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Class QuotedPrintableCodec

  • All Implemented Interfaces:
    BinaryDecoder, BinaryEncoder, Decoder, Encoder, StringDecoder, StringEncoder

    public class QuotedPrintableCodec
    extends Object
    implements BinaryEncoder, BinaryDecoder, StringEncoder, StringDecoder
    Codec for the Quoted-Printable section of RFC 1521.

    The Quoted-Printable encoding is intended to represent data that largely consists of octets that correspond to printable characters in the ASCII character set. It encodes the data in such a way that the resulting octets are unlikely to be modified by mail transport. If the data being encoded are mostly ASCII text, the encoded form of the data remains largely recognizable by humans. A body which is entirely ASCII may also be encoded in Quoted-Printable to ensure the integrity of the data should the message pass through a character- translating, and/or line-wrapping gateway.

    Note:

    Rules #3, #4, and #5 of the quoted-printable spec are not implemented yet because the complete quoted-printable spec does not lend itself well into the byte[] oriented codec framework. Complete the codec once the streamable codec framework is ready. The motivation behind providing the codec in a partial form is that it can already come in handy for those applications that do not require quoted-printable line formatting (rules #3, #4, #5), for instance Q codec.

    This class is immutable and thread-safe.

    Since:
    1.3
    Version:
    $Id: QuotedPrintableCodec.java 1429868 2013-01-07 16:08:05Z ggregory $
    See Also:
    RFC 1521 MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies
    • Constructor Detail

      • QuotedPrintableCodec

        public QuotedPrintableCodec()
        Default constructor, assumes default charset of Charsets.UTF_8
      • QuotedPrintableCodec

        public QuotedPrintableCodec(Charset charset)
        Constructor which allows for the selection of a default charset.
        Parameters:
        charset - the default string charset to use.
        Since:
        1.7
    • Method Detail

      • encodeQuotedPrintable

        public static final byte[] encodeQuotedPrintable(BitSet printable,
                                   byte[] bytes)
        Encodes an array of bytes into an array of quoted-printable 7-bit characters. Unsafe characters are escaped.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521 and is suitable for encoding binary data and unformatted text.

        Parameters:
        printable - bitset of characters deemed quoted-printable
        bytes - array of bytes to be encoded
        Returns:
        array of bytes containing quoted-printable data
      • decodeQuotedPrintable

        public static final byte[] decodeQuotedPrintable(byte[] bytes)
                                                  throws DecoderException
        Decodes an array quoted-printable characters into an array of original bytes. Escaped characters are converted back to their original representation.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521.

        Parameters:
        bytes - array of quoted-printable characters
        Returns:
        array of original bytes
        Throws:
        DecoderException - Thrown if quoted-printable decoding is unsuccessful
      • encode

        public byte[] encode(byte[] bytes)
        Encodes an array of bytes into an array of quoted-printable 7-bit characters. Unsafe characters are escaped.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521 and is suitable for encoding binary data and unformatted text.

        Specified by:
        encode in interface  BinaryEncoder
        Parameters:
        bytes - array of bytes to be encoded
        Returns:
        array of bytes containing quoted-printable data
      • decode

        public byte[] decode(byte[] bytes)
                      throws DecoderException
        Decodes an array of quoted-printable characters into an array of original bytes. Escaped characters are converted back to their original representation.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521.

        Specified by:
        decode in interface  BinaryDecoder
        Parameters:
        bytes - array of quoted-printable characters
        Returns:
        array of original bytes
        Throws:
        DecoderException - Thrown if quoted-printable decoding is unsuccessful
      • encode

        public String encode(String str)
                      throws EncoderException
        Encodes a string into its quoted-printable form using the default string charset. Unsafe characters are escaped.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521 and is suitable for encoding binary data.

        Specified by:
        encode in interface  StringEncoder
        Parameters:
        str - string to convert to quoted-printable form
        Returns:
        quoted-printable string
        Throws:
        EncoderException - Thrown if quoted-printable encoding is unsuccessful
        See Also:
        getCharset()
      • decode

        public String decode(String str,
                    Charset charset)
                      throws DecoderException
        Decodes a quoted-printable string into its original form using the specified string charset. Escaped characters are converted back to their original representation.
        Parameters:
        str - quoted-printable string to convert into its original form
        charset - the original string charset
        Returns:
        original string
        Throws:
        DecoderException - Thrown if quoted-printable decoding is unsuccessful
        Since:
        1.7
      • decode

        public String decode(String str,
                    String charset)
                      throws DecoderException,
                             UnsupportedEncodingException
        Decodes a quoted-printable string into its original form using the specified string charset. Escaped characters are converted back to their original representation.
        Parameters:
        str - quoted-printable string to convert into its original form
        charset - the original string charset
        Returns:
        original string
        Throws:
        DecoderException - Thrown if quoted-printable decoding is unsuccessful
        UnsupportedEncodingException - Thrown if charset is not supported
      • decode

        public String decode(String str)
                      throws DecoderException
        Decodes a quoted-printable string into its original form using the default string charset. Escaped characters are converted back to their original representation.
        Specified by:
        decode in interface  StringDecoder
        Parameters:
        str - quoted-printable string to convert into its original form
        Returns:
        original string
        Throws:
        DecoderException - Thrown if quoted-printable decoding is unsuccessful. Thrown if charset is not supported.
        See Also:
        getCharset()
      • encode

        public Object encode(Object obj)
                      throws EncoderException
        Encodes an object into its quoted-printable safe form. Unsafe characters are escaped.
        Specified by:
        encode in interface  Encoder
        Parameters:
        obj - string to convert to a quoted-printable form
        Returns:
        quoted-printable object
        Throws:
        EncoderException - Thrown if quoted-printable encoding is not applicable to objects of this type or if encoding is unsuccessful
      • decode

        public Object decode(Object obj)
                      throws DecoderException
        Decodes a quoted-printable object into its original form. Escaped characters are converted back to their original representation.
        Specified by:
        decode in interface  Decoder
        Parameters:
        obj - quoted-printable object to convert into its original form
        Returns:
        original object
        Throws:
        DecoderException - Thrown if the argument is not a String or byte[]. Thrown if a failure condition is encountered during the decode process.
      • getCharset

        public Charset getCharset()
        Gets the default charset name used for string decoding and encoding.
        Returns:
        the default charset name
        Since:
        1.7
      • getDefaultCharset

        public String getDefaultCharset()
        Gets the default charset name used for string decoding and encoding.
        Returns:
        the default charset name
      • encode

        public String encode(String str,
                    Charset charset)
        Encodes a string into its quoted-printable form using the specified charset. Unsafe characters are escaped.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521 and is suitable for encoding binary data and unformatted text.

        Parameters:
        str - string to convert to quoted-printable form
        charset - the charset for str
        Returns:
        quoted-printable string
        Since:
        1.7
      • encode

        public String encode(String str,
                    String charset)
                      throws UnsupportedEncodingException
        Encodes a string into its quoted-printable form using the specified charset. Unsafe characters are escaped.

        This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in RFC 1521 and is suitable for encoding binary data and unformatted text.

        Parameters:
        str - string to convert to quoted-printable form
        charset - the charset for str
        Returns:
        quoted-printable string
        Throws:
        UnsupportedEncodingException - Thrown if the charset is not supported

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