Mega Code Archive
Provides Base64 encoding and decoding
<![CDATA[
//package org.rsbot.util;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.math.BigInteger;
import java.util.HashMap;
import java.util.Map;
/**
* Provides Base64 encoding and decoding as defined by <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>.
* <p/>
* <p>
* This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> from RFC 2045 <cite>Multipurpose
* Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies</cite> by Freed and Borenstein.
* </p>
* <p>
* The class can be parameterized in the following manner with various constructors:
* <ul>
* <li>URL-safe mode: Default off.</li>
* <li>Line length: Default 76. Line length that aren't multiples of 4 will still essentially end up being multiples of
* 4 in the encoded data.
* <li>Line separator: Default is CRLF ("\r\n")</li>
* </ul>
* </p>
* <p>
* Since this class operates directly on byte streams, and not character streams, it is hard-coded to only encode/decode
* character encodings which are compatible with the lower 127 ASCII chart (ISO-8859-1, Windows-1252, UTF-8, etc).
* </p>
* <p>
* This class is not thread-safe. Each thread should use its own instance.
* </p>
*
* @author Apache Software Foundation
* @version $Revision$
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
* @since 1.0
*/
public class Base64 {
/**
* MIME chunk size per RFC 2045 section 6.8.
* <p/>
* <p>
* The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
* equal signs.
* </p>
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>
*/
public static final int MIME_CHUNK_SIZE = 76;
/**
* PEM chunk size per RFC 1421 section 4.3.2.4.
* <p/>
* <p>
* The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
* equal signs.
* </p>
*
* @see <a href="http://tools.ietf.org/html/rfc1421">RFC 1421 section 4.3.2.4</a>
*/
public static final int PEM_CHUNK_SIZE = 64;
private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;
/**
* Defines the default buffer size - currently {@value}
* - must be large enough for at least one encoded block+separator
*/
private static final int DEFAULT_BUFFER_SIZE = 8192;
/**
* Mask used to extract 8 bits, used in decoding bytes
*/
protected static final int MASK_8BITS = 0xff;
/**
* Byte used to pad output.
*/
protected static final byte PAD_DEFAULT = '='; // Allow static access to default
protected final byte PAD = PAD_DEFAULT; // instance variable just in case it needs to vary later
/**
* BASE32 characters are 6 bits in length.
* They are formed by taking a block of 3 octets to form a 24-bit string,
* which is converted into 4 BASE64 characters.
*/
private static final int BITS_PER_ENCODED_BYTE = 6;
private static final int BYTES_PER_UNENCODED_BLOCK = 3;
private static final int BYTES_PER_ENCODED_BLOCK = 4;
/**
* Chunk separator per RFC 2045 section 2.1.
* <p/>
* <p>
* N.B. The next major release may break compatibility and make this field private.
* </p>
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
*/
static final byte[] CHUNK_SEPARATOR = {'\r', '\n'};
/**
* This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet"
* equivalents as specified in Table 1 of RFC 2045.
* <p/>
* Thanks to "commons" project in ws.apache.org for this code.
* http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
*/
private static final byte[] STANDARD_ENCODE_TABLE = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/**
* This is a copy of the STANDARD_ENCODE_TABLE above, but with + and /
* changed to - and _ to make the encoded Base64 results more URL-SAFE.
* This table is only used when the Base64's mode is set to URL-SAFE.
*/
private static final byte[] URL_SAFE_ENCODE_TABLE = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
};
/**
* This array is a lookup table that translates Unicode characters drawn from the "Base64 Alphabet" (as specified in
* Table 1 of RFC 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64
* alphabet but fall within the bounds of the array are translated to -1.
* <p/>
* Note: '+' and '-' both decode to 62. '/' and '_' both decode to 63. This means decoder seamlessly handles both
* URL_SAFE and STANDARD base64. (The encoder, on the other hand, needs to know ahead of time what to emit).
* <p/>
* Thanks to "commons" project in ws.apache.org for this code.
* http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
*/
private static final byte[] DECODE_TABLE = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25, -1, -1, -1, -1, 63, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34,
35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
};
/**
* Base64 uses 6-bit fields.
*/
/**
* Mask used to extract 6 bits, used when encoding
*/
private static final int MASK_6BITS = 0x3f;
/**
* Number of bytes in each full block of unencoded data, e.g. 4 for Base64 and 5 for Base32
*/
private final int unencodedBlockSize;
/**
* Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32
*/
private final int encodedBlockSize;
/**
* Chunksize for encoding. Not used when decoding.
* A value of zero or less implies no chunking of the encoded data.
* Rounded down to nearest multiple of encodedBlockSize.
*/
protected final int lineLength;
/**
* Size of chunk separator. Not used unless {@link #lineLength} > 0.
*/
private final int chunkSeparatorLength;
/**
* Buffer for streaming.
*/
protected byte[] buffer;
/**
* Position where next character should be written in the buffer.
*/
protected int pos;
/**
* Position where next character should be read from the buffer.
*/
private int readPos;
/**
* Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless,
* and must be thrown away.
*/
protected boolean eof;
/**
* Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to
* make sure each encoded line never goes beyond lineLength (if lineLength > 0).
*/
protected int currentLinePos;
/**
* Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding.
* This variable helps track that.
*/
protected int modulus;
// The static final fields above are used for the original static byte[] methods on Base64.
// The private member fields below are used with the new streaming approach, which requires
// some state be preserved between calls of encode() and decode().
/**
* Encode table to use: either STANDARD or URL_SAFE. Note: the DECODE_TABLE above remains static because it is able
* to decode both STANDARD and URL_SAFE streams, but the encodeTable must be a member variable so we can switch
* between the two modes.
*/
private final byte[] encodeTable;
// Only one decode table currently; keep for consistency with Base32 code
private final byte[] decodeTable = DECODE_TABLE;
/**
* Line separator for encoding. Not used when decoding. Only used if lineLength > 0.
*/
private final byte[] lineSeparator;
/**
* Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
* <code>decodeSize = 3 + lineSeparator.length;</code>
*/
private final int decodeSize;
/**
* Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
* <code>encodeSize = 4 + lineSeparator.length;</code>
*/
private final int encodeSize;
/**
* Place holder for the bytes we're dealing with for our based logic.
* Bitwise operations store and extract the encoding or decoding from this variable.
*/
private int bitWorkArea;
/**
* Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
* <p>
* When encoding the line length is 0 (no chunking), and the encoding table is STANDARD_ENCODE_TABLE.
* </p>
* <p/>
* <p>
* When decoding all variants are supported.
* </p>
*/
public Base64() {
this(0);
}
/**
* Creates a Base64 codec used for decoding (all modes) and encoding in the given URL-safe mode.
* <p>
* When encoding the line length is 76, the line separator is CRLF, and the encoding table is STANDARD_ENCODE_TABLE.
* </p>
* <p/>
* <p>
* When decoding all variants are supported.
* </p>
*
* @param urlSafe if <code>true</code>, URL-safe encoding is used. In most cases this should be set to
* <code>false</code>.
* @since 1.4
*/
public Base64(boolean urlSafe) {
this(MIME_CHUNK_SIZE, CHUNK_SEPARATOR, urlSafe);
}
/**
* Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
* <p>
* When encoding the line length is given in the constructor, the line separator is CRLF, and the encoding table is
* STANDARD_ENCODE_TABLE.
* </p>
* <p>
* Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
* </p>
* <p>
* When decoding all variants are supported.
* </p>
*
* @param lineLength Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
* @since 1.4
*/
public Base64(int lineLength) {
this(lineLength, CHUNK_SEPARATOR);
}
/**
* Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
* <p>
* When encoding the line length and line separator are given in the constructor, and the encoding table is
* STANDARD_ENCODE_TABLE.
* </p>
* <p>
* Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
* </p>
* <p>
* When decoding all variants are supported.
* </p>
*
* @param lineLength Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
* @param lineSeparator Each line of encoded data will end with this sequence of bytes.
* @throws IllegalArgumentException Thrown when the provided lineSeparator included some base64 characters.
* @since 1.4
*/
public Base64(int lineLength, byte[] lineSeparator) {
this(lineLength, lineSeparator, false);
}
/**
* Creates a Base64 codec used for decoding (all modes) and encoding in URL-unsafe mode.
* <p>
* When encoding the line length and line separator are given in the constructor, and the encoding table is
* STANDARD_ENCODE_TABLE.
* </p>
* <p>
* Line lengths that aren't multiples of 4 will still essentially end up being multiples of 4 in the encoded data.
* </p>
* <p>
* When decoding all variants are supported.
* </p>
*
* @param lineLength Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 4).
* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
* @param lineSeparator Each line of encoded data will end with this sequence of bytes.
* @param urlSafe Instead of emitting '+' and '/' we emit '-' and '_' respectively. urlSafe is only applied to encode
* operations. Decoding seamlessly handles both modes.
* @throws IllegalArgumentException The provided lineSeparator included some base64 characters. That's not going to work!
* @since 1.4
*/
public Base64(int lineLength, byte[] lineSeparator, boolean urlSafe) {
this.unencodedBlockSize = BYTES_PER_UNENCODED_BLOCK;
this.encodedBlockSize = BYTES_PER_ENCODED_BLOCK;
this.lineLength = lineLength;
this.chunkSeparatorLength = lineSeparator == null ? 0 : lineSeparator.length;
// TODO could be simplified if there is no requirement to reject invalid line sep when length <=0
// @see test case Base64Test.testConstructors()
if (lineSeparator != null) {
if (containsAlphabetOrPad(lineSeparator)) {
String sep = StringUtil.newStringUtf8(lineSeparator);
throw new IllegalArgumentException("lineSeparator must not contain base64 characters: [" + sep + "]");
}
if (lineLength > 0) { // null line-sep forces no chunking rather than throwing IAE
this.encodeSize = BYTES_PER_ENCODED_BLOCK + lineSeparator.length;
this.lineSeparator = new byte[lineSeparator.length];
System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);
} else {
this.encodeSize = BYTES_PER_ENCODED_BLOCK;
this.lineSeparator = null;
}
} else {
this.encodeSize = BYTES_PER_ENCODED_BLOCK;
this.lineSeparator = null;
}
this.decodeSize = this.encodeSize - 1;
this.encodeTable = urlSafe ? URL_SAFE_ENCODE_TABLE : STANDARD_ENCODE_TABLE;
}
/**
* Returns true if this object has buffered data for reading.
*
* @return true if there is data still available for reading.
*/
boolean hasData() { // package protected for access from I/O streams
return this.buffer != null;
}
/**
* Returns the amount of buffered data available for reading.
*
* @return The amount of buffered data available for reading.
*/
int available() { // package protected for access from I/O streams
return buffer != null ? pos - readPos : 0;
}
/**
* Get the default buffer size. Can be overridden.
*
* @return {@link #DEFAULT_BUFFER_SIZE}
*/
protected int getDefaultBufferSize() {
return DEFAULT_BUFFER_SIZE;
}
/**
* Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}.
*/
private void resizeBuffer() {
if (buffer == null) {
buffer = new byte[getDefaultBufferSize()];
pos = 0;
readPos = 0;
} else {
byte[] b = new byte[buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR];
System.arraycopy(buffer, 0, b, 0, buffer.length);
buffer = b;
}
}
/**
* Ensure that the buffer has room for <code>size</code> bytes
*
* @param size minimum spare space required
*/
protected void ensureBufferSize(int size) {
if ((buffer == null) || (buffer.length < pos + size)) {
resizeBuffer();
}
}
/**
* Extracts buffered data into the provided byte[] array, starting at position bPos,
* up to a maximum of bAvail bytes. Returns how many bytes were actually extracted.
*
* @param b byte[] array to extract the buffered data into.
* @param bPos position in byte[] array to start extraction at.
* @param bAvail amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).
* @return The number of bytes successfully extracted into the provided byte[] array.
*/
int readResults(byte[] b, int bPos, int bAvail) { // package protected for access from I/O streams
if (buffer != null) {
int len = Math.min(available(), bAvail);
System.arraycopy(buffer, readPos, b, bPos, len);
readPos += len;
if (readPos >= pos) {
buffer = null; // so hasData() will return false, and this method can return -1
}
return len;
}
return eof ? -1 : 0;
}
/**
* Checks if a byte value is whitespace or not.
* Whitespace is taken to mean: space, tab, CR, LF
*
* @param byteToCheck the byte to check
* @return true if byte is whitespace, false otherwise
*/
protected static boolean isWhiteSpace(byte byteToCheck) {
switch (byteToCheck) {
case ' ':
case '\n':
case '\r':
case '\t':
return true;
default:
return false;
}
}
/**
* Resets this object to its initial newly constructed state.
*/
private void reset() {
buffer = null;
pos = 0;
readPos = 0;
currentLinePos = 0;
modulus = 0;
eof = false;
}
/**
* Encodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the
* Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].
*
* @param pObject Object to encode
* @return An object (of type byte[]) containing the Base-N encoded data which corresponds to the byte[] supplied.
* @throws IllegalArgumentException if the parameter supplied is not of type byte[]
*/
public Object encode(Object pObject) {
if (!(pObject instanceof byte[])) {
throw new IllegalArgumentException("Parameter supplied to Base-N encode is not a byte[]");
}
return encode((byte[]) pObject);
}
/**
* Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.
*
* @param pArray a byte array containing binary data
* @return A String containing only Base-N character data
*/
public String encodeToString(byte[] pArray) {
return StringUtil.newStringUtf8(encode(pArray));
}
/**
* Decodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the
* Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.
*
* @param pObject Object to decode
* @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.
* @throws IllegalArgumentException if the parameter supplied is not of type byte[]
*/
public Object decode(Object pObject) throws IllegalArgumentException {
if (pObject instanceof byte[]) {
return decode((byte[]) pObject);
} else if (pObject instanceof String) {
return decode((String) pObject);
} else {
throw new IllegalArgumentException("Parameter supplied to Base-N decode is not a byte[] or a String");
}
}
/**
* Decodes a String containing characters in the Base-N alphabet.
*
* @param pArray A String containing Base-N character data
* @return a byte array containing binary data
*/
public byte[] decode(String pArray) {
return decode(StringUtil.getBytesUtf8(pArray));
}
/**
* Decodes a byte[] containing characters in the Base-N alphabet.
*
* @param pArray A byte array containing Base-N character data
* @return a byte array containing binary data
*/
public byte[] decode(byte[] pArray) {
reset();
if (pArray == null || pArray.length == 0) {
return pArray;
}
decode(pArray, 0, pArray.length);
decode(pArray, 0, -1); // Notify decoder of EOF.
byte[] result = new byte[pos];
readResults(result, 0, result.length);
return result;
}
/**
* Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.
*
* @param pArray a byte array containing binary data
* @return A byte array containing only the basen alphabetic character data
*/
public byte[] encode(byte[] pArray) {
reset();
if (pArray == null || pArray.length == 0) {
return pArray;
}
encode(pArray, 0, pArray.length);
encode(pArray, 0, -1); // Notify encoder of EOF.
byte[] buf = new byte[pos - readPos];
readResults(buf, 0, buf.length);
return buf;
}
/**
* Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet.
* Uses UTF8 encoding.
*
* @param pArray a byte array containing binary data
* @return String containing only character data in the appropriate alphabet.
*/
public String encodeAsString(byte[] pArray) {
return StringUtil.newStringUtf8(encode(pArray));
}
/**
* Returns whether or not the <code>octet</code> is in the current alphabet.
* Does not allow whitespace or pad.
*
* @param octet The value to test
* @return <code>true</code> if the value is defined in the current alphabet, <code>false</code> otherwise.
*/
protected boolean isInAlphabet(byte octet) {
return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;
}
/**
* Tests a given byte array to see if it contains only valid characters within the alphabet.
* The method optionally treats whitespace and pad as valid.
*
* @param arrayOctet byte array to test
* @param allowWSPad if <code>true</code>, then whitespace and PAD are also allowed
* @return <code>true</code> if all bytes are valid characters in the alphabet or if the byte array is empty;
* <code>false</code>, otherwise
*/
public boolean isInAlphabet(byte[] arrayOctet, boolean allowWSPad) {
for (int i = 0; i < arrayOctet.length; i++) {
if (!isInAlphabet(arrayOctet[i]) &&
(!allowWSPad || (arrayOctet[i] != PAD) && !isWhiteSpace(arrayOctet[i]))) {
return false;
}
}
return true;
}
/**
* Tests a given String to see if it contains only valid characters within the alphabet.
* The method treats whitespace and PAD as valid.
*
* @param basen String to test
* @return <code>true</code> if all characters in the String are valid characters in the alphabet or if
* the String is empty; <code>false</code>, otherwise
* @see #isInAlphabet(byte[], boolean)
*/
public boolean isInAlphabet(String basen) {
return isInAlphabet(StringUtil.getBytesUtf8(basen), true);
}
/**
* Tests a given byte array to see if it contains any characters within the alphabet or PAD.
* <p/>
* Intended for use in checking line-ending arrays
*
* @param arrayOctet byte array to test
* @return <code>true</code> if any byte is a valid character in the alphabet or PAD; <code>false</code> otherwise
*/
protected boolean containsAlphabetOrPad(byte[] arrayOctet) {
if (arrayOctet == null) {
return false;
}
for (int i = 0; i < arrayOctet.length; i++) {
if (PAD == arrayOctet[i] || isInAlphabet(arrayOctet[i])) {
return true;
}
}
return false;
}
/**
* Calculates the amount of space needed to encode the supplied array.
*
* @param pArray byte[] array which will later be encoded
* @return amount of space needed to encoded the supplied array.
* Returns a long since a max-len array will require > Integer.MAX_VALUE
*/
public long getEncodedLength(byte[] pArray) {
// Calculate non-chunked size - rounded up to allow for padding
// cast to long is needed to avoid possibility of overflow
long len = ((pArray.length + unencodedBlockSize - 1) / unencodedBlockSize) * (long) encodedBlockSize;
if (lineLength > 0) { // We're using chunking
// Round up to nearest multiple
len += ((len + lineLength - 1) / lineLength) * chunkSeparatorLength;
}
return len;
}
/**
* Returns our current encode mode. True if we're URL-SAFE, false otherwise.
*
* @return true if we're in URL-SAFE mode, false otherwise.
* @since 1.4
*/
public boolean isUrlSafe() {
return this.encodeTable == URL_SAFE_ENCODE_TABLE;
}
/**
* <p>
* Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with
* the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last
* remaining bytes (if not multiple of 3).
* </p>
* <p>
* Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.
* http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
* </p>
*
* @param in byte[] array of binary data to base64 encode.
* @param inPos Position to start reading data from.
* @param inAvail Amount of bytes available from input for encoding.
*/
void encode(byte[] in, int inPos, int inAvail) {
if (eof) {
return;
}
// inAvail < 0 is how we're informed of EOF in the underlying data we're
// encoding.
if (inAvail < 0) {
eof = true;
if (0 == modulus && lineLength == 0) {
return; // no leftovers to process and not using chunking
}
ensureBufferSize(encodeSize);
int savedPos = pos;
switch (modulus) { // 0-2
case 1: // 8 bits = 6 + 2
buffer[pos++] = encodeTable[(bitWorkArea >> 2) & MASK_6BITS]; // top 6 bits
buffer[pos++] = encodeTable[(bitWorkArea << 4) & MASK_6BITS]; // remaining 2
// URL-SAFE skips the padding to further reduce size.
if (encodeTable == STANDARD_ENCODE_TABLE) {
buffer[pos++] = PAD;
buffer[pos++] = PAD;
}
break;
case 2: // 16 bits = 6 + 6 + 4
buffer[pos++] = encodeTable[(bitWorkArea >> 10) & MASK_6BITS];
buffer[pos++] = encodeTable[(bitWorkArea >> 4) & MASK_6BITS];
buffer[pos++] = encodeTable[(bitWorkArea << 2) & MASK_6BITS];
// URL-SAFE skips the padding to further reduce size.
if (encodeTable == STANDARD_ENCODE_TABLE) {
buffer[pos++] = PAD;
}
break;
}
currentLinePos += pos - savedPos; // keep track of current line position
// if currentPos == 0 we are at the start of a line, so don't add CRLF
if (lineLength > 0 && currentLinePos > 0) {
System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
pos += lineSeparator.length;
}
} else {
for (int i = 0; i < inAvail; i++) {
ensureBufferSize(encodeSize);
modulus = (modulus + 1) % BYTES_PER_UNENCODED_BLOCK;
int b = in[inPos++];
if (b < 0) {
b += 256;
}
bitWorkArea = (bitWorkArea << 8) + b; // BITS_PER_BYTE
if (0 == modulus) { // 3 bytes = 24 bits = 4 * 6 bits to extract
buffer[pos++] = encodeTable[(bitWorkArea >> 18) & MASK_6BITS];
buffer[pos++] = encodeTable[(bitWorkArea >> 12) & MASK_6BITS];
buffer[pos++] = encodeTable[(bitWorkArea >> 6) & MASK_6BITS];
buffer[pos++] = encodeTable[bitWorkArea & MASK_6BITS];
currentLinePos += BYTES_PER_ENCODED_BLOCK;
if (lineLength > 0 && lineLength <= currentLinePos) {
System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
pos += lineSeparator.length;
currentLinePos = 0;
}
}
}
}
}
/**
* <p>
* Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once
* with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1"
* call is not necessary when decoding, but it doesn't hurt, either.
* </p>
* <p>
* Ignores all non-base64 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are
* silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in,
* garbage-out philosophy: it will not check the provided data for validity.
* </p>
* <p>
* Thanks to "commons" project in ws.apache.org for the bitwise operations, and general approach.
* http://svn.apache.org/repos/asf/webservices/commons/trunk/modules/util/
* </p>
*
* @param in byte[] array of ascii data to base64 decode.
* @param inPos Position to start reading data from.
* @param inAvail Amount of bytes available from input for encoding.
*/
void decode(byte[] in, int inPos, int inAvail) {
if (eof) {
return;
}
if (inAvail < 0) {
eof = true;
}
for (int i = 0; i < inAvail; i++) {
ensureBufferSize(decodeSize);
byte b = in[inPos++];
if (b == PAD) {
// We're done.
eof = true;
break;
} else {
if (b >= 0 && b < DECODE_TABLE.length) {
int result = DECODE_TABLE[b];
if (result >= 0) {
modulus = (modulus + 1) % BYTES_PER_ENCODED_BLOCK;
bitWorkArea = (bitWorkArea << BITS_PER_ENCODED_BYTE) + result;
if (modulus == 0) {
buffer[pos++] = (byte) ((bitWorkArea >> 16) & MASK_8BITS);
buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
buffer[pos++] = (byte) (bitWorkArea & MASK_8BITS);
}
}
}
}
}
// Two forms of EOF as far as base64 decoder is concerned: actual
// EOF (-1) and first time '=' character is encountered in stream.
// This approach makes the '=' padding characters completely optional.
if (eof && modulus != 0) {
ensureBufferSize(decodeSize);
// We have some spare bits remaining
// Output all whole multiples of 8 bits and ignore the rest
switch (modulus) {
// case 1: // 6 bits - ignore entirely
// break;
case 2: // 12 bits = 8 + 4
bitWorkArea = bitWorkArea >> 4; // dump the extra 4 bits
buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
break;
case 3: // 18 bits = 8 + 8 + 2
bitWorkArea = bitWorkArea >> 2; // dump 2 bits
buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
break;
}
}
}
/**
* Returns whether or not the <code>octet</code> is in the base 64 alphabet.
*
* @param octet The value to test
* @return <code>true</code> if the value is defined in the the base 64 alphabet, <code>false</code> otherwise.
* @since 1.4
*/
public static boolean isBase64(byte octet) {
return octet == PAD_DEFAULT || (octet >= 0 && octet < DECODE_TABLE.length && DECODE_TABLE[octet] != -1);
}
/**
* Tests a given String to see if it contains only valid characters within the Base64 alphabet. Currently the
* method treats whitespace as valid.
*
* @param base64 String to test
* @return <code>true</code> if all characters in the String are valid characters in the Base64 alphabet or if
* the String is empty; <code>false</code>, otherwise
* @since 1.5
*/
public static boolean isBase64(String base64) {
return isBase64(StringUtil.getBytesUtf8(base64));
}
/**
* Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the
* method treats whitespace as valid.
*
* @param arrayOctet byte array to test
* @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the byte array is empty;
* <code>false</code>, otherwise
* @since 1.5
*/
public static boolean isBase64(byte[] arrayOctet) {
for (int i = 0; i < arrayOctet.length; i++) {
if (!isBase64(arrayOctet[i]) && !isWhiteSpace(arrayOctet[i])) {
return false;
}
}
return true;
}
/**
* Encodes binary data using the base64 algorithm but does not chunk the output.
*
* @param binaryData binary data to encode
* @return byte[] containing Base64 characters in their UTF-8 representation.
*/
public static byte[] encodeBase64(byte[] binaryData) {
return encodeBase64(binaryData, false);
}
/**
* Encodes binary data using the base64 algorithm but does not chunk the output.
* <p/>
* NOTE: We changed the behaviour of this method from multi-line chunking (commons-codec-1.4) to
* single-line non-chunking (commons-codec-1.5).
*
* @param binaryData binary data to encode
* @return String containing Base64 characters.
* @since 1.4 (NOTE: 1.4 chunked the output, whereas 1.5 does not).
*/
public static String encodeBase64String(byte[] binaryData) {
return StringUtil.newStringUtf8(encodeBase64(binaryData, false));
}
/**
* Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
* url-safe variation emits - and _ instead of + and / characters.
*
* @param binaryData binary data to encode
* @return byte[] containing Base64 characters in their UTF-8 representation.
* @since 1.4
*/
public static byte[] encodeBase64URLSafe(byte[] binaryData) {
return encodeBase64(binaryData, false, true);
}
/**
* Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The
* url-safe variation emits - and _ instead of + and / characters.
*
* @param binaryData binary data to encode
* @return String containing Base64 characters
* @since 1.4
*/
public static String encodeBase64URLSafeString(byte[] binaryData) {
return StringUtil.newStringUtf8(encodeBase64(binaryData, false, true));
}
/**
* Encodes binary data using the base64 algorithm and chunks the encoded output into 76 character blocks
*
* @param binaryData binary data to encode
* @return Base64 characters chunked in 76 character blocks
*/
public static byte[] encodeBase64Chunked(byte[] binaryData) {
return encodeBase64(binaryData, true);
}
/**
* Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
*
* @param binaryData Array containing binary data to encode.
* @param isChunked if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
* @return Base64-encoded data.
* @throws IllegalArgumentException Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
*/
public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {
return encodeBase64(binaryData, isChunked, false);
}
/**
* Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
*
* @param binaryData Array containing binary data to encode.
* @param isChunked if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
* @param urlSafe if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.
* @return Base64-encoded data.
* @throws IllegalArgumentException Thrown when the input array needs an output array bigger than {@link Integer#MAX_VALUE}
* @since 1.4
*/
public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe) {
return encodeBase64(binaryData, isChunked, urlSafe, Integer.MAX_VALUE);
}
/**
* Encodes binary data using the base64 algorithm, optionally chunking the output into 76 character blocks.
*
* @param binaryData Array containing binary data to encode.
* @param isChunked if <code>true</code> this encoder will chunk the base64 output into 76 character blocks
* @param urlSafe if <code>true</code> this encoder will emit - and _ instead of the usual + and / characters.
* @param maxResultSize The maximum result size to accept.
* @return Base64-encoded data.
* @throws IllegalArgumentException Thrown when the input array needs an output array bigger than maxResultSize
* @since 1.4
*/
public static byte[] encodeBase64(byte[] binaryData, boolean isChunked, boolean urlSafe, int maxResultSize) {
if (binaryData == null || binaryData.length == 0) {
return binaryData;
}
// Create this so can use the super-class method
// Also ensures that the same roundings are performed by the ctor and the code
Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);
long len = b64.getEncodedLength(binaryData);
if (len > maxResultSize) {
throw new IllegalArgumentException("Input array too big, the output array would be bigger (" +
len +
") than the specified maximum size of " +
maxResultSize);
}
return b64.encode(binaryData);
}
/**
* Decodes a Base64 String into octets
*
* @param base64String String containing Base64 data
* @return Array containing decoded data.
* @since 1.4
*/
public static byte[] decodeBase64(String base64String) {
return new Base64().decode(base64String);
}
/**
* Decodes Base64 data into octets
*
* @param base64Data Byte array containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decodeBase64(byte[] base64Data) {
return new Base64().decode(base64Data);
}
// Implementation of the Encoder Interface
// Implementation of integer encoding used for crypto
/**
* Decodes a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
*
* @param pArray a byte array containing base64 character data
* @return A BigInteger
* @since 1.4
*/
public static BigInteger decodeInteger(byte[] pArray) {
return new BigInteger(1, decodeBase64(pArray));
}
/**
* Encodes to a byte64-encoded integer according to crypto standards such as W3C's XML-Signature
*
* @param bigInt a BigInteger
* @return A byte array containing base64 character data
* @throws NullPointerException if null is passed in
* @since 1.4
*/
public static byte[] encodeInteger(BigInteger bigInt) {
if (bigInt == null) {
throw new NullPointerException("encodeInteger called with null parameter");
}
return encodeBase64(toIntegerBytes(bigInt), false);
}
/**
* Returns a byte-array representation of a <code>BigInteger</code> without sign bit.
*
* @param bigInt <code>BigInteger</code> to be converted
* @return a byte array representation of the BigInteger parameter
*/
static byte[] toIntegerBytes(BigInteger bigInt) {
int bitlen = bigInt.bitLength();
// round bitlen
bitlen = ((bitlen + 7) >> 3) << 3;
byte[] bigBytes = bigInt.toByteArray();
if (((bigInt.bitLength() % 8) != 0) && (((bigInt.bitLength() / 8) + 1) == (bitlen / 8))) {
return bigBytes;
}
// set up params for copying everything but sign bit
int startSrc = 0;
int len = bigBytes.length;
// if bigInt is exactly byte-aligned, just skip signbit in copy
if ((bigInt.bitLength() % 8) == 0) {
startSrc = 1;
len--;
}
int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
byte[] resizedBytes = new byte[bitlen / 8];
System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
return resizedBytes;
}
}
class StringUtil {
private static final String[] COLOURS_STR = new String[]{"red", "green", "cyan", "purple", "white"};
private static final Map<String, Color> COLOR_MAP = new HashMap<String, Color>();
public static String join(final String[] s) {
final int l = s.length;
switch (l) {
case 0:
return "";
case 1:
return s[0];
}
final String d = ", ";
final int x = d.length();
int n = 0, i;
for (i = 0; i < l; i++) {
n += s[i].length() + x;
}
final StringBuffer buf = new StringBuffer(n - x);
i = 0;
boolean c = true;
while (c) {
buf.append(s[i]);
i++;
c = i < l;
if (c) {
buf.append(d);
}
}
return buf.toString();
}
/**
* Draws a line on the screen at the specified index. Default is green.
* <p/>
* Available colours: red, green, cyan, purple, white.
*
* @param render The Graphics object to be used.
* @param row The index where you want the text.
* @param text The text you want to render. Colours can be set like [red].
*/
public static void drawLine(Graphics render, int row, String text) {
FontMetrics metrics = render.getFontMetrics();
int height = metrics.getHeight() + 4; // height + gap
int y = row * height + 15 + 19;
String[] texts = text.split("\\[");
int xIdx = 7;
Color cur = Color.GREEN;
for (String t : texts) {
for (@SuppressWarnings("unused") String element : COLOURS_STR) {
// String element = COLOURS_STR[i];
// Don't search for a starting '[' cause it they don't exists.
// we split on that.
int endIdx = t.indexOf(']');
if (endIdx != -1) {
String colorName = t.substring(0, endIdx);
if (COLOR_MAP.containsKey(colorName)) {
cur = COLOR_MAP.get(colorName);
} else {
try {
Field f = Color.class.getField(colorName);
int mods = f.getModifiers();
if (Modifier.isPublic(mods) && Modifier.isStatic(mods) && Modifier.isFinal(mods)) {
cur = (Color) f.get(null);
COLOR_MAP.put(colorName, cur);
}
} catch (Exception ignored) {
}
}
t = t.replace(colorName + "]", "");
}
}
render.setColor(Color.BLACK);
render.drawString(t, xIdx, y + 1);
render.setColor(cur);
render.drawString(t, xIdx, y);
xIdx += metrics.stringWidth(t);
}
}
public static String throwableToString(Throwable t) {
if (t != null) {
Writer exception = new StringWriter();
PrintWriter printWriter = new PrintWriter(exception);
t.printStackTrace(printWriter);
return exception.toString();
}
return "";
}
public static byte[] getBytesUtf8(String string) {
try {
return string.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(e);
}
}
public static String newStringUtf8(byte[] bytes) {
if (bytes == null) {
return null;
}
try {
return new String(bytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(e);
}
}
}
]]>