/*
"$Id: gbafix.c,v 1.2 2008-07-30 17:12:51 wntrmute Exp $"
DevkitPro GBA ROM fix utility
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
Please report all bugs and problems through the bug tracker at
"http://sourceforge.net/tracker/?group_id=114505&atid=668551".
"$Header: /lvm/shared/ds/ds/cvs/devkitpro-cvsbackup/tools/gba/gbatools/gbafix.c,v 1.2 2008-07-30 17:12:51 wntrmute Exp $"
*/
//---------------------------------------------------------------------------------
// gbafix.c
//---------------------------------------------------------------------------------
/*
Gameboy Advance ROM fixer (by Dark Fader / BlackThunder / WinterMute / Diegoisawesome)
Validates header of GBA roms.
History
-------
v1.06 - added output silencing, (Diegoisawesome)
v1.05 - added debug offset argument, (Diegoisawesome)
v1.04 - converted to plain C, (WinterMute)
v1.03 - header.fixed, header.device_type
v1.02 - redefined the options (rgbfix style), checksum=0
v1.01 - fix in parameters
v1.00 - logo, complement
*/
#pragma pack(1)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define VER "1.06"
#define ARGV argv[arg]
#define VALUE (ARGV+2)
#define NUMBER strtoul(VALUE, NULL, 0)
typedef struct
{
uint32_t start_code; // B instruction
uint8_t logo[0xA0-0x04]; // logo data
uint8_t title[0xC]; // game title name
uint32_t game_code; //
uint16_t maker_code; //
uint8_t fixed; // 0x96
uint8_t unit_code; // 0x00
uint8_t device_type; // 0x00
uint8_t unused[7]; //
uint8_t game_version; // 0x00
uint8_t complement; // 800000A0..800000BC
uint16_t checksum; // 0x0000
} Header;
Header header;
unsigned short checksum_without_header = 0;
const Header good_header =
{
// start_code
0xEA00002E,
// logo
{ 0x24,0xFF,0xAE,0x51,0x69,0x9A,0xA2,0x21,0x3D,0x84,0x82,0x0A,0x84,0xE4,0x09,0xAD,
0x11,0x24,0x8B,0x98,0xC0,0x81,0x7F,0x21,0xA3,0x52,0xBE,0x19,0x93,0x09,0xCE,0x20,
0x10,0x46,0x4A,0x4A,0xF8,0x27,0x31,0xEC,0x58,0xC7,0xE8,0x33,0x82,0xE3,0xCE,0xBF,
0x85,0xF4,0xDF,0x94,0xCE,0x4B,0x09,0xC1,0x94,0x56,0x8A,0xC0,0x13,0x72,0xA7,0xFC,
0x9F,0x84,0x4D,0x73,0xA3,0xCA,0x9A,0x61,0x58,0x97,0xA3,0x27,0xFC,0x03,0x98,0x76,
0x23,0x1D,0xC7,0x61,0x03,0x04,0xAE,0x56,0xBF,0x38,0x84,0x00,0x40,0xA7,0x0E,0xFD,
0xFF,0x52,0xFE,0x03,0x6F,0x95,0x30,0xF1,0x97,0xFB,0xC0,0x85,0x60,0xD6,0x80,0x25,
0xA9,0x63,0xBE,0x03,0x01,0x4E,0x38,0xE2,0xF9,0xA2,0x34,0xFF,0xBB,0x3E,0x03,0x44,
0x78,0x00,0x90,0xCB,0x88,0x11,0x3A,0x94,0x65,0xC0,0x7C,0x63,0x87,0xF0,0x3C,0xAF,
0xD6,0x25,0xE4,0x8B,0x38,0x0A,0xAC,0x72,0x21,0xD4,0xF8,0x07 } ,
// title
{ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
// game code
0x00000000,
// maker code
0x3130,
// fixed
0x96,
// unit_code
0x00,
// device type
0x00,
// unused
{ 0x00,0x00,0x00,0x00,0x00,0x00,0x00 },
// game version
0x00,
// complement
0x00,
// checksum
0x0000
};
//---------------------------------------------------------------------------------
char HeaderComplement()
/*---------------------------------------------------------------------------------
Calculate Header complement check
---------------------------------------------------------------------------------*/
{
int n;
char c = 0;
char *p = (char *)&header + 0xA0;
for (n=0; n<0xBD-0xA0; n++)
{
c += *p++;
}
return -(0x19+c);
}
//---------------------------------------------------------------------------------
int main(int argc, char *argv[])
//---------------------------------------------------------------------------------
{
int arg;
char *argfile = 0;
FILE *infile;
int silent = 0;
int size,bit;
// show syntax
if (argc <= 1)
{
printf("GBA ROM fixer v"VER" by Dark Fader / BlackThunder / WinterMute / Diegoisawesome \n");
printf("Syntax: gbafix <rom.gba> [-p] [-t[title]] [-c<game_code>] [-m<maker_code>] [-r<version>] [-d<debug>] [--silent]\n");
printf("\n");
printf("parameters:\n");
printf(" -p Pad to next exact power of 2. No minimum size!\n");
printf(" -t[<title>] Patch title. Stripped filename if none given.\n");
printf(" -c<game_code> Patch game code (four characters)\n");
printf(" -m<maker_code> Patch maker code (two characters)\n");
printf(" -r<version> Patch game version (number)\n");
printf(" -d<debug> Enable debugging handler and set debug entry point (0 or 1)\n");
printf(" --silent Silence non-error output\n");
return -1;
}
// get filename
for (arg=1; arg<argc; arg++)
{
if ((ARGV[0] != '-')) { argfile=ARGV; }
if (strncmp("--silent", &ARGV[0], 7) == 0) { silent = 1; }
}
// check filename
if (!argfile)
{
fprintf(stderr, "Filename needed!\n");
return -1;
}
// read file
infile = fopen(argfile, "r+b");
if (!infile) { fprintf(stderr, "Error opening input file!\n"); return -1; }
fseek(infile, 0, SEEK_SET);
fread(&header, sizeof(header), 1, infile);
// fix some data
memcpy(header.logo, good_header.logo, sizeof(header.logo));
memcpy(&header.fixed, &good_header.fixed, sizeof(header.fixed));
memcpy(&header.device_type, &good_header.device_type, sizeof(header.device_type));
// parse command line
for (arg=1; arg<argc; arg++)
{
if ((ARGV[0] == '-'))
{
switch (ARGV[1])
{
case 'p': // pad
{
fseek(infile, 0, SEEK_END);
size = ftell(infile);
for (bit=31; bit>=0; bit--) if (size & (1<<bit)) break;
if (size != (1<<bit))
{
int todo = (1<<(bit+1)) - size;
while (todo--) fputc(0xFF, infile);
}
fseek(infile, 0, SEEK_SET);
break;
}
case 't': // title
{
char title[256];
memset(title, 0, sizeof(title));
if (VALUE[0])
{
strncpy(title, VALUE, sizeof(header.title));
}
else
{
// use filename
char s[256], *begin=s, *t; strcpy(s, argfile);
t = strrchr(s, '\\'); if (t) begin = t+1;
t = strrchr(s, '/'); if (t) begin = t+1;
t = strrchr(s, '.'); if (t) *t = 0;
strncpy(title, begin, sizeof(header.title));
if (!silent) printf("%s\n",begin);
}
memcpy(header.title, title, sizeof(header.title)); // copy
break;
}
case 'c': // game code
{
//if (!VALUE[0]) { fprintf(stderr, "Need value for %s\n", ARGV); break; }
//header.game_code = NUMBER;
header.game_code = VALUE[0] | VALUE[1]<<8 | VALUE[2]<<16 | VALUE[3]<<24;
break;
}
case 'm': // maker code
{
//if (!VALUE[0]) { fprintf(stderr, "Need value for %s\n", ARGV); break; }
//header.maker_code = (unsigned short)NUMBER;
header.maker_code = VALUE[0] | VALUE[1]<<8;
break;
}
case 'v': // ignored, compatability with other gbafix
{
break;
}
case 'r': // version
{
if (!VALUE[0]) { fprintf(stderr, "Need value for %s\n", ARGV); break; }
header.game_version = (unsigned char)NUMBER;
break;
}
case 'd': // debug
{
if (!VALUE[0]) { fprintf(stderr, "Need value for %s\n", ARGV); break; }
header.logo[0x9C-0x04] = 0xA5; // debug enable
header.device_type = (unsigned char)((NUMBER & 1) << 7); // debug handler entry point
break;
}
case '-': // long arguments
{
if (strncmp("silent", &ARGV[2], 6) == 0) { continue; }
break;
}
default:
{
printf("Invalid option: %s\n", ARGV);
}
}
}
}
// update complement check & total checksum
header.complement = 0;
header.checksum = 0; // must be 0
header.complement = HeaderComplement();
//header.checksum = checksum_without_header + HeaderChecksum();
fseek(infile, 0, SEEK_SET);
fwrite(&header, sizeof(header), 1, infile);
fclose(infile);
if (!silent) printf("ROM fixed!\n");
return 0;
}