···
3
+
use crate::enums::CartridgeHeaderAddress::OldLicenseeCode;
5
+
CGBFlag, CartridgeHeaderAddress, CartridgeType, DestinationCode, Error, RamSize, RomSize,
2
-
use std::io::{Read, Seek, SeekFrom, Write};
10
+
// https://github.com/ISSOtm/gb-bootroms/blob/2dce25910043ce2ad1d1d3691436f2c7aabbda00/src/dmg.asm#L259-L269
11
+
// Each tile is encoded using 2 (!) bytes
12
+
// The tiles are represented below
13
+
// XX.. .XX. XX.. .... .... .... .... .... .... ...X X... ....
14
+
// XXX. .XX. XX.. .... ..XX .... .... .... .... ...X X... ....
15
+
// XXX. .XX. .... .... .XXX X... .... .... .... ...X X... ....
16
+
// XX.X .XX. XX.X X.XX ..XX ..XX XX.. XX.X X... XXXX X..X XXX.
17
+
// XX.X .XX. XX.X XX.X X.XX .XX. .XX. XXX. XX.X X..X X.XX ..XX
18
+
// XX.. XXX. XX.X X..X X.XX .XXX XXX. XX.. XX.X X..X X.XX ..XX
19
+
// XX.. XXX. XX.X X..X X.XX .XX. .... XX.. XX.X X..X X.XX ..XX
20
+
// XX.. .XX. XX.X X..X X.XX ..XX XXX. XX.. XX.. XXXX X..X XXX.
21
+
const NINTENDO_LOGO: [u8; 48] = [
22
+
0x0CE, 0x0ED, 0x066, 0x066, 0x0CC, 0x00D, 0x000, 0x00B, 0x003, 0x073, 0x000, 0x083, 0x000,
23
+
0x00C, 0x000, 0x00D, 0x000, 0x008, 0x011, 0x01F, 0x088, 0x089, 0x000, 0x00E, 0x0DC, 0x0CC,
24
+
0x06E, 0x0E6, 0x0DD, 0x0DD, 0x0D9, 0x099, 0x0BB, 0x0BB, 0x067, 0x063, 0x06E, 0x00E, 0x0EC,
25
+
0x0CC, 0x0DD, 0x0DC, 0x099, 0x09F, 0x0BB, 0x0B9, 0x033, 0x03E,
28
+
// const ROM_NAME: &str = "OtherLegallyObtainedRom.gb";
const ROM_NAME: &str = "LegallyObtainedRom.gb";
//Should be 80 bytes (0x014F(335) - 0x0100(256)) + 1 to include the last address
35
+
manufacturer_code: [char; 4],
37
+
// https://gbdev.io/pandocs/The_Cartridge_Header.html#01440145--new-licensee-code
38
+
license_code: [char; 2],
40
+
cart_type: CartridgeType,
43
+
old_licensee_code: Option<u8>,
44
+
destination_code: DestinationCode,
46
+
header_checksum: u8,
47
+
global_checksum: u16,
50
+
impl CartridgeHeader {
51
+
fn bytes_to_chars<const N: usize>(bytes: &[u8], break_on_null: bool) -> [char; N] {
52
+
let mut chars = [0x000 as char; N];
53
+
for (i, byte) in bytes.iter().enumerate() {
54
+
if break_on_null && *byte == 0x00 {
57
+
chars[i] = *byte as char;
62
+
fn parse(rom_bytes: &[u8]) -> Result<Self, Error> {
63
+
let start = CartridgeHeaderAddress::CartridgeHeaderStart as usize;
64
+
let end = start + 80;
65
+
let header_buffer: &[u8] = rom_bytes[start..end]
67
+
.map_err(|_| Error::CartridgeReadError)?;
69
+
//Checks if the Nintendo logo matches the device's version. Early anti piracy feature. Neat to take note of
70
+
let nintendo_logo_from_rom = &rom_bytes[CartridgeHeaderAddress::NintendoLogoStart as usize
71
+
..CartridgeHeaderAddress::NintendoLogoEnd as usize + 1];
72
+
for (i, true_logo_byte) in NINTENDO_LOGO.iter().enumerate() {
73
+
let rom_byte = nintendo_logo_from_rom[i];
74
+
if rom_byte != *true_logo_byte {
75
+
return Err(Error::CartridgeReadError);
79
+
let title = &rom_bytes[CartridgeHeaderAddress::TitleStart as usize
80
+
..CartridgeHeaderAddress::TitleEnd as usize + 1];
81
+
let title_chars = Self::bytes_to_chars::<16>(title, true);
83
+
let manufacturer_code = &rom_bytes[CartridgeHeaderAddress::ManufacturerCodeStart as usize
84
+
..CartridgeHeaderAddress::ManufacturerCodeEnd as usize + 1];
85
+
let man_code_chars = Self::bytes_to_chars::<4>(manufacturer_code, false);
21
-
impl CartridgeHeader {
22
-
fn new(rom_bytes: &[u8] ) -> Result<Self, Error> {
23
-
let start = CartridgeHeaderAddress::CartridgeHeaderStart as usize;
24
-
//We know the header is only 80 chars
25
-
let end = start + 80;
87
+
let cgb_flag_byte = rom_bytes[0x0143];
88
+
let cgb_flag = match cgb_flag_byte {
89
+
0x80 => CGBFlag::SupportsColorBackwardCompatiable,
90
+
0xC0 => CGBFlag::ColorOnly,
91
+
_ => CGBFlag::NotSet,
94
+
let license_code = &rom_bytes[CartridgeHeaderAddress::NewLicenseStart as usize
95
+
..CartridgeHeaderAddress::NewLicenseEnd as usize + 1];
96
+
let license_code_chars = Self::bytes_to_chars::<2>(license_code, false);
98
+
// https://gbdev.io/pandocs/The_Cartridge_Header.html#0146--sgb-flag
99
+
let sgb_flag = rom_bytes[CartridgeHeaderAddress::SgbFlag as usize] == 0x03;
102
+
CartridgeType::from_byte(rom_bytes[CartridgeHeaderAddress::CartType as usize]);
104
+
let rom_size = RomSize::from_byte(rom_bytes[CartridgeHeaderAddress::RomSize as usize]);
105
+
let ram_size = RamSize::from_byte(rom_bytes[CartridgeHeaderAddress::RamSize as usize]);
107
+
let mut old_licensee_code = None;
109
+
old_licensee_code = Some(rom_bytes[CartridgeHeaderAddress::OldLicenseeCode as usize])
112
+
let destination_code =
113
+
DestinationCode::from_byte(rom_bytes[CartridgeHeaderAddress::DestinationCode as usize]);
115
+
let version = rom_bytes[CartridgeHeaderAddress::MaskRomVersion as usize];
116
+
let header_checksum = rom_bytes[CartridgeHeaderAddress::HeaderChecksum as usize];
117
+
let global_checksum = u16::from_le_bytes([
118
+
rom_bytes[CartridgeHeaderAddress::GlobalChecksumStart as usize],
119
+
rom_bytes[CartridgeHeaderAddress::CartridgeHeaderEnd as usize],
28
-
buffer: rom_bytes[start..end].try_into().map_err(|_| Error::CartridgeReadError)?
123
+
buffer: header_buffer
125
+
.map_err(|_| Error::CartridgeReadError)?,
126
+
title: title_chars,
127
+
manufacturer_code: man_code_chars,
129
+
license_code: license_code_chars,
130
+
support_gb: sgb_flag,
···
40
-
pub enum CartridgeHeaderAddress {
41
-
CartridgeHeaderStart = 0x0100,
42
-
CartridgeHeaderEnd = 0x014F
fn main() -> std::io::Result<()> {
let mut rom_file = File::open(ROM_NAME)?;
let mut rom_buffer: Vec<u8> = Vec::new();
rom_file.read_to_end(&mut rom_buffer)?;
50
-
let cart_header = CartridgeHeader::new(&*rom_buffer).map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, "Rom failed to parse"))?;
51
-
cart_header.print_test();
153
+
let cart_header = match CartridgeHeader::parse(&*rom_buffer) {
154
+
Ok(header) => header,
156
+
return Err(std::io::Error::new(
157
+
std::io::ErrorKind::Other,
158
+
"Rom failed to parse",
162
+
// cart_header.print_test();
164
+
let title: String = String::from_iter(cart_header.title);
165
+
println!("Title: {}", title);
166
+
let manufacturer_code = String::from_iter(cart_header.manufacturer_code);
167
+
println!("Manufacturer Code: {}", manufacturer_code);
56
-
fn buffer_from_file(path: &str) -> Vec<u8> {
57
-
let mut file = std::fs::File::open(path).expect("File not there");
58
-
let mut buffer = Vec::new();
59
-
file.read_to_end(&mut buffer).expect("Could not read file");
169
+
match cart_header.old_licensee_code {
170
+
Some(code) => println!("Uses Old Licensee Code: {:#X}", code),
172
+
"Uses New Licensee Code: {}",
173
+
String::from_iter(cart_header.license_code)
177
+
println!("CGB Flag: {:?}", cart_header.cgb_flag);
178
+
println!("Supports SGB: {:?}", cart_header.support_gb);
179
+
println!("Cartridge Type: {:?}", cart_header.cart_type);
180
+
println!("ROM Size: {:?}", cart_header.rom_size);
181
+
println!("RAM Size: {:?}", cart_header.ram_size);
182
+
match cart_header.destination_code {
183
+
DestinationCode::Japan => println!("Destination Code: Japan"),
184
+
DestinationCode::NotJapan => println!("Destination Code: Not Japan"),
186
+
println!("Version: {:?}", cart_header.version);
187
+
println!("Header Checksum: {:#X}", cart_header.header_checksum);
188
+
println!("Global Checksum: {:#X}", cart_header.global_checksum);
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