diff options
Diffstat (limited to 'lib/nes/sys/cartridge.cc')
| -rw-r--r-- | lib/nes/sys/cartridge.cc | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/lib/nes/sys/cartridge.cc b/lib/nes/sys/cartridge.cc index fcb7e84..14fff3d 100644 --- a/lib/nes/sys/cartridge.cc +++ b/lib/nes/sys/cartridge.cc @@ -5,15 +5,13 @@ namespace nes::sys { - cartridge::cartridge(u8 const* data, u32 const length) + cartridge::cartridge(span<u8 const> const data) { // See: https://www.nesdev.org/wiki/INES - auto const bytes = static_cast<u8 const*>(data); - // Parse header. - if (length < header_length) { return; } - auto const h = header{ bytes }; + if (data.get_length() < header_length) { return; } + auto const h = header{ data.subspan<header_length>(0) }; if (h.get_magic_0() != 'N' || h.get_magic_1() != 'E' || h.get_magic_2() != 'S' || h.get_magic_3() != 0x1A) { return; @@ -28,16 +26,16 @@ namespace nes::sys if (h.get_has_trainer()) { offset += 512; } prg_rom_size_ = h.get_prg_rom_banks() * prg_rom_bank_size; - if (length < offset + prg_rom_size_) { return; } + if (data.get_length() < offset + prg_rom_size_) { return; } if (prg_rom_size_ > max_prg_rom_size) { return; } - std::copy_n(&bytes[offset], prg_rom_size_, prg_rom_); + std::copy_n(&data[offset], prg_rom_size_, prg_rom_); offset += prg_rom_size_; chr_rom_size_ = h.get_chr_rom_banks() * chr_rom_bank_size; - if (length < offset + chr_rom_size_) { return; } + if (data.get_length() < offset + chr_rom_size_) { return; } if (chr_rom_size_ > max_chr_rom_size) { return; } - std::copy_n(&bytes[offset], chr_rom_size_, chr_rom_); + std::copy_n(&data[offset], chr_rom_size_, chr_rom_); ram_size_ = std::max(h.get_ram_banks(), 1u) * ram_bank_size; if (ram_size_ > max_ram_size) { return; } |