blob: ecf88d07ea548a560a8ae167d2d518f1a9ed4fe3 (
plain)
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
// Copyright (c) 2015-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <common/url.h>
#include <charconv>
#include <string>
#include <string_view>
#include <system_error>
std::string UrlDecode(std::string_view url_encoded)
{
std::string res;
res.reserve(url_encoded.size());
for (size_t i = 0; i < url_encoded.size(); ++i) {
char c = url_encoded[i];
// Special handling for percent which should be followed by two hex digits
// representing an octet values, see RFC 3986, Section 2.1 Percent-Encoding
if (c == '%' && i + 2 < url_encoded.size()) {
unsigned int decoded_value{0};
auto [p, ec] = std::from_chars(url_encoded.data() + i + 1, url_encoded.data() + i + 3, decoded_value, 16);
// Only if there is no error and the pointer is set to the end of
// the string, we can be sure both characters were valid hex
if (ec == std::errc{} && p == url_encoded.data() + i + 3) {
res += static_cast<char>(decoded_value);
// Next two characters are part of the percent encoding
i += 2;
continue;
}
// In case of invalid percent encoding, add the '%' and continue
}
res += c;
}
return res;
}
|