Class Base64
- java.lang.Object
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- ca.cgjennings.io.Base64
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public class Base64 extends java.lang.Object
A utility class for working with Base64 encoding.This is based on public domain code written by Robert Harder. The main change is that the inner classes have been renamed, mainly because my IDE wants to add imports for them whenever I use an InputStream or OutputStream. Since this refactoring might cause conflicts with other code that also uses this class, this version has been moved to a different package.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
Base64.Base64InputStream
ABase64.Base64InputStream
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.Base64OutputStream
ABase64.Base64OutputStream
will write data to another java.io.OutputStream, given in the constructor, and encode/decode to/from Base64 notation on the fly.
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Field Summary
Fields Modifier and Type Field Description static int
DECODE
Specify decoding in first bit.static int
DO_BREAK_LINES
Do break lines when encoding.static int
DONT_GUNZIP
Specify that gzipped data should not be automatically gunzipped.static int
ENCODE
Specify encoding in first bit.static int
GZIP
Specify that data should be gzip-compressed in second bit.static int
NO_OPTIONS
No options specified.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.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static byte[]
decode(byte[] source)
Low-level access to decoding ASCII characters in the form of a byte array.static byte[]
decode(byte[] source, int off, int len, int options)
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 void
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 void
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.Object
decodeToObject(java.lang.String encodedObject, int options, java.lang.ClassLoader loader)
Attempts to decode Base64 data and deserialize a Java Object within.static void
encode(java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded)
Performs Base64 encoding on theraw
ByteBuffer, writing it to theencoded
ByteBuffer.static void
encode(java.nio.ByteBuffer raw, java.nio.CharBuffer encoded)
Performs Base64 encoding on theraw
ByteBuffer, writing it to theencoded
CharBuffer.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 byte[]
encodeBytesToBytes(byte[] source)
Similar toencodeBytes(byte[])
but returns a byte array instead of instantiating a String.static byte[]
encodeBytesToBytes(byte[] source, int off, int len, int options)
Similar toencodeBytes(byte[], int, int, int)
but returns a byte array instead of instantiating a String.static void
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 void
encodeToFile(byte[] dataToEncode, java.lang.String filename)
Convenience method for encoding data to a file.
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Field Detail
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NO_OPTIONS
public static final int NO_OPTIONS
No options specified. Value is zero.- See Also:
- Constant Field Values
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ENCODE
public static final int ENCODE
Specify encoding in first bit. Value is one.- See Also:
- Constant Field Values
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DECODE
public static final int DECODE
Specify decoding in first bit. Value is zero.- See Also:
- Constant Field Values
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GZIP
public static final int GZIP
Specify that data should be gzip-compressed in second bit. Value is two.- See Also:
- Constant Field Values
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DONT_GUNZIP
public static final int DONT_GUNZIP
Specify that gzipped data should not be automatically gunzipped.- See Also:
- Constant Field Values
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DO_BREAK_LINES
public static final int DO_BREAK_LINES
Do break lines when encoding. Value is 8.- See Also:
- Constant Field Values
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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 it is was encoded using the URL- and Filename-safe dialect.- See Also:
- Constant Field Values
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Method Detail
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encode
public static void encode(java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded)
Performs Base64 encoding on theraw
ByteBuffer, writing it to theencoded
ByteBuffer. This is an experimental feature. Currently it does not pass along any options (such asDO_BREAK_LINES
orGZIP
.- Parameters:
raw
- input bufferencoded
- output buffer- Since:
- 2.3
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encode
public static void encode(java.nio.ByteBuffer raw, java.nio.CharBuffer encoded)
Performs Base64 encoding on theraw
ByteBuffer, writing it to theencoded
CharBuffer. This is an experimental feature. Currently it does not pass along any options (such asDO_BREAK_LINES
orGZIP
.- Parameters:
raw
- input bufferencoded
- output buffer- Since:
- 2.3
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encodeObject
public static java.lang.String encodeObject(java.io.Serializable serializableObject) throws java.io.IOException
Serializes an object and returns the Base64-encoded version of that serialized object. The object is not GZip-compressed before being encoded.- Parameters:
serializableObject
- The object to encode- Returns:
- The Base64-encoded object
- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if serializedObject is null- Since:
- 1.4
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encodeObject
public static java.lang.String encodeObject(java.io.Serializable serializableObject, int options) throws java.io.IOException
Serializes an object and returns the Base64-encoded version of that serialized object.Example options:
GZIP: gzip-compresses object before encoding it. DO_BREAK_LINES: break lines at 76 characters
Example:
encodeObject( myObj, Base64.GZIP )
orExample:
encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )
- Parameters:
serializableObject
- The object to encodeoptions
- Specified options- Returns:
- The Base64-encoded object
- Throws:
java.io.IOException
- if there is an error- Since:
- 2.0
- See Also:
GZIP
,DO_BREAK_LINES
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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- Returns:
- The data in Base64-encoded form
- Throws:
java.lang.NullPointerException
- if source array is null- Since:
- 1.4
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encodeBytes
public static java.lang.String encodeBytes(byte[] source, int options) throws java.io.IOException
Encodes a byte array into Base64 notation.Example options:
GZIP: gzip-compresses object before encoding it. DO_BREAK_LINES: break lines at 76 characters Note: Technically, this makes your encoding non-compliant.
Example:
encodeBytes( myData, Base64.GZIP )
orExample:
encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )
As of v 2.3, if there is an error with the GZIP stream, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned a null value, but in retrospect that's a pretty poor way to handle it.
- Parameters:
source
- The data to convertoptions
- Specified options- Returns:
- The Base64-encoded data as a String
- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if source array is null- Since:
- 2.0
- See Also:
GZIP
,DO_BREAK_LINES
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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.As of v 2.3, if there is an error, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned a null value, but in retrospect that's a pretty poor way to handle it.
- Parameters:
source
- The data to convertoff
- Offset in array where conversion should beginlen
- Length of data to convert- Returns:
- The Base64-encoded data as a String
- Throws:
java.lang.NullPointerException
- if source array is nulljava.lang.IllegalArgumentException
- if source array, offset, or length are invalid- Since:
- 1.4
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encodeBytes
public static java.lang.String encodeBytes(byte[] source, int off, int len, int options) throws java.io.IOException
Encodes a byte array into Base64 notation.Example options:
GZIP: gzip-compresses object before encoding it. DO_BREAK_LINES: break lines at 76 characters Note: Technically, this makes your encoding non-compliant.
Example:
encodeBytes( myData, Base64.GZIP )
orExample:
encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )
As of v 2.3, if there is an error with the GZIP stream, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned a null value, but in retrospect that's a pretty poor way to handle it.
- Parameters:
source
- The data to convertoff
- Offset in array where conversion should beginlen
- Length of data to convertoptions
- Specified options- Returns:
- The Base64-encoded data as a String
- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if source array is nulljava.lang.IllegalArgumentException
- if source array, offset, or length are invalid- Since:
- 2.0
- See Also:
GZIP
,DO_BREAK_LINES
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encodeBytesToBytes
public static byte[] encodeBytesToBytes(byte[] source)
Similar toencodeBytes(byte[])
but returns a byte array instead of instantiating a String. This is more efficient if you're working with I/O streams and have large data sets to encode.- Parameters:
source
- The data to convert- Returns:
- The Base64-encoded data as a byte[] (of ASCII characters)
- Throws:
java.lang.NullPointerException
- if source array is null- Since:
- 2.3.1
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encodeBytesToBytes
public static byte[] encodeBytesToBytes(byte[] source, int off, int len, int options) throws java.io.IOException
Similar toencodeBytes(byte[], int, int, int)
but returns a byte array instead of instantiating a String. This is more efficient if you're working with I/O streams and have large data sets to encode.- Parameters:
source
- The data to convertoff
- Offset in array where conversion should beginlen
- Length of data to convertoptions
- Specified options- Returns:
- The Base64-encoded data as a String
- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if source array is nulljava.lang.IllegalArgumentException
- if source array, offset, or length are invalid- Since:
- 2.3.1
- See Also:
GZIP
,DO_BREAK_LINES
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decode
public static byte[] decode(byte[] source) throws java.io.IOException
Low-level access to decoding ASCII characters in the form of a byte array. Ignores GUNZIP option, if it's set. This is not generally a recommended method, although it is used internally as part of the decoding process. Special case: if len = 0, an empty array is returned. Still, if you need more speed and reduced memory footprint (and aren't gzipping), consider this method.- Parameters:
source
- The Base64 encoded data- Returns:
- decoded data
- Throws:
java.io.IOException
- Since:
- 2.3.1
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decode
public static byte[] decode(byte[] source, int off, int len, int options) throws java.io.IOException
Low-level access to decoding ASCII characters in the form of a byte array. Ignores GUNZIP option, if it's set. This is not generally a recommended method, although it is used internally as part of the decoding process. Special case: if len = 0, an empty array is returned. Still, if you need more speed and reduced memory footprint (and aren't gzipping), consider this method.- Parameters:
source
- The Base64 encoded dataoff
- The offset of where to begin decodinglen
- The length of characters to decodeoptions
- Can specify options such as alphabet type to use- Returns:
- decoded data
- Throws:
java.io.IOException
- If bogus characters exist in source data- Since:
- 1.3
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decode
public static byte[] decode(java.lang.String s) throws java.io.IOException
Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.- Parameters:
s
- the string to decode- Returns:
- the decoded data
- Throws:
java.io.IOException
- If there is a problem- Since:
- 1.4
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decode
public static byte[] decode(java.lang.String s, int options) throws java.io.IOException
Decodes data from Base64 notation, automatically detecting gzip-compressed data and decompressing it.- Parameters:
s
- the string to decodeoptions
- encode options such as URL_SAFE- Returns:
- the decoded data
- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if s is null- Since:
- 1.4
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decodeToObject
public static java.lang.Object decodeToObject(java.lang.String encodedObject) throws java.io.IOException, java.lang.ClassNotFoundException
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
- Throws:
java.lang.NullPointerException
- if encodedObject is nulljava.io.IOException
- if there is a general errorjava.lang.ClassNotFoundException
- if the decoded object is of a class that cannot be found by the JVM- Since:
- 1.5
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decodeToObject
public static java.lang.Object decodeToObject(java.lang.String encodedObject, int options, java.lang.ClassLoader loader) throws java.io.IOException, java.lang.ClassNotFoundException
Attempts to decode Base64 data and deserialize a Java Object within. Returns null if there was an error. If loader is not null, it will be the class loader used when deserializing.- Parameters:
encodedObject
- The Base64 data to decodeoptions
- Various parameters related to decodingloader
- Optional class loader to use in deserializing classes.- Returns:
- The decoded and deserialized object
- Throws:
java.lang.NullPointerException
- if encodedObject is nulljava.io.IOException
- if there is a general errorjava.lang.ClassNotFoundException
- if the decoded object is of a class that cannot be found by the JVM- Since:
- 2.3.4
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encodeToFile
public static void encodeToFile(byte[] dataToEncode, java.lang.String filename) throws java.io.IOException
Convenience method for encoding data to a file.As of v 2.3, if there is a error, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned false, but in retrospect that's a pretty poor way to handle it.
- Parameters:
dataToEncode
- byte array of data to encode in base64 formfilename
- Filename for saving encoded data- Throws:
java.io.IOException
- if there is an errorjava.lang.NullPointerException
- if dataToEncode is null- Since:
- 2.1
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decodeToFile
public static void decodeToFile(java.lang.String dataToDecode, java.lang.String filename) throws java.io.IOException
Convenience method for decoding data to a file.As of v 2.3, if there is a error, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned false, but in retrospect that's a pretty poor way to handle it.
- Parameters:
dataToDecode
- Base64-encoded data as a stringfilename
- Filename for saving decoded data- Throws:
java.io.IOException
- if there is an error- Since:
- 2.1
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decodeFromFile
public static byte[] decodeFromFile(java.lang.String filename) throws java.io.IOException
Convenience method for reading a base64-encoded file and decoding it.As of v 2.3, if there is a error, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned false, but in retrospect that's a pretty poor way to handle it.
- Parameters:
filename
- Filename for reading encoded data- Returns:
- decoded byte array
- Throws:
java.io.IOException
- if there is an error- Since:
- 2.1
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encodeFromFile
public static java.lang.String encodeFromFile(java.lang.String filename) throws java.io.IOException
Convenience method for reading a binary file and base64-encoding it.As of v 2.3, if there is a error, the method will throw an java.io.IOException. This is new to v2.3! In earlier versions, it just returned false, but in retrospect that's a pretty poor way to handle it.
- Parameters:
filename
- Filename for reading binary data- Returns:
- base64-encoded string
- Throws:
java.io.IOException
- if there is an error- Since:
- 2.1
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encodeFileToFile
public static void encodeFileToFile(java.lang.String infile, java.lang.String outfile) throws java.io.IOException
Reads infile and encodes it to outfile.- Parameters:
infile
- Input fileoutfile
- Output file- Throws:
java.io.IOException
- if there is an error- Since:
- 2.2
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decodeFileToFile
public static void decodeFileToFile(java.lang.String infile, java.lang.String outfile) throws java.io.IOException
Reads infile and decodes it to outfile.- Parameters:
infile
- Input fileoutfile
- Output file- Throws:
java.io.IOException
- if there is an error- Since:
- 2.2
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