brianonn · November 9, 2025 05:04 · brianonn · Nov 9, 2025
diff --git a/sfv_verify.py b/sfv_verify.py
 #!/usr/bin/env python3
 """
 SFV (Simple File Verification) file validator.
 Reads an SFV file and verifies the CRC32 checksum of each listed file.
 """

 import sys
 import os
 import zlib


 def calculate_crc32(filepath):
    """
    Calculate the CRC32 checksum for a file.
    Returns the checksum as an 8-character uppercase hex string.
    """
    crc = 0
    try:
        with open(filepath, 'rb') as f:
            # Read file in chunks to handle large files efficiently
            while chunk := f.read(65536):  # 64KB chunks
                crc = zlib.crc32(chunk, crc)
        
        # Convert to unsigned 32-bit value and format as 8-digit hex
        return format(crc & 0xFFFFFFFF, '08X')
    except IOError as e:
        raise IOError(f"Error reading file '{filepath}': {e}")


 def parse_sfv_line(line):
    """
    Parse a line from an SFV file.
    Returns (filename, expected_crc) tuple or None if it's a comment/empty line.
    """
    # Strip whitespace
    line = line.strip()
    
    # Skip empty lines and comments (lines starting with semicolon)
    if not line or line.startswith(';'):
        return None
    
    # Split on whitespace - last token should be the CRC32
    parts = line.rsplit(None, 1)
    
    if len(parts) != 2:
        return None
    
    filename, crc = parts
    
    # CRC should be 8 hex characters
    if len(crc) == 8 and all(c in '0123456789ABCDEFabcdef' for c in crc):
        return filename, crc.upper()
    
    return None


 def verify_sfv_file(sfv_filepath):
    """
    Read and verify all files listed in the SFV file.
    Returns tuple of (total_files, passed_files, failed_files).
    """
    if not os.path.exists(sfv_filepath):
        print(f"ERROR: SFV file '{sfv_filepath}' not found")
        return 0, 0, 0
    
    # Get the directory containing the SFV file to resolve relative paths
    sfv_dir = os.path.dirname(os.path.abspath(sfv_filepath))
    
    total = 0
    passed = 0
    failed = 0
    
    try:
        with open(sfv_filepath, 'r', encoding='utf-8', errors='replace') as sfv:
            for line_num, line in enumerate(sfv, 1):
                result = parse_sfv_line(line)
                
                if result is None:
                    continue
                
                filename, expected_crc = result
                total += 1
                
                # Resolve file path relative to SFV file location
                filepath = os.path.join(sfv_dir, filename)
                
                # Check if file exists
                if not os.path.exists(filepath):
                    print(f"FAIL: File not found: {filename}")
                    failed += 1
                    continue
                
                # Check if it's a directory
                if os.path.isdir(filepath):
                    print(f"FAIL: Path is a directory, not a file: {filename}")
                    failed += 1
                    continue
                
                # Calculate CRC32
                try:
                    calculated_crc = calculate_crc32(filepath)
                    
                    if calculated_crc == expected_crc:
                        print(f"OK:   {filename}")
                        passed += 1
                    else:
                        print(f"FAIL: {filename}")
                        print(f"      Expected: {expected_crc}, Got: {calculated_crc}")
                        failed += 1
                        
                except IOError as e:
                    print(f"FAIL: {filename}")
                    print(f"      {e}")
                    failed += 1
    
    except IOError as e:
        print(f"ERROR: Cannot read SFV file '{sfv_filepath}': {e}")
        return 0, 0, 0
    
    return total, passed, failed


 def main():
    if len(sys.argv) != 2:
        print("Usage: python sfv_validator.py <sfv_file>")
        print("Example: python sfv_validator.py files.sfv")
        sys.exit(1)
    
    sfv_file = sys.argv[1]
    
    print(f"Verifying files listed in: {sfv_file}")
    print("-" * 60)
    
    total, passed, failed = verify_sfv_file(sfv_file)
    
    print("-" * 60)
    if total == 0:
        print("No files found to verify in SFV file")
    else:
        print(f"Total: {total} files")
        print(f"Passed: {passed} files")
        print(f"Failed: {failed} files")
        
        if failed == 0:
            print("\nAll files verified successfully!")
            sys.exit(0)
        else:
            print(f"\nVerification failed for {failed} file(s)")
            sys.exit(1)


 if __name__ == "__main__":
    main()
	#!/usr/bin/env python3
	"""
	SFV (Simple File Verification) file validator.
	Reads an SFV file and verifies the CRC32 checksum of each listed file.
	"""

	import sys
	import os
	import zlib


	def calculate_crc32(filepath):
	"""
	Calculate the CRC32 checksum for a file.
	Returns the checksum as an 8-character uppercase hex string.
	"""
	crc = 0
	try:
	with open(filepath, 'rb') as f:
	# Read file in chunks to handle large files efficiently
	while chunk := f.read(65536): # 64KB chunks
	crc = zlib.crc32(chunk, crc)

	# Convert to unsigned 32-bit value and format as 8-digit hex
	return format(crc & 0xFFFFFFFF, '08X')
	except IOError as e:
	raise IOError(f"Error reading file '{filepath}': {e}")


	def parse_sfv_line(line):
	"""
	Parse a line from an SFV file.
	Returns (filename, expected_crc) tuple or None if it's a comment/empty line.
	"""
	# Strip whitespace
	line = line.strip()

	# Skip empty lines and comments (lines starting with semicolon)
	if not line or line.startswith(';'):
	return None

	# Split on whitespace - last token should be the CRC32
	parts = line.rsplit(None, 1)

	if len(parts) != 2:
	return None

	filename, crc = parts

	# CRC should be 8 hex characters
	if len(crc) == 8 and all(c in '0123456789ABCDEFabcdef' for c in crc):
	return filename, crc.upper()

	return None


	def verify_sfv_file(sfv_filepath):
	"""
	Read and verify all files listed in the SFV file.
	Returns tuple of (total_files, passed_files, failed_files).
	"""
	if not os.path.exists(sfv_filepath):
	print(f"ERROR: SFV file '{sfv_filepath}' not found")
	return 0, 0, 0

	# Get the directory containing the SFV file to resolve relative paths
	sfv_dir = os.path.dirname(os.path.abspath(sfv_filepath))

	total = 0
	passed = 0
	failed = 0

	try:
	with open(sfv_filepath, 'r', encoding='utf-8', errors='replace') as sfv:
	for line_num, line in enumerate(sfv, 1):
	result = parse_sfv_line(line)

	if result is None:
	continue

	filename, expected_crc = result
	total += 1

	# Resolve file path relative to SFV file location
	filepath = os.path.join(sfv_dir, filename)

	# Check if file exists
	if not os.path.exists(filepath):
	print(f"FAIL: File not found: {filename}")
	failed += 1
	continue

	# Check if it's a directory
	if os.path.isdir(filepath):
	print(f"FAIL: Path is a directory, not a file: {filename}")
	failed += 1
	continue

	# Calculate CRC32
	try:
	calculated_crc = calculate_crc32(filepath)

	if calculated_crc == expected_crc:
	print(f"OK: {filename}")
	passed += 1
	else:
	print(f"FAIL: {filename}")
	print(f" Expected: {expected_crc}, Got: {calculated_crc}")
	failed += 1

	except IOError as e:
	print(f"FAIL: {filename}")
	print(f" {e}")
	failed += 1

	except IOError as e:
	print(f"ERROR: Cannot read SFV file '{sfv_filepath}': {e}")
	return 0, 0, 0

	return total, passed, failed


	def main():
	if len(sys.argv) != 2:
	print("Usage: python sfv_validator.py <sfv_file>")
	print("Example: python sfv_validator.py files.sfv")
	sys.exit(1)

	sfv_file = sys.argv[1]

	print(f"Verifying files listed in: {sfv_file}")
	print("-" * 60)

	total, passed, failed = verify_sfv_file(sfv_file)

	print("-" * 60)
	if total == 0:
	print("No files found to verify in SFV file")
	else:
	print(f"Total: {total} files")
	print(f"Passed: {passed} files")
	print(f"Failed: {failed} files")

	if failed == 0:
	print("\nAll files verified successfully!")
	sys.exit(0)
	else:
	print(f"\nVerification failed for {failed} file(s)")
	sys.exit(1)


	if __name__ == "__main__":
	main()
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