/
decoder.go
42 lines (36 loc) · 945 Bytes
/
decoder.go
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package laptimer
import (
"encoding/xml"
"fmt"
"io"
"golang.org/x/text/encoding/ianaindex"
)
// Decoder reads Harry's LapTimer xml data files.
type Decoder struct {
r io.Reader
}
// NewDecoder returns a fully initialised encoder which reads
// data from r.
func NewDecoder(r io.Reader) *Decoder {
return &Decoder{r: r}
}
// Decode decodes data from the stream into v.
func (d *Decoder) Decode(v any) error {
dec := xml.NewDecoder(d.r)
dec.CharsetReader = func(charset string, r io.Reader) (io.Reader, error) {
enc, err := ianaindex.IANA.Encoding(charset)
if err != nil {
return nil, fmt.Errorf("charset %s: %w", charset, err)
}
if enc == nil {
// Assume it's compatible with (a subset of) UTF-8 encoding
// Bug: https://github.com/golang/go/issues/19421
return r, nil
}
return enc.NewDecoder().Reader(r), nil
}
if err := dec.Decode(v); err != nil {
return fmt.Errorf("decode: %w", err)
}
return nil
}