- 파일 다른점 비교하는 프로그램(file diff tool util, different compare program)

//-------------------------------------
텍스트 파일(text file diff)

* WinMerge
https://winmerge.org

//-------------------------------------
이진 파일 비교(binary file diff)

* HxD
https://mh-nexus.de/en/

- 사용법
파일 2개 열기 
-> (메뉴) Analysis -> Data Comparison -> Compare (Ctrl+K)

//-----------------------------------------------------------------------------

이진 파일 비교 결과, 다른 byte 수 구하기, python 소스 코드

import sys, os, time

def compare_binary_files(file1_path, file2_path):
try:
start_time = time.time()

with open(file1_path, "rb") as file1, open(file2_path, "rb") as file2:
# Read entire contents of both files
content1 = file1.read()
content2 = file2.read()

diff_size = abs(len(content1) - len(content2))

large_file = None
if len(content1) > len(content2):
content1, content2 = content2, content1 # swap
large_file = file1_path
elif len(content1) < len(content2):
large_file = file2_path
else:
large_file = None

print(f"Large file: {large_file}")

# Compare bytes and count differences
compare_start_time = time.time()
diff_count = 0

# 블록 단위 비교
BLOCK_SIZE = 1024 * 1024
total_bytes_compared = min(len(content1), len(content2))

for i in range(0, total_bytes_compared, BLOCK_SIZE):
block1 = content1[i : i + BLOCK_SIZE]
block2 = content2[i : i + BLOCK_SIZE]

if block1 != block2:
for b1, b2 in zip(block1, block2):
if b1 != b2:
diff_count += 1

#
compare_time = time.time() - compare_start_time
total_time = time.time() - start_time

print(f"Total execution time: {total_time:.4f} seconds")

print(f"Total bytes compared: {len(content1):,.0f}")
if len(content1) > 0:
print(f"Percentage different: {(diff_count / len(content1)) * 100:.2f}%")
else:
print("Files are empty.")

print(f"Number of different bytes: {diff_count:,.0f}, diff_size= {diff_size:,.0f}")

except IOError as e:
print(f"Error reading files: {e}")

if __name__ == "__main__":
if len(sys.argv) < 3:
print("Usage: python script.py <file1> <file2>")
sys.exit(1)

file1_path = sys.argv[1]
file2_path = sys.argv[2]

print(f'Comparing files: "{file1_path}" and "{file2_path}"')
if os.path.exists(file1_path) == False:
print(f'File "{file1_path}" does not exist')
sys.exit(1)

if os.path.exists(file2_path) == False:
print(f'File "{file2_path}" does not exist')
sys.exit(1)

print(os.path.exists(file1_path), os.path.exists(file2_path))
diff_count = compare_binary_files(file1_path, file2_path)
# print(f"최종 : Number of different bytes: {diff_count}")

//