;
	  }

	cpl= *(stream+1)+0x100*(*(stream+2));
	db->base.nline=	*(stream+3)+0x100*(*(stream+4));

//	advance	pointer	to first data byte

	stream+=5;


//	open array to hold directory specified cpl

	ExpandBlock(db->base,db->base.nline);

//	move data to block based on actual versus directory cpl

	if(cpl == db->base.cpl)
	   {
	    memcpy(db->base.block,stream,db->base.cpl*db->base.nline);
	   }
	else if(cpl<db->base.cpl)
	   {
	    block=db->base.block;

	    for(i=0; i<db->base.nline; i++)
		{memcpy(block,stream,cpl); stream+=cpl;	block+=db->base.cpl;}
	   }
	else
	   {
	    block=db->base.block;

	    for(i=0; i<db->base.nline; i++)
		 {memcpy(block,stream,db->base.cpl);
					      stream+=cpl; block+=db->base.cpl;}
	   }

	free(startOfStream);
	}
// ----------------------------------------------------------------------------
//	read the tables	file
// ----------------------------------------------------------------------------

	if(stat(db->name,&buf)!=-1)			 // skip empties
	{
	if(ReadBinFile(&stream,	&cpl,db->name))	return 1;

	startOfStream=stream;

//	first 3	bytes contain:	rflag(01010101)	nbtabs

	if(*stream != 0x55)
	  {
	  free(startOfStream);
          RootsError("invalid tables file\n");
	  return 1;
	  }
	nbtabs=	*(stream+1)+0x100*(*(stream+2));

	stream+=3;

	if(nbtabs > db->nbtabs)	nbtabs=db->nbtabs;  // drop non-directory tabs

// --------------------------------
//	move one table at the time
// --------------------------------

	for(i=0; i<nbtabs; i++)
	{

//	first 5	bytes contain:	rflag(10101010)	cpl nline

	if(*stream != 0xaa)
	  {
	  free(startOfStream);
          RootsError("invalid tables file\n");
	  return 1;
	  }
	cpl= *(stream+1)+0x100*(*(stream+2));
	db->arx[i].nline= *(stream+3)+0x100*(*(stream+4));

	stream+=5;

//	skip epmties

	if(cpl==0 || db->arx[i].nline == 0) continue;

//      allow for junk table (i.e. Tony's removal)

	junkTable=FALSE;
	if(!db->arx[i].cpl)
	  {
	  junkTable=TRUE;
	  db->arx[i].cpl=cpl;
	  }

//	audit for valid	cpl

	if(cpl!=db->arx[i].cpl)
	  {
	  free(startOfStream);
          RootsError("data base table %d has wrong cpl\n",i+1);
	  return 1;
	  }

//	move into place

	ExpandBlock(db->arx[i],db->arx[i].nline);

	memcpy(db->arx[i].block,stream,db->arx[i].cpl*db->arx[i].nline);
	stream+=db->arx[i].cpl*db->arx[i].nline;

//	get rid	of junk	table

	if(junkTable)db->arx[i].nline=db->arx[i].cpl=0;
	}

	free(startOfStream);
	}						// read	tables END

	else		// check validity of empty
	{
	if(db->base.nline && db->nbtabs)
            {RootsError("** tables file for \"%s\" not found **\n",db->name);
								     return 1;}
	}
	return 0;

// ----------------------------------------------------------------------------
}	// ReadBase END
// ----------------------------------------------------------------------------