pub fn decode<T: AsRef<str>>(ew: T) -> Result<DecodingResult, DecodingError> {
    let mut split = ew.as_ref().split('?');
    let _ = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let charset = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let cte = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let cte_string = split.next().ok_or_else(|| DecodingError::MalformedInput)?;

    let (charset, lang) = if let Some(index) = charset.find('*') {
        let (charset, lang) = charset.split_at(index);
        (charset, &lang[1..])
    } else {
        (charset, "")
    };

    let mut defects = Vec::new();

    let charset = if charset == "latin-1" {
        // For some resason latin-1 is not repored
        Charset::for_label(b"latin1").unwrap()
    } else {
        match Charset::for_label(charset.as_bytes()) {
            Some(c) => c,
            None => {
                if charset != "unknown-8bit" {
                    defects.push(Defect::InvalidCharset {
                        charset: charset.into(),
                    })
                }
                Charset::Ascii
            }
        }
    };

    let cte = cte.to_lowercase();

    // Recover the original bytes and do CTE decoding.
    let (bstring, has_invalid_ascii) = Charset::Ascii.encode(cte_string);
    if has_invalid_ascii {
        defects.push(Defect::UndecodableBytes);
    }
    let (bstring, new_defects) = match cte.as_str() {
        "q" => (decode_q(bstring), Vec::new()),
        "b" => decode_b(bstring),
        _ => return Err(DecodingError::MalformedInput),
    };
    defects.extend_from_slice(&new_defects);

    // Turn the CTE decoded bytes into unicode.
    let (decoded, has_invalid_bytes) = charset.decode_without_bom_handling(&bstring);

    if has_invalid_bytes {
        defects.push(Defect::UndecodableBytes);
    }

    Ok(DecodingResult {
        decoded: decoded.into(),
        charset,
        lang: lang.into(),
        defects,
    })
}
/// Decode encoded word and return (string, charset, lang, defects) tuple.
///
/// An RFC 2047/2243 encoded word has the form: `=?charset*lang?cte?encoded_string?=`
///
/// where '*lang' may be omitted but the other parts may not be.
///
/// This function expects exactly such a string (that is, it does not check the
/// syntax and may raise errors if the string is not well formed), and returns
/// the encoded_string decoded first from its Content Transfer Encoding and
/// then from the resulting bytes into unicode using the specified charset.  If
/// the cte-decoded string does not successfully decode using the specified
/// character set, a defect is added to the defects list and the unknown octets
/// are replaced by the unicode 'unknown' character \\uFDFF.
///
/// The specified charset and language are returned.  The default for language,
/// which is rarely if ever encountered, is the empty string.
Decode encoded word and return (string, charset, lang, defects) tuple.
An RFC 2047/2243 encoded word has the form: `=?charset*lang?cte?encoded_string?=`



This function expects exactly such a string (that is, it does not check the
syntax and may raise errors if the string is not well formed), and returns
the encoded_string decoded first from its Content Transfer Encoding and
then from the resulting bytes into unicode using the specified charset.  If
the cte-decoded string does not successfully decode using the specified
character set, a defect is added to the defects list and the unknown octets
are replaced by the unicode 'unknown' character \\uFDFF.

The specified charset and language are returned.  The default for language,
which is rarely if ever encountered, is the empty string.
Decode encoded word and return ( string charset lang defects ) tuple . An RFC 2047 / 2243 encoded word has the form : ` = ?charset * lang?cte?encoded_string? = ` This function expects exactly such a string ( that is it does not check the syntax and may raise errors if the string is not well formed ) and returns the encoded_string decoded first from its Content Transfer Encoding and then from the resulting bytes into unicode using the specified charset . If the cte - decoded string does not successfully decode using the specified character set a defect is added to the defects list and the unknown octets are replaced by the unicode ' unknown ' character \\ uFDFF . The specified charset and language are returned . The default for language which is rarely if ever encountered is the empty string .
pub fn decode<T: AsRef<str>>(ew: T) -> Result<DecodingResult, DecodingError> {
    let mut split = ew.as_ref().split('?');
    let _ = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let charset = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let cte = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let cte_string = split.next().ok_or_else(|| DecodingError::MalformedInput)?;
    let (charset, lang) = if let Some(index) = charset.find('*') {
        let (charset, lang) = charset.split_at(index);
        (charset, &lang[1..])
    } else {
        (charset, "")
    };
    let mut defects = Vec::new();
    let charset = if charset == "latin-1" {
        // For some resason latin-1 is not repored
        Charset::for_label(b"latin1").unwrap()
    } else {
        match Charset::for_label(charset.as_bytes()) {
            Some(c) => c,
            None => {
                if charset != "unknown-8bit" {
                    defects.push(Defect::InvalidCharset {
                        charset: charset.into(),
                    })
                }
                Charset::Ascii
            }
        }
    };
    let cte = cte.to_lowercase();
    // Recover the original bytes and do CTE decoding.
    let (bstring, has_invalid_ascii) = Charset::Ascii.encode(cte_string);
    if has_invalid_ascii {
        defects.push(Defect::UndecodableBytes);
    }
    let (bstring, new_defects) = match cte.as_str() {
        "q" => (decode_q(bstring), Vec::new()),
        "b" => decode_b(bstring),
        _ => return Err(DecodingError::MalformedInput),
    };
    defects.extend_from_slice(&new_defects);
    // Turn the CTE decoded bytes into unicode.
    let (decoded, has_invalid_bytes) = charset.decode_without_bom_handling(&bstring);
    if has_invalid_bytes {
        defects.push(Defect::UndecodableBytes);
    }
    Ok(DecodingResult {
        decoded: decoded.into(),
        charset,
        lang: lang.into(),
        defects,
    })
}
pub fn decode < T : AsRef < str > > ( ew : T ) -> Result < DecodingResult , DecodingError > { let mut split = ew . as_ref ( ) . split ( '?' ) ; let _ = split . next ( ) . ok_or_else ( | | DecodingError :: MalformedInput ) ? ; let charset = split . next ( ) . ok_or_else ( | | DecodingError :: MalformedInput ) ? ; let cte = split . next ( ) . ok_or_else ( | | DecodingError :: MalformedInput ) ? ; let cte_string = split . next ( ) . ok_or_else ( | | DecodingError :: MalformedInput ) ? ; let ( charset , lang ) = if let Some ( index ) = charset . find ( '*' ) { let ( charset , lang ) = charset . split_at ( index ) ; ( charset , & lang [ 1 .. ] ) } else { ( charset , " " ) } ; let mut defects = Vec :: new ( ) ; let charset = if charset == " " { // For some resason latin-1 is not repored Charset :: for_label ( b" " ) . unwrap ( ) } else { match Charset :: for_label ( charset . as_bytes ( ) ) { Some ( c ) => c , None => { if charset != " " { defects . push ( Defect :: InvalidCharset { charset : charset . into ( ) , } ) } Charset :: Ascii } } } ; let cte = cte . to_lowercase ( ) ; // Recover the original bytes and do CTE decoding. let ( bstring , has_invalid_ascii ) = Charset :: Ascii . encode ( cte_string ) ; if has_invalid_ascii { defects . push ( Defect :: UndecodableBytes ) ; } let ( bstring , new_defects ) = match cte . as_str ( ) { " " => ( decode_q ( bstring ) , Vec :: new ( ) ) , " " => decode_b ( bstring ) , _ => return Err ( DecodingError :: MalformedInput ) , } ; defects . extend_from_slice ( & new_defects ) ; // Turn the CTE decoded bytes into unicode. let ( decoded , has_invalid_bytes ) = charset . decode_without_bom_handling ( & bstring ) ; if has_invalid_bytes { defects . push ( Defect :: UndecodableBytes ) ; } Ok ( DecodingResult { decoded : decoded . into ( ) , charset , lang : lang . into ( ) , defects , } ) }
Decode encoded word and return (string, charset, lang, defects) tuple.
Decode encoded word and return ( string charset lang defects ) tuple .
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