96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
#ifndef _MACARON_BASE64_H_
|
|
#define _MACARON_BASE64_H_
|
|
|
|
#include <string>
|
|
|
|
static const 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', '+', '/'
|
|
};
|
|
|
|
static const 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
|
|
};
|
|
|
|
class Base64 {
|
|
public:
|
|
|
|
static std::string Encode(const std::string data) {
|
|
size_t in_len = data.size();
|
|
size_t out_len = 4 * ((in_len + 2) / 3);
|
|
std::string ret(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;
|
|
}
|
|
|
|
static std::string Decode(const std::string& input, std::string& out) {
|
|
size_t in_len = input.size();
|
|
if (in_len % 4 != 0) return "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 "";
|
|
}
|
|
|
|
};
|
|
|
|
#endif /* _MACARON_BASE64_H_ */ |