ref: b53e17078150a42cc74e78e3f4327457c66854e0
dir: /src/rgbfix/main.c/
/*
* RGBFix : Perform various tasks on a Gameboy image-file
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asmotor.h"
/*
* Option defines
*
*/
#define OPTF_DEBUG 0x01L
#define OPTF_PAD 0x02L
#define OPTF_VALIDATE 0x04L
#define OPTF_TITLE 0x08L
#define OPTF_TRUNCATE 0x10L
unsigned long ulOptions;
/*
* Misc. variables
*
*/
unsigned char NintendoChar[48]=
{
0xCE,0xED,0x66,0x66,0xCC,0x0D,0x00,0x0B,0x03,0x73,0x00,0x83,0x00,0x0C,0x00,0x0D,
0x00,0x08,0x11,0x1F,0x88,0x89,0x00,0x0E,0xDC,0xCC,0x6E,0xE6,0xDD,0xDD,0xD9,0x99,
0xBB,0xBB,0x67,0x63,0x6E,0x0E,0xEC,0xCC,0xDD,0xDC,0x99,0x9F,0xBB,0xB9,0x33,0x3E
};
/*
* Misc. routines
*
*/
void PrintUsage( void )
{
printf( "RGBFix v" RGBFIX_VERSION " (part of ASMotor " ASMOTOR_VERSION ")\n\n" );
printf( "Usage: rgbfix [options] image[.gb]\n" );
printf( "Options:\n" );
printf( "\t-h\t\tThis text\n" );
printf( "\t-d\t\tDebug: Don't change image\n" );
printf( "\t-p\t\tPad image to valid size\n\t\t\tPads to 32/64/128/256/512kB as appropriate\n" );
printf( "\t-r\t\ttRuncate image to valid size\n\t\t\tTruncates to 32/64/128/256/512kB as appropriate\n" );
printf( "\t-t<name>\tChange cartridge title field (16 characters)\n" );
printf( "\t-v\t\tValidate header\n\t\t\tCorrects - Nintendo Character Area (0x0104)\n\t\t\t\t - ROM type (0x0147)\n\t\t\t\t - ROM size (0x0148)\n\t\t\t\t - Checksums (0x014D-0x014F)\n" );
exit( 0 );
}
void FatalError( char *s )
{
printf( "\n***ERROR: %s\n\n", s );
PrintUsage();
}
long int FileSize( FILE *f )
{
long prevpos;
long r;
fflush( f );
prevpos=ftell( f );
fseek( f, 0, SEEK_END );
r=ftell( f );
fseek( f, prevpos, SEEK_SET );
return( r );
}
int FileExists( char *s )
{
FILE *f;
if( (f=fopen(s,"rb"))!=NULL )
{
fclose( f );
return( 1 );
}
else
return( 0 );
}
/*
* Das main
*
*/
int main( int argc, char *argv[] )
{
int argn=1;
char filename[512];
char cartname[32];
FILE *f;
ulOptions=0;
if( (--argc)==0 )
PrintUsage();
while( *argv[argn]=='-' )
{
argc-=1;
switch( argv[argn++][1] )
{
case '?':
case 'h':
PrintUsage();
break;
case 'd':
ulOptions|=OPTF_DEBUG;
break;
case 'p':
ulOptions|=OPTF_PAD;
break;
case 'r':
ulOptions|=OPTF_TRUNCATE;
break;
case 'v':
ulOptions|=OPTF_VALIDATE;
break;
case 't':
strncpy( cartname, argv[argn-1]+2, 16 );
ulOptions|=OPTF_TITLE;
break;
}
}
strcpy( filename, argv[argn++] );
if( !FileExists(filename) )
strcat( filename, ".gb" );
if( (f=fopen(filename,"rb+"))!=NULL )
{
/*
* -d (Debug) option code
*
*/
if( ulOptions&OPTF_DEBUG )
{
printf( "-d (Debug) option enabled...\n" );
}
/*
* -p (Pad) option code
*
*/
if( ulOptions&OPTF_PAD )
{
long size, padto;
long bytesadded=0;
size=FileSize( f );
padto=0x8000L;
while( size>padto )
padto*=2;
printf( "Padding to %ldkB:\n", padto/1024 );
/*
if( padto<=0x80000L )
{
*/
if( size!=padto )
{
fflush( stdout );
fseek( f, 0, SEEK_END );
while( size<padto )
{
size+=1;
if( (ulOptions&OPTF_DEBUG)==0 )
fputc( 0, f );
bytesadded+=1;
}
fflush( f );
printf( "\tAdded %ld bytes\n", bytesadded );
}
else
printf( "\tNo padding needed\n" );
/*
}
else
FatalError( "Image size exceeds 512kB" );
*/
}
/*
* -r (Truncate) option code
*
*/
if( ulOptions&OPTF_TRUNCATE )
{
long size, padto;
char tempfile[512];
FILE *tf;
size=FileSize( f );
padto=256*32768;
while( size<padto )
padto/=2;
printf( "Truncating to %ldkB:\n", padto/1024 );
tmpnam( tempfile );
if( (ulOptions&OPTF_DEBUG)==0 )
{
if( (tf=fopen(tempfile,"wb"))!=NULL )
{
fseek( f, 0, SEEK_SET );
while( padto-- )
{
fputc( fgetc(f), tf );
}
fclose( f );
fclose( tf );
remove( filename );
rename( tempfile, filename );
f=fopen( filename, "rb+" );
}
}
}
/*
* -t (Set carttitle) option code
*
*/
if( ulOptions&OPTF_TITLE )
{
printf( "Setting cartridge title:\n" );
if( (ulOptions&OPTF_DEBUG)==0 )
{
fflush( f );
fseek( f, 0x0134L, SEEK_SET );
fwrite( cartname, 16, 1, f );
fflush( f );
}
printf( "\tTitle set to %s\n", cartname );
}
/*
* -v (Validate header) option code
*
*/
if( ulOptions&OPTF_VALIDATE )
{
long i, byteschanged=0;
long cartromsize, calcromsize=0, filesize;
long carttype;
unsigned short cartchecksum=0, calcchecksum=0;
unsigned char cartcompchecksum=0, calccompchecksum=0;
int ch;
printf( "Validating header:\n" );
fflush( stdout );
/* Nintendo Character Area */
fflush( f );
fseek( f, 0x0104L, SEEK_SET );
for( i=0; i<48; i+=1 )
{
int ch;
ch=fgetc( f );
if( ch==EOF )
ch=0x00;
if( ch!=NintendoChar[i] )
{
byteschanged+=1;
if( (ulOptions&OPTF_DEBUG)==0 )
{
fseek( f, -1, SEEK_CUR );
fputc( NintendoChar[i], f );
fflush( f );
}
}
}
fflush( f );
if( byteschanged )
printf( "\tChanged %ld bytes in the Nintendo Character Area\n", byteschanged );
else
printf( "\tNintendo Character Area is OK\n" );
/* ROM size */
fflush( f );
fseek( f, 0x0148L, SEEK_SET );
cartromsize=fgetc( f );
if( cartromsize==EOF )
cartromsize=0x00;
filesize=FileSize( f );
while( filesize>(0x8000L<<calcromsize) )
calcromsize+=1;
if( calcromsize!=cartromsize )
{
if( (ulOptions&OPTF_DEBUG)==0 )
{
fseek( f, -1, SEEK_CUR );
fputc( calcromsize, f );
fflush( f );
}
printf( "\tChanged ROM size byte from 0x%02lX (%ldkB) to 0x%02lX (%ldkB)\n",
cartromsize, (0x8000L<<cartromsize)/1024,
calcromsize, (0x8000L<<calcromsize)/1024 );
}
else
printf( "\tROM size byte is OK\n" );
/* Cartridge type */
fflush( f );
fseek( f, 0x0147L, SEEK_SET );
carttype=fgetc( f );
if( carttype==EOF )
carttype=0x00;
if( FileSize(f)>0x8000L )
{
/* carttype byte must != 0x00 */
if( carttype==0x00 )
{
if( (ulOptions&OPTF_DEBUG)==0 )
{
fseek( f, -1, SEEK_CUR );
fputc( 0x01, f );
fflush( f );
}
printf( "\tCartridge type byte changed to 0x01\n" );
}
else
printf( "\tCartridge type byte is OK\n" );
}
else
{
/* carttype byte can be anything? */
printf( "\tCartridge type byte is OK\n" );
}
/* Checksum */
fflush( f );
fseek( f, 0, SEEK_SET );
for( i=0; i<(0x8000L<<calcromsize); i+=1 )
{
ch=fgetc( f );
if( ch==EOF )
ch=0;
if( i<0x0134L )
calcchecksum+=ch;
else if( i<0x014DL )
{
calccompchecksum+=ch;
calcchecksum+=ch;
}
else if( i==0x014DL )
cartcompchecksum=ch;
else if( i==0x014EL )
cartchecksum=ch<<8;
else if( i==0x014FL )
cartchecksum|=ch;
else
calcchecksum+=ch;
}
calccompchecksum=0xE7-calccompchecksum;
calcchecksum+=calccompchecksum;
if( cartchecksum!=calcchecksum )
{
fflush( f );
fseek( f, 0x014EL, SEEK_SET );
if( (ulOptions&OPTF_DEBUG)==0 )
{
fputc( calcchecksum>>8, f );
fputc( calcchecksum&0xFF, f );
}
fflush( f );
printf( "\tChecksum changed from 0x%04lX to 0x%04lX\n", (long)cartchecksum, (long)calcchecksum );
}
else
printf( "\tChecksum is OK\n" );
if( cartcompchecksum!=calccompchecksum )
{
fflush( f );
fseek( f, 0x014DL, SEEK_SET );
if( (ulOptions&OPTF_DEBUG)==0 )
fputc( calccompchecksum, f );
fflush( f );
printf( "\tCompChecksum changed from 0x%02lX to 0x%02lX\n", (long)cartcompchecksum, (long)calccompchecksum );
}
else
printf( "\tCompChecksum is OK\n" );
}
fclose( f );
}
else
{
FatalError( "Unable to open file" );
}
return( 0 );
}