pstuifzand/ekster

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)
}