musix 0.3.3

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *   Mupen64plus - cart_rom.c                                              *
 *   Mupen64Plus homepage: http://code.google.com/p/mupen64plus/           *
 *   Copyright (C) 2014 Bobby Smiles                                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "usf/usf.h"

#include "usf/usf_internal.h"

#include "usf/barray.h"

#include "cart_rom.h"
#include "pi_controller.h"

void connect_cart_rom(struct cart_rom* cart_rom,
                      uint8_t* rom, size_t rom_size)
{
    cart_rom->rom = rom;
    cart_rom->rom_size = rom_size;
}

void init_cart_rom(struct cart_rom* cart_rom)
{
    cart_rom->last_write = 0;
}


int read_cart_rom(void* opaque, uint32_t address, uint32_t* value)
{
    struct pi_controller* pi = (struct pi_controller*)opaque;
    uint32_t addr = rom_address(address);

    if (pi->cart_rom.last_write != 0)
    {
        *value = pi->cart_rom.last_write;
        pi->cart_rom.last_write = 0;
    }
    else
    {
        *value = *(uint32_t*)(pi->cart_rom.rom + addr);
    }

    return 0;
}

int write_cart_rom(void* opaque, uint32_t address, uint32_t value, uint32_t mask)
{
    struct pi_controller* pi = (struct pi_controller*)opaque;
    pi->cart_rom.last_write = value & mask;

    return 0;
}


int read_cart_rom_tracked(void* opaque, uint32_t address, uint32_t* value)
{
    usf_state_t* state = (usf_state_t*)opaque;
    struct pi_controller* pi = &state->g_pi;
    uint32_t addr = rom_address(address);
    
    if (pi->cart_rom.last_write != 0)
    {
        *value = pi->cart_rom.last_write;
        pi->cart_rom.last_write = 0;
    }
    else
    {
        bit_array_set(state->barray_rom, addr / 4);
        
        *value = *(uint32_t*)(pi->cart_rom.rom + addr);
    }
    
    return 0;
}