140 lines
5.3 KiB
C++
140 lines
5.3 KiB
C++
#ifndef _MACARON_BASE64_H_
|
|
#define _MACARON_BASE64_H_
|
|
|
|
/**
|
|
* The MIT License (MIT)
|
|
* Copyright (c) 2016 tomykaira
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
namespace macaron::Base64 {
|
|
static std::string Encode(const char *data, const size_t &len) {
|
|
static constexpr char sEncodingTable[] = {
|
|
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
|
|
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
|
|
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
|
|
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
|
|
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};
|
|
|
|
size_t in_len = len;
|
|
std::string ret;
|
|
if (in_len > 0) {
|
|
size_t out_len = 4 * ((in_len + 2) / 3);
|
|
ret = std::string(out_len, '\0');
|
|
size_t i;
|
|
char *p = const_cast<char *>(ret.c_str());
|
|
|
|
for (i = 0; i < in_len - 2; i += 3) {
|
|
*p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
|
|
*p++ = sEncodingTable[((data[i] & 0x3) << 4) |
|
|
((int)(data[i + 1] & 0xF0) >> 4)];
|
|
*p++ = sEncodingTable[((data[i + 1] & 0xF) << 2) |
|
|
((int)(data[i + 2] & 0xC0) >> 6)];
|
|
*p++ = sEncodingTable[data[i + 2] & 0x3F];
|
|
}
|
|
if (i < in_len) {
|
|
*p++ = sEncodingTable[(data[i] >> 2) & 0x3F];
|
|
if (i == (in_len - 1)) {
|
|
*p++ = sEncodingTable[((data[i] & 0x3) << 4)];
|
|
*p++ = '=';
|
|
} else {
|
|
*p++ = sEncodingTable[((data[i] & 0x3) << 4) |
|
|
((int)(data[i + 1] & 0xF0) >> 4)];
|
|
*p++ = sEncodingTable[((data[i + 1] & 0xF) << 2)];
|
|
}
|
|
*p++ = '=';
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
[[maybe_unused]] static std::string Encode(const std::string &data) {
|
|
return Encode(&data[0], data.size());
|
|
}
|
|
|
|
[[maybe_unused]] static std::vector<char> Decode(const std::string &input) {
|
|
static constexpr unsigned char kDecodingTable[] = {
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63, 52, 53, 54, 55, 56, 57,
|
|
58, 59, 60, 61, 64, 64, 64, 64, 64, 64, 64, 0, 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, 64, 64, 64, 64, 64, 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
|
|
37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
|
|
64, 64, 64, 64};
|
|
|
|
std::vector<char> out;
|
|
if (not input.empty()) {
|
|
size_t in_len = input.size();
|
|
if (in_len % 4 != 0)
|
|
throw std::runtime_error("Input data size is not a multiple of 4");
|
|
|
|
size_t out_len = in_len / 4 * 3;
|
|
if (input[in_len - 1] == '=')
|
|
out_len--;
|
|
if (input[in_len - 2] == '=')
|
|
out_len--;
|
|
|
|
out.resize(out_len);
|
|
|
|
for (size_t i = 0, j = 0; i < in_len;) {
|
|
uint32_t a = input[i] == '='
|
|
? 0 & i++
|
|
: kDecodingTable[static_cast<int>(input[i++])];
|
|
uint32_t b = input[i] == '='
|
|
? 0 & i++
|
|
: kDecodingTable[static_cast<int>(input[i++])];
|
|
uint32_t c = input[i] == '='
|
|
? 0 & i++
|
|
: kDecodingTable[static_cast<int>(input[i++])];
|
|
uint32_t d = input[i] == '='
|
|
? 0 & i++
|
|
: kDecodingTable[static_cast<int>(input[i++])];
|
|
|
|
uint32_t triple =
|
|
(a << 3 * 6) + (b << 2 * 6) + (c << 1 * 6) + (d << 0 * 6);
|
|
|
|
if (j < out_len)
|
|
out[j++] = (triple >> 2 * 8) & 0xFF;
|
|
if (j < out_len)
|
|
out[j++] = (triple >> 1 * 8) & 0xFF;
|
|
if (j < out_len)
|
|
out[j++] = (triple >> 0 * 8) & 0xFF;
|
|
}
|
|
}
|
|
|
|
return out;
|
|
}
|
|
} // namespace macaron::Base64
|
|
|
|
#endif /* _MACARON_BASE64_H_ */
|