/*
//
// Copyright (C) 2006-2018 Jean-François DEL NERO
//
// This file is part of the HxCFloppyEmulator library
//
// HxCFloppyEmulator may be used and distributed without restriction provided
// that this copyright statement is not removed from the file and that any
// derivative work contains the original copyright notice and the associated
// disclaimer.
//
// HxCFloppyEmulator is free software; you can redistribute it
// and/or modify  it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// HxCFloppyEmulator 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with HxCFloppyEmulator; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
//
*/
///////////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------------//
//-------------------------------------------------------------------------------//
//-----------H----H--X----X-----CCCCC----22222----0000-----0000------11----------//
//----------H----H----X-X-----C--------------2---0----0---0----0--1--1-----------//
//---------HHHHHH-----X------C----------22222---0----0---0----0-----1------------//
//--------H----H----X--X----C----------2-------0----0---0----0-----1-------------//
//-------H----H---X-----X---CCCCC-----222222----0000-----0000----1111------------//
//-------------------------------------------------------------------------------//
//----------------------------------------------------- http://hxc2001.free.fr --//
///////////////////////////////////////////////////////////////////////////////////
// File : gkh_loader.c
// Contains: Ensoniq GKH floppy image loader
//
// Written by:	DEL NERO Jean Francois
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "types.h"

#include "internal_libhxcfe.h"
#include "tracks/track_generator.h"
#include "libhxcfe.h"

#include "floppy_loader.h"
#include "floppy_utils.h"

#include "gkh_loader.h"
#include "gkh_format.h"

#include "libhxcadaptor.h"

int GKH_libIsValidDiskFile(HXCFE_IMGLDR * imgldr_ctx,char * imgfile)
{
	gkh_header header;
	FILE * f;

	imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"GKH_libIsValidDiskFile");

	if( hxc_checkfileext(imgfile,"gkh"))
	{

		f=hxc_fopen(imgfile,"rb");
		if(f==NULL)
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"GKH_libIsValidDiskFile : Cannot open %s !",imgfile);
			return HXCFE_ACCESSERROR;
		}

		hxc_fread(&header,sizeof(header),f);
		hxc_fclose(f);

		if(!memcmp(&header.header_tag,"TDDFI",5))
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"GKH_libIsValidDiskFile : GKH file !");
		}
		else
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"GKH_libIsValidDiskFile : Bad header !!");
			return HXCFE_BADFILE;
		}

		return HXCFE_VALIDFILE;
	}
	else
	{
		imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"GKH_libIsValidDiskFile : non GKH file !");
		return HXCFE_BADFILE;
	}
}

int GKH_libLoad_DiskFile(HXCFE_IMGLDR * imgldr_ctx,HXCFE_FLOPPY * floppydisk,char * imgfile,void * parameters)
{

	FILE * f;
	int i,j;
	int gap3len,interleave,startid;
	int rpm,sectorsize;
	HXCFE_CYLINDER* currentcylinder;
	int data_offset;
	int trackformat;
	int skew;
	gkh_header header;
	unsigned char tagbuffer[10];
	image_type_tag *img_type_tag;
	image_location_tag *img_location_tag;
	unsigned char * trackdata;
	int file_offset;

	sectorsize = 0;

	imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"GKH_libLoad_DiskFile %s",imgfile);

	f=hxc_fopen(imgfile,"rb");
	if(f==NULL)
	{
		imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"Cannot open %s !",imgfile);
		return HXCFE_ACCESSERROR;
	}

	data_offset=58;
	hxc_fread(&header,sizeof(header),f);

	if(!memcmp(&header.header_tag,"TDDFI",5) && header.version==1)
	{
		i=0;
		do
		{
			hxc_fread(&tagbuffer,10,f);
			switch(tagbuffer[0])
			{
				case 0x0A:
					img_type_tag=(image_type_tag *)&tagbuffer;
					sectorsize=img_type_tag->sectorsize;
					floppydisk->floppyNumberOfTrack=img_type_tag->nboftrack;
					floppydisk->floppyNumberOfSide=(unsigned char)img_type_tag->nbofheads;
					floppydisk->floppySectorPerTrack=img_type_tag->nbofsectors;
				break;

				case 0x0B:
					img_location_tag=(image_location_tag *)&tagbuffer;
					data_offset=img_location_tag->fileoffset;
				break;
			}
			i++;
		}while(i<header.numberoftags);

		floppydisk->floppyiftype=GENERIC_SHUGART_DD_FLOPPYMODE;
		floppydisk->floppyBitRate=250000;
		rpm=300;

		trackformat=IBMFORMAT_DD;

		skew=2;
		startid=0;
		gap3len=255;
		interleave=1;

		if(sectorsize)
		{
			floppydisk->tracks=(HXCFE_CYLINDER**)malloc(sizeof(HXCFE_CYLINDER*)*floppydisk->floppyNumberOfTrack);
			imgldr_ctx->hxcfe->hxc_printf(MSG_INFO_1,"%d tracks, %d side(s), %d sectors/track, gap3:%d, interleave:%d,rpm:%d",floppydisk->floppyNumberOfTrack,floppydisk->floppyNumberOfSide,floppydisk->floppySectorPerTrack,gap3len,interleave,rpm);

			trackdata=(unsigned char*)malloc(sectorsize*floppydisk->floppySectorPerTrack);

			for(j=0;j<floppydisk->floppyNumberOfTrack;j++)
			{

				floppydisk->tracks[j]=allocCylinderEntry(rpm,floppydisk->floppyNumberOfSide);
				currentcylinder=floppydisk->tracks[j];

				for(i=0;i<floppydisk->floppyNumberOfSide;i++)
				{
					hxcfe_imgCallProgressCallback(imgldr_ctx, (j<<1) + (i&1),floppydisk->floppyNumberOfTrack*2);

					file_offset=(sectorsize*(j*floppydisk->floppySectorPerTrack*floppydisk->floppyNumberOfSide))+
								(sectorsize*(floppydisk->floppySectorPerTrack)*i)+
								data_offset;

					fseek (f , file_offset , SEEK_SET);
					hxc_fread(trackdata,sectorsize*floppydisk->floppySectorPerTrack,f);

					currentcylinder->sides[i]=tg_generateTrack(trackdata,sectorsize,floppydisk->floppySectorPerTrack,(unsigned char)j,(unsigned char)i,startid,interleave,((j<<1)|(i&1))*skew,floppydisk->floppyBitRate,currentcylinder->floppyRPM,trackformat,gap3len,0,2500|NO_SECTOR_UNDER_INDEX,-2500);
				}
			}

			free(trackdata);

			imgldr_ctx->hxcfe->hxc_printf(MSG_INFO_1,"track file successfully loaded and encoded!");
			hxc_fclose(f);

			return HXCFE_NOERROR;
		}
	}

	imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"BAD GKH file!");
	hxc_fclose(f);
	return HXCFE_BADFILE;
}

int GKH_libGetPluginInfo(HXCFE_IMGLDR * imgldr_ctx,uint32_t infotype,void * returnvalue)
{

	static const char plug_id[]="ENSONIQ_GKH";
	static const char plug_desc[]="ENSONIQ GKH Loader";
	static const char plug_ext[]="gkh";

	plugins_ptr plug_funcs=
	{
		(ISVALIDDISKFILE)	GKH_libIsValidDiskFile,
		(LOADDISKFILE)		GKH_libLoad_DiskFile,
		(WRITEDISKFILE)		0,
		(GETPLUGININFOS)	GKH_libGetPluginInfo
	};

	return libGetPluginInfo(
			imgldr_ctx,
			infotype,
			returnvalue,
			plug_id,
			plug_desc,
			&plug_funcs,
			plug_ext
			);
}

