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#pragma once
#include "nes/sys/mapper.hh"
#include "nes/common/containers/span.hh"
#include "nes/common/status.hh"
#include "nes/common/types.hh"
namespace nes::sys
{
enum class name_table_arrangement
{
horizontal,
vertical,
};
class cartridge
{
static constexpr auto prg_rom_bank_size = u32{ 16 * 1024 };
static constexpr auto chr_rom_bank_size = u32{ 8 * 1024 };
static constexpr auto ram_bank_size = u32{ 8 * 1024 };
static constexpr auto max_prg_rom_size = u32{ 4 * prg_rom_bank_size };
static constexpr auto max_chr_rom_size = u32{ 4 * chr_rom_bank_size };
static constexpr auto max_ram_size = u32{ 4 * ram_bank_size };
static constexpr auto header_length = u32{ 16 };
struct header
{
auto get_magic_0() const -> u8 { return value[0]; }
auto get_magic_1() const -> u8 { return value[1]; }
auto get_magic_2() const -> u8 { return value[2]; }
auto get_magic_3() const -> u8 { return value[3]; }
auto get_prg_rom_banks() const -> u32 { return value[4]; }
auto get_chr_rom_banks() const -> u32 { return value[5]; }
auto get_control_1() const -> u8 { return value[6]; }
auto get_control_2() const -> u8 { return value[7]; }
auto get_ram_banks() const -> u32 { return value[8]; }
auto get_has_trainer() const -> bool { return get_control_1() & 0b00000100; }
auto get_mapper_low() const -> u32 { return (get_control_1() & 0b11110000) >> 4; }
auto get_mapper_high() const -> u32 { return (get_control_2() & 0b11110000) >> 0; }
auto get_name_table_arrangement() const -> name_table_arrangement { return static_cast<name_table_arrangement>((get_control_1() & 0b00000001) >> 0); }
u8 value[header_length]{};
explicit header(span<u8 const, header_length> const v)
{
for (auto i = u32{ 0 }; i < header_length; ++i)
{
value[i] = v[i];
}
}
};
status status_{ status::error_invalid_ines_data };
u8 prg_rom_[max_prg_rom_size]{};
u8 chr_rom_[max_chr_rom_size]{};
u8 ram_[max_ram_size]{};
u32 prg_rom_size_{};
u32 chr_rom_size_{};
u32 ram_size_{};
name_table_arrangement name_table_arrangement_{};
mapper* mapper_{ &mapper::invalid() };
public:
static constexpr auto max_file_size = u32{ max_prg_rom_size + max_chr_rom_size + 512 + header_length };
explicit cartridge(span<u8 const>);
auto get_status() const -> status { return status_; }
auto get_prg_rom() const -> span<u8 const> { return span{ prg_rom_, prg_rom_size_ }; }
auto get_chr_rom() const -> span<u8 const> { return span{ chr_rom_, chr_rom_size_ }; }
auto get_ram() const -> span<u8 const> { return span{ ram_, ram_size_ }; }
auto ref_ram() -> span<u8> { return span{ ram_, ram_size_ }; }
auto get_mapper() const -> mapper& { return *mapper_; }
auto get_name_table_arrangement() const -> name_table_arrangement { return name_table_arrangement_; }
};
} // namespace nes::sys
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