59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
#pragma once
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#include <cstdint>
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#include <vector>
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#include <string>
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#include <fstream>
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#include "Memory.h"
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namespace EightBit {
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// ROM is a basic implementation of the Memory interface.
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// Nothing over and above the interface is exposed to users
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// of the ROM class.
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class Rom : public Memory {
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private:
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std::vector<uint8_t> m_bytes;
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protected:
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[[nodiscard]] constexpr const auto& BYTES() const noexcept { return m_bytes; }
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[[nodiscard]] constexpr auto& BYTES() noexcept { return m_bytes; }
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void poke(uint16_t address, uint8_t value) noexcept override;
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public:
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static int load(std::ifstream& file, std::vector<uint8_t>& output, int writeOffset = 0, int readOffset = 0, int limit = -1, int maximumSize = -1);
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static int load(std::string path, std::vector<uint8_t>& output, int writeOffset = 0, int readOffset = 0, int limit = -1, int maximumSize = -1);
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Rom(size_t size = 0) noexcept;
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Rom(const Rom& rhs);
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virtual ~Rom() = default;
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Rom& operator=(const Rom& rhs);
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bool operator==(const Rom& rhs) const;
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[[nodiscard]] uint16_t size() const noexcept final;
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int load(std::ifstream& file, int writeOffset = 0, int readOffset = 0, int limit = -1) final;
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int load(std::string path, int writeOffset = 0, int readOffset = 0, int limit = -1) final;
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int load(const std::vector<uint8_t>& bytes, int writeOffset = 0, int readOffset = 0, int limit = -1) final;
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template <typename Iter>
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int load(Iter start, Iter end, int writeOffset = 0, int readOffset = 0, int limit = -1) {
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const auto size = end - start;
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if (limit < 0)
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limit = static_cast<int>(size) - readOffset;
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const size_t extent = static_cast<size_t>(limit) + writeOffset;
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if (m_bytes.size() < extent)
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m_bytes.resize(extent);
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std::copy(start + readOffset, start + readOffset + limit, m_bytes.begin() + writeOffset);
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return limit;
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}
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[[nodiscard]] uint8_t peek(uint16_t address) const noexcept final;
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};
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}
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