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master
detect/codec/base64.go
39 строк
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bplaxco
Percent/URL Decoding Support (#1831)
12 май 2025, 19:22
Не верифицирован
12 май 2025, 19:22
78eebac
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package codec import ( "encoding/base64" ) // likelyBase64Chars is a set of characters that you would expect to find at // least one of in base64 encoded data. This risks missing about 1% of // base64 encoded data that doesn't contain these characters, but gives you // the performance gain of not trying to decode a lot of long symbols in code. var likelyBase64Chars = make([]bool, 256) func init() { for _, c := range `0123456789+/-_` { likelyBase64Chars[c] = true } } // decodeBase64 decodes base64 encoded printable ASCII characters func decodeBase64(encodedValue string) string { // Exit early if it doesn't seem like base64 if !hasByte(encodedValue, likelyBase64Chars) { return "" } // Try standard base64 decoding decodedValue, err := base64.StdEncoding.DecodeString(encodedValue) if err == nil && isPrintableASCII(decodedValue) { return string(decodedValue) } // Try base64url decoding decodedValue, err = base64.RawURLEncoding.DecodeString(encodedValue) if err == nil && isPrintableASCII(decodedValue) { return string(decodedValue) } return "" }