Big improvement to IIDX Music DB handling, getting rid of all but one magic constant in the code.
This commit is contained in:
Jennifer Taylor
parent
2e3e6bfbd3
commit
1c54a329fe
@ -17,6 +17,8 @@ class IIDXSong:
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"""
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Initialize a IIDX Song. Everything is self-explanatory except difficulties, which
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is a list of integers representing the difficulty for SPN, SPH, SPA, DPN, DPH, DPA.
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For IIDX 27 and above, there are 4 additional charts in the difficulties list for
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B7, L7, B14 and L14.
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"""
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self.id = songid
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self.title = title
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@ -31,7 +33,7 @@ class IIDXMusicDB:
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def __init__(self, data: bytes) -> None:
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self.__songs: Dict[int, Tuple[IIDXSong, int]] = {}
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self.__data = data
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self.__parse_db(data)
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self.__version = self.__parse_db(data)
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def get_new_db(self) -> bytes:
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# Write out a new music DB based on any possible changes to songs
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@ -53,86 +55,115 @@ class IIDXMusicDB:
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data = copy_over(data, format_string(song.genre), offset, 128)
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data = copy_over(data, format_string(song.artist), offset, 192)
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data = copy_over(data, bytes([song.folder]), offset, 280)
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data = copy_over(data, bytes(song.difficulties), offset, 288)
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if self.__version < 27:
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# This is easy.
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data = copy_over(data, bytes(song.difficulties), offset, 288)
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elif self.__version >= 27:
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# This is gross, but I'm too lazy to do it right.
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data = copy_over(data, bytes([song.difficulties[6]]), offset, 288)
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data = copy_over(data, bytes(song.difficulties[0:3]), offset, 289)
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data = copy_over(data, bytes(song.difficulties[7:9]), offset, 292)
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data = copy_over(data, bytes(song.difficulties[3:6]), offset, 294)
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data = copy_over(data, bytes([song.difficulties[9]]), offset, 297)
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return data
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def __parse_db(self, data: bytes) -> None:
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def __parse_string(self, string: bytes) -> str:
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for i in range(len(string)):
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if string[i] == 0:
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string = string[:i]
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break
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return string.decode("shift-jis")
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def __parse_db(self, data: bytes) -> int:
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# Verify the signature
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sig = struct.unpack_from(
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"<4s",
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magic, gameversion, songcount, indexcount = struct.unpack_from(
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"<4sBxxxHHxxxx",
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data,
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0,
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)
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# Offset and difference lookup (not sure this is always right)
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gameversion = data[4]
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if gameversion == 20:
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offset = 0xA420
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leap = 0x320
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elif gameversion == 21:
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offset = 0xABF0
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leap = 0x320
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elif gameversion == 22:
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offset = 0xB3C0
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leap = 0x340
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elif gameversion == 23:
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offset = 0xBB90
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leap = 0x340
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elif gameversion == 24:
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offset = 0xC360
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leap = 0x340
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elif gameversion == 25:
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offset = 0xCB30
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leap = 0x340
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elif gameversion == 26:
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offset = 0xD300
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leap = 0x344
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else:
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if magic != b"IIDX":
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raise Exception(f"Invalid signature '{magic}' found!")
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# Stride lookup, which appears unfortunately hardcoded in the game DLL.
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leap = {
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20: 0x320,
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21: 0x320,
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22: 0x340,
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23: 0x340,
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24: 0x340,
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25: 0x340,
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26: 0x344,
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27: 0x52C,
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28: 0x52C,
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}.get(gameversion)
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if leap is None:
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raise Exception(f"Unsupported game version {gameversion} found!")
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if sig[0] != b"IIDX":
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raise Exception(f"Invalid signature '{sig[0]}' found!")
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def parse_string(string: bytes) -> str:
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for i in range(len(string)):
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if string[i] == 0:
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string = string[:i]
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break
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return string.decode("shift-jis")
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# Skip past index nodes, which are all 16-bit integers, and past 16 byte header.
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offset = (indexcount * 2) + 0x10
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# Load songs
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while True:
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try:
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for songid in range(songcount):
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songoffset = offset + (songid * leap)
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if gameversion < 27:
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songdata = struct.unpack_from(
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"<64s64s64s64s24xB7xBBBBBB162xH",
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data,
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offset,
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songoffset,
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)
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song = IIDXSong(
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songid=songdata[11],
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title=self.__parse_string(songdata[0]),
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english_title=self.__parse_string(songdata[1]),
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genre=self.__parse_string(songdata[2]),
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artist=self.__parse_string(songdata[3]),
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difficulties=[
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songdata[5],
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songdata[6],
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songdata[7],
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songdata[8],
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songdata[9],
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songdata[10],
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],
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folder=songdata[4],
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)
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elif gameversion >= 27:
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# Heroic Verse and above have a completely different structure for song entries
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songdata = struct.unpack_from(
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"<64s64s64s64s24xB7x10B646xH",
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data,
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songoffset,
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)
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song = IIDXSong(
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songid=songdata[15],
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title=self.__parse_string(songdata[0]),
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english_title=self.__parse_string(songdata[1]),
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genre=self.__parse_string(songdata[2]),
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artist=self.__parse_string(songdata[3]),
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difficulties=[
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songdata[6],
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songdata[7],
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songdata[8],
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songdata[11],
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songdata[12],
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songdata[13],
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songdata[5],
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songdata[9],
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songdata[10],
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songdata[14],
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],
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folder=songdata[4],
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)
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except struct.error:
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# Out of input!
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break
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songoffset = offset
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offset = offset + leap
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song = IIDXSong(
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songdata[11],
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parse_string(songdata[0]),
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parse_string(songdata[1]),
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parse_string(songdata[2]),
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parse_string(songdata[3]),
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[
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songdata[5],
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songdata[6],
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songdata[7],
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songdata[8],
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songdata[9],
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songdata[10],
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],
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songdata[4],
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)
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if song.artist == "event_data" and song.genre == "event_data":
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continue
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self.__songs[songdata[11]] = (song, songoffset)
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self.__songs[song.id] = (song, songoffset)
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return gameversion
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@property
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def songs(self) -> List[IIDXSong]:
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