base16 編碼 和 解碼

/**
 * Tencent is pleased to support the open source community by making Tars available.
 *
 * Copyright (C) 2016THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except 
 * in compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * 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.
 */

 

解碼的代碼，參考了騰訊開源框架tars工程的 tc_cgi.cpp 代碼 

 

 1 #include <iostream>
 2 
 3 using namespace std;
 4 
 5 
 6 //16進制轉爲char 
 7 char x2c(const string& sWhat)
 8 {
 9     register char digit;
10 
11     if (sWhat.length() < 2)
12     {
13         return '\0';
14     }
15 
16     digit = (sWhat[0] >= 'A' ? ((sWhat[0] & 0xdf) - 'A') + 10 : (sWhat[0] - '0'));
17     digit *= 16;
18     digit += (sWhat[1] >= 'A' ? ((sWhat[1] & 0xdf) - 'A') + 10 : (sWhat[1] - '0'));
19 
20     return (digit);
21 }
22 
23 
24 
25 string Base16Decode(const string& sUrl)
26 {
27     string sDecodeUrl;
28     register string::size_type pos = 0;
29     string::size_type len = sUrl.length();
30 
31     sDecodeUrl = "";
32 
33     while (pos < len)
34     {
35         if (sUrl[pos] == '+')
36         {
37             sDecodeUrl += ' ';
38             ++pos;
39         }
40         else if (sUrl[pos] == '%')
41         {
42             sDecodeUrl += x2c(sUrl.substr(pos + 1));
43             pos += 3;
44         }
45         else
46         {
47             sDecodeUrl += sUrl[pos];
48 
49             ++pos;
50         }
51     }
52 
53     return sDecodeUrl;
54 }
55 
56 string Base16Encode(const string& sUrl)
57 {
58     static char HEX_TABLE[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
59 
60     string result;
61     for (size_t i = 0; i < sUrl.length(); i++)
62     {
63         char c = sUrl[i];
64         if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
65             result.append(1, c);
66         else
67         {
68             result.append(1, '%');
69             result.append(1, HEX_TABLE[(c >> 4) & 0x0f]);
70             result.append(1, HEX_TABLE[c & 0x0f]);
71         }
72     }
73 
74     return result;
75 }
76 
77 int main() {
78     string str1 = "HenryAbc123";
79     string str2 = "何亮到此一遊abcde123";
80 
81     string out1 = Base16Encode(str1);
82     string out2 = Base16Encode(str2);
83     cout << "=====================begin encode:" << endl;
84     cout << "out1:"<<out1 << endl;
85     cout << "out2:"<<out2 << endl;
86     cout << "=====================begin decode:" << endl;
87     
88     string decodeStr1 = Base16Decode(out1);
89     string decodeStr2 = Base16Decode(out2);
90     cout << "decodeStr1:" << decodeStr1 << endl;
91     cout << "decodeStr2:" << decodeStr2 << endl;
92 
93 
94     cout << "Base 16 test end!" << endl;
95     return 0;
96 }

 

=======屏==幕==輸==出========= output:

=====================begin encode:
out1:HenryAbc123
out2:%BA%CE%C1%C1%B5%BD%B4%CB%D2%BB%D3%CEabcde123
=====================begin decode:
decodeStr1:HenryAbc123
decodeStr2:何亮到此一遊abcde123
Base 16 test end!