writer2latex.util

Class Base64

java.lang.Object

writer2latex.util.Base64

public class Base64
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Base64.InputStream A Base64.InputStream will read data from another java.io.InputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.
static class	Base64.OutputStream A Base64.OutputStream will write data to another java.io.OutputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DECODE Specify decoding.
static int	DONT_BREAK_LINES Don't break lines when encoding (violates strict Base64 specification)
static int	ENCODE Specify encoding.
static int	GZIP Specify that data should be gzip-compressed.
static int	NO_OPTIONS No options specified.
static int	ORDERED Encode using the special "ordered" dialect of Base64 described here: http://www.faqs.org/qa/rfcc-1940.html.
static int	URL_SAFE Encode using Base64-like encoding that is URL- and Filename-safe as described in Section 4 of RFC3548: http://www.faqs.org/rfcs/rfc3548.html.

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	decode(byte[] source, int off, int len, int options) Very low-level access to decoding ASCII characters in the form of a byte array.
static byte[]	decode(java.lang.String s) Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.
static byte[]	decode(java.lang.String s, int options) Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.
static boolean	decodeFileToFile(java.lang.String infile, java.lang.String outfile) Reads infile and decodes it to outfile.
static byte[]	decodeFromFile(java.lang.String filename) Convenience method for reading a base64-encoded file and decoding it.
static boolean	decodeToFile(java.lang.String dataToDecode, java.lang.String filename) Convenience method for decoding data to a file.
static java.lang.Object	decodeToObject(java.lang.String encodedObject) Attempts to decode Base64 data and deserialize a Java Object within.
static java.lang.String	encodeBytes(byte[] source) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int options) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int off, int len) Encodes a byte array into Base64 notation.
static java.lang.String	encodeBytes(byte[] source, int off, int len, int options) Encodes a byte array into Base64 notation.
static boolean	encodeFileToFile(java.lang.String infile, java.lang.String outfile) Reads infile and encodes it to outfile.
static java.lang.String	encodeFromFile(java.lang.String filename) Convenience method for reading a binary file and base64-encoding it.
static java.lang.String	encodeObject(java.io.Serializable serializableObject) Serializes an object and returns the Base64-encoded version of that serialized object.
static java.lang.String	encodeObject(java.io.Serializable serializableObject, int options) Serializes an object and returns the Base64-encoded version of that serialized object.
static boolean	encodeToFile(byte[] dataToEncode, java.lang.String filename) Convenience method for encoding data to a file.
static void	main(java.lang.String[] args) Encodes or decodes two files from the command line; feel free to delete this method (in fact you probably should) if you're embedding this code into a larger program.

Methods inherited from class java.lang.Object

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

Field Detail

NO_OPTIONS

public static final int NO_OPTIONS

No options specified. Value is zero.

See Also:

Constant Field Values

ENCODE

public static final int ENCODE

Specify encoding.

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Constant Field Values

DECODE

public static final int DECODE

Specify decoding.

See Also:

Constant Field Values

GZIP

public static final int GZIP

Specify that data should be gzip-compressed.

See Also:

Constant Field Values

DONT_BREAK_LINES

public static final int DONT_BREAK_LINES

Don't break lines when encoding (violates strict Base64 specification)

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Constant Field Values

URL_SAFE

public static final int URL_SAFE

Encode using Base64-like encoding that is URL- and Filename-safe as described in Section 4 of RFC3548: http://www.faqs.org/rfcs/rfc3548.html. It is important to note that data encoded this way is not officially valid Base64, or at the very least should not be called Base64 without also specifying that is was encoded using the URL- and Filename-safe dialect.

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Constant Field Values

ORDERED

public static final int ORDERED

Encode using the special "ordered" dialect of Base64 described here: http://www.faqs.org/qa/rfcc-1940.html.

See Also:

Constant Field Values

Method Detail

main

public static final void main(java.lang.String[] args)

Encodes or decodes two files from the command line; feel free to delete this method (in fact you probably should) if you're embedding this code into a larger program.

encodeObject

public static java.lang.String encodeObject(java.io.Serializable serializableObject)

Serializes an object and returns the Base64-encoded version of that serialized object. If the object cannot be serialized or there is another error, the method will return null. The object is not GZip-compressed before being encoded.

Parameters:

serializableObject - The object to encode

Returns:

The Base64-encoded object

Since:

1.4

encodeObject

public static java.lang.String encodeObject(java.io.Serializable serializableObject,
                            int options)

Serializes an object and returns the Base64-encoded version of that serialized object. If the object cannot be serialized or there is another error, the method will return null.

Valid options:

   GZIP: gzip-compresses object before encoding it.
   DONT_BREAK_LINES: don't break lines at 76 characters
     Note: Technically, this makes your encoding non-compliant.
 

Example: encodeObject( myObj, Base64.GZIP ) or

Example: encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

serializableObject - The object to encode

options - Specified options

Returns:

The Base64-encoded object

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

encodeBytes

public static java.lang.String encodeBytes(byte[] source)

Encodes a byte array into Base64 notation. Does not GZip-compress data.

Parameters:

source - The data to convert

Since:

1.4

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                           int options)

Encodes a byte array into Base64 notation.

Valid options:

   GZIP: gzip-compresses object before encoding it.
   DONT_BREAK_LINES: don't break lines at 76 characters
     Note: Technically, this makes your encoding non-compliant.
 

Example: encodeBytes( myData, Base64.GZIP ) or

Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

source - The data to convert

options - Specified options

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                           int off,
                           int len)

Encodes a byte array into Base64 notation. Does not GZip-compress data.

Parameters:

source - The data to convert

off - Offset in array where conversion should begin

len - Length of data to convert

Since:

1.4

encodeBytes

public static java.lang.String encodeBytes(byte[] source,
                           int off,
                           int len,
                           int options)

Encodes a byte array into Base64 notation.

Valid options:

   GZIP: gzip-compresses object before encoding it.
   DONT_BREAK_LINES: don't break lines at 76 characters
     Note: Technically, this makes your encoding non-compliant.
 

Example: encodeBytes( myData, Base64.GZIP ) or

Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )

Parameters:

source - The data to convert

off - Offset in array where conversion should begin

len - Length of data to convert

options - Specified options

options - alphabet type is pulled from this (standard, url-safe, ordered)

Since:

2.0

See Also:

GZIP, DONT_BREAK_LINES

decode

public static byte[] decode(byte[] source,
            int off,
            int len,
            int options)

Very low-level access to decoding ASCII characters in the form of a byte array. Does not support automatically gunzipping or any other "fancy" features.

Parameters:

source - The Base64 encoded data

off - The offset of where to begin decoding

len - The length of characters to decode

Returns:

decoded data

Since:

1.3

decode

public static byte[] decode(java.lang.String s)

Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.

Parameters:

s - the string to decode

Returns:

the decoded data

Since:

1.4

decode

public static byte[] decode(java.lang.String s,
            int options)

Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.

Parameters:

s - the string to decode

options - encode options such as URL_SAFE

Returns:

the decoded data

Since:

1.4

decodeToObject

public static java.lang.Object decodeToObject(java.lang.String encodedObject)

Attempts to decode Base64 data and deserialize a Java Object within. Returns null if there was an error.

Parameters:

encodedObject - The Base64 data to decode

Returns:

The decoded and deserialized object

Since:

1.5

encodeToFile

public static boolean encodeToFile(byte[] dataToEncode,
                   java.lang.String filename)

Convenience method for encoding data to a file.

Parameters:

dataToEncode - byte array of data to encode in base64 form

filename - Filename for saving encoded data

Returns:

true if successful, false otherwise

Since:

2.1

decodeToFile

public static boolean decodeToFile(java.lang.String dataToDecode,
                   java.lang.String filename)

Convenience method for decoding data to a file.

Parameters:

dataToDecode - Base64-encoded data as a string

filename - Filename for saving decoded data

Returns:

true if successful, false otherwise

Since:

2.1

decodeFromFile

public static byte[] decodeFromFile(java.lang.String filename)

Convenience method for reading a base64-encoded file and decoding it.

Parameters:

filename - Filename for reading encoded data

Returns:

decoded byte array or null if unsuccessful

Since:

2.1

encodeFromFile

public static java.lang.String encodeFromFile(java.lang.String filename)

Convenience method for reading a binary file and base64-encoding it.

Parameters:

filename - Filename for reading binary data

Returns:

base64-encoded string or null if unsuccessful

Since:

2.1

encodeFileToFile

public static boolean encodeFileToFile(java.lang.String infile,
                       java.lang.String outfile)

Reads infile and encodes it to outfile.

Parameters:

infile - Input file

outfile - Output file

Returns:

true if the operation is successful

Since:

2.2

decodeFileToFile

public static boolean decodeFileToFile(java.lang.String infile,
                       java.lang.String outfile)

Reads infile and decodes it to outfile.

Parameters:

infile - Input file

outfile - Output file

Returns:

true if the operation is successful

Since:

2.2