380 lines
9.4 KiB
Go
380 lines
9.4 KiB
Go
package main
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import (
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"bytes"
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"fmt"
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"io"
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"log"
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"os"
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)
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func main() {
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var count int
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// See https://gbdev.io/pandocs/The_Cartridge_Header.html#0104-0133--nintendo-logo
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expected_logo := []byte{
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0xCE, 0xED, 0x66, 0x66, 0xCC, 0x0D, 0x00, 0x0B,
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0x03, 0x73, 0x00, 0x83, 0x00, 0x0C, 0x00, 0x0D,
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0x00, 0x08, 0x11, 0x1F, 0x88, 0x89, 0x00, 0x0E,
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0xDC, 0xCC, 0x6E, 0xE6, 0xDD, 0xDD, 0xD9, 0x99,
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0xBB, 0xBB, 0x67, 0x63, 0x6E, 0x0E, 0xEC, 0xCC,
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0xDD, 0xDC, 0x99, 0x9F, 0xBB, 0xB9, 0x33, 0x3E,
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}
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// Cartridge types
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// See https://gbdev.io/pandocs/The_Cartridge_Header.html#0147--cartridge-type
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cartridge_types := map[byte]string{
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0x00: "ROM ONLY",
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0x01: "MBC1",
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0x02: "MBC1+RAM",
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0x03: "MBC1+RAM+BATTERY",
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0x05: "MBC2",
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0x06: "MBC2+BATTERY",
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0x08: "ROM+RAM 9",
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0x09: "ROM+RAM+BATTERY 9",
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0x0B: "MMM01",
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0x0C: "MMM01+RAM",
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0x0D: "MMM01+RAM+BATTERY",
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0x0F: "MBC3+TIMER+BATTERY",
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0x10: "MBC3+TIMER+RAM+BATTERY 10",
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0x11: "MBC3",
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0x12: "MBC3+RAM 10",
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0x13: "MBC3+RAM+BATTERY 10",
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0x19: "MBC5",
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0x1A: "MBC5+RAM",
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0x1B: "MBC5+RAM+BATTERY",
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0x1C: "MBC5+RUMBLE",
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0x1D: "MBC5+RUMBLE+RAM",
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0x1E: "MBC5+RUMBLE+RAM+BATTERY",
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0x20: "MBC6",
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0x22: "MBC7+SENSOR+RUMBLE+RAM+BATTERY",
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0xFC: "POCKET CAMERA",
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0xFD: "BANDAI TAMA5",
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0xFE: "HuC3",
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0xFF: "HuC1+RAM+BATTERY",
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}
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// RAM sizes
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// https://gbdev.io/pandocs/The_Cartridge_Header.html#0149--ram-size
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ram_sizes := map[byte]string{
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0x00: "0 - No RAM ",
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0x01: "UNUSED VALUE",
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0x02: "8 KiB - 1 bank",
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0x03: "32 KiB - 4 banks of 8 KiB each",
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0x04: "128 KiB 16 banks of 8 KiB each",
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0x05: "64 KiB 8 banks of 8 KiB each",
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}
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// Old licensees
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// https://gbdev.io/pandocs/The_Cartridge_Header.html#014b--old-licensee-code
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old_licensees := map[byte]string{
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0x00: "None",
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0x01: "Nintendo",
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0x08: "Capcom",
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0x09: "HOT-B",
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0x0A: "Jaleco",
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0x0B: "Coconuts Japan",
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0x0C: "Elite Systems",
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0x13: "EA (Electronic Arts)",
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0x18: "Hudson Soft",
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0x19: "ITC Entertainment",
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0x1A: "Yanoman",
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0x1D: "Japan Clary",
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0x1F: "Virgin Games Ltd.3",
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0x24: "PCM Complete",
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0x25: "San-X",
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0x28: "Kemco",
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0x29: "SETA Corporation",
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0x30: "Infogrames5",
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0x31: "Nintendo",
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0x32: "Bandai",
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0x33: "Indicates that the New licensee code should be used instead.",
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0x34: "Konami",
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0x35: "HectorSoft",
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0x38: "Capcom",
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0x39: "Banpresto",
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0x3C: "Entertainment Interactive (stub)",
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0x3E: "Gremlin",
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0x41: "Ubi Soft1",
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0x42: "Atlus",
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0x44: "Malibu Interactive",
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0x46: "Angel",
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0x47: "Spectrum HoloByte",
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0x49: "Irem",
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0x4A: "Virgin Games Ltd.3",
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0x4D: "Malibu Interactive",
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0x4F: "U.S. Gold",
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0x50: "Absolute",
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0x51: "Acclaim Entertainment",
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0x52: "Activision",
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0x53: "Sammy USA Corporation",
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0x54: "GameTek",
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0x55: "Park Place13",
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0x56: "LJN",
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0x57: "Matchbox",
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0x59: "Milton Bradley Company",
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0x5A: "Mindscape",
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0x5B: "Romstar",
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0x5C: "Naxat Soft14",
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0x5D: "Tradewest",
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0x60: "Titus Interactive",
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0x61: "Virgin Games Ltd.3",
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0x67: "Ocean Software",
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0x69: "EA (Electronic Arts)",
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0x6E: "Elite Systems",
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0x6F: "Electro Brain",
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0x70: "Infogrames5",
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0x71: "Interplay Entertainment",
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0x72: "Broderbund",
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0x73: "Sculptured Software6",
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0x75: "The Sales Curve Limited7",
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0x78: "THQ",
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0x79: "Accolade15",
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0x7A: "Triffix Entertainment",
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0x7C: "MicroProse",
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0x7F: "Kemco",
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0x80: "Misawa Entertainment",
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0x83: "LOZC G.",
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0x86: "Tokuma Shoten",
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0x8B: "Bullet-Proof Software2",
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0x8C: "Vic Tokai Corp.16",
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0x8E: "Ape Inc.17",
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0x8F: "I’Max18",
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0x91: "Chunsoft Co.8",
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0x92: "Video System",
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0x93: "Tsubaraya Productions",
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0x95: "Varie",
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0x96: "Yonezawa19/S’Pal",
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0x97: "Kemco",
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0x99: "Arc",
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0x9A: "Nihon Bussan",
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0x9B: "Tecmo",
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0x9C: "Imagineer",
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0x9D: "Banpresto",
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0x9F: "Nova",
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0xA1: "Hori Electric",
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0xA2: "Bandai",
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0xA4: "Konami",
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0xA6: "Kawada",
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0xA7: "Takara",
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0xA9: "Technos Japan",
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0xAA: "Broderbund",
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0xAC: "Toei Animation",
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0xAD: "Toho",
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0xAF: "Namco",
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0xB0: "Acclaim Entertainment",
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0xB1: "ASCII Corporation or Nexsoft",
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0xB2: "Bandai",
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0xB4: "Square Enix",
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0xB6: "HAL Laboratory",
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0xB7: "SNK",
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0xB9: "Pony Canyon",
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0xBA: "Culture Brain",
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0xBB: "Sunsoft",
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0xBD: "Sony Imagesoft",
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0xBF: "Sammy Corporation",
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0xC0: "Taito",
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0xC2: "Kemco",
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0xC3: "Square",
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0xC4: "Tokuma Shoten",
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0xC5: "Data East",
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0xC6: "Tonkin House",
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0xC8: "Koei",
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0xC9: "UFL",
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0xCA: "Ultra Games",
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0xCB: "VAP, Inc.",
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0xCC: "Use Corporation",
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0xCD: "Meldac",
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0xCE: "Pony Canyon",
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0xCF: "Angel",
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0xD0: "Taito",
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0xD1: "SOFEL (Software Engineering Lab)",
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0xD2: "Quest",
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0xD3: "Sigma Enterprises",
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0xD4: "ASK Kodansha Co.",
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0xD6: "Naxat Soft14",
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0xD7: "Copya System",
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0xD9: "Banpresto",
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0xDA: "Tomy",
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0xDB: "LJN",
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0xDD: "Nippon Computer Systems",
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0xDE: "Human Ent.",
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0xDF: "Altron",
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0xE0: "Jaleco",
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0xE1: "Towa Chiki",
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0xE2: "Yutaka # Needs more info",
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0xE3: "Varie",
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0xE5: "Epoch",
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0xE7: "Athena",
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0xE8: "Asmik Ace Entertainment",
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0xE9: "Natsume",
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0xEA: "King Records",
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0xEB: "Atlus",
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0xEC: "Epic/Sony Records",
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0xEE: "IGS",
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0xF0: "A Wave",
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0xF3: "Extreme Entertainment",
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0xFF: "LJN",
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}
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file, err := os.Open("rom.gb")
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if err != nil {
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log.Fatal(err)
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}
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defer file.Close()
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fmt.Printf("Loading ROM file \"%s\"\n", file.Name())
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_, err = file.Seek(0X100, 0)
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if err != nil {
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log.Fatal(err)
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}
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entrypoint := make([]byte, 4)
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count, err = file.Read(entrypoint)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read entrypoint instructions: %X\n\n", entrypoint[:count])
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fmt.Println("Reading header")
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logo := make([]byte, 48)
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count, err = file.Read(logo)
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if err != nil {
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log.Fatal(err)
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}
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if bytes.Equal(logo, expected_logo) {
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fmt.Println("Valid logo found")
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} else {
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log.Fatal("Invalid ROM file: No valid logo found!")
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}
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// NOTE(m): Assuming "old" cartridges here. This may cause problems with newer cartridges.
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// See https://gbdev.io/pandocs/The_Cartridge_Header.html#0134-0143--title
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raw_title := make([]byte, 16)
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count, err = file.Read(raw_title)
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if err != nil {
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log.Fatal(err)
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}
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// Strip padding bytes
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title := bytes.ReplaceAll(raw_title, []byte{0x00}, nil)
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fmt.Printf("Read title: %s\n", title)
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new_licensee := make([]byte, 2)
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count, err = file.Read(new_licensee)
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if err != nil {
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log.Fatal(err)
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}
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if bytes.Equal(new_licensee, []byte{0x00, 0x00}) {
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fmt.Println("Read new licensee: N/A")
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} else {
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fmt.Printf("Read new licensee: %q\n", new_licensee[:count])
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}
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sgb_flag := make([]byte, 1)
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count, err = file.Read(sgb_flag)
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if err != nil {
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log.Fatal(err)
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}
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if bytes.Equal(sgb_flag, []byte{0x03}) {
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fmt.Println("Read SGB flag: SGB support")
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} else {
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fmt.Println("Read SGB flag: No SGB support")
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}
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cartridge_type := make([]byte, 1)
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count, err = file.Read(cartridge_type)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read cartridge type: %s\n", cartridge_types[cartridge_type[0]])
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raw_rom_size := make([]byte, 1)
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count, err = file.Read(raw_rom_size)
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if err != nil {
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log.Fatal(err)
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}
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rom_size := 32 * (1 << raw_rom_size[0])
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fmt.Printf("Read ROM size: %d bytes\n", rom_size)
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ram_size := make([]byte, 1)
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count, err = file.Read(ram_size)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read RAM size: %s\n", ram_sizes[ram_size[0]])
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destination_code := make([]byte, 1)
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count, err = file.Read(destination_code)
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if err != nil {
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log.Fatal(err)
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}
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if bytes.Equal(destination_code, []byte{0x00}) {
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fmt.Println("Read destination code: Japan (and possibly overseas)")
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} else if bytes.Equal(destination_code, []byte{0x01}) {
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fmt.Println("Read destination code: Overseas only")
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} else {
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fmt.Println("Read destination code: Invalid value")
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}
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old_licensee := make([]byte, 1)
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count, err = file.Read(old_licensee)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read old licensee: %s\n", old_licensees[old_licensee[0]])
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rom_version := make([]byte, 1)
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count, err = file.Read(rom_version)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read Mask ROM version number: %X\n", rom_version[:count])
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header_checksum := make([]byte, 1)
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count, err = file.Read(header_checksum)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read header checksum: %X\n", header_checksum[:count])
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// FIXME(m): Calculate and validate checksum!
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global_checksum := make([]byte, 2)
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count, err = file.Read(global_checksum)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Read global checksum: %X\n", global_checksum[:count])
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// NOTE(m): Not used, except by one emulator.
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// See https://gbdev.io/pandocs/The_Cartridge_Header.html#014e-014f--global-checksum
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fmt.Printf("Finished reading header\n\n")
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printCurrentPosition(file)
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}
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func printCurrentPosition(file *os.File) {
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pos, err := file.Seek(0, io.SeekCurrent)
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if err != nil {
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panic(err)
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}
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fmt.Printf("Current position: 0x%X\n", pos)
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}
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