org.apache.commons.codec.net
Class QuotedPrintableCodec

java.lang.Object
  org.apache.commons.codec.net.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 steamable 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.

Since:

1.3

Version:

$Id: QuotedPrintableCodec.java 798333 2009-07-27 23:41:58Z ggregory $

Author:

Apache Software Foundation

See Also:

RFC 1521 MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies

Constructor Summary

QuotedPrintableCodec()
Default constructor.

QuotedPrintableCodec(String charset)
Constructor which allows for the selection of a default charset

Method Summary

byte[]	decode(byte[] bytes) Decodes an array of quoted-printable characters into an array of original bytes.
Object	decode(Object pObject) Decodes a quoted-printable object into its original form.
String	decode(String pString) Decodes a quoted-printable string into its original form using the default string charset.
String	decode(String pString, String charset) Decodes a quoted-printable string into its original form using the specified string charset.
static byte[]	decodeQuotedPrintable(byte[] bytes) Decodes an array quoted-printable characters into an array of original bytes.
byte[]	encode(byte[] bytes) Encodes an array of bytes into an array of quoted-printable 7-bit characters.
Object	encode(Object pObject) Encodes an object into its quoted-printable safe form.
String	encode(String pString) Encodes a string into its quoted-printable form using the default string charset.
String	encode(String pString, String charset) Encodes a string into its quoted-printable form using the specified charset.
static byte[]	encodeQuotedPrintable(BitSet printable, byte[] bytes) Encodes an array of bytes into an array of quoted-printable 7-bit characters.
String	getDefaultCharset() Returns the default charset used for string decoding and encoding.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QuotedPrintableCodec

public QuotedPrintableCodec()

Default constructor.

QuotedPrintableCodec

public QuotedPrintableCodec(String charset)

Constructor which allows for the selection of a default charset

Parameters:

charset - the default string charset to use.

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 pString)
              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:

pString - string to convert to quoted-printable form

Returns:

quoted-printable string

Throws:

EncoderException - Thrown if quoted-printable encoding is unsuccessful

See Also:

getDefaultCharset()

decode

public String decode(String pString,
                     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:

pString - 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 pString)
              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:

pString - 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:

getDefaultCharset()

encode

public Object encode(Object pObject)
              throws EncoderException

Encodes an object into its quoted-printable safe form. Unsafe characters are escaped.

Specified by:

encode in interface Encoder

Parameters:

pObject - 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 pObject)
              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:

pObject - 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.

getDefaultCharset

public String getDefaultCharset()

Returns the default charset used for string decoding and encoding.

Returns:

the default string charset.

encode

public String encode(String pString,
                     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:

pString - string to convert to quoted-printable form

charset - the charset for pString

Returns:

quoted-printable string

Throws:

UnsupportedEncodingException - Thrown if the charset is not supported