ceph/src/jaegertracing/thrift/lib/csharp/src/Protocol/TBase64Utils.cs

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements. See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership. The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License. You may obtain a copy of the License at
   9  *
  10  *   http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing,
  13  * software distributed under the License is distributed on an
  14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  15  * KIND, either express or implied. See the License for the
  16  * specific language governing permissions and limitations
  17  * under the License.
  18  */
  19
  20 using System;
  21
  22 namespace Thrift.Protocol
  23 {
  24     internal static class TBase64Utils
  25     {
  26         internal const string ENCODE_TABLE =
  27             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  28
  29         internal static void encode(byte[] src, int srcOff, int len, byte[] dst,
  30                                 int dstOff)
  31         {
  32             dst[dstOff] = (byte)ENCODE_TABLE[(src[srcOff] >> 2) & 0x3F];
  33             if (len == 3)
  34             {
  35                 dst[dstOff + 1] =
  36                     (byte)ENCODE_TABLE[
  37                         ((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
  38                 dst[dstOff + 2] =
  39                     (byte)ENCODE_TABLE[
  40                         ((src[srcOff + 1] << 2) & 0x3C) | ((src[srcOff + 2] >> 6) & 0x03)];
  41                 dst[dstOff + 3] =
  42                     (byte)ENCODE_TABLE[src[srcOff + 2] & 0x3F];
  43             }
  44             else if (len == 2)
  45             {
  46                 dst[dstOff + 1] =
  47                     (byte)ENCODE_TABLE[
  48                         ((src[srcOff] << 4) & 0x30) | ((src[srcOff + 1] >> 4) & 0x0F)];
  49                 dst[dstOff + 2] =
  50                     (byte)ENCODE_TABLE[(src[srcOff + 1] << 2) & 0x3C];
  51
  52             }
  53             else
  54             { // len == 1) {
  55                 dst[dstOff + 1] =
  56                     (byte)ENCODE_TABLE[(src[srcOff] << 4) & 0x30];
  57             }
  58         }
  59
  60         private static int[] DECODE_TABLE = {
  61             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  62             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  63             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
  64             52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,
  65             -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
  66             15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
  67             -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
  68             41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
  69             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  70             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  71             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  72             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  73             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  74             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  75             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  76             -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
  77         };
  78
  79         internal static void decode(byte[] src, int srcOff, int len, byte[] dst,
  80                                  int dstOff)
  81         {
  82             dst[dstOff] = (byte)
  83                 ((DECODE_TABLE[src[srcOff] & 0x0FF] << 2) |
  84                 (DECODE_TABLE[src[srcOff + 1] & 0x0FF] >> 4));
  85             if (len > 2)
  86             {
  87                 dst[dstOff + 1] = (byte)
  88                     (((DECODE_TABLE[src[srcOff + 1] & 0x0FF] << 4) & 0xF0) |
  89                     (DECODE_TABLE[src[srcOff + 2] & 0x0FF] >> 2));
  90                 if (len > 3)
  91                 {
  92                     dst[dstOff + 2] = (byte)
  93                         (((DECODE_TABLE[src[srcOff + 2] & 0x0FF] << 6) & 0xC0) |
  94                         DECODE_TABLE[src[srcOff + 3] & 0x0FF]);
  95                 }
  96             }
  97         }
  98
  99     }
 100 }