blargg_err_t Nes_Cart::load_ines( Auto_File_Reader in )
{
RETURN_ERR( in.open() );
ines_header_t h;
RETURN_ERR( in->read( &h, sizeof h ) );
if ( 0 != memcmp( h.signature, "NES\x1A", 4 ) )
return not_ines_file;
if ( h.zero [7] ) // handle header defaced by a f*****g idiot's handle
h.flags2 = 0;
set_mapper( h.flags, h.flags2 );
if ( h.flags & 0x04 ) // skip trainer
RETURN_ERR( in->skip( 512 ) );
RETURN_ERR( resize_prg( h.prg_count * 16 * 1024L ) );
RETURN_ERR( resize_chr( h.chr_count * 8 * 1024L ) );
RETURN_ERR( in->read( prg(), prg_size() ) );
RETURN_ERR( in->read( chr(), chr_size() ) );
return 0;
}
blargg_err_t Nes_Cart::load_patched_ines( Auto_File_Reader in, Auto_File_Reader patch )
{
RETURN_ERR( in.open() );
RETURN_ERR( patch.open() );
// read file into memory
long size = in->remain();
byte* ines = (byte*) malloc( size );
CHECK_ALLOC( ines );
const char* err = in->read( ines, size );
// apply patch
if ( !err )
err = apply_ips_patch( *patch, &ines, &size );
// load patched file
if ( !err )
{
Mem_File_Reader patched( ines, size );
err = load_ines( patched );
}
free( ines );
return err;
}
blargg_err_t Nes_Cart::apply_ips_to_chr( Auto_File_Reader patch )
{
RETURN_ERR( patch.open() );
long size = chr_size();
byte* chr_copy = (byte*) malloc( size );
CHECK_ALLOC( chr_copy );
memcpy( chr_copy, chr(), size );
const char* err = apply_ips_patch( *patch, &chr_copy, &size );
if ( !err )
{
resize_chr( size );
memcpy( chr(), chr_copy, size );
}
free( chr_copy );
return err;
}
blargg_err_t Nes_Emu::load_battery_ram( Auto_File_Reader in )
{
RETURN_ERR( in.open() );
emu.sram_present = true;
return in->read( emu.impl->sram, emu.impl->sram_size );
}