89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-20 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "nvram.h"
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#include <cinttypes>
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#include <cstring>
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#include <fstream>
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#include <iostream>
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#include <thirdparty/loguru/loguru.hpp>
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/** @file Non-volatile RAM implementation.
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*/
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using namespace std;
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/** the signature for NVRAM backing file identification. */
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static char NVRAM_FILE_ID[] = "DINGUSPPCNVRAM";
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NVram::NVram(std::string file_name, uint32_t ram_size) {
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this->file_name = file_name;
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this->ram_size = ram_size;
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this->storage = new uint8_t[ram_size];
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this->init();
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}
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NVram::~NVram() {
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this->save();
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if (this->storage)
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delete this->storage;
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}
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uint8_t NVram::read_byte(uint32_t offset) {
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return (this->storage[offset]);
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}
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void NVram::write_byte(uint32_t offset, uint8_t val) {
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this->storage[offset] = val;
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}
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void NVram::init() {
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char sig[sizeof(NVRAM_FILE_ID)];
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uint16_t data_size;
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ifstream f(this->file_name, ios::in | ios::binary);
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if (f.fail() || !f.read(sig, sizeof(NVRAM_FILE_ID)) ||
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!f.read((char*)&data_size, sizeof(data_size)) ||
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memcmp(sig, NVRAM_FILE_ID, sizeof(NVRAM_FILE_ID)) || data_size != this->ram_size ||
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!f.read((char*)this->storage, this->ram_size)) {
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LOG_F(WARNING, "Could not restore NVRAM content from the given file. \n");
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memset(this->storage, 0, sizeof(this->ram_size));
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}
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f.close();
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}
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void NVram::save() {
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ofstream f(this->file_name, ios::out | ios::binary);
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/* write file identification */
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f.write(NVRAM_FILE_ID, sizeof(NVRAM_FILE_ID));
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f.write((char*)&this->ram_size, sizeof(this->ram_size));
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/* write NVRAM content */
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f.write((char*)this->storage, this->ram_size);
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f.close();
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}
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