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9c2ad0c60b
* Add byte swap for v64 files Signed-off-by: angie <angheloalf95@gmail.com> * Reduce `len` function calls Signed-off-by: angie <angheloalf95@gmail.com> * Optimze a bit the byte-swapped v64 format Signed-off-by: angie <angheloalf95@gmail.com> * Strip the overdump before doing the byte-swap The previous way wasted time by byte-swapping data that would be discarded anyway. Signed-off-by: angie <angheloalf95@gmail.com> * Swap twice the bytes per cycle to improve performance Signed-off-by: angie <angheloalf95@gmail.com> * Read and write 16 bytes at a time and specify explicit endianness Reading more bytes per cycle allow to speed up the swapping proccess Signed-off-by: angie <angheloalf95@gmail.com> * Add v64 compatibility in the Readme Signed-off-by: angie <angheloalf95@gmail.com> * Read whole file as little endian and write it as big endian without the loop Signed-off-by: angie <angheloalf95@gmail.com>
83 lines
2.5 KiB
Python
83 lines
2.5 KiB
Python
from os import path
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import sys
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import struct
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import hashlib
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def get_str_hash(byte_array):
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return str(hashlib.md5(byte_array).hexdigest())
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# If the baserom exists and is correct, we don't need to change anything
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if path.exists("baserom.z64"):
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with open("baserom.z64", mode="rb") as file:
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fileContent = bytearray(file.read())
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if get_str_hash(fileContent) == "f0b7f35375f9cc8ca1b2d59d78e35405":
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print("Found valid baserom - exiting early")
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sys.exit(0)
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# Determine if we have a ROM file
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romFileName = ""
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if path.exists("baserom_original.z64"):
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romFileName = "baserom_original.z64"
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elif path.exists("baserom_original.n64"):
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romFileName = "baserom_original.n64"
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elif path.exists("baserom_original.v64"):
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romFileName = "baserom_original.v64"
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else:
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print("Error: Could not find baserom_original.z64/baserom_original.n64/baserom_original.v64.")
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sys.exit(1)
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# Read in the original ROM
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print("File '" + romFileName + "' found.")
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with open(romFileName, mode="rb") as file:
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fileContent = bytearray(file.read())
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# Strip the overdump
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print("Stripping overdump...")
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fileContent = fileContent[0:0x3600000]
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fileContentLen = len(fileContent)
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# Check if ROM needs to be byte/word swapped
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# Little-endian
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if fileContent[0] == 0x40:
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# Word Swap ROM
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print("ROM needs to be word swapped...")
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words = str(int(fileContentLen/4))
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little_byte_format = "<" + words + "I"
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big_byte_format = ">" + words + "I"
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tmp = struct.unpack_from(little_byte_format, fileContent, 0)
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struct.pack_into(big_byte_format, fileContent, 0, *tmp)
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print("Word swapping done.")
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# Byte-swapped
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elif fileContent[0] == 0x37:
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# Byte Swap ROM
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print("ROM needs to be byte swapped...")
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halfwords = str(int(fileContentLen/2))
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little_byte_format = "<" + halfwords + "H"
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big_byte_format = ">" + halfwords + "H"
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tmp = struct.unpack_from(little_byte_format, fileContent, 0)
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struct.pack_into(big_byte_format, fileContent, 0, *tmp)
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print("Byte swapping done.")
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# Patch the header
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print("Patching header...")
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fileContent[0x3E] = 0x50
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# Check to see if the ROM is a "vanilla" Debug ROM
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str_hash = get_str_hash(bytearray(fileContent))
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if str_hash != "f0b7f35375f9cc8ca1b2d59d78e35405":
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print("Error: Expected a hash of f0b7f35375f9cc8ca1b2d59d78e35405 but got " + str_hash + ". " +
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"The baserom has probably been tampered, find a new one")
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sys.exit(1)
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# Write out our new ROM
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print("Writing new ROM 'baserom.z64'.")
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with open("baserom.z64", mode="wb") as file:
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file.write(bytes(fileContent))
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print("Done!")
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