8588414b14
Add seedList module for URL initialization, comprehensive SQL utilities for database analysis, and update project configuration.
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
package gemini
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"unicode/utf8"
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"gemini-grc/config"
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"git.antanst.com/antanst/xerrors"
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"golang.org/x/text/encoding/charmap"
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"golang.org/x/text/encoding/japanese"
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"golang.org/x/text/encoding/korean"
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"golang.org/x/text/transform"
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)
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var (
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ErrInputTooLarge = errors.New("input too large")
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ErrUTF8Conversion = errors.New("UTF-8 conversion error")
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)
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func BytesToValidUTF8(input []byte) (string, error) {
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if len(input) == 0 {
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return "", nil
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}
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maxSize := config.CONFIG.MaxResponseSize
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if maxSize == 0 {
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maxSize = 1024 * 1024 // Default 1MB for tests
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}
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if len(input) > maxSize {
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return "", xerrors.NewError(fmt.Errorf("BytesToValidUTF8: %w: %d bytes (max %d)", ErrInputTooLarge, len(input), maxSize), 0, "", false)
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}
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// Always remove NULL bytes first (before UTF-8 validity check)
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inputNoNull := bytes.ReplaceAll(input, []byte{byte(0)}, []byte{})
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if utf8.Valid(inputNoNull) {
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return string(inputNoNull), nil
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}
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encodings := []transform.Transformer{
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charmap.ISO8859_1.NewDecoder(),
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charmap.ISO8859_7.NewDecoder(),
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charmap.Windows1250.NewDecoder(), // Central European
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charmap.Windows1251.NewDecoder(), // Cyrillic
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charmap.Windows1252.NewDecoder(),
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charmap.Windows1256.NewDecoder(), // Arabic
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japanese.EUCJP.NewDecoder(), // Japanese
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korean.EUCKR.NewDecoder(), // Korean
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}
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// Still invalid Unicode. Try some encodings to convert to.
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// First successful conversion wins.
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var lastErr error
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for _, encoding := range encodings {
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reader := transform.NewReader(bytes.NewReader(inputNoNull), encoding)
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result, err := io.ReadAll(reader)
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if err != nil {
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lastErr = err
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continue
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}
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if utf8.Valid(result) {
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return string(result), nil
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}
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}
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return "", xerrors.NewError(fmt.Errorf("BytesToValidUTF8: %w (tried %d encodings): %w", ErrUTF8Conversion, len(encodings), lastErr), 0, "", false)
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}
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