Common Errors and Solutions

Invalid CAB Signature

Error: Cabriolet::InvalidFormatError: Invalid CAB signature

Cause: File is not a valid CAB archive or is corrupted

Solutions:

# Verify file is actually a CAB
File.open('file.cab', 'rb') do |f|
  signature = f.read(4)
  if signature != "MSCF"
    puts "Not a CAB file (signature: #{signature.inspect})"
  end
end

Checksum Mismatch

Error: Cabriolet::ChecksumError: Data block checksum mismatch

Cause: Corrupted data or transmission error

Solutions:

# Skip checksum validation
cab = Cabriolet::CAB::Parser.new(skip_checksum: true).parse('file.cab')

Unsupported Compression

Error: Cabriolet::UnsupportedCompressionError

Cause: Archive uses Quantum compression (rarely supported)

Solution: Extract using official Microsoft tools first

Out of Memory

Error: NoMemoryError

Cause: LZX with large window or insufficient RAM

Solutions:

  • Use smaller window size

  • Increase available memory

  • Process files individually

File Not Found

Error: Errno::ENOENT

Cause: Path doesn’t exist or incorrect working directory

Solution: Use absolute paths or verify working directory

See also