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Allow SBN files to be reencoded as little endian #1122

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Allow SBN files to be reencoded as little endian #1122

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bf261e1
added little endian suport for SBN files
Hurricane996 Oct 24, 2023
cb5a811
formatting
Hurricane996 Oct 24, 2023
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29 changes: 19 additions & 10 deletions tools/splat_ext/pm_sbn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,13 @@ def align(misaligned: int):
return (misaligned + 0xF) & (~0xF)


def convert_fstring_to_proper_endianness(le: bool, fstring: str) -> str:
if le:
return fstring.replace(">", "<")
else:
return fstring


class SBN:
files: List["SBNFile"]
unknown_data: bytes
Expand Down Expand Up @@ -71,7 +78,9 @@ def decode(self, data: bytes):

return len(data)

def encode(self) -> bytes:
def encode(self, is_le: bool = false) -> bytes:
convert_fstring = functools.partial(convert_fstring_to_proper_endianness, is_le)

num_bytes = 0
num_bytes += 0x40 # header

Expand Down Expand Up @@ -121,7 +130,7 @@ def encode(self) -> bytes:
INIToffset=init_header_offset,
)

struct.pack_into(SBNHeader.fstring, data, 0, *header)
struct.pack_into(convert_fstring(SBNHeader.fstring), data, 0, *header)

# unknown data
for offset, byte in enumerate(self.unknown_data):
Expand Down Expand Up @@ -149,7 +158,7 @@ def encode(self) -> bytes:
entry = SBNFileEntry(offset=current_file_offset, fmt=format, size=file.fakesize)

struct.pack_into(
SBNFileEntry.fstring,
convert_fstring(SBNFileEntry.fstring),
data,
entries_offset + index * SBNFileEntry.length,
*entry,
Expand All @@ -171,29 +180,29 @@ def encode(self) -> bytes:
shortsSize=mseq_end - mseq_offset,
)

struct.pack_into(INITHeader.fstring, data, init_header_offset, *initHeader)
struct.pack_into(convert_fstring(INITHeader.fstring), data, init_header_offset, *initHeader)

current_bank_offset = bank_entry_offset
for bank in self.init.bk_entries:
struct.pack_into(BufferEntry.fstring, data, current_bank_offset, *bank)
struct.pack_into(convert_fstring(BufferEntry.fstring), data, current_bank_offset, *bank)
current_bank_offset += BufferEntry.length

sentinel = BufferEntry(0xFFFF, 0x00, 0x00)
struct.pack_into(BufferEntry.fstring, data, current_bank_offset, *sentinel)
struct.pack_into(convert_fstring(BufferEntry.fstring), data, current_bank_offset, *sentinel)

current_song_offset = song_entry_offset
for song in self.init.song_entries:
struct.pack_into(InitSongEntry.fstring, data, current_song_offset, *song)
struct.pack_into(convert_fstring(InitSongEntry.fstring), data, current_song_offset, *song)
current_song_offset += InitSongEntry.length

sentinel2 = InitSongEntry(0xFFFF, 0x00, 0x00, 0x00)
struct.pack_into(InitSongEntry.fstring, data, current_song_offset, *sentinel2)
struct.pack_into(convert_fstring(InitSongEntry.fstring), data, current_song_offset, *sentinel2)

current_mseq_offset = mseq_offset
for mseq in self.init.mseq_entries:
struct.pack_into(">H", data, current_mseq_offset, mseq)
struct.pack_into(convert_fstring(">H"), data, current_mseq_offset, mseq)
current_mseq_offset += 2
struct.pack_into(">H", data, current_mseq_offset, 0xFFFF)
struct.pack_into(convert_fstring(">H"), data, current_mseq_offset, 0xFFFF)

return bytes(data)

Expand Down
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