rss/ISO-8859-1.go
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package rss
import (
"bytes"
"errors"
"io"
"unicode/utf8"
)
// ISO-8859-1 support
type charsetISO88591er struct {
r io.ByteReader
buf *bytes.Buffer
}
func newCharsetISO88591(r io.Reader) *charsetISO88591er {
buf := bytes.NewBuffer(make([]byte, 0, utf8.UTFMax))
return &charsetISO88591er{r.(io.ByteReader), buf}
}
func (cs *charsetISO88591er) ReadByte() (b byte, err error) {
// http://unicode.org/Public/MAPPINGS/ISO8859/8859-1.TXT
// Date: 1999 July 27; Last modified: 27-Feb-2001 05:08
if cs.buf.Len() <= 0 {
r, err := cs.r.ReadByte()
if err != nil {
return 0, err
}
if r < utf8.RuneSelf {
return r, nil
}
cs.buf.WriteRune(rune(r))
}
return cs.buf.ReadByte()
}
func (cs *charsetISO88591er) Read(p []byte) (int, error) {
// Use ReadByte method.
return 0, errors.New("Use ReadByte()")
}
func isCharsetISO88591(charset string) bool {
// http://www.iana.org/assignments/character-sets
// (last updated 2010-11-04)
names := []string{
// Name
"ISO_8859-1:1987",
// Alias (preferred MIME name)
"ISO-8859-1",
// Aliases
"iso-ir-100",
"ISO_8859-1",
"latin1",
"l1",
"IBM819",
"CP819",
"csISOLatin1",
}
return isCharset(charset, names)
}