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LAX1DUDE 2022-05-30 01:19:29 -07:00
parent 7a3989e88e
commit 2d1b1686b5
80 changed files with 25073 additions and 10429 deletions
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.gitignore vendored
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@ -12,3 +12,5 @@ bin
/lwjgl-rundir/texturepacks
/lwjgl-rundir/downloads
/lwjgl-rundir/options.txt
/bukkit/rundir*
/bukkit/server/craftbukkit-src/*

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build.gradle
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@ -63,7 +63,7 @@ teavm {
classesToPreserve = null;
stopOnErrors = false;
optimizationLevel = "FULL"; //org.teavm.vm.TeaVMOptimizationLevel.SIMPLE;
optimizationLevel = "ADVANCED"; //org.teavm.vm.TeaVMOptimizationLevel.SIMPLE;
fastGlobalAnalysis = false;
targetType = "JAVASCRIPT"; //org.teavm.tooling.TeaVMTargetType.JAVASCRIPT;
cacheDirectory = null;

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bukkit/src/main/java/net/lax1dude/eaglercraft/beta/server/Base64.java Normal file
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/*
* 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.
*/
package net.lax1dude.eaglercraft.beta.server;
import java.math.BigInteger;
import java.nio.charset.Charset;
/**
* Provides Base64 encoding and decoding as defined by
* <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>.
*
* <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:
* </p>
* <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>
* The URL-safe parameter is only applied to encode operations. Decoding
* seamlessly handles both modes.
* </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 thread-safe.
* </p>
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
* @since 1.0
*/
public class Base64 extends BaseNCodec {
/**
* 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;
/**
* 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.
*
* 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.
*
* 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).
*
* 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 = {
// 0 1 2 3 4 5 6 7 8 9 A B C D E F
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 00-0f
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10-1f
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, // 20-2f + - /
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, // 30-3f 0-9
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 40-4f A-O
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63, // 50-5f P-Z _
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, // 60-6f a-o
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 // 70-7a p-z
};
/**
* Base64 uses 6-bit fields.
*/
/** Mask used to extract 6 bits, used when encoding */
private static final int MASK_6BITS = 0x3f;
/** Mask used to extract 4 bits, used when decoding final trailing character. */
private static final int MASK_4BITS = 0xf;
/** Mask used to extract 2 bits, used when decoding final trailing character. */
private static final int MASK_2BITS = 0x3;
// 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().
/**
* Decodes Base64 data into octets.
* <p>
* <b>Note:</b> this method seamlessly handles data encoded in URL-safe or
* normal mode.
* </p>
*
* @param base64Data Byte array containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decodeBase64(final byte[] base64Data) {
return new Base64().decode(base64Data);
}
/**
* Decodes a Base64 String into octets.
* <p>
* <b>Note:</b> this method seamlessly handles data encoded in URL-safe or
* normal mode.
* </p>
*
* @param base64String String containing Base64 data
* @return Array containing decoded data.
* @since 1.4
*/
public static byte[] decodeBase64(final String base64String) {
return new Base64().decode(base64String);
}
// 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(final byte[] pArray) {
return new BigInteger(1, decodeBase64(pArray));
}
/**
* 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(final byte[] binaryData) {
return encodeBase64(binaryData, 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} 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(final byte[] binaryData, final 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} this encoder will chunk the base64 output
* into 76 character blocks
* @param urlSafe if {@code true} this encoder will emit - and _ instead of
* the usual + and / characters. <b>Note: no padding is added
* when encoding using the URL-safe alphabet.</b>
* @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(final byte[] binaryData, final boolean isChunked, final 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} this encoder will chunk the base64
* output into 76 character blocks
* @param urlSafe if {@code true} this encoder will emit - and _ instead
* of the usual + and / characters. <b>Note: no padding is
* added when encoding using the URL-safe alphabet.</b>
* @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(final byte[] binaryData, final boolean isChunked, final boolean urlSafe,
final 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
final Base64 b64 = isChunked ? new Base64(urlSafe) : new Base64(0, CHUNK_SEPARATOR, urlSafe);
final 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);
}
/**
* 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(final byte[] binaryData) {
return encodeBase64(binaryData, true);
}
/**
* Encodes binary data using the base64 algorithm but does not chunk the output.
*
* NOTE: We changed the behavior 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(final byte[] binaryData) {
return new String(encodeBase64(binaryData, false), Charset.forName("UTF-8"));
}
/**
* 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. <b>Note: no padding is added.</b>
*
* @param binaryData binary data to encode
* @return byte[] containing Base64 characters in their UTF-8 representation.
* @since 1.4
*/
public static byte[] encodeBase64URLSafe(final 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. <b>Note: no padding is added.</b>
*
* @param binaryData binary data to encode
* @return String containing Base64 characters
* @since 1.4
*/
public static String encodeBase64URLSafeString(final byte[] binaryData) {
return new String(encodeBase64(binaryData, false, true), Charset.forName("UTF-8"));
}
/**
* Encodes to a byte64-encoded integer according to crypto standards such as
* W3C's XML-Signature.
*
* @param bigInteger a BigInteger
* @return A byte array containing base64 character data
* @throws NullPointerException if null is passed in
* @since 1.4
*/
public static byte[] encodeInteger(final BigInteger bigInteger) {
return encodeBase64(toIntegerBytes(bigInteger), false);
}
/**
* 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} if all bytes are valid characters in the Base64 alphabet
* or if the byte array is empty; {@code false}, otherwise
* @deprecated 1.5 Use {@link #isBase64(byte[])}, will be removed in 2.0.
*/
@Deprecated
public static boolean isArrayByteBase64(final byte[] arrayOctet) {
return isBase64(arrayOctet);
}
/**
* Returns whether or not the {@code octet} is in the base 64 alphabet.
*
* @param octet The value to test
* @return {@code true} if the value is defined in the the base 64 alphabet,
* {@code false} otherwise.
* @since 1.4
*/
public static boolean isBase64(final byte octet) {
return octet == PAD_DEFAULT || (octet >= 0 && octet < DECODE_TABLE.length && DECODE_TABLE[octet] != -1);
}
/**
* 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} if all bytes are valid characters in the Base64 alphabet
* or if the byte array is empty; {@code false}, otherwise
* @since 1.5
*/
public static boolean isBase64(final byte[] arrayOctet) {
for (int i = 0; i < arrayOctet.length; i++) {
if (!isBase64(arrayOctet[i]) && !isWhiteSpace(arrayOctet[i])) {
return false;
}
}
return true;
}
/**
* 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} if all characters in the String are valid characters in
* the Base64 alphabet or if the String is empty; {@code false},
* otherwise
* @since 1.5
*/
public static boolean isBase64(final String base64) {
return isBase64(base64.getBytes(Charset.forName("UTF-8")));
}
/**
* Returns a byte-array representation of a {@code BigInteger} without sign bit.
*
* @param bigInt {@code BigInteger} to be converted
* @return a byte array representation of the BigInteger parameter
*/
static byte[] toIntegerBytes(final BigInteger bigInt) {
int bitlen = bigInt.bitLength();
// round bitlen
bitlen = ((bitlen + 7) >> 3) << 3;
final 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--;
}
final int startDst = bitlen / 8 - len; // to pad w/ nulls as per spec
final byte[] resizedBytes = new byte[bitlen / 8];
System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, len);
return resizedBytes;
}
/**
* 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
* &gt; 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;}
*/
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;}
*/
private final int encodeSize;
/**
* 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>
* 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>
* When decoding all variants are supported.
* </p>
*
* @param urlSafe if {@code true}, URL-safe encoding is used. In most cases this
* should be set to {@code false}.
* @since 1.4
*/
public Base64(final 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 &lt;= 0, then the output will not be divided
* into lines (chunks). Ignored when decoding.
* @since 1.4
*/
public Base64(final 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 &lt;= 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(final int lineLength, final 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 &lt;= 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.
* <b>Note: no padding is added when using the URL-safe
* alphabet.</b>
* @throws IllegalArgumentException Thrown when the {@code lineSeparator}
* contains Base64 characters.
* @since 1.4
*/
public Base64(final int lineLength, final byte[] lineSeparator, final boolean urlSafe) {
this(lineLength, lineSeparator, urlSafe, CodecPolicy.LENIANT);
}
/**
* 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 &lt;= 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.
* <b>Note: no padding is added when using the URL-safe
* alphabet.</b>
* @param decodingPolicy The decoding policy.
* @throws IllegalArgumentException Thrown when the {@code lineSeparator}
* contains Base64 characters.
* @since 1.15
*/
public Base64(final int lineLength, final byte[] lineSeparator, final boolean urlSafe,
final CodecPolicy decodingPolicy) {
super(BYTES_PER_UNENCODED_BLOCK, BYTES_PER_ENCODED_BLOCK, lineLength,
lineSeparator == null ? 0 : lineSeparator.length, PAD_DEFAULT, decodingPolicy);
// 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)) {
final String sep = new String(lineSeparator, Charset.forName("UTF-8"));
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;
}
// Implementation of the Encoder Interface
/**
* <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 decoding.
* @param context the context to be used
*/
@Override
void decode(final byte[] in, int inPos, final int inAvail, final Context context) {
if (context.eof) {
return;
}
if (inAvail < 0) {
context.eof = true;
}
for (int i = 0; i < inAvail; i++) {
final byte[] buffer = ensureBufferSize(decodeSize, context);
final byte b = in[inPos++];
if (b == pad) {
// We're done.
context.eof = true;
break;
}
if (b >= 0 && b < DECODE_TABLE.length) {
final int result = DECODE_TABLE[b];
if (result >= 0) {
context.modulus = (context.modulus + 1) % BYTES_PER_ENCODED_BLOCK;
context.ibitWorkArea = (context.ibitWorkArea << BITS_PER_ENCODED_BYTE) + result;
if (context.modulus == 0) {
buffer[context.pos++] = (byte) ((context.ibitWorkArea >> 16) & MASK_8BITS);
buffer[context.pos++] = (byte) ((context.ibitWorkArea >> 8) & MASK_8BITS);
buffer[context.pos++] = (byte) (context.ibitWorkArea & 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 (context.eof && context.modulus != 0) {
final byte[] buffer = ensureBufferSize(decodeSize, context);
// We have some spare bits remaining
// Output all whole multiples of 8 bits and ignore the rest
switch (context.modulus) {
// case 0 : // impossible, as excluded above
case 1: // 6 bits - either ignore entirely, or raise an exception
validateTrailingCharacter();
break;
case 2: // 12 bits = 8 + 4
validateCharacter(MASK_4BITS, context);
context.ibitWorkArea = context.ibitWorkArea >> 4; // dump the extra 4 bits
buffer[context.pos++] = (byte) ((context.ibitWorkArea) & MASK_8BITS);
break;
case 3: // 18 bits = 8 + 8 + 2
validateCharacter(MASK_2BITS, context);
context.ibitWorkArea = context.ibitWorkArea >> 2; // dump 2 bits
buffer[context.pos++] = (byte) ((context.ibitWorkArea >> 8) & MASK_8BITS);
buffer[context.pos++] = (byte) ((context.ibitWorkArea) & MASK_8BITS);
break;
default:
throw new IllegalStateException("Impossible modulus " + context.modulus);
}
}
}
/**
* <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, to flush last
* remaining bytes (if not multiple of 3).
* </p>
* <p>
* <b>Note: no padding is added when encoding using the URL-safe alphabet.</b>
* </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.
* @param context the context to be used
*/
@Override
void encode(final byte[] in, int inPos, final int inAvail, final Context context) {
if (context.eof) {
return;
}
// inAvail < 0 is how we're informed of EOF in the underlying data we're
// encoding.
if (inAvail < 0) {
context.eof = true;
if (0 == context.modulus && lineLength == 0) {
return; // no leftovers to process and not using chunking
}
final byte[] buffer = ensureBufferSize(encodeSize, context);
final int savedPos = context.pos;
switch (context.modulus) { // 0-2
case 0: // nothing to do here
break;
case 1: // 8 bits = 6 + 2
// top 6 bits:
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 2) & MASK_6BITS];
// remaining 2:
buffer[context.pos++] = encodeTable[(context.ibitWorkArea << 4) & MASK_6BITS];
// URL-SAFE skips the padding to further reduce size.
if (encodeTable == STANDARD_ENCODE_TABLE) {
buffer[context.pos++] = pad;
buffer[context.pos++] = pad;
}
break;
case 2: // 16 bits = 6 + 6 + 4
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 10) & MASK_6BITS];
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 4) & MASK_6BITS];
buffer[context.pos++] = encodeTable[(context.ibitWorkArea << 2) & MASK_6BITS];
// URL-SAFE skips the padding to further reduce size.
if (encodeTable == STANDARD_ENCODE_TABLE) {
buffer[context.pos++] = pad;
}
break;
default:
throw new IllegalStateException("Impossible modulus " + context.modulus);
}
context.currentLinePos += context.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 && context.currentLinePos > 0) {
System.arraycopy(lineSeparator, 0, buffer, context.pos, lineSeparator.length);
context.pos += lineSeparator.length;
}
} else {
for (int i = 0; i < inAvail; i++) {
final byte[] buffer = ensureBufferSize(encodeSize, context);
context.modulus = (context.modulus + 1) % BYTES_PER_UNENCODED_BLOCK;
int b = in[inPos++];
if (b < 0) {
b += 256;
}
context.ibitWorkArea = (context.ibitWorkArea << 8) + b; // BITS_PER_BYTE
if (0 == context.modulus) { // 3 bytes = 24 bits = 4 * 6 bits to extract
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 18) & MASK_6BITS];
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 12) & MASK_6BITS];
buffer[context.pos++] = encodeTable[(context.ibitWorkArea >> 6) & MASK_6BITS];
buffer[context.pos++] = encodeTable[context.ibitWorkArea & MASK_6BITS];
context.currentLinePos += BYTES_PER_ENCODED_BLOCK;
if (lineLength > 0 && lineLength <= context.currentLinePos) {
System.arraycopy(lineSeparator, 0, buffer, context.pos, lineSeparator.length);
context.pos += lineSeparator.length;
context.currentLinePos = 0;
}
}
}
}
}
/**
* Returns whether or not the {@code octet} is in the Base64 alphabet.
*
* @param octet The value to test
* @return {@code true} if the value is defined in the the Base64 alphabet
* {@code false} otherwise.
*/
@Override
protected boolean isInAlphabet(final byte octet) {
return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;
}
/**
* 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;
}
/**
* Validates whether decoding the final trailing character is possible in the
* context of the set of possible base 64 values.
*
* <p>
* The character is valid if the lower bits within the provided mask are zero.
* This is used to test the final trailing base-64 digit is zero in the bits
* that will be discarded.
*
* @param emptyBitsMask The mask of the lower bits that should be empty
* @param context the context to be used
*
* @throws IllegalArgumentException if the bits being checked contain any
* non-zero value
*/
private void validateCharacter(final int emptyBitsMask, final Context context) {
if (isStrictDecoding() && (context.ibitWorkArea & emptyBitsMask) != 0) {
throw new IllegalArgumentException(
"Strict decoding: Last encoded character (before the paddings if any) is a valid base 64 alphabet but not a possible encoding. "
+ "Expected the discarded bits from the character to be zero.");
}
}
/**
* Validates whether decoding allows an entire final trailing character that
* cannot be used for a complete byte.
*
* @throws IllegalArgumentException if strict decoding is enabled
*/
private void validateTrailingCharacter() {
if (isStrictDecoding()) {
throw new IllegalArgumentException(
"Strict decoding: Last encoded character (before the paddings if any) is a valid base 64 alphabet but not a possible encoding. "
+ "Decoding requires at least two trailing 6-bit characters to create bytes.");
}
}
}

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package net.lax1dude.eaglercraft.beta.server;
import java.nio.charset.Charset;
import java.util.Arrays;
public abstract class BaseNCodec {
static enum CodecPolicy {
STRICT, LENIANT;
}
/**
* Holds thread context so classes can be thread-safe.
*
* This class is not itself thread-safe; each thread must allocate its own copy.
*
* @since 1.7
*/
static class Context {
/**
* 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.
*/
int ibitWorkArea;
/**
* 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.
*/
long lbitWorkArea;
/**
* Buffer for streaming.
*/
byte[] buffer;
/**
* Position where next character should be written in the buffer.
*/
int pos;
/**
* Position where next character should be read from the buffer.
*/
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.
*/
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 &gt; 0).
*/
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.
*/
int modulus;
Context() {
}
/**
* Returns a String useful for debugging (especially within a debugger.)
*
* @return a String useful for debugging.
*/
@SuppressWarnings("boxing") // OK to ignore boxing here
@Override
public String toString() {
return String.format(
"%s[buffer=%s, currentLinePos=%s, eof=%s, ibitWorkArea=%s, lbitWorkArea=%s, "
+ "modulus=%s, pos=%s, readPos=%s]",
this.getClass().getSimpleName(), Arrays.toString(buffer), currentLinePos, eof, ibitWorkArea,
lbitWorkArea, modulus, pos, readPos);
}
}
/**
* EOF
*
* @since 1.7
*/
static final int EOF = -1;
/**
* MIME chunk size per RFC 2045 section 6.8.
*
* <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>
* 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;
/**
* The maximum size buffer to allocate.
*
* <p>
* This is set to the same size used in the JDK {@code java.util.ArrayList}:
* </p>
* <blockquote> Some VMs reserve some header words in an array. Attempts to
* allocate larger arrays may result in OutOfMemoryError: Requested array size
* exceeds VM limit. </blockquote>
*/
private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
/** 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
/**
* Chunk separator per RFC 2045 section 2.1.
*
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
*/
static final byte[] CHUNK_SEPARATOR = { '\r', '\n' };
/**
* Compares two {@code int} values numerically treating the values as unsigned.
* Taken from JDK 1.8.
*
* <p>
* TODO: Replace with JDK 1.8 Integer::compareUnsigned(int, int).
* </p>
*
* @param x the first {@code int} to compare
* @param y the second {@code int} to compare
* @return the value {@code 0} if {@code x == y}; a value less than {@code 0} if
* {@code x < y} as unsigned values; and a value greater than {@code 0}
* if {@code x > y} as unsigned values
*/
private static int compareUnsigned(final int xx, final int yy) {
int x = xx + Integer.MIN_VALUE;
int y = yy + Integer.MIN_VALUE;
return (x < y) ? -1 : ((x == y) ? 0 : 1);
}
/**
* Create a positive capacity at least as large the minimum required capacity.
* If the minimum capacity is negative then this throws an OutOfMemoryError as
* no array can be allocated.
*
* @param minCapacity the minimum capacity
* @return the capacity
* @throws OutOfMemoryError if the {@code minCapacity} is negative
*/
private static int createPositiveCapacity(final int minCapacity) {
if (minCapacity < 0) {
// overflow
throw new OutOfMemoryError("Unable to allocate array size: " + (minCapacity & 0xffffffffL));
}
// This is called when we require buffer expansion to a very big array.
// Use the conservative maximum buffer size if possible, otherwise the biggest
// required.
//
// Note: In this situation JDK 1.8 java.util.ArrayList returns
// Integer.MAX_VALUE.
// This excludes some VMs that can exceed MAX_BUFFER_SIZE but not allocate a
// full
// Integer.MAX_VALUE length array.
// The result is that we may have to allocate an array of this size more than
// once if
// the capacity must be expanded again.
return (minCapacity > MAX_BUFFER_SIZE) ? minCapacity : MAX_BUFFER_SIZE;
}
/**
* Gets a copy of the chunk separator per RFC 2045 section 2.1.
*
* @return the chunk separator
* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
* @since 1.15
*/
public static byte[] getChunkSeparator() {
return CHUNK_SEPARATOR.clone();
}
/**
* 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(final byte byteToCheck) {
switch (byteToCheck) {
case ' ':
case '\n':
case '\r':
case '\t':
return true;
default:
return false;
}
}
/**
* Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}.
*
* @param context the context to be used
* @param minCapacity the minimum required capacity
* @return the resized byte[] buffer
* @throws OutOfMemoryError if the {@code minCapacity} is negative
*/
private static byte[] resizeBuffer(final Context context, final int minCapacity) {
// Overflow-conscious code treats the min and new capacity as unsigned.
final int oldCapacity = context.buffer.length;
int newCapacity = oldCapacity * DEFAULT_BUFFER_RESIZE_FACTOR;
if (compareUnsigned(newCapacity, minCapacity) < 0) {
newCapacity = minCapacity;
}
if (compareUnsigned(newCapacity, MAX_BUFFER_SIZE) > 0) {
newCapacity = createPositiveCapacity(minCapacity);
}
final byte[] b = new byte[newCapacity];
System.arraycopy(context.buffer, 0, b, 0, context.buffer.length);
context.buffer = b;
return b;
}
/**
* @deprecated Use {@link #pad}. Will be removed in 2.0.
*/
@Deprecated
protected final byte PAD = PAD_DEFAULT; // instance variable just in case it needs to vary later
protected final byte pad; // instance variable just in case it needs to vary later
/**
* 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