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