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epee::from_hex Struct Reference
#include <hex.h>
Static Public Member Functions | |
| static std::vector< uint8_t > | vector (boost::string_ref src) |
Detailed Description
Member Function Documentation
◆ vector()
|
static |
- Returns
- An std::vector of unsigned integers from the src
Definition at line 88 of file hex.cpp.
89 {
90 // should we include a specific character
91 auto include = [](char input) {
92 // we ignore spaces and colons
93 return !std::isspace(input) && input != ':';
94 };
95
96 // the number of relevant characters to decode
98
99 // this must be a multiple of two, otherwise we have a truncated input
100 if (count % 2) {
101 throw std::length_error{ "Invalid hexadecimal input length" };
102 }
103
104 std::vector<uint8_t> result;
105 result.reserve(count / 2);
106
107 // the data to work with (std::string is always null-terminated)
108 auto data = src.data();
109
110 // convert a single hex character to an unsigned integer
111 auto char_to_int = [](const char *input) {
112 switch (std::tolower(*input)) {
113 case '0': return 0;
114 case '1': return 1;
115 case '2': return 2;
116 case '3': return 3;
117 case '4': return 4;
118 case '5': return 5;
119 case '6': return 6;
120 case '7': return 7;
121 case '8': return 8;
122 case '9': return 9;
123 case 'a': return 10;
124 case 'b': return 11;
125 case 'c': return 12;
126 case 'd': return 13;
127 case 'e': return 14;
128 case 'f': return 15;
129 default: throw std::range_error{ "Invalid hexadecimal input" };
130 }
131 };
132
133 // keep going until we reach the end
134 while (data[0] != '\0') {
135 // skip unwanted characters
136 if (!include(data[0])) {
137 ++data;
138 continue;
139 }
140
141 // convert two matching characters to int
142 auto high = char_to_int(data++);
143 auto low = char_to_int(data++);
144
145 result.push_back(high << 4 | low);
146 }
147
148 return result;
149 }
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The documentation for this struct was generated from the following files:
