Tileson 1.4.0
A helpful json parser for Tiled maps
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Base64.hpp
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1//
2// Created by robin on 22.03.2020.
3// Based on: https://github.com/ReneNyffenegger/cpp-base64
4//
5
6#ifndef TILESON_BASE64_HPP
7#define TILESON_BASE64_HPP
8#include <string>
9#include <iostream>
10
11namespace tson
12{
13 class Base64
14 {
15 public:
16 inline static std::string Encode(unsigned char const *, unsigned int len);
17
18 inline static std::string Decode(std::string const &s);
19
20 };
21
22 static const std::string base64_chars =
23 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
24 "abcdefghijklmnopqrstuvwxyz"
25 "0123456789+/";
26
27 static inline bool is_base64(unsigned char c)
28 {
29 return (isalnum(c) || (c == '+') || (c == '/'));
30 }
31}
32
33std::string tson::Base64::Encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
34 std::string ret;
35 int i = 0;
36 int j = 0;
37 unsigned char char_array_3[3];
38 unsigned char char_array_4[4];
39
40 while (in_len--) {
41 char_array_3[i++] = *(bytes_to_encode++);
42 if (i == 3) {
43 char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
44 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
45 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
46 char_array_4[3] = char_array_3[2] & 0x3f;
47
48 for(i = 0; (i <4) ; i++)
49 ret += base64_chars[char_array_4[i]];
50 i = 0;
51 }
52 }
53
54 if (i)
55 {
56 for(j = i; j < 3; j++)
57 char_array_3[j] = '\0';
58
59 char_array_4[0] = ( char_array_3[0] & 0xfc) >> 2;
60 char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
61 char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
62
63 for (j = 0; (j < i + 1); j++)
64 ret += base64_chars[char_array_4[j]];
65
66 while((i++ < 3))
67 ret += '=';
68
69 }
70
71 return ret;
72
73}
74
75std::string tson::Base64::Decode(std::string const& encoded_string) {
76 size_t in_len = encoded_string.size();
77 int i = 0;
78 int j = 0;
79 int in_ = 0;
80 unsigned char char_array_4[4], char_array_3[3];
81 std::string ret;
82
83 while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
84 char_array_4[i++] = encoded_string[in_]; in_++;
85 if (i ==4) {
86 for (i = 0; i <4; i++)
87 char_array_4[i] = base64_chars.find(char_array_4[i]) & 0xff;
88
89 char_array_3[0] = ( char_array_4[0] << 2 ) + ((char_array_4[1] & 0x30) >> 4);
90 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
91 char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
92
93 for (i = 0; (i < 3); i++)
94 ret += char_array_3[i];
95 i = 0;
96 }
97 }
98
99 if (i) {
100 for (j = 0; j < i; j++)
101 char_array_4[j] = base64_chars.find(char_array_4[j]) & 0xff;
102
103 char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
104 char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
105
106 for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
107 }
108
109 return ret;
110}
111
112#endif //TILESON_BASE64_HPP
Definition Base64.hpp:14
static std::string Encode(unsigned char const *, unsigned int len)
Definition Base64.hpp:33
static std::string Decode(std::string const &s)
Definition Base64.hpp:75
Definition Base64.hpp:12