content: /*
   * 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 com.alibaba.nacos.client.identify;
  
  import java.io.UnsupportedEncodingException;
  
  /**
   * 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: 1080712 $
   * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
   * @since 1.0
   */
  public class Base64 {
  
      /**
       * 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;
  
      // 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, CHUNK_SEPARATOR, 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) {
          chunkSeparatorLength = lineSeparator == null ? 0 : lineSeparator.length;
          unencodedBlockSize = BYTES_PER_UNENCODED_BLOCK;
          encodedBlockSize = BYTES_PER_ENCODED_BLOCK;
          this.lineLength = (lineLength > 0 && chunkSeparatorLength > 0) ? (lineLength / encodedBlockSize)
              * encodedBlockSize : 0;
          // 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 = null;
                  try {
                      sep = new String(lineSeparator, "UTF-8");
                  } catch (UnsupportedEncodingException e) {
                  }
                  throw new IllegalArgumentException("lineSeparator must not contain base64 characters: [" + sep + "]");
              }
              if (lineLength > 0) {
                  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;
      }
  
      /**
       * <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;
          }
          if (inAvail < 0) {
              eof = true;
              if (0 == modulus && lineLength == 0) {
                  return;
              }
              ensureBufferSize(encodeSize);
              int savedPos = pos;
              switch (modulus) {
                  case 1:
                      buffer[pos++] = encodeTable[(bitWorkArea >> 2) & MASK_6BITS];
                      buffer[pos++] = encodeTable[(bitWorkArea << 4) & MASK_6BITS];
  
                      if (encodeTable == STANDARD_ENCODE_TABLE) {
                          buffer[pos++] = PAD;
                          buffer[pos++] = PAD;
                      }
                      break;
  
                  case 2:
                      buffer[pos++] = encodeTable[(bitWorkArea >> 10) & MASK_6BITS];
                      buffer[pos++] = encodeTable[(bitWorkArea >> 4) & MASK_6BITS];
                      buffer[pos++] = encodeTable[(bitWorkArea << 2) & MASK_6BITS];
  
                      if (encodeTable == STANDARD_ENCODE_TABLE) {
                          buffer[pos++] = PAD;
                      }
                      break;
                  default:
                      break;
              }
              currentLinePos += pos - savedPos;
              /**
               * 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;
                  if (0 == modulus) {
                      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:
                      bitWorkArea = bitWorkArea >> 4;
                      buffer[pos++] = (byte)((bitWorkArea) & MASK_8BITS);
                      break;
                  case 3:
                      bitWorkArea = bitWorkArea >> 2;
                      buffer[pos++] = (byte)((bitWorkArea >> 8) & MASK_8BITS);
                      buffer[pos++] = (byte)((bitWorkArea) & MASK_8BITS);
                      break;
                  default:
                      break;
              }
          }
      }
  
      /**
       * 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, false, 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(MIME_CHUNK_SIZE, CHUNK_SEPARATOR, 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 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);
      }
  
      /**
       * Returns whether or not the <code>octet</code> is in the Base32 alphabet.
       *
       * @param octet The value to test
       * @return <code>true</code> if the value is defined in the the Base32 alphabet <code>false</code> otherwise.
       */
      protected boolean isInAlphabet(byte octet) {
          return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;
      }
  
      /**
       * Below from base class
       */
  
      /**
       * 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>
       */
      private static final int MIME_CHUNK_SIZE = 76;
  
      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
       */
      private static final int MASK_8BITS = 0xff;
  
      /**
       * Byte used to pad output.
       */
      private static final byte PAD_DEFAULT = '=';
  
      private static final byte PAD = PAD_DEFAULT;
  
      /**
       * 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.
       */
      private final int lineLength;
  
      /**
       * Size of chunk separator. Not used unless {@link #lineLength} > 0.
       */
      private final int chunkSeparatorLength;
  
      /**
       * Buffer for streaming.
       */
      private byte[] buffer;
  
      /**
       * Position where next character should be written in the buffer.
       */
      private 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.
       */
      private 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).
       */
      private 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.
       */
      private int modulus;
  
      /**
       * Ensure that the buffer has room for <code>size</code> bytes
       *
       * @param size minimum spare space required
       */
      private void ensureBufferSize(int size) {
          if ((buffer == null) || (buffer.length < pos + size)) {
              if (buffer == null) {
                  buffer = new byte[DEFAULT_BUFFER_SIZE];
                  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;
              }
          }
      }
  
      /**
       * 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.
       */
      private int readResults(byte[] b, int bPos, int bAvail) {
          if (buffer != null) {
              int len = Math.min(pos - readPos, bAvail);
              System.arraycopy(buffer, readPos, b, bPos, len);
              readPos += len;
              if (readPos >= pos) {
                  buffer = null;
              }
              return len;
          }
          return eof ? -1 : 0;
      }
  
      /**
       * Resets this object to its initial newly constructed state.
       */
      private void reset() {
          buffer = null;
          pos = 0;
          readPos = 0;
          currentLinePos = 0;
          modulus = 0;
          eof = false;
      }
  
      /**
       * 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
       */
      private byte[] decode(byte[] pArray) {
          reset();
          if (pArray == null || pArray.length == 0) {
              return pArray;
          }
          decode(pArray, 0, pArray.length);
          decode(pArray, 0, -1);
          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
       */
      private byte[] encode(byte[] pArray) {
          reset();
          if (pArray == null || pArray.length == 0) {
              return pArray;
          }
          encode(pArray, 0, pArray.length);
          encode(pArray, 0, -1);
          byte[] buf = new byte[pos - readPos];
          readResults(buf, 0, buf.length);
          return buf;
      }
  
      /**
       * 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
       */
      private 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
       */
      private 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) {
              /**
               * Round up to nearest multiple
               */
              len += ((len + lineLength - 1) / lineLength) * chunkSeparatorLength;
          }
          return len;
      }
  }
  