/*
//
// 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 : emax_loader.c
// Contains: Emax 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 "emax_loader.h"

#include "libhxcadaptor.h"

#define SCTR_SIZE 512
#define HEADS 2
#define SCTR_TRK 10
#define TRK_CYL 80
#define START_SCTR 1
#define END_SCTR 10

#define RWDISK_VERSION "1.1"
#define RWDISK_DATE "Fri Mar 19 13:31:05 1993"
#define EMAXUTIL_HDR "emaxutil v%3s %24s\n"
#define EMAXUTIL_HDRLEN 39



#define BANK_LOW 368
#define BANK_HIGH 423
#define SAMPLE_LOW 440
#define SAMPLE_HIGH 1463
#define OS1_LOW 0
#define OS1_HIGH 367
#define OS2_LOW 424
#define OS2_HIGH 439
#define OS3_LOW 1464
#define OS3_HIGH 1599
#define TOTAL_BLKS ((BANK_HIGH-BANK_LOW)+(SAMPLE_HIGH-SAMPLE_LOW))
#define TOTAL_OS ((OS1_HIGH-OS1_LOW)+(OS2_HIGH-OS2_LOW)+(OS3_HIGH-OS3_LOW))


int EMAX_libIsValidDiskFile(HXCFE_IMGLDR * imgldr_ctx,char * imgfile)
{
	int filesize;

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

	if( hxc_checkfileext(imgfile,"em1") ||
		hxc_checkfileext(imgfile,"em2") ||
		hxc_checkfileext(imgfile,"emx")
		)
	{

		filesize=hxc_getfilesize(imgfile);
		if(filesize<0)
		{
			imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"EMAX_libIsValidDiskFile : Cannot open %s !",imgfile);
			return HXCFE_ACCESSERROR;
		}

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

}

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

	FILE * f,*f2;
	unsigned int filesize;
	int i,j,k;
	unsigned int file_offset;
	unsigned char* floppy_data;
	char os_filename[512];
	int gap3len,interleave;
	int rpm;
	int numberofsector;
	int trackformat,skew;

	HXCFE_CYLINDER* currentcylinder;
	HXCFE_SECTCFG  sectorconfig[10];

	char hdr[EMAXUTIL_HDRLEN+1];
	char fhdr[EMAXUTIL_HDRLEN+1];

	imgldr_ctx->hxcfe->hxc_printf(MSG_DEBUG,"EMAX_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;
	}

	filesize = hxc_fgetsize(f);

	numberofsector=10;

	strcpy(os_filename,imgfile);
	i=strlen(os_filename)-1;
	while(i && (os_filename[i]!='\\') && (os_filename[i]!='/') )
	{

		i--;
	}
	if(i)
	{
		i++;
	}
	sprintf(&os_filename[i],"emaxos.emx");

	f2=hxc_fopen(os_filename,"rb");
	if(f2==NULL)
	{
		imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"Cannot open os file %s !",os_filename);
	}

	if(filesize!=0)
	{
		gap3len=30;
		interleave=1;
		skew=2;
		trackformat=IBMFORMAT_DD;
		floppydisk->floppyNumberOfSide=2;
		floppydisk->floppySectorPerTrack=10;
		floppydisk->floppyNumberOfTrack=80;

		if(1)
		{
			floppydisk->floppyBitRate=250000;
			floppydisk->floppyiftype=GENERIC_SHUGART_DD_FLOPPYMODE;
			floppydisk->tracks=(HXCFE_CYLINDER**)malloc(sizeof(HXCFE_CYLINDER*)*floppydisk->floppyNumberOfTrack);

			rpm=300; // normal rpm

			imgldr_ctx->hxcfe->hxc_printf(MSG_INFO_1,"filesize:%dkB, %d tracks, %d side(s), %d sectors/track, gap3:%d, interleave:%d,rpm:%d",filesize/1024,floppydisk->floppyNumberOfTrack,floppydisk->floppyNumberOfSide,floppydisk->floppySectorPerTrack,gap3len,interleave,rpm);

			floppy_data= malloc((SCTR_SIZE * SCTR_TRK) * TRK_CYL * HEADS);
			memset(floppy_data,0xF6,(SCTR_SIZE * SCTR_TRK) * TRK_CYL * HEADS);

			sprintf (hdr, EMAXUTIL_HDR, RWDISK_VERSION, RWDISK_DATE);
			hdr[EMAXUTIL_HDRLEN]=0;

			hxc_fread (fhdr, (unsigned int) EMAXUTIL_HDRLEN,f);
			fhdr[EMAXUTIL_HDRLEN]=0;


			if (strncmp(fhdr, hdr, EMAXUTIL_HDRLEN)!=0)
			{
				imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"Wrong version: disk says %s", fhdr);
				hxc_fclose(f);
				if(f2)
					hxc_fclose(f2);
				return HXCFE_BADFILE;
			}

			if(f2)
			{
				for(i=OS1_LOW;i<=OS1_HIGH;i++)
				{
					hxc_fread(&floppy_data[i*512],512,f2);
				}

				for(i=OS2_LOW;i<=OS2_HIGH;i++)
				{
					hxc_fread(&floppy_data[i*512],512,f2);
				}

				for(i=OS3_LOW;i<=OS3_HIGH;i++)
				{
					hxc_fread(&floppy_data[i*512],512,f2);
				}
			}

			for(i=BANK_LOW;i<=BANK_HIGH;i++)
			{
				hxc_fread(&floppy_data[i*512],512,f);
			}

			for(i=SAMPLE_LOW;i<=SAMPLE_HIGH;i++)
			{
				hxc_fread(&floppy_data[i*512],512,f);
			}

			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=( (((numberofsector)*512)) * floppydisk->floppyNumberOfSide * j ) +
						        ( (((numberofsector)*512)) * i );

					memset(sectorconfig,0,sizeof(HXCFE_SECTCFG)*10);
					for(k=0;k<10;k++)
					{
						sectorconfig[k].head = i;
						sectorconfig[k].cylinder = j;
						sectorconfig[k].sector = k + 1;
						sectorconfig[k].sectorsize = 512;
						sectorconfig[k].bitrate = floppydisk->floppyBitRate;
						sectorconfig[k].gap3 = gap3len;
						sectorconfig[k].trackencoding = trackformat;
						sectorconfig[k].input_data = &floppy_data[file_offset+(k*512)];
					}

					currentcylinder->sides[i]=tg_generateTrackEx(floppydisk->floppySectorPerTrack,(HXCFE_SECTCFG *)&sectorconfig,interleave,((j<<1)|(i&1))*skew,floppydisk->floppyBitRate,rpm,trackformat,0,2500|NO_SECTOR_UNDER_INDEX,-2500);
				}
			}

			free(floppy_data);

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

			hxc_fclose(f);
			if(f2)
				hxc_fclose(f2);
			return HXCFE_NOERROR;

		}
		hxc_fclose(f);
		if(f2)
			hxc_fclose(f2);
		return HXCFE_FILECORRUPTED;
	}

	imgldr_ctx->hxcfe->hxc_printf(MSG_ERROR,"file size=%d !?",filesize);
	hxc_fclose(f);
	if(f2)
		hxc_fclose(f2);
	return HXCFE_BADFILE;
}

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

	static const char plug_id[]="EMAX_EM";
	static const char plug_desc[]="EMAX EM1 & EM2 Loader";
	static const char plug_ext[]="em1";

	plugins_ptr plug_funcs=
	{
		(ISVALIDDISKFILE)	EMAX_libIsValidDiskFile,
		(LOADDISKFILE)		EMAX_libLoad_DiskFile,
		(WRITEDISKFILE)		0,
		(GETPLUGININFOS)	EMAX_libGetPluginInfo
	};

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

