Show Posts
1
Mega Man Discussion / Re: Rockman 8 FC
« on: October 09, 2017, 12:16:14 AM »
I've made some progress trying to make this game moddable.
The game is coded in C++, so I used IDA to decompile the source code and reconstruct whatever bits I could.
As we all know, all images are stored into the image.bin file, but its contents are obfuscated and can't be ripped or re-encoded easily.
All i've found for now is that this is the function that loads the images from image.bin into memory:
If I read that correctly, the file is a simple data structure that needs to be serially decoded. Perhaps someone with debugging/hacking/programming skills can lend a hand?
The game is coded in C++, so I used IDA to decompile the source code and reconstruct whatever bits I could.
As we all know, all images are stored into the image.bin file, but its contents are obfuscated and can't be ripped or re-encoded easily.
All i've found for now is that this is the function that loads the images from image.bin into memory:
Code: [Select]
//----- (00403C50) --------------------------------------------------------
int __stdcall sub_403C50(int a1)
{
FILE binFile; // eax@1
FILE *binFilePtr; // edi@1
FILE *logFile; // esi@2
__int32 fileValue; // esi@4
void *binStructure; // ebx@4
int v6; // ecx@4
__int32 v7; // eax@4
int v8; // edx@5
int v9; // esi@10
int result; // eax@11
int v11; // [sp+10h] [bp-78h]@4
char v12; // [sp+18h] [bp-70h]@2
sub_4DC770(off_61AD48);
binFile = fopen("./image/image.bin", "r");
binFilePtr = binFile;
if ( !binFile )
{
logFile = fopen("dbg.txt", "a+");
sprintf(&v12, "[dbg] func_name:%s, line:%d\n", "Graphics::init_bmp", 919);
fputs(&v12, logFile);
fclose(logFile);
sub_4C2E00((int)binFilePtr);
exit_1((int)binFilePtr);
}
//starts reading image.bin at 0x02
//int fseek ( FILE * stream, long int offset, int origin );
fseek(binFile, 0, 2);
fileValue = ftell(binFilePtr);
fseek(binFilePtr, 0, 0);
binStructure = malloc(fileValue);
//size_t fread ( void * ptr, size_t size, size_t count, FILE * stream );
//Reads an array of count elements, each one with a size of size bytes, from the stream and stores them in the block of memory specified by ptr.
fread(binStructure, 1u, fileValue, binFilePtr);
v6 = 0;
v7 = 0;
v11 = 0;
if ( fileValue > 0 )
{
do
{
v8 = *((_BYTE *)binStructure + v7++);
v6 += v8;
}
while ( v7 < fileValue );
v11 = v6;
}
fclose(binFilePtr);
free(binStructure);
if ( v11 != 250926440 )
{
MessageBoxA(0, "invalid external files.", "Rockman8FC", 0);
sub_4C2E00((int)binFilePtr);
exit_1(0);
}
v9 = 0;
do
result = sub_401590(v9++, a1);
while ( v9 < 273 );
return result;
}If I read that correctly, the file is a simple data structure that needs to be serially decoded. Perhaps someone with debugging/hacking/programming skills can lend a hand?
