35 lines
866 B
Go
35 lines
866 B
Go
package gemini
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"unicode/utf8"
|
|
|
|
"golang.org/x/text/encoding/charmap"
|
|
"golang.org/x/text/transform"
|
|
)
|
|
|
|
func EnsureValidUTF8(input []byte) (string, error) {
|
|
// Remove NULL byte 0x00
|
|
inputNoNull := bytes.ReplaceAll(input, []byte{0}, nil)
|
|
isValidUTF8 := utf8.Valid(inputNoNull)
|
|
if !isValidUTF8 {
|
|
encodings := []transform.Transformer{
|
|
charmap.ISO8859_1.NewDecoder(), // First try ISO8859-1
|
|
charmap.Windows1252.NewDecoder(), // Then try Windows-1252, etc
|
|
// TODO: Try more encodings?
|
|
}
|
|
// First successful conversion wins
|
|
for _, encoding := range encodings {
|
|
reader := transform.NewReader(bytes.NewReader(inputNoNull), encoding)
|
|
result, err := io.ReadAll(reader)
|
|
if err != nil {
|
|
return "", fmt.Errorf("UTF-8 error: %w", err)
|
|
}
|
|
return string(result), nil
|
|
}
|
|
}
|
|
return string(inputNoNull), nil
|
|
}
|