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CLK/Storage/Cartridge/Formats/PRG.cpp

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//
// PRG.cpp
// Clock Signal
//
// Created by Thomas Harte on 27/08/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#include "PRG.hpp"
#include <cstdio>
#include <sys/stat.h>
#include "../Encodings/CommodoreROM.hpp"
using namespace Storage::Cartridge;
PRG::PRG(const std::string &file_name) {
struct stat file_stats;
stat(file_name.c_str(), &file_stats);
// accept only files sized less than 8kb
if(file_stats.st_size > 0x2000 + 2)
throw ErrorNotROM;
// get the loading address, and the rest of the contents
FILE *file = std::fopen(file_name.c_str(), "rb");
int loading_address = fgetc(file);
loading_address |= fgetc(file) << 8;
std::size_t data_length = size_t(file_stats.st_size) - 2;
std::size_t padded_data_length = 1;
while(padded_data_length < data_length) padded_data_length <<= 1;
std::vector<uint8_t> contents(padded_data_length);
std::size_t length = std::fread(contents.data(), 1, size_t(data_length), file);
std::fclose(file);
// accept only files intended to load at 0xa000
if(loading_address != 0xa000 || length != size_t(data_length))
throw ErrorNotROM;
// also accept only cartridges with the proper signature
if(!Storage::Cartridge::Encodings::CommodoreROM::isROM(contents))
throw ErrorNotROM;
segments_.emplace_back(0xa000, 0xa000 + data_length, std::move(contents));
}