commit 1b84092191274feb06f6ea20b42dc283cf2ea3e6 · baileytownsend.dev/DMG-Playground

+124

src/cartridge_header.rs

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       use crate::NINTENDO_LOGO;

     

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       use crate::enums::{

     

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           CGBFlag, CartridgeHeaderAddress, CartridgeType, DestinationCode, Error, RamSize, RomSize,

     

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       };

     

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       pub struct CartridgeHeader {

     

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           //Should be 80 bytes (0x014F(335) - 0x0100(256)) + 1 to include the last address

     

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           pub buffer: [u8; 80],

     

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           pub title: [char; 16],

     

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           pub manufacturer_code: [char; 4],

     

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           pub cgb_flag: CGBFlag,

     

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           // https://gbdev.io/pandocs/The_Cartridge_Header.html#01440145--new-licensee-code

     

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           pub license_code: [char; 2],

     

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           pub support_gb: bool,

     

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           pub cart_type: CartridgeType,

     

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           pub rom_size: RomSize,

     

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           pub ram_size: RamSize,

     

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           // If None uses new license code which is just license_code

     

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           // https://gbdev.io/pandocs/The_Cartridge_Header.html#014b--old-licensee-code

     

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           pub old_licensee_code: Option<u8>,

     

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           pub destination_code: DestinationCode,

     

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           pub version: u8,

     

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           pub header_checksum: u8,

     

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           pub global_checksum: u16,

     

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       }

     

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       impl CartridgeHeader {

     

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           fn bytes_to_chars<const N: usize>(bytes: &[u8], break_on_null: bool) -> [char; N] {

     

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               let mut chars = [0x000 as char; N];

     

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               for (i, byte) in bytes.iter().enumerate() {

     

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                   if break_on_null && *byte == 0x00 {

     

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                       break;

     

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                   }

     

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                   chars[i] = *byte as char;

     

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               }

     

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               chars

     

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           }

     

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           pub fn parse(rom_bytes: &[u8]) -> Result<Self, Error> {

     

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               let start = CartridgeHeaderAddress::CartridgeHeaderStart as usize;

     

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               let end = start + 80;

     

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               let header_buffer: &[u8] = rom_bytes[start..end]

     

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                   .try_into()

     

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                   .map_err(|_| Error::CartridgeReadError)?;

     

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               //Checks if the Nintendo logo matches the device's version. Early anti piracy feature. Neat to take note of

     

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               let nintendo_logo_from_rom = &rom_bytes[CartridgeHeaderAddress::NintendoLogoStart as usize

     

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                   ..CartridgeHeaderAddress::NintendoLogoEnd as usize + 1];

     

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               for (i, true_logo_byte) in NINTENDO_LOGO.iter().enumerate() {

     

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                   let rom_byte = nintendo_logo_from_rom[i];

     

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                   if rom_byte != *true_logo_byte {

     

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                       return Err(Error::CartridgeReadError);

     

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                   }

     

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               }

     

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               let title = &rom_bytes[CartridgeHeaderAddress::TitleStart as usize

     

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                   ..CartridgeHeaderAddress::TitleEnd as usize + 1];

     

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               let title_chars = Self::bytes_to_chars::<16>(title, true);

     

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               let manufacturer_code = &rom_bytes[CartridgeHeaderAddress::ManufacturerCodeStart as usize

     

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                   ..CartridgeHeaderAddress::ManufacturerCodeEnd as usize + 1];

     

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               let man_code_chars = Self::bytes_to_chars::<4>(manufacturer_code, false);

     

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               let cgb_flag_byte = rom_bytes[0x0143];

     

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               let cgb_flag = match cgb_flag_byte {

     

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                   0x80 => CGBFlag::SupportsColorBackwardCompatiable,

     

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                   0xC0 => CGBFlag::ColorOnly,

     

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                   _ => CGBFlag::NotSet,

     

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               };

     

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               let license_code = &rom_bytes[CartridgeHeaderAddress::NewLicenseStart as usize

     

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                   ..CartridgeHeaderAddress::NewLicenseEnd as usize + 1];

     

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               let license_code_chars = Self::bytes_to_chars::<2>(license_code, false);

     

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               // https://gbdev.io/pandocs/The_Cartridge_Header.html#0146--sgb-flag

     

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               let sgb_flag = rom_bytes[CartridgeHeaderAddress::SgbFlag as usize] == 0x03;

     

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               let cart_type =

     

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                   CartridgeType::from_byte(rom_bytes[CartridgeHeaderAddress::CartType as usize]);

     

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               let rom_size = RomSize::from_byte(rom_bytes[CartridgeHeaderAddress::RomSize as usize]);

     

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               let ram_size = RamSize::from_byte(rom_bytes[CartridgeHeaderAddress::RamSize as usize]);

     

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               let mut old_licensee_code = None;

     

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               if !sgb_flag {

     

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                   old_licensee_code = Some(rom_bytes[CartridgeHeaderAddress::OldLicenseeCode as usize])

     

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               }

     

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               let destination_code =

     

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                   DestinationCode::from_byte(rom_bytes[CartridgeHeaderAddress::DestinationCode as usize]);

     

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               let version = rom_bytes[CartridgeHeaderAddress::MaskRomVersion as usize];

     

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               let header_checksum = rom_bytes[CartridgeHeaderAddress::HeaderChecksum as usize];

     

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               let global_checksum = u16::from_le_bytes([

     

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                   rom_bytes[CartridgeHeaderAddress::GlobalChecksumStart as usize],

     

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                   rom_bytes[CartridgeHeaderAddress::CartridgeHeaderEnd as usize],

     

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               ]);

     

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               Ok(Self {

     

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                   buffer: header_buffer

     

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                       .try_into()

     

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                       .map_err(|_| Error::CartridgeReadError)?,

     

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                   title: title_chars,

     

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                   manufacturer_code: man_code_chars,

     

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                   cgb_flag,

     

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                   license_code: license_code_chars,

     

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                   support_gb: sgb_flag,

     

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                   cart_type,

     

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                   rom_size,

     

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                   ram_size,

     

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                   old_licensee_code,

     

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                   destination_code,

     

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                   version,

     

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                   header_checksum,

     

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                   global_checksum,

     

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               })

     

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           }

     

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           fn print_test(&self) {

     

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               for byte in self.buffer.iter() {

     

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                   print!("{} ", *byte as char);

     

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               }

     

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           }

     

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       }

+2 -118

src/main.rs

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       mod cartridge_header;

     

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       mod enums;

     

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       use crate::cartridge_header::CartridgeHeader;

     

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       use crate::enums::CartridgeHeaderAddress::OldLicenseeCode;

     

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       use crate::enums::{

     

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           CGBFlag, CartridgeHeaderAddress, CartridgeType, DestinationCode, Error, RamSize, RomSize,

     
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       // const ROM_NAME: &str = "OtherLegallyObtainedRom.gb";

     

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       const ROM_NAME: &str = "LegallyObtainedRom.gb";

     

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       struct CartridgeHeader {

     

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           //Should be 80 bytes (0x014F(335) - 0x0100(256)) + 1 to include the last address

     

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           buffer: [u8; 80],

     

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           title: [char; 16],

     

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           manufacturer_code: [char; 4],

     

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           cgb_flag: CGBFlag,

     

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           // https://gbdev.io/pandocs/The_Cartridge_Header.html#01440145--new-licensee-code

     

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           license_code: [char; 2],

     

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           support_gb: bool,

     

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           cart_type: CartridgeType,

     

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           rom_size: RomSize,

     

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           ram_size: RamSize,

     

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           old_licensee_code: Option<u8>,

     

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           destination_code: DestinationCode,

     

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           version: u8,

     

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           header_checksum: u8,

     

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           global_checksum: u16,

     

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       }

     

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       impl CartridgeHeader {

     

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           fn bytes_to_chars<const N: usize>(bytes: &[u8], break_on_null: bool) -> [char; N] {

     

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               let mut chars = [0x000 as char; N];

     

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               for (i, byte) in bytes.iter().enumerate() {

     

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                   if break_on_null && *byte == 0x00 {

     

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                       break;

     

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                   }

     

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                   chars[i] = *byte as char;

     

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               }

     

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               chars

     

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           }

     

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           fn parse(rom_bytes: &[u8]) -> Result<Self, Error> {

     

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               let start = CartridgeHeaderAddress::CartridgeHeaderStart as usize;

     

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               let end = start + 80;

     

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               let header_buffer: &[u8] = rom_bytes[start..end]

     

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                   .try_into()

     

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                   .map_err(|_| Error::CartridgeReadError)?;

     

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               //Checks if the Nintendo logo matches the device's version. Early anti piracy feature. Neat to take note of

     

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               let nintendo_logo_from_rom = &rom_bytes[CartridgeHeaderAddress::NintendoLogoStart as usize

     

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                   ..CartridgeHeaderAddress::NintendoLogoEnd as usize + 1];

     

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               for (i, true_logo_byte) in NINTENDO_LOGO.iter().enumerate() {

     

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                   let rom_byte = nintendo_logo_from_rom[i];

     

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                   if rom_byte != *true_logo_byte {

     

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                       return Err(Error::CartridgeReadError);

     

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                   }

     

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               }

     

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               let title = &rom_bytes[CartridgeHeaderAddress::TitleStart as usize

     

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                   ..CartridgeHeaderAddress::TitleEnd as usize + 1];

     

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               let title_chars = Self::bytes_to_chars::<16>(title, true);

     

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               let manufacturer_code = &rom_bytes[CartridgeHeaderAddress::ManufacturerCodeStart as usize

     

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                   ..CartridgeHeaderAddress::ManufacturerCodeEnd as usize + 1];

     

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               let man_code_chars = Self::bytes_to_chars::<4>(manufacturer_code, false);

     

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               let cgb_flag_byte = rom_bytes[0x0143];

     

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               let cgb_flag = match cgb_flag_byte {

     

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                   0x80 => CGBFlag::SupportsColorBackwardCompatiable,

     

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                   0xC0 => CGBFlag::ColorOnly,

     

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                   _ => CGBFlag::NotSet,

     

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               };

     

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               let license_code = &rom_bytes[CartridgeHeaderAddress::NewLicenseStart as usize

     

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                   ..CartridgeHeaderAddress::NewLicenseEnd as usize + 1];

     

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               let license_code_chars = Self::bytes_to_chars::<2>(license_code, false);

     

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               // https://gbdev.io/pandocs/The_Cartridge_Header.html#0146--sgb-flag

     

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               let sgb_flag = rom_bytes[CartridgeHeaderAddress::SgbFlag as usize] == 0x03;

     

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               let cart_type =

     

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                   CartridgeType::from_byte(rom_bytes[CartridgeHeaderAddress::CartType as usize]);

     

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               let rom_size = RomSize::from_byte(rom_bytes[CartridgeHeaderAddress::RomSize as usize]);

     

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               let ram_size = RamSize::from_byte(rom_bytes[CartridgeHeaderAddress::RamSize as usize]);

     

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               let mut old_licensee_code = None;

     

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               if !sgb_flag {

     

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                   old_licensee_code = Some(rom_bytes[CartridgeHeaderAddress::OldLicenseeCode as usize])

     

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               }

     

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               let destination_code =

     

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                   DestinationCode::from_byte(rom_bytes[CartridgeHeaderAddress::DestinationCode as usize]);

     

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               let version = rom_bytes[CartridgeHeaderAddress::MaskRomVersion as usize];

     

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               let header_checksum = rom_bytes[CartridgeHeaderAddress::HeaderChecksum as usize];

     

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               let global_checksum = u16::from_le_bytes([

     

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                   rom_bytes[CartridgeHeaderAddress::GlobalChecksumStart as usize],

     

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                   rom_bytes[CartridgeHeaderAddress::CartridgeHeaderEnd as usize],

     

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               ]);

     

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               Ok(Self {

     

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                   buffer: header_buffer

     

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                       .try_into()

     

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                       .map_err(|_| Error::CartridgeReadError)?,

     

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                   title: title_chars,

     

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                   manufacturer_code: man_code_chars,

     

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                   cgb_flag,

     

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                   license_code: license_code_chars,

     

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                   support_gb: sgb_flag,

     

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                   cart_type,

     

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                   rom_size,

     

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                   ram_size,

     

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                   old_licensee_code,

     

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                   destination_code,

     

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                   version,

     

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                   header_checksum,

     

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                   global_checksum,

     

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               })

     

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           }

     

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           fn print_test(&self) {

     

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               for byte in self.buffer.iter() {

     

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                   print!("{} ", *byte as char);

     

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               }

     

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           }

     

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       }

     

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       fn main() -> std::io::Result<()> {

     

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           let mut rom_file = File::open(ROM_NAME)?;