69 lines
2 KiB
C
69 lines
2 KiB
C
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// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/
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#include "rom_data.h"
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/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <string.h>
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#include "blargg_source.h"
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// Rom_Data
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blargg_err_t Rom_load( struct Rom_Data* this, const void* data, long size,
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int header_size, void* header_out, int fill )
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{
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long file_offset = this->pad_size;
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this->rom_addr = 0;
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this->mask = 0;
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this->size = 0;
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if ( size <= header_size ) // <= because there must be data after header
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return gme_wrong_file_type;
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// Read header
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memcpy( header_out, data, header_size );
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this->file_size = size - header_size;
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this->file_data = (byte*) data + header_size;
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memset( this->unmapped, fill, this->rom_size );
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memcpy( &this->unmapped [file_offset], this->file_data,
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this->file_size < this->pad_size ? this->file_size : this->pad_size );
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return 0;
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}
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void Rom_set_addr( struct Rom_Data* this, long addr )
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{
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this->rom_addr = addr - this->bank_size - pad_extra;
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long rounded = (addr + this->file_size + this->bank_size - 1) / this->bank_size * this->bank_size;
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if ( rounded <= 0 )
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{
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rounded = 0;
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}
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else
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{
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int shift = 0;
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unsigned long max_addr = (unsigned long) (rounded - 1);
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while ( max_addr >> shift )
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shift++;
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this->mask = (1L << shift) - 1;
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}
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if ( addr < 0 )
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addr = 0;
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this->size = rounded;
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this->rsize_ = rounded - this->rom_addr + pad_extra;
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}
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