oss/RomPatcher.js
oss/RomPatcher.js
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settings: automatic GB/C and Mega Drive/Genesis ROM header fix

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Marc Robledo 2022-11-10 19:09:53 +01:00
parent df48e4679c
commit 0709addaf9
4 changed files with 112 additions and 10 deletions
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107
js/RomPatcher.js
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@ -1,4 +1,4 @@
/* Rom Patcher JS v20220319 - Marc Robledo 2016-2022 - http://www.marcrobledo.com/license */
/* Rom Patcher JS v20221110 - Marc Robledo 2016-2022 - http://www.marcrobledo.com/license */
const TOO_BIG_ROM_SIZE=67108863;
const HEADERS_INFO=[
@ -246,6 +246,7 @@ var UI={
var AppSettings={
langCode:(typeof navigator.userLanguage==='string')? navigator.userLanguage.substr(0,2) : 'en',
outputFileNameMatch:false,
fixChecksum:false,
lightTheme:false,
load:function(){
@ -261,6 +262,10 @@ var AppSettings={
this.outputFileNameMatch=loadedSettings.outputFileNameMatch;
el('switch-output-name').className='switch enabled';
}
if(loadedSettings.fixChecksum===true){
this.fixChecksum=loadedSettings.fixChecksum;
el('switch-fix-checksum').className='switch enabled';
}
if(loadedSettings.lightTheme===true){
this.lightTheme=loadedSettings.lightTheme;
el('switch-theme').className='switch enabled';
@ -429,6 +434,16 @@ addEvent(window,'load',function(){
}
AppSettings.save();
});
addEvent(el('switch-fix-checksum'), 'click', function(){
if(this.className==='switch enabled'){
this.className='switch disabled';
AppSettings.fixChecksum=false;
}else{
this.className='switch enabled';
AppSettings.fixChecksum=true;
}
AppSettings.save();
});
addEvent(el('switch-theme'), 'click', function(){
if(this.className==='switch enabled'){
this.className='switch disabled';
@ -557,6 +572,82 @@ function validateSource(){
function _getRomSystem(file){
if(file.fileSize>0x0200 && file.fileSize%4===0){
if(/\.gbc?/i.test(file.fileName)){
var NINTENDO_LOGO=[
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
];
file.offset=0x104;
var valid=true;
for(var i=0; i<NINTENDO_LOGO.length && valid; i++){
if(NINTENDO_LOGO[i]!==file.readU8())
valid=false;
}
if(valid)
return 'gb';
}else if(/\.(bin|md)?/i.test(file.fileName)){
file.offset=0x0100;
if(/SEGA (GENESIS|MEGA DR)/.test(file.readString(12)))
return 'smd';
}
}
return null;
}
function _getHeaderChecksumInfo(file){
var info={
system:_getRomSystem(file),
current:null,
calculated:null,
fix:null
}
if(info.system==='gb'){
/* get current checksum */
file.offset=0x014d;
info.current=file.readU8();
/* calculate checksum */
info.calculated=0x00;
file.offset=0x0134;
for(var i=0; i<=0x18; i++){
info.calculated=((info.calculated - file.readU8() - 1) >>> 0) & 0xff;
}
/* fix checksum */
info.fix=function(file){
file.offset=0x014d;
file.writeU8(this.calculated);
}
}else if(info.system==='smd'){
/* get current checksum */
file.offset=0x018e;
info.current=file.readU16();
/* calculate checksum */
info.calculated=0x0000;
file.offset=0x0200;
while(!file.isEOF()){
info.calculated=((info.calculated + file.readU16()) >>> 0) & 0xffff;
}
/* fix checksum */
info.fix=function(file){
file.offset=0x018e;
file.writeU16(this.calculated);
}
}else{
info=null;
}
return info;
}
function _readPatchFile(){
setTabApplyEnabled(false);
patchFile.littleEndian=false;
@ -622,18 +713,18 @@ function preparePatchedRom(originalRom, patchedRom, headerSize){
/* fix checksum if needed */
//var fixedChecksum=fixConsoleChecksum(patchedRom);
if(AppSettings.fixChecksum){
var checksumInfo=_getHeaderChecksumInfo(patchedRom);
if(checksumInfo && checksumInfo.current!==checksumInfo.calculated && confirm(_('fix_checksum_prompt')+' ('+padZeroes(checksumInfo.current)+' -> '+padZeroes(checksumInfo.calculated)+')')){
checksumInfo.fix(patchedRom);
}
}
setMessage('apply');
patchedRom.save();
/*if(fixedChecksum){
setMessage('apply','Checksum was fixed','warning');
}*/
//debug: create unheadered patch
/*if(headerSize && el('checkbox-addheader').checked){
@ -642,6 +733,8 @@ function preparePatchedRom(originalRom, patchedRom, headerSize){
}
/*function removeHeader(romFile){
//r._dataView=new DataView(r._dataView.buffer, headerSize);
oldHeader=romFile.slice(0,headerSize);