13cbade08a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30397 a1c6a512-1295-4272-9138-f99709370657
68 lines
2 KiB
C
68 lines
2 KiB
C
// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
|
|
|
|
#include "rom_data.h"
|
|
|
|
/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
|
|
can redistribute it and/or modify it under the terms of the GNU Lesser
|
|
General Public License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version. This
|
|
module 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 Lesser General Public License for more
|
|
details. You should have received a copy of the GNU Lesser General Public
|
|
License along with this module; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
|
|
#include <string.h>
|
|
#include "blargg_source.h"
|
|
|
|
// Rom_Data
|
|
|
|
blargg_err_t Rom_load( struct Rom_Data* this, const void* data, long size,
|
|
int header_size, void* header_out, int fill )
|
|
{
|
|
int file_offset = this->pad_size;
|
|
|
|
this->rom_addr = 0;
|
|
this->mask = 0;
|
|
this->size = 0;
|
|
|
|
if ( size <= header_size ) // <= because there must be data after header
|
|
return gme_wrong_file_type;
|
|
|
|
// Read header
|
|
memcpy( header_out, data, header_size );
|
|
|
|
this->file_size = size - header_size;
|
|
this->file_data = (byte*) data + header_size;
|
|
|
|
memset( this->unmapped, fill, this->rom_size );
|
|
memcpy( &this->unmapped [file_offset], this->file_data,
|
|
this->file_size < this->pad_size ? this->file_size : this->pad_size );
|
|
|
|
return 0;
|
|
}
|
|
|
|
void Rom_set_addr( struct Rom_Data* this, int addr )
|
|
{
|
|
this->rom_addr = addr - this->bank_size - pad_extra;
|
|
|
|
int rounded = (addr + this->file_size + this->bank_size - 1) / this->bank_size * this->bank_size;
|
|
if ( rounded <= 0 )
|
|
{
|
|
rounded = 0;
|
|
}
|
|
else
|
|
{
|
|
int shift = 0;
|
|
unsigned int max_addr = (unsigned int) (rounded - 1);
|
|
while ( max_addr >> shift )
|
|
shift++;
|
|
this->mask = (1L << shift) - 1;
|
|
}
|
|
|
|
if ( addr < 0 )
|
|
addr = 0;
|
|
this->size = rounded;
|
|
this->rsize_ = rounded - this->rom_addr + pad_extra;
|
|
}
|