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Use CIC 6102 for iQue decompressed ROMs (#2457)

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* Use CIC 6102 for iQue decompressed ROMs

* Future-proof is_ique

* Make things more readable
This commit is contained in:
cadmic 2025-02-06 12:10:30 -08:00 • committed by GitHub
parent 9a3878ec7e
commit e63d2b73b7
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GPG key ID: B5690EEEBB952194
3 changed files with 19 additions and 18 deletions
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6
Makefile
View file

@ -811,9 +811,6 @@ endif
#### Various Recipes ####
$(ROM): $(ELF)
$(ELF2ROM) -cic 6105 $< $@
ifeq ($(PLATFORM),IQUE)
COMPRESS_ARGS := --format gzip --pad-to 0x4000
CIC = 6102
@ -822,6 +819,9 @@ else
CIC = 6105
endif
$(ROM): $(ELF)
$(ELF2ROM) -cic $(CIC) $< $@
$(ROMC): $(ROM) $(ELF) $(BUILD_DIR)/compress_ranges.txt
$(PYTHON) tools/compress.py --in $(ROM) --out $@ --dmadata-start `./tools/dmadata_start.sh $(NM) $(ELF)` --compress `cat $(BUILD_DIR)/compress_ranges.txt` --threads $(N_THREADS) $(COMPRESS_ARGS)
$(PYTHON) -m ipl3checksum sum --cic $(CIC) --update $@

2
baseroms/ique-cn/checksum.md5
View file

@ -1 +1 @@
17a9f30d722c29e6912bd4b66713d2b0 build/ique-cn/oot-ique-cn.z64
0238288a8e7c53b558b818865daf6ef3 build/ique-cn/oot-ique-cn.z64

29
tools/decompress_baserom.py
View file

@ -30,10 +30,11 @@ def decompress_zlib(data: bytes) -> bytes:
return bytes(output)
def decompress(data: bytes, is_zlib_compressed: bool) -> bytes:
if is_zlib_compressed:
def decompress(data: bytes, is_ique: bool) -> bytes:
if is_ique:
return decompress_zlib(data)
return crunch64.yaz0.decompress(data)
else:
return crunch64.yaz0.decompress(data)
def round_up(n, shift):
@ -41,11 +42,13 @@ def round_up(n, shift):
return (n + mod - 1) >> shift << shift
def update_crc(decompressed: io.BytesIO) -> io.BytesIO:
def update_crc(decompressed: io.BytesIO, is_ique: bool) -> io.BytesIO:
print("Recalculating crc...")
calculated_checksum = ipl3checksum.CICKind.CIC_X105.calculateChecksum(
bytes(decompressed.getbuffer())
)
if is_ique:
cic_kind = ipl3checksum.CICKind.CIC_6102_7101
else:
cic_kind = ipl3checksum.CICKind.CIC_X105
calculated_checksum = cic_kind.calculateChecksum(bytes(decompressed.getbuffer()))
new_crc = struct.pack(f">II", calculated_checksum[0], calculated_checksum[1])
decompressed.seek(0x10)
@ -57,7 +60,7 @@ def decompress_rom(
file_content: bytearray,
dmadata_start: int,
dma_entries: list[dmadata.DmaEntry],
is_zlib_compressed: bool,
is_ique: bool,
) -> bytearray:
rom_segments = {} # vrom start : data s.t. len(data) == vrom_end - vrom_start
new_dmadata = [] # new dmadata: list[dmadata.Entry]
@ -73,7 +76,7 @@ def decompress_rom(
new_dmadata.append(dma_entry)
continue
if dma_entry.is_compressed():
new_contents = decompress(file_content[p_start:p_end], is_zlib_compressed)
new_contents = decompress(file_content[p_start:p_end], is_ique)
rom_segments[v_start] = new_contents
else:
rom_segments[v_start] = file_content[p_start : p_start + v_end - v_start]
@ -95,7 +98,7 @@ def decompress_rom(
decompressed.seek(padding_start)
decompressed.write(b"\x00" * (padding_end - padding_start))
# re-calculate crc
return bytearray(update_crc(decompressed).getbuffer())
return bytearray(update_crc(decompressed, is_ique).getbuffer())
def get_str_hash(byte_array):
@ -246,10 +249,8 @@ def main():
# Decompress
if any(dma_entry.is_compressed() for dma_entry in dma_entries):
print("Decompressing rom...")
is_zlib_compressed = version in {"ique-cn", "ique-zh"}
file_content = decompress_rom(
file_content, dmadata_start, dma_entries, is_zlib_compressed
)
is_ique = version.startswith("ique-")
file_content = decompress_rom(file_content, dmadata_start, dma_entries, is_ique)
# Double check the hash
str_hash = get_str_hash(file_content)