NdsHeader
NdsHeader is a library that can read and verify certain portions of the headers on Nintendo DS roms. It aims to provide these facilities:
- CRC checking (data integrity verification)
- Encryption/Decryption support
- Filesystem Extraction
- Header information (Codes, Titles, Banners, Icons)
The output for Nintendo's Touch! Kirby is presented below. Note that banner title's are stored in unicode, and decyphered using python's native unicode support. Upper ascii works, too (like the accented 'e' in Pokémon or the titles of french games). The only thing that is not implemented is the Segment3 CRC code. The writers of NDStool claim that Nintendo is using ccitt instead of crc16, but I am unsure why. I haven't been able to dump (or find a dump of) a rom that actually checksums using ccitt to the magic number in NDStool, so I'm putting this feature on hold until I figure out it's usefulness.
Header Information: 0x00 Game title TOUCH!KIRBY 0x0C Game code ATKJ (NTR-ATKJ-JPN) 0x10 Maker code 01 (Nintendo) 0x12 Unit code 0x00 0x13 Device type 0x00 0x14 Device capacity 0x09 (512 Mbit) 0x15 Reserved 1 000000000000000000 0x1E ROM version 0x00 0x1F Reserved 2 0x00 0x20 ARM9 ROM offset 0x4000 0x24 ARM9 entry address 0x2000800 0x28 ARM9 RAM address 0x2000000 0x2C ARM9 code size 0xD66F8 0x30 ARM7 ROM offset 0x1B0800 0x34 ARM7 entry address 0x2380000 0x38 ARM7 RAM address 0x2380000 0x3C ARM7 code size 0x2352C 0x40 File name table offset 0x1D3E00 0x44 File name table size 0xB960 0x48 FAT offset 0x1DF800 0x4C FAT size 0x4508 0x50 ARM9 overlay offset 0xDA800 0x54 ARM9 overlay size 0x120 0x58 ARM7 overlay offset 0x00 0x5C ARM7 overlay size 0x00 0x60 ROM control info 1 0x00586000 0x64 ROM control info 2 0x001808F8 0x6E ROM control info 3 0x051E 0x68 Icon/Title offset 0x1E3E00 0x6C Secure area CRC 0x1EE7 (OK, decrypted) 0x70 ARM9 ? 0x02000A10 0x74 ARM7 ? 0x02380118 0x78 Magic 1 0x00000000 0x7C Magic 2 0x00000000 0x80 Application end offset 0x032B7960 0x84 ROM header size 0x00004000 0x15C Logo CRC 0xCF56 (OK) 0x15E Header CRC 0x4EA8 (OK) Banner CRC: 0x5257 (OK) Japanese banner text, line 1: タッチ！カービィ Japanese banner text, line 2: Nintendo ARM9 footer found. Security data CRC (0x1000-0x2FFF) 0x6FFF Segment3 CRC (0x3000-0x3FFF) (NYI)
