func IsBinary()

in pkg/linguist/util.go [198:234]

• 22 lines of code
• 8 McCabe index (conditional complexity)

func IsBinary(contents []byte) bool {
	// NOTE(tso): preliminary testing on this method of checking for binary
	// contents were promising, having fed a document consisting of all
	// utf-8 codepoints from 0000 to FFFF with satisfactory results. Thanks
	// to robpike.io/cmd/unicode:
	// ```
	// unicode -c $(seq 0 65535 | xargs printf "%04x ") | tr -d '\n' > unicode_test
	// ```
	//
	// However, the intentional presence of character escape codes to throw
	// this function off is entirely possible, as is, potentially, a binary
	// file consisting entirely of the 4 exceptions to the rule for the first
	// 512 bytes. It is also possible that more character escape codes need
	// to be added.
	//
	// Further analysis and real world testing of this is required.
	for n, b := range contents {
		if n >= 512 {
			break
		}
		if b < 32 {
			switch b {
			case 0:
				fallthrough
			case 9:
				fallthrough
			case 10:
				fallthrough
			case 13:
				continue
			default:
				return true
			}
		}
	}
	return false
}