RAWFIX: Fix corrupt Canon Raw Files

gistfile1.txt

# RAWFIX: Fix corrupted Canon RAW files using a working donor image and exiftools
#
# Prerequisits: python3, exiftool
#
# Usage: just copy paste in python3 interactive mode and press enter twice, 
# after running the script, exit python and fix the repaired file (offset) using: 
# $ exiftool -tagsFromFile /Users/a/Downloads/recover-raw/3B1A5335.CR2 -all:all /Users/a/Downloads/recover-raw/3B1A5336-repaired.CR2
# optionally you can rebuild meta data so the file is more compatible: exiftool -overwrite_original -tagsFromFile /Users/a/Downloads/recover-raw/3B1A5335.CR2 -all:all /Users/apple/Downloads/recover-raw/3B1A5336-repaired.CR2

import os

donor_path = "/Users/a/Downloads/recover-raw/3B1A5335.CR2"
corrupt_path = "/Users/a/Downloads/recover-raw/3B1A5336-corrupt.CR2"
output_path = "/Users/a/Downloads/recover-raw/3B1A5336-repaired.CR2"

# Standard Canon CR2 header size safety range (128 KB)
HEADER_SIZE = 128 * 1024  

if not os.path.exists(donor_path) or not os.path.exists(corrupt_path):
    print("Error: Input files not found.")
    exit(1)

with open(donor_path, "rb") as f_donor:
    donor_header = f_donor.read(HEADER_SIZE)

with open(corrupt_path, "rb") as f_corrupt:
    # Skip damaged header area of corrupted file and retain sensor data stream
    f_corrupt.seek(HEADER_SIZE)
    corrupt_body = f_corrupt.read()

with open(output_path, "wb") as f_out:
    f_out.write(donor_header)
    f_out.write(corrupt_body)

print(f"Repaired file written to: {output_path}")