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Core ACS AEM Commons OSGi Bundle. Includes commons utilities.
/*
* Copyright (C) 2014 jsonwebtoken.io
*
* 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 acscommons.io.jsonwebtoken.io;
import java.util.Arrays;
/**
* A very fast and memory efficient class to encode and decode to and from BASE64 or BASE64URL in full accordance
* with RFC 4648.
*
* Based initially on MigBase64 with continued modifications for Base64 URL support and JDK-standard code formatting.
*
* This encode/decode algorithm doesn't create any temporary arrays as many other codecs do, it only
* allocates the resulting array. This produces less garbage and it is possible to handle arrays twice
* as large as algorithms that create a temporary array.
*
* There is also a "fast" version of all decode methods that works the same way as the normal ones, but
* has a few demands on the decoded input. Normally though, these fast versions should be used if the source if
* the input is known and it hasn't bee tampered with.
*
* @author Mikael Grev
* @author Les Hazlewood
* @since 0.10.0
*/
@SuppressWarnings("Duplicates")
final class Base64 { //final and package-protected on purpose
private static final char[] BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
private static final char[] BASE64URL_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".toCharArray();
private static final int[] BASE64_IALPHABET = new int[256];
private static final int[] BASE64URL_IALPHABET = new int[256];
private static final int IALPHABET_MAX_INDEX = BASE64_IALPHABET.length - 1;
static {
Arrays.fill(BASE64_IALPHABET, -1);
System.arraycopy(BASE64_IALPHABET, 0, BASE64URL_IALPHABET, 0, BASE64_IALPHABET.length);
for (int i = 0, iS = BASE64_ALPHABET.length; i < iS; i++) {
BASE64_IALPHABET[BASE64_ALPHABET[i]] = i;
BASE64URL_IALPHABET[BASE64URL_ALPHABET[i]] = i;
}
BASE64_IALPHABET['='] = 0;
BASE64URL_IALPHABET['='] = 0;
}
static final Base64 DEFAULT = new Base64(false);
static final Base64 URL_SAFE = new Base64(true);
private final boolean urlsafe;
private final char[] ALPHABET;
private final int[] IALPHABET;
private Base64(boolean urlsafe) {
this.urlsafe = urlsafe;
this.ALPHABET = urlsafe ? BASE64URL_ALPHABET : BASE64_ALPHABET;
this.IALPHABET = urlsafe ? BASE64URL_IALPHABET : BASE64_IALPHABET;
}
// ****************************************************************************************
// * char[] version
// ****************************************************************************************
private String getName() {
return urlsafe ? "base64url" : "base64"; // RFC 4648 codec names are all lowercase
}
/**
* Encodes a raw byte array into a BASE64 char[] representation in accordance with RFC 2045.
*
* @param sArr The bytes to convert. If null or length 0 an empty array will be returned.
* @param lineSep Optional "\r\n" after 76 characters, unless end of file.
* No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
* little faster.
* @return A BASE64 encoded array. Never null.
*/
private char[] encodeToChar(byte[] sArr, boolean lineSep) {
// Check special case
int sLen = sArr != null ? sArr.length : 0;
if (sLen == 0) {
return new char[0];
}
int eLen = (sLen / 3) * 3; // # of bytes that can encode evenly into 24-bit chunks
int left = sLen - eLen; // # of bytes that remain after 24-bit chunking. Always 0, 1 or 2
int cCnt = (((sLen - 1) / 3 + 1) << 2); // # of base64-encoded characters including padding
int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned char array with padding and any line separators
int padCount = 0;
if (left == 2) {
padCount = 1;
} else if (left == 1) {
padCount = 2;
}
char[] dArr = new char[urlsafe ? (dLen - padCount) : dLen];
// Encode even 24-bits
for (int s = 0, d = 0, cc = 0; s < eLen; ) {
// Copy next three bytes into lower 24 bits of int, paying attension to sign.
int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
// Encode the int into four chars
dArr[d++] = ALPHABET[(i >>> 18) & 0x3f];
dArr[d++] = ALPHABET[(i >>> 12) & 0x3f];
dArr[d++] = ALPHABET[(i >>> 6) & 0x3f];
dArr[d++] = ALPHABET[i & 0x3f];
// Add optional line separator
if (lineSep && ++cc == 19 && d < dLen - 2) {
dArr[d++] = '\r';
dArr[d++] = '\n';
cc = 0;
}
}
// Pad and encode last bits if source isn't even 24 bits.
if (left > 0) {
// Prepare the int
int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
// Set last four chars
dArr[dLen - 4] = ALPHABET[i >> 12];
dArr[dLen - 3] = ALPHABET[(i >>> 6) & 0x3f];
//dArr[dLen - 2] = left == 2 ? ALPHABET[i & 0x3f] : '=';
//dArr[dLen - 1] = '=';
if (left == 2) {
dArr[dLen - 2] = ALPHABET[i & 0x3f];
} else if (!urlsafe) { // if not urlsafe, we need to include the padding characters
dArr[dLen - 2] = '=';
}
if (!urlsafe) { // include padding
dArr[dLen - 1] = '=';
}
}
return dArr;
}
/*
* Decodes a BASE64 encoded char array. All illegal characters will be ignored and can handle both arrays with
* and without line separators.
*
* @param sArr The source array. null or length 0 will return an empty array.
* @return The decoded array of bytes. May be of length 0. Will be null if the legal characters
* (including '=') isn't divideable by 4. (I.e. definitely corrupted).
*
public final byte[] decode(char[] sArr) {
// Check special case
int sLen = sArr != null ? sArr.length : 0;
if (sLen == 0) {
return new byte[0];
}
// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
// so we don't have to reallocate & copy it later.
int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
for (int i = 0; i < sLen; i++) { // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
if (IALPHABET[sArr[i]] < 0) {
sepCnt++;
}
}
// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
if ((sLen - sepCnt) % 4 != 0) {
return null;
}
int pad = 0;
for (int i = sLen; i > 1 && IALPHABET[sArr[--i]] <= 0; ) {
if (sArr[i] == '=') {
pad++;
}
}
int len = ((sLen - sepCnt) * 6 >> 3) - pad;
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
for (int s = 0, d = 0; d < len; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = 0;
for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
int c = IALPHABET[sArr[s++]];
if (c >= 0) {
i |= c << (18 - j * 6);
} else {
j--;
}
}
// Add the bytes
dArr[d++] = (byte) (i >> 16);
if (d < len) {
dArr[d++] = (byte) (i >> 8);
if (d < len) {
dArr[d++] = (byte) i;
}
}
}
return dArr;
}
*/
private int ctoi(char c) {
int i = c > IALPHABET_MAX_INDEX ? -1 : IALPHABET[c];
if (i < 0) {
String msg = "Illegal " + getName() + " character: '" + c + "'";
throw new DecodingException(msg);
}
return i;
}
/**
* Decodes a BASE64 encoded char array that is known to be reasonably well formatted. The preconditions are:
* + The array must have a line length of 76 chars OR no line separators at all (one line).
* + Line separator must be "\r\n", as specified in RFC 2045
* + The array must not contain illegal characters within the encoded string
* + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.
*
* @param sArr The source array. Length 0 will return an empty array. null will throw an exception.
* @return The decoded array of bytes. May be of length 0.
* @throws DecodingException on illegal input
*/
final byte[] decodeFast(char[] sArr) throws DecodingException {
// Check special case
int sLen = sArr != null ? sArr.length : 0;
if (sLen == 0) {
return new byte[0];
}
int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
// Trim illegal chars from start
while (sIx < eIx && IALPHABET[sArr[sIx]] < 0) {
sIx++;
}
// Trim illegal chars from end
while (eIx > 0 && IALPHABET[sArr[eIx]] < 0) {
eIx--;
}
// get the padding count (=) (0, 1 or 2)
int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0; // Count '=' at end.
int cCnt = eIx - sIx + 1; // Content count including possible separators
int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
// Decode all but the last 0 - 2 bytes.
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = ctoi(sArr[sIx++]) << 18 | ctoi(sArr[sIx++]) << 12 | ctoi(sArr[sIx++]) << 6 | ctoi(sArr[sIx++]);
// Add the bytes
dArr[d++] = (byte) (i >> 16);
dArr[d++] = (byte) (i >> 8);
dArr[d++] = (byte) i;
// If line separator, jump over it.
if (sepCnt > 0 && ++cc == 19) {
sIx += 2;
cc = 0;
}
}
if (d < len) {
// Decode last 1-3 bytes (incl '=') into 1-3 bytes
int i = 0;
for (int j = 0; sIx <= eIx - pad; j++) {
i |= ctoi(sArr[sIx++]) << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8) {
dArr[d++] = (byte) (i >> r);
}
}
return dArr;
}
// ****************************************************************************************
// * byte[] version
// ****************************************************************************************
/*
* Encodes a raw byte array into a BASE64 byte[] representation i accordance with RFC 2045.
*
* @param sArr The bytes to convert. If null or length 0 an empty array will be returned.
* @param lineSep Optional "\r\n" after 76 characters, unless end of file.
* No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
* little faster.
* @return A BASE64 encoded array. Never null.
*
public final byte[] encodeToByte(byte[] sArr, boolean lineSep) {
return encodeToByte(sArr, 0, sArr != null ? sArr.length : 0, lineSep);
}
/**
* Encodes a raw byte array into a BASE64 byte[] representation i accordance with RFC 2045.
*
* @param sArr The bytes to convert. If null an empty array will be returned.
* @param sOff The starting position in the bytes to convert.
* @param sLen The number of bytes to convert. If 0 an empty array will be returned.
* @param lineSep Optional "\r\n" after 76 characters, unless end of file.
* No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
* little faster.
* @return A BASE64 encoded array. Never null.
*
public final byte[] encodeToByte(byte[] sArr, int sOff, int sLen, boolean lineSep) {
// Check special case
if (sArr == null || sLen == 0) {
return new byte[0];
}
int eLen = (sLen / 3) * 3; // Length of even 24-bits.
int cCnt = ((sLen - 1) / 3 + 1) << 2; // Returned character count
int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
byte[] dArr = new byte[dLen];
// Encode even 24-bits
for (int s = sOff, d = 0, cc = 0; s < sOff + eLen; ) {
// Copy next three bytes into lower 24 bits of int, paying attension to sign.
int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
// Encode the int into four chars
dArr[d++] = (byte) ALPHABET[(i >>> 18) & 0x3f];
dArr[d++] = (byte) ALPHABET[(i >>> 12) & 0x3f];
dArr[d++] = (byte) ALPHABET[(i >>> 6) & 0x3f];
dArr[d++] = (byte) ALPHABET[i & 0x3f];
// Add optional line separator
if (lineSep && ++cc == 19 && d < dLen - 2) {
dArr[d++] = '\r';
dArr[d++] = '\n';
cc = 0;
}
}
// Pad and encode last bits if source isn't an even 24 bits.
int left = sLen - eLen; // 0 - 2.
if (left > 0) {
// Prepare the int
int i = ((sArr[sOff + eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sOff + sLen - 1] & 0xff) << 2) : 0);
// Set last four chars
dArr[dLen - 4] = (byte) ALPHABET[i >> 12];
dArr[dLen - 3] = (byte) ALPHABET[(i >>> 6) & 0x3f];
dArr[dLen - 2] = left == 2 ? (byte) ALPHABET[i & 0x3f] : (byte) '=';
dArr[dLen - 1] = '=';
}
return dArr;
}
/**
* Decodes a BASE64 encoded byte array. All illegal characters will be ignored and can handle both arrays with
* and without line separators.
*
* @param sArr The source array. Length 0 will return an empty array. null will throw an exception.
* @return The decoded array of bytes. May be of length 0. Will be null if the legal characters
* (including '=') isn't divideable by 4. (I.e. definitely corrupted).
*
public final byte[] decode(byte[] sArr) {
return decode(sArr, 0, sArr.length);
}
/**
* Decodes a BASE64 encoded byte array. All illegal characters will be ignored and can handle both arrays with
* and without line separators.
*
* @param sArr The source array. null will throw an exception.
* @param sOff The starting position in the source array.
* @param sLen The number of bytes to decode from the source array. Length 0 will return an empty array.
* @return The decoded array of bytes. May be of length 0. Will be null if the legal characters
* (including '=') isn't divideable by 4. (I.e. definitely corrupted).
*
public final byte[] decode(byte[] sArr, int sOff, int sLen) {
// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
// so we don't have to reallocate & copy it later.
int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
for (int i = 0; i < sLen; i++) { // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
if (IALPHABET[sArr[sOff + i] & 0xff] < 0) {
sepCnt++;
}
}
// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
if ((sLen - sepCnt) % 4 != 0) {
return null;
}
int pad = 0;
for (int i = sLen; i > 1 && IALPHABET[sArr[sOff + --i] & 0xff] <= 0; ) {
if (sArr[sOff + i] == '=') {
pad++;
}
}
int len = ((sLen - sepCnt) * 6 >> 3) - pad;
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
for (int s = 0, d = 0; d < len; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = 0;
for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
int c = IALPHABET[sArr[sOff + s++] & 0xff];
if (c >= 0) {
i |= c << (18 - j * 6);
} else {
j--;
}
}
// Add the bytes
dArr[d++] = (byte) (i >> 16);
if (d < len) {
dArr[d++] = (byte) (i >> 8);
if (d < len) {
dArr[d++] = (byte) i;
}
}
}
return dArr;
}
/*
* Decodes a BASE64 encoded byte array that is known to be resonably well formatted. The method is about twice as
* fast as {@link #decode(byte[])}. The preconditions are:
* + The array must have a line length of 76 chars OR no line separators at all (one line).
* + Line separator must be "\r\n", as specified in RFC 2045
* + The array must not contain illegal characters within the encoded string
* + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.
*
* @param sArr The source array. Length 0 will return an empty array. null will throw an exception.
* @return The decoded array of bytes. May be of length 0.
*
public final byte[] decodeFast(byte[] sArr) {
// Check special case
int sLen = sArr.length;
if (sLen == 0) {
return new byte[0];
}
int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
// Trim illegal chars from start
while (sIx < eIx && IALPHABET[sArr[sIx] & 0xff] < 0) {
sIx++;
}
// Trim illegal chars from end
while (eIx > 0 && IALPHABET[sArr[eIx] & 0xff] < 0) {
eIx--;
}
// get the padding count (=) (0, 1 or 2)
int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0; // Count '=' at end.
int cCnt = eIx - sIx + 1; // Content count including possible separators
int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
// Decode all but the last 0 - 2 bytes.
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = IALPHABET[sArr[sIx++]] << 18 | IALPHABET[sArr[sIx++]] << 12 | IALPHABET[sArr[sIx++]] << 6 | IALPHABET[sArr[sIx++]];
// Add the bytes
dArr[d++] = (byte) (i >> 16);
dArr[d++] = (byte) (i >> 8);
dArr[d++] = (byte) i;
// If line separator, jump over it.
if (sepCnt > 0 && ++cc == 19) {
sIx += 2;
cc = 0;
}
}
if (d < len) {
// Decode last 1-3 bytes (incl '=') into 1-3 bytes
int i = 0;
for (int j = 0; sIx <= eIx - pad; j++) {
i |= IALPHABET[sArr[sIx++]] << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8) {
dArr[d++] = (byte) (i >> r);
}
}
return dArr;
}
*/
// ****************************************************************************************
// * String version
// ****************************************************************************************
/**
* Encodes a raw byte array into a BASE64 String representation i accordance with RFC 2045.
*
* @param sArr The bytes to convert. If null or length 0 an empty array will be returned.
* @param lineSep Optional "\r\n" after 76 characters, unless end of file.
* No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
* little faster.
* @return A BASE64 encoded array. Never null.
*/
final String encodeToString(byte[] sArr, boolean lineSep) {
// Reuse char[] since we can't create a String incrementally anyway and StringBuffer/Builder would be slower.
return new String(encodeToChar(sArr, lineSep));
}
/*
* Decodes a BASE64 encoded String. All illegal characters will be ignored and can handle both strings with
* and without line separators.
* Note! It can be up to about 2x the speed to call decode(str.toCharArray()) instead. That
* will create a temporary array though. This version will use str.charAt(i) to iterate the string.
*
* @param str The source string. null or length 0 will return an empty array.
* @return The decoded array of bytes. May be of length 0. Will be null if the legal characters
* (including '=') isn't divideable by 4. (I.e. definitely corrupted).
*
public final byte[] decode(String str) {
// Check special case
int sLen = str != null ? str.length() : 0;
if (sLen == 0) {
return new byte[0];
}
// Count illegal characters (including '\r', '\n') to know what size the returned array will be,
// so we don't have to reallocate & copy it later.
int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
for (int i = 0; i < sLen; i++) { // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
if (IALPHABET[str.charAt(i)] < 0) {
sepCnt++;
}
}
// Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
if ((sLen - sepCnt) % 4 != 0) {
return null;
}
// Count '=' at end
int pad = 0;
for (int i = sLen; i > 1 && IALPHABET[str.charAt(--i)] <= 0; ) {
if (str.charAt(i) == '=') {
pad++;
}
}
int len = ((sLen - sepCnt) * 6 >> 3) - pad;
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
for (int s = 0, d = 0; d < len; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = 0;
for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
int c = IALPHABET[str.charAt(s++)];
if (c >= 0) {
i |= c << (18 - j * 6);
} else {
j--;
}
}
// Add the bytes
dArr[d++] = (byte) (i >> 16);
if (d < len) {
dArr[d++] = (byte) (i >> 8);
if (d < len) {
dArr[d++] = (byte) i;
}
}
}
return dArr;
}
/**
* Decodes a BASE64 encoded string that is known to be resonably well formatted. The method is about twice as
* fast as {@link #decode(String)}. The preconditions are:
* + The array must have a line length of 76 chars OR no line separators at all (one line).
* + Line separator must be "\r\n", as specified in RFC 2045
* + The array must not contain illegal characters within the encoded string
* + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.
*
* @param s The source string. Length 0 will return an empty array. null will throw an exception.
* @return The decoded array of bytes. May be of length 0.
*
public final byte[] decodeFast(String s) {
// Check special case
int sLen = s.length();
if (sLen == 0) {
return new byte[0];
}
int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
// Trim illegal chars from start
while (sIx < eIx && IALPHABET[s.charAt(sIx) & 0xff] < 0) {
sIx++;
}
// Trim illegal chars from end
while (eIx > 0 && IALPHABET[s.charAt(eIx) & 0xff] < 0) {
eIx--;
}
// get the padding count (=) (0, 1 or 2)
int pad = s.charAt(eIx) == '=' ? (s.charAt(eIx - 1) == '=' ? 2 : 1) : 0; // Count '=' at end.
int cCnt = eIx - sIx + 1; // Content count including possible separators
int sepCnt = sLen > 76 ? (s.charAt(76) == '\r' ? cCnt / 78 : 0) << 1 : 0;
int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
// Decode all but the last 0 - 2 bytes.
int d = 0;
for (int cc = 0, eLen = (len / 3) * 3; d < eLen; ) {
// Assemble three bytes into an int from four "valid" characters.
int i = IALPHABET[s.charAt(sIx++)] << 18 | IALPHABET[s.charAt(sIx++)] << 12 | IALPHABET[s.charAt(sIx++)] << 6 | IALPHABET[s.charAt(sIx++)];
// Add the bytes
dArr[d++] = (byte) (i >> 16);
dArr[d++] = (byte) (i >> 8);
dArr[d++] = (byte) i;
// If line separator, jump over it.
if (sepCnt > 0 && ++cc == 19) {
sIx += 2;
cc = 0;
}
}
if (d < len) {
// Decode last 1-3 bytes (incl '=') into 1-3 bytes
int i = 0;
for (int j = 0; sIx <= eIx - pad; j++) {
i |= IALPHABET[s.charAt(sIx++)] << (18 - j * 6);
}
for (int r = 16; d < len; r -= 8) {
dArr[d++] = (byte) (i >> r);
}
}
return dArr;
}
*/
}