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A Java wrapper around the Trakt RESTful API and a simple DSL for easy interaction.
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/*
* Copyright 2010 Nabeel Mukhtar
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.jakewharton.trakt.util;
/**
* Provides serialization and deserialization between a regular string and a
* base-64 encoded string.
*
* This class was taken from Nabeel Mukhtar's github-java-sdk.
*/
public class Base64
{
/* ******** P U B L I C F I E L D S ******** */
/** The Constant NO_OPTIONS. */
public final static int NO_OPTIONS = 0;
/** The Constant ENCODE. */
public final static int ENCODE = 1;
/** The Constant DECODE. */
public final static int DECODE = 0;
/** The Constant GZIP. */
public final static int GZIP = 2;
/** The Constant DONT_GUNZIP. */
public final static int DONT_GUNZIP = 4;
/** The Constant DO_BREAK_LINES. */
public final static int DO_BREAK_LINES = 8;
/** The Constant URL_SAFE. */
public final static int URL_SAFE = 16;
/** The Constant ORDERED. */
public final static int ORDERED = 32;
/* ******** P R I V A T E F I E L D S ******** */
/** The Constant MAX_LINE_LENGTH. */
private final static int MAX_LINE_LENGTH = 76;
/** The Constant EQUALS_SIGN. */
private final static byte EQUALS_SIGN = (byte)'=';
/** The Constant NEW_LINE. */
private final static byte NEW_LINE = (byte)'\n';
/** The Constant PREFERRED_ENCODING. */
private final static String PREFERRED_ENCODING = "US-ASCII";
/** The Constant WHITE_SPACE_ENC. */
private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
/** The Constant EQUALS_SIGN_ENC. */
private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding
/* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */
/** The Constant _STANDARD_ALPHABET. */
/* Host platform me be something funny like EBCDIC, so we hardcode these values. */
private final static byte[] _STANDARD_ALPHABET = {
(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
(byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'+', (byte)'/'
};
/** The Constant _STANDARD_DECODABET. */
private final static byte[] _STANDARD_DECODABET = {
-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
-5,-5, // Whitespace: Tab and Linefeed
-9,-9, // Decimal 11 - 12
-5, // Whitespace: Carriage Return
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
-9,-9,-9,-9,-9, // Decimal 27 - 31
-5, // Whitespace: Space
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
62, // Plus sign at decimal 43
-9,-9,-9, // Decimal 44 - 46
63, // Slash at decimal 47
52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
-9,-9,-9, // Decimal 58 - 60
-1, // Equals sign at decimal 61
-9,-9,-9, // Decimal 62 - 64
0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
-9,-9,-9,-9,-9,-9, // Decimal 91 - 96
26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
-9,-9,-9,-9,-9 // Decimal 123 - 127
,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
};
/* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */
/** The Constant _URL_SAFE_ALPHABET. */
private final static byte[] _URL_SAFE_ALPHABET = {
(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z',
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5',
(byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'-', (byte)'_'
};
/** The Constant _URL_SAFE_DECODABET. */
private final static byte[] _URL_SAFE_DECODABET = {
-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
-5,-5, // Whitespace: Tab and Linefeed
-9,-9, // Decimal 11 - 12
-5, // Whitespace: Carriage Return
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
-9,-9,-9,-9,-9, // Decimal 27 - 31
-5, // Whitespace: Space
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
-9, // Plus sign at decimal 43
-9, // Decimal 44
62, // Minus sign at decimal 45
-9, // Decimal 46
-9, // Slash at decimal 47
52,53,54,55,56,57,58,59,60,61, // Numbers zero through nine
-9,-9,-9, // Decimal 58 - 60
-1, // Equals sign at decimal 61
-9,-9,-9, // Decimal 62 - 64
0,1,2,3,4,5,6,7,8,9,10,11,12,13, // Letters 'A' through 'N'
14,15,16,17,18,19,20,21,22,23,24,25, // Letters 'O' through 'Z'
-9,-9,-9,-9, // Decimal 91 - 94
63, // Underscore at decimal 95
-9, // Decimal 96
26,27,28,29,30,31,32,33,34,35,36,37,38, // Letters 'a' through 'm'
39,40,41,42,43,44,45,46,47,48,49,50,51, // Letters 'n' through 'z'
-9,-9,-9,-9,-9 // Decimal 123 - 127
,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
};
/* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */
/** The Constant _ORDERED_ALPHABET. */
private final static byte[] _ORDERED_ALPHABET = {
(byte)'-',
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4',
(byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9',
(byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F', (byte)'G',
(byte)'H', (byte)'I', (byte)'J', (byte)'K', (byte)'L', (byte)'M', (byte)'N',
(byte)'O', (byte)'P', (byte)'Q', (byte)'R', (byte)'S', (byte)'T', (byte)'U',
(byte)'V', (byte)'W', (byte)'X', (byte)'Y', (byte)'Z',
(byte)'_',
(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f', (byte)'g',
(byte)'h', (byte)'i', (byte)'j', (byte)'k', (byte)'l', (byte)'m', (byte)'n',
(byte)'o', (byte)'p', (byte)'q', (byte)'r', (byte)'s', (byte)'t', (byte)'u',
(byte)'v', (byte)'w', (byte)'x', (byte)'y', (byte)'z'
};
/** The Constant _ORDERED_DECODABET. */
private final static byte[] _ORDERED_DECODABET = {
-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 0 - 8
-5,-5, // Whitespace: Tab and Linefeed
-9,-9, // Decimal 11 - 12
-5, // Whitespace: Carriage Return
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 14 - 26
-9,-9,-9,-9,-9, // Decimal 27 - 31
-5, // Whitespace: Space
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 33 - 42
-9, // Plus sign at decimal 43
-9, // Decimal 44
0, // Minus sign at decimal 45
-9, // Decimal 46
-9, // Slash at decimal 47
1,2,3,4,5,6,7,8,9,10, // Numbers zero through nine
-9,-9,-9, // Decimal 58 - 60
-1, // Equals sign at decimal 61
-9,-9,-9, // Decimal 62 - 64
11,12,13,14,15,16,17,18,19,20,21,22,23, // Letters 'A' through 'M'
24,25,26,27,28,29,30,31,32,33,34,35,36, // Letters 'N' through 'Z'
-9,-9,-9,-9, // Decimal 91 - 94
37, // Underscore at decimal 95
-9, // Decimal 96
38,39,40,41,42,43,44,45,46,47,48,49,50, // Letters 'a' through 'm'
51,52,53,54,55,56,57,58,59,60,61,62,63, // Letters 'n' through 'z'
-9,-9,-9,-9,-9 // Decimal 123 - 127
,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255
};
/* ******** D E T E R M I N E W H I C H A L H A B E T ******** */
/**
* Gets the alphabet.
*
* @param options
* the options
*
* @return the alphabet
*/
private final static byte[] getAlphabet( int options ) {
if ((options & URL_SAFE) == URL_SAFE) {
return _URL_SAFE_ALPHABET;
} else if ((options & ORDERED) == ORDERED) {
return _ORDERED_ALPHABET;
} else {
return _STANDARD_ALPHABET;
}
} // end getAlphabet
/**
* Gets the decodabet.
*
* @param options
* the options
*
* @return the decodabet
*/
private final static byte[] getDecodabet( int options ) {
if( (options & URL_SAFE) == URL_SAFE) {
return _URL_SAFE_DECODABET;
} else if ((options & ORDERED) == ORDERED) {
return _ORDERED_DECODABET;
} else {
return _STANDARD_DECODABET;
}
} // end getAlphabet
/**
* Instantiates a new base64.
*/
private Base64(){}
/* ******** E N C O D I N G M E T H O D S ******** */
/**
* Encode3to4.
*
* @param b4
* the b4
* @param threeBytes
* the three bytes
* @param numSigBytes
* the num sig bytes
* @param options
* the options
*
* @return the byte[]
*/
private static byte[] encode3to4( byte[] b4, byte[] threeBytes, int numSigBytes, int options ) {
encode3to4( threeBytes, 0, numSigBytes, b4, 0, options );
return b4;
} // end encode3to4
/**
* Encode3to4.
*
* @param source
* the source
* @param srcOffset
* the src offset
* @param numSigBytes
* the num sig bytes
* @param destination
* the destination
* @param destOffset
* the dest offset
* @param options
* the options
*
* @return the byte[]
*/
private static byte[] encode3to4(
byte[] source, int srcOffset, int numSigBytes,
byte[] destination, int destOffset, int options ) {
byte[] ALPHABET = getAlphabet( options );
// 1 2 3
// 01234567890123456789012345678901 Bit position
// --------000000001111111122222222 Array position from threeBytes
// --------| || || || | Six bit groups to index ALPHABET
// >>18 >>12 >> 6 >> 0 Right shift necessary
// 0x3f 0x3f 0x3f Additional AND
// Create buffer with zero-padding if there are only one or two
// significant bytes passed in the array.
// We have to shift left 24 in order to flush out the 1's that appear
// when Java treats a value as negative that is cast from a byte to an int.
int inBuff = ( numSigBytes > 0 ? ((source[ srcOffset ] << 24) >>> 8) : 0 )
| ( numSigBytes > 1 ? ((source[ srcOffset + 1 ] << 24) >>> 16) : 0 )
| ( numSigBytes > 2 ? ((source[ srcOffset + 2 ] << 24) >>> 24) : 0 );
switch( numSigBytes )
{
case 3:
destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];
destination[ destOffset + 3 ] = ALPHABET[ (inBuff ) & 0x3f ];
return destination;
case 2:
destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
destination[ destOffset + 2 ] = ALPHABET[ (inBuff >>> 6) & 0x3f ];
destination[ destOffset + 3 ] = EQUALS_SIGN;
return destination;
case 1:
destination[ destOffset ] = ALPHABET[ (inBuff >>> 18) ];
destination[ destOffset + 1 ] = ALPHABET[ (inBuff >>> 12) & 0x3f ];
destination[ destOffset + 2 ] = EQUALS_SIGN;
destination[ destOffset + 3 ] = EQUALS_SIGN;
return destination;
default:
return destination;
} // end switch
} // end encode3to4
/**
* Encode.
*
* @param raw
* the raw
* @param encoded
* the encoded
*/
public static void encode( java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded ){
byte[] raw3 = new byte[3];
byte[] enc4 = new byte[4];
while( raw.hasRemaining() ){
int rem = Math.min(3,raw.remaining());
raw.get(raw3,0,rem);
Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );
encoded.put(enc4);
} // end input remaining
}
/**
* Encode.
*
* @param raw
* the raw
* @param encoded
* the encoded
*/
public static void encode( java.nio.ByteBuffer raw, java.nio.CharBuffer encoded ){
byte[] raw3 = new byte[3];
byte[] enc4 = new byte[4];
while( raw.hasRemaining() ){
int rem = Math.min(3,raw.remaining());
raw.get(raw3,0,rem);
Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS );
for( int i = 0; i < 4; i++ ){
encoded.put( (char)(enc4[i] & 0xFF) );
}
} // end input remaining
}
/**
* Encode object.
*
* @param serializableObject
* the serializable object
*
* @return the string
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String encodeObject( java.io.Serializable serializableObject )
throws java.io.IOException {
return encodeObject( serializableObject, NO_OPTIONS );
} // end encodeObject
/**
* Encode object.
*
* @param serializableObject
* the serializable object
* @param options
* the options
*
* @return the string
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String encodeObject( java.io.Serializable serializableObject, int options )
throws java.io.IOException {
if( serializableObject == null ){
throw new NullPointerException( "Cannot serialize a null object." );
} // end if: null
// Streams
java.io.ByteArrayOutputStream baos = null;
java.io.OutputStream b64os = null;
java.util.zip.GZIPOutputStream gzos = null;
java.io.ObjectOutputStream oos = null;
try {
// ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
baos = new java.io.ByteArrayOutputStream();
b64os = new Base64.OutputStream( baos, ENCODE | options );
if( (options & GZIP) != 0 ){
// Gzip
gzos = new java.util.zip.GZIPOutputStream(b64os);
oos = new java.io.ObjectOutputStream( gzos );
} else {
// Not gzipped
oos = new java.io.ObjectOutputStream( b64os );
}
oos.writeObject( serializableObject );
} // end try
catch( java.io.IOException e ) {
// Catch it and then throw it immediately so that
// the finally{} block is called for cleanup.
throw e;
} // end catch
finally {
try{ oos.close(); } catch( Exception e ){}
try{ gzos.close(); } catch( Exception e ){}
try{ b64os.close(); } catch( Exception e ){}
try{ baos.close(); } catch( Exception e ){}
} // end finally
// Return value according to relevant encoding.
try {
return new String( baos.toByteArray(), PREFERRED_ENCODING );
} // end try
catch (java.io.UnsupportedEncodingException uue){
// Fall back to some Java default
return new String( baos.toByteArray() );
} // end catch
} // end encode
/**
* Encode bytes.
*
* @param source
* the source
*
* @return the string
*/
public static String encodeBytes( byte[] source ) {
// Since we're not going to have the GZIP encoding turned on,
// we're not going to have an java.io.IOException thrown, so
// we should not force the user to have to catch it.
String encoded = null;
try {
encoded = encodeBytes(source, 0, source.length, NO_OPTIONS);
} catch (java.io.IOException ex) {
assert false : ex.getMessage();
} // end catch
assert encoded != null;
return encoded;
} // end encodeBytes
/**
* Encode bytes.
*
* @param source
* the source
* @param options
* the options
*
* @return the string
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String encodeBytes( byte[] source, int options ) throws java.io.IOException {
return encodeBytes( source, 0, source.length, options );
} // end encodeBytes
/**
* Encode bytes.
*
* @param source
* the source
* @param off
* the off
* @param len
* the len
*
* @return the string
*/
public static String encodeBytes( byte[] source, int off, int len ) {
// Since we're not going to have the GZIP encoding turned on,
// we're not going to have an java.io.IOException thrown, so
// we should not force the user to have to catch it.
String encoded = null;
try {
encoded = encodeBytes( source, off, len, NO_OPTIONS );
} catch (java.io.IOException ex) {
assert false : ex.getMessage();
} // end catch
assert encoded != null;
return encoded;
} // end encodeBytes
/**
* Encode bytes.
*
* @param source
* the source
* @param off
* the off
* @param len
* the len
* @param options
* the options
*
* @return the string
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String encodeBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {
byte[] encoded = encodeBytesToBytes( source, off, len, options );
// Return value according to relevant encoding.
try {
return new String( encoded, PREFERRED_ENCODING );
} // end try
catch (java.io.UnsupportedEncodingException uue) {
return new String( encoded );
} // end catch
} // end encodeBytes
/**
* Encode bytes to bytes.
*
* @param source
* the source
*
* @return the byte[]
*/
public static byte[] encodeBytesToBytes( byte[] source ) {
byte[] encoded = null;
try {
encoded = encodeBytesToBytes( source, 0, source.length, Base64.NO_OPTIONS );
} catch( java.io.IOException ex ) {
assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();
}
return encoded;
}
/**
* Encode bytes to bytes.
*
* @param source
* the source
* @param off
* the off
* @param len
* the len
* @param options
* the options
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] encodeBytesToBytes( byte[] source, int off, int len, int options ) throws java.io.IOException {
if( source == null ){
throw new NullPointerException( "Cannot serialize a null array." );
} // end if: null
if( off < 0 ){
throw new IllegalArgumentException( "Cannot have negative offset: " + off );
} // end if: off < 0
if( len < 0 ){
throw new IllegalArgumentException( "Cannot have length offset: " + len );
} // end if: len < 0
if( off + len > source.length ){
throw new IllegalArgumentException(
String.format( "Cannot have offset of %d and length of %d with array of length %d", off,len,source.length));
} // end if: off < 0
// Compress?
if( (options & GZIP) != 0 ) {
java.io.ByteArrayOutputStream baos = null;
java.util.zip.GZIPOutputStream gzos = null;
Base64.OutputStream b64os = null;
try {
// GZip -> Base64 -> ByteArray
baos = new java.io.ByteArrayOutputStream();
b64os = new Base64.OutputStream( baos, ENCODE | options );
gzos = new java.util.zip.GZIPOutputStream( b64os );
gzos.write( source, off, len );
gzos.close();
} // end try
catch( java.io.IOException e ) {
// Catch it and then throw it immediately so that
// the finally{} block is called for cleanup.
throw e;
} // end catch
finally {
try{ gzos.close(); } catch( Exception e ){}
try{ b64os.close(); } catch( Exception e ){}
try{ baos.close(); } catch( Exception e ){}
} // end finally
return baos.toByteArray();
} // end if: compress
// Else, don't compress. Better not to use streams at all then.
else {
boolean breakLines = (options & DO_BREAK_LINES) != 0;
//int len43 = len * 4 / 3;
//byte[] outBuff = new byte[ ( len43 ) // Main 4:3
// + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding
// + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines
// Try to determine more precisely how big the array needs to be.
// If we get it right, we don't have to do an array copy, and
// we save a bunch of memory.
int encLen = ( len / 3 ) * 4 + ( len % 3 > 0 ? 4 : 0 ); // Bytes needed for actual encoding
if( breakLines ){
encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline characters
}
byte[] outBuff = new byte[ encLen ];
int d = 0;
int e = 0;
int len2 = len - 2;
int lineLength = 0;
for( ; d < len2; d+=3, e+=4 ) {
encode3to4( source, d+off, 3, outBuff, e, options );
lineLength += 4;
if( breakLines && lineLength >= MAX_LINE_LENGTH )
{
outBuff[e+4] = NEW_LINE;
e++;
lineLength = 0;
} // end if: end of line
} // en dfor: each piece of array
if( d < len ) {
encode3to4( source, d+off, len - d, outBuff, e, options );
e += 4;
} // end if: some padding needed
// Only resize array if we didn't guess it right.
if( e <= outBuff.length - 1 ){
// If breaking lines and the last byte falls right at
// the line length (76 bytes per line), there will be
// one extra byte, and the array will need to be resized.
// Not too bad of an estimate on array size, I'd say.
byte[] finalOut = new byte[e];
System.arraycopy(outBuff,0, finalOut,0,e);
//System.err.println("Having to resize array from " + outBuff.length + " to " + e );
return finalOut;
} else {
//System.err.println("No need to resize array.");
return outBuff;
}
} // end else: don't compress
} // end encodeBytesToBytes
/* ******** D E C O D I N G M E T H O D S ******** */
/**
* Decode4to3.
*
* @param source
* the source
* @param srcOffset
* the src offset
* @param destination
* the destination
* @param destOffset
* the dest offset
* @param options
* the options
*
* @return the int
*/
private static int decode4to3(
byte[] source, int srcOffset,
byte[] destination, int destOffset, int options ) {
// Lots of error checking and exception throwing
if( source == null ){
throw new NullPointerException( "Source array was null." );
} // end if
if( destination == null ){
throw new NullPointerException( "Destination array was null." );
} // end if
if( srcOffset < 0 || srcOffset + 3 >= source.length ){
throw new IllegalArgumentException( String.format(
"Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset ) );
} // end if
if( destOffset < 0 || destOffset +2 >= destination.length ){
throw new IllegalArgumentException( String.format(
"Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset ) );
} // end if
byte[] DECODABET = getDecodabet( options );
// Example: Dk==
if( source[ srcOffset + 2] == EQUALS_SIGN ) {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
| ( ( DECODABET[ source[ srcOffset + 1] ] & 0xFF ) << 12 );
destination[ destOffset ] = (byte)( outBuff >>> 16 );
return 1;
}
// Example: DkL=
else if( source[ srcOffset + 3 ] == EQUALS_SIGN ) {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
| ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
| ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6 );
destination[ destOffset ] = (byte)( outBuff >>> 16 );
destination[ destOffset + 1 ] = (byte)( outBuff >>> 8 );
return 2;
}
// Example: DkLE
else {
// Two ways to do the same thing. Don't know which way I like best.
//int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 )
// | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
// | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
// | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
int outBuff = ( ( DECODABET[ source[ srcOffset ] ] & 0xFF ) << 18 )
| ( ( DECODABET[ source[ srcOffset + 1 ] ] & 0xFF ) << 12 )
| ( ( DECODABET[ source[ srcOffset + 2 ] ] & 0xFF ) << 6)
| ( ( DECODABET[ source[ srcOffset + 3 ] ] & 0xFF ) );
destination[ destOffset ] = (byte)( outBuff >> 16 );
destination[ destOffset + 1 ] = (byte)( outBuff >> 8 );
destination[ destOffset + 2 ] = (byte)( outBuff );
return 3;
}
} // end decodeToBytes
/**
* Decode.
*
* @param source
* the source
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] decode( byte[] source )
throws java.io.IOException {
byte[] decoded = null;
// try {
decoded = decode( source, 0, source.length, Base64.NO_OPTIONS );
// } catch( java.io.IOException ex ) {
// assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage();
// }
return decoded;
}
/**
* Decode.
*
* @param source
* the source
* @param off
* the off
* @param len
* the len
* @param options
* the options
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] decode( byte[] source, int off, int len, int options )
throws java.io.IOException {
// Lots of error checking and exception throwing
if( source == null ){
throw new NullPointerException( "Cannot decode null source array." );
} // end if
if( off < 0 || off + len > source.length ){
throw new IllegalArgumentException( String.format(
"Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len ) );
} // end if
if( len == 0 ){
return new byte[0];
}else if( len < 4 ){
throw new IllegalArgumentException(
"Base64-encoded string must have at least four characters, but length specified was " + len );
} // end if
byte[] DECODABET = getDecodabet( options );
int len34 = len * 3 / 4; // Estimate on array size
byte[] outBuff = new byte[ len34 ]; // Upper limit on size of output
int outBuffPosn = 0; // Keep track of where we're writing
byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating white space
int b4Posn = 0; // Keep track of four byte input buffer
int i = 0; // Source array counter
byte sbiDecode = 0; // Special value from DECODABET
for( i = off; i < off+len; i++ ) { // Loop through source
sbiDecode = DECODABET[ source[i]&0xFF ];
// White space, Equals sign, or legit Base64 character
// Note the values such as -5 and -9 in the
// DECODABETs at the top of the file.
if( sbiDecode >= WHITE_SPACE_ENC ) {
if( sbiDecode >= EQUALS_SIGN_ENC ) {
b4[ b4Posn++ ] = source[i]; // Save non-whitespace
if( b4Posn > 3 ) { // Time to decode?
outBuffPosn += decode4to3( b4, 0, outBuff, outBuffPosn, options );
b4Posn = 0;
// If that was the equals sign, break out of 'for' loop
if( source[i] == EQUALS_SIGN ) {
break;
} // end if: equals sign
} // end if: quartet built
} // end if: equals sign or better
} // end if: white space, equals sign or better
else {
// There's a bad input character in the Base64 stream.
throw new java.io.IOException( String.format(
"Bad Base64 input character decimal %d in array position %d", ((int)source[i])&0xFF, i ) );
} // end else:
} // each input character
byte[] out = new byte[ outBuffPosn ];
System.arraycopy( outBuff, 0, out, 0, outBuffPosn );
return out;
} // end decode
/**
* Decode.
*
* @param s
* the s
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] decode( String s ) throws java.io.IOException {
return decode( s, NO_OPTIONS );
}
/**
* Decode.
*
* @param s
* the s
* @param options
* the options
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] decode( String s, int options ) throws java.io.IOException {
if( s == null ){
throw new NullPointerException( "Input string was null." );
} // end if
byte[] bytes;
try {
bytes = s.getBytes( PREFERRED_ENCODING );
} // end try
catch( java.io.UnsupportedEncodingException uee ) {
bytes = s.getBytes();
} // end catch
//
// Decode
bytes = decode( bytes, 0, bytes.length, options );
// Check to see if it's gzip-compressed
// GZIP Magic Two-Byte Number: 0x8b1f (35615)
boolean dontGunzip = (options & DONT_GUNZIP) != 0;
if( (bytes != null) && (bytes.length >= 4) && (!dontGunzip) ) {
int head = ((int)bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head ) {
java.io.ByteArrayInputStream bais = null;
java.util.zip.GZIPInputStream gzis = null;
java.io.ByteArrayOutputStream baos = null;
byte[] buffer = new byte[2048];
int length = 0;
try {
baos = new java.io.ByteArrayOutputStream();
bais = new java.io.ByteArrayInputStream( bytes );
gzis = new java.util.zip.GZIPInputStream( bais );
while( ( length = gzis.read( buffer ) ) >= 0 ) {
baos.write(buffer,0,length);
} // end while: reading input
// No error? Get new bytes.
bytes = baos.toByteArray();
} // end try
catch( java.io.IOException e ) {
e.printStackTrace();
// Just return originally-decoded bytes
} // end catch
finally {
try{ baos.close(); } catch( Exception e ){}
try{ gzis.close(); } catch( Exception e ){}
try{ bais.close(); } catch( Exception e ){}
} // end finally
} // end if: gzipped
} // end if: bytes.length >= 2
return bytes;
} // end decode
/**
* Decode to object.
*
* @param encodedObject
* the encoded object
*
* @return the object
*
* @throws IOException
* Signals that an I/O exception has occurred.
* @throws ClassNotFoundException
* the class not found exception
*/
public static Object decodeToObject( String encodedObject )
throws java.io.IOException, java.lang.ClassNotFoundException {
return decodeToObject(encodedObject,NO_OPTIONS,null);
}
/**
* Decode to object.
*
* @param encodedObject
* the encoded object
* @param options
* the options
* @param loader
* the loader
*
* @return the object
*
* @throws IOException
* Signals that an I/O exception has occurred.
* @throws ClassNotFoundException
* the class not found exception
*/
public static Object decodeToObject(
String encodedObject, int options, final ClassLoader loader )
throws java.io.IOException, java.lang.ClassNotFoundException {
// Decode and gunzip if necessary
byte[] objBytes = decode( encodedObject, options );
java.io.ByteArrayInputStream bais = null;
java.io.ObjectInputStream ois = null;
Object obj = null;
try {
bais = new java.io.ByteArrayInputStream( objBytes );
// If no custom class loader is provided, use Java's builtin OIS.
if( loader == null ){
ois = new java.io.ObjectInputStream( bais );
} // end if: no loader provided
// Else make a customized object input stream that uses
// the provided class loader.
else {
ois = new java.io.ObjectInputStream(bais){
@Override
public Class resolveClass(java.io.ObjectStreamClass streamClass)
throws java.io.IOException, ClassNotFoundException {
Class c = Class.forName(streamClass.getName(), false, loader);
if( c == null ){
return super.resolveClass(streamClass);
} else {
return c; // Class loader knows of this class.
} // end else: not null
} // end resolveClass
}; // end ois
} // end else: no custom class loader
obj = ois.readObject();
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and throw in order to execute finally{}
} // end catch
catch( java.lang.ClassNotFoundException e ) {
throw e; // Catch and throw in order to execute finally{}
} // end catch
finally {
try{ bais.close(); } catch( Exception e ){}
try{ ois.close(); } catch( Exception e ){}
} // end finally
return obj;
} // end decodeObject
/**
* Encode to file.
*
* @param dataToEncode
* the data to encode
* @param filename
* the filename
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void encodeToFile( byte[] dataToEncode, String filename )
throws java.io.IOException {
if( dataToEncode == null ){
throw new NullPointerException( "Data to encode was null." );
} // end iff
Base64.OutputStream bos = null;
try {
bos = new Base64.OutputStream(
new java.io.FileOutputStream( filename ), Base64.ENCODE );
bos.write( dataToEncode );
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and throw to execute finally{} block
} // end catch: java.io.IOException
finally {
try{ bos.close(); } catch( Exception e ){}
} // end finally
} // end encodeToFile
/**
* Decode to file.
*
* @param dataToDecode
* the data to decode
* @param filename
* the filename
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void decodeToFile( String dataToDecode, String filename )
throws java.io.IOException {
Base64.OutputStream bos = null;
try{
bos = new Base64.OutputStream(
new java.io.FileOutputStream( filename ), Base64.DECODE );
bos.write( dataToDecode.getBytes( PREFERRED_ENCODING ) );
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and throw to execute finally{} block
} // end catch: java.io.IOException
finally {
try{ bos.close(); } catch( Exception e ){}
} // end finally
} // end decodeToFile
/**
* Decode from file.
*
* @param filename
* the filename
*
* @return the byte[]
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] decodeFromFile( String filename )
throws java.io.IOException {
byte[] decodedData = null;
Base64.InputStream bis = null;
try
{
// Set up some useful variables
java.io.File file = new java.io.File( filename );
byte[] buffer = null;
int length = 0;
int numBytes = 0;
// Check for size of file
if( file.length() > Integer.MAX_VALUE )
{
throw new java.io.IOException( "File is too big for this convenience method (" + file.length() + " bytes)." );
} // end if: file too big for int index
buffer = new byte[ (int)file.length() ];
// Open a stream
bis = new Base64.InputStream(
new java.io.BufferedInputStream(
new java.io.FileInputStream( file ) ), Base64.DECODE );
// Read until done
while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {
length += numBytes;
} // end while
// Save in a variable to return
decodedData = new byte[ length ];
System.arraycopy( buffer, 0, decodedData, 0, length );
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and release to execute finally{}
} // end catch: java.io.IOException
finally {
try{ bis.close(); } catch( Exception e) {}
} // end finally
return decodedData;
} // end decodeFromFile
/**
* Encode from file.
*
* @param filename
* the filename
*
* @return the string
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String encodeFromFile( String filename )
throws java.io.IOException {
String encodedData = null;
Base64.InputStream bis = null;
try
{
// Set up some useful variables
java.io.File file = new java.io.File( filename );
byte[] buffer = new byte[ Math.max((int)(file.length() * 1.4+1),40) ]; // Need max() for math on small files (v2.2.1); Need +1 for a few corner cases (v2.3.5)
int length = 0;
int numBytes = 0;
// Open a stream
bis = new Base64.InputStream(
new java.io.BufferedInputStream(
new java.io.FileInputStream( file ) ), Base64.ENCODE );
// Read until done
while( ( numBytes = bis.read( buffer, length, 4096 ) ) >= 0 ) {
length += numBytes;
} // end while
// Save in a variable to return
encodedData = new String( buffer, 0, length, Base64.PREFERRED_ENCODING );
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and release to execute finally{}
} // end catch: java.io.IOException
finally {
try{ bis.close(); } catch( Exception e) {}
} // end finally
return encodedData;
} // end encodeFromFile
/**
* Encode file to file.
*
* @param infile
* the infile
* @param outfile
* the outfile
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void encodeFileToFile( String infile, String outfile )
throws java.io.IOException {
String encoded = Base64.encodeFromFile( infile );
java.io.OutputStream out = null;
try{
out = new java.io.BufferedOutputStream(
new java.io.FileOutputStream( outfile ) );
out.write( encoded.getBytes("US-ASCII") ); // Strict, 7-bit output.
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and release to execute finally{}
} // end catch
finally {
try { out.close(); }
catch( Exception ex ){}
} // end finally
} // end encodeFileToFile
/**
* Decode file to file.
*
* @param infile
* the infile
* @param outfile
* the outfile
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void decodeFileToFile( String infile, String outfile )
throws java.io.IOException {
byte[] decoded = Base64.decodeFromFile( infile );
java.io.OutputStream out = null;
try{
out = new java.io.BufferedOutputStream(
new java.io.FileOutputStream( outfile ) );
out.write( decoded );
} // end try
catch( java.io.IOException e ) {
throw e; // Catch and release to execute finally{}
} // end catch
finally {
try { out.close(); }
catch( Exception ex ){}
} // end finally
} // end decodeFileToFile
/* ******** I N N E R C L A S S I N P U T S T R E A M ******** */
/**
* The Class InputStream.
*/
public static class InputStream extends java.io.FilterInputStream {
/** The encode. */
private boolean encode; // Encoding or decoding
/** The position. */
private int position; // Current position in the buffer
/** The buffer. */
private byte[] buffer; // Small buffer holding converted data
/** The buffer length. */
private int bufferLength; // Length of buffer (3 or 4)
/** The num sig bytes. */
private int numSigBytes; // Number of meaningful bytes in the buffer
/** The line length. */
private int lineLength;
/** The break lines. */
private boolean breakLines; // Break lines at less than 80 characters
/** The options. */
private int options; // Record options used to create the stream.
/** The decodabet. */
private byte[] decodabet; // Local copies to avoid extra method calls
/**
* Instantiates a new input stream.
*
* @param in
* the in
*/
public InputStream( java.io.InputStream in ) {
this( in, DECODE );
} // end constructor
/**
* Instantiates a new input stream.
*
* @param in
* the in
* @param options
* the options
*/
public InputStream( java.io.InputStream in, int options ) {
super( in );
this.options = options; // Record for later
this.breakLines = (options & DO_BREAK_LINES) > 0;
this.encode = (options & ENCODE) > 0;
this.bufferLength = encode ? 4 : 3;
this.buffer = new byte[ bufferLength ];
this.position = -1;
this.lineLength = 0;
this.decodabet = getDecodabet(options);
} // end constructor
/* (non-Javadoc)
* @see java.io.FilterInputStream#read()
*/
@Override
public int read() throws java.io.IOException {
// Do we need to get data?
if( position < 0 ) {
if( encode ) {
byte[] b3 = new byte[3];
int numBinaryBytes = 0;
for( int i = 0; i < 3; i++ ) {
int b = in.read();
// If end of stream, b is -1.
if( b >= 0 ) {
b3[i] = (byte)b;
numBinaryBytes++;
} else {
break; // out of for loop
} // end else: end of stream
} // end for: each needed input byte
if( numBinaryBytes > 0 ) {
encode3to4( b3, 0, numBinaryBytes, buffer, 0, options );
position = 0;
numSigBytes = 4;
} // end if: got data
else {
return -1; // Must be end of stream
} // end else
} // end if: encoding
// Else decoding
else {
byte[] b4 = new byte[4];
int i = 0;
for( i = 0; i < 4; i++ ) {
// Read four "meaningful" bytes:
int b = 0;
do{ b = in.read(); }
while( b >= 0 && decodabet[ b & 0x7f ] <= WHITE_SPACE_ENC );
if( b < 0 ) {
break; // Reads a -1 if end of stream
} // end if: end of stream
b4[i] = (byte)b;
} // end for: each needed input byte
if( i == 4 ) {
numSigBytes = decode4to3( b4, 0, buffer, 0, options );
position = 0;
} // end if: got four characters
else if( i == 0 ){
return -1;
} // end else if: also padded correctly
else {
// Must have broken out from above.
throw new java.io.IOException( "Improperly padded Base64 input." );
} // end
} // end else: decode
} // end else: get data
// Got data?
if( position >= 0 ) {
// End of relevant data?
if( /*!encode &&*/ position >= numSigBytes ){
return -1;
} // end if: got data
if( encode && breakLines && lineLength >= MAX_LINE_LENGTH ) {
lineLength = 0;
return '\n';
} // end if
else {
lineLength++; // This isn't important when decoding
// but throwing an extra "if" seems
// just as wasteful.
int b = buffer[ position++ ];
if( position >= bufferLength ) {
position = -1;
} // end if: end
return b & 0xFF; // This is how you "cast" a byte that's
// intended to be unsigned.
} // end else
} // end if: position >= 0
// Else error
else {
throw new java.io.IOException( "Error in Base64 code reading stream." );
} // end else
} // end read
/* (non-Javadoc)
* @see java.io.FilterInputStream#read(byte[], int, int)
*/
@Override
public int read( byte[] dest, int off, int len )
throws java.io.IOException {
int i;
int b;
for( i = 0; i < len; i++ ) {
b = read();
if( b >= 0 ) {
dest[off + i] = (byte) b;
}
else if( i == 0 ) {
return -1;
}
else {
break; // Out of 'for' loop
} // Out of 'for' loop
} // end for: each byte read
return i;
} // end read
} // end inner class InputStream
/* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */
/**
* The Class OutputStream.
*/
public static class OutputStream extends java.io.FilterOutputStream {
/** The encode. */
private boolean encode;
/** The position. */
private int position;
/** The buffer. */
private byte[] buffer;
/** The buffer length. */
private int bufferLength;
/** The line length. */
private int lineLength;
/** The break lines. */
private boolean breakLines;
/** The b4. */
private byte[] b4; // Scratch used in a few places
/** The suspend encoding. */
private boolean suspendEncoding;
/** The options. */
private int options; // Record for later
/** The decodabet. */
private byte[] decodabet; // Local copies to avoid extra method calls
/**
* Instantiates a new output stream.
*
* @param out
* the out
*/
public OutputStream( java.io.OutputStream out ) {
this( out, ENCODE );
} // end constructor
/**
* Instantiates a new output stream.
*
* @param out
* the out
* @param options
* the options
*/
public OutputStream( java.io.OutputStream out, int options ) {
super( out );
this.breakLines = (options & DO_BREAK_LINES) != 0;
this.encode = (options & ENCODE) != 0;
this.bufferLength = encode ? 3 : 4;
this.buffer = new byte[ bufferLength ];
this.position = 0;
this.lineLength = 0;
this.suspendEncoding = false;
this.b4 = new byte[4];
this.options = options;
this.decodabet = getDecodabet(options);
} // end constructor
/* (non-Javadoc)
* @see java.io.FilterOutputStream#write(int)
*/
@Override
public void write(int theByte)
throws java.io.IOException {
// Encoding suspended?
if( suspendEncoding ) {
this.out.write( theByte );
return;
} // end if: supsended
// Encode?
if( encode ) {
buffer[ position++ ] = (byte)theByte;
if( position >= bufferLength ) { // Enough to encode.
this.out.write( encode3to4( b4, buffer, bufferLength, options ) );
lineLength += 4;
if( breakLines && lineLength >= MAX_LINE_LENGTH ) {
this.out.write( NEW_LINE );
lineLength = 0;
} // end if: end of line
position = 0;
} // end if: enough to output
} // end if: encoding
// Else, Decoding
else {
// Meaningful Base64 character?
if( decodabet[ theByte & 0x7f ] > WHITE_SPACE_ENC ) {
buffer[ position++ ] = (byte)theByte;
if( position >= bufferLength ) { // Enough to output.
int len = Base64.decode4to3( buffer, 0, b4, 0, options );
out.write( b4, 0, len );
position = 0;
} // end if: enough to output
} // end if: meaningful base64 character
else if( decodabet[ theByte & 0x7f ] != WHITE_SPACE_ENC ) {
throw new java.io.IOException( "Invalid character in Base64 data." );
} // end else: not white space either
} // end else: decoding
} // end write
/* (non-Javadoc)
* @see java.io.FilterOutputStream#write(byte[], int, int)
*/
@Override
public void write( byte[] theBytes, int off, int len )
throws java.io.IOException {
// Encoding suspended?
if( suspendEncoding ) {
this.out.write( theBytes, off, len );
return;
} // end if: supsended
for( int i = 0; i < len; i++ ) {
write( theBytes[ off + i ] );
} // end for: each byte written
} // end write
/**
* Flush base64.
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public void flushBase64() throws java.io.IOException {
if( position > 0 ) {
if( encode ) {
out.write( encode3to4( b4, buffer, position, options ) );
position = 0;
} // end if: encoding
else {
throw new java.io.IOException( "Base64 input not properly padded." );
} // end else: decoding
} // end if: buffer partially full
} // end flush
/* (non-Javadoc)
* @see java.io.FilterOutputStream#close()
*/
@Override
public void close() throws java.io.IOException {
// 1. Ensure that pending characters are written
flushBase64();
// 2. Actually close the stream
// Base class both flushes and closes.
super.close();
buffer = null;
out = null;
} // end close
/**
* Suspend encoding.
*
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public void suspendEncoding() throws java.io.IOException {
flushBase64();
this.suspendEncoding = true;
} // end suspendEncoding
/**
* Resume encoding.
*/
public void resumeEncoding() {
this.suspendEncoding = false;
} // end resumeEncoding
} // end inner class OutputStream
}