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#ifndef BASE64_h___
#define BASE64_h___
#include <string>
static const char* B64chars
= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const int B64index[256] =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 63, 62, 62, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0,
0, 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, 0, 0, 0, 0, 63,
0, 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
};
const std::string b64encode(const void* data, const size_t &len)
{
if (len == 0) return "";
std::string result((len + 2) / 3 * 4, '=');
char *p = (char*) data, *str = &result[0];
size_t j = 0, pad = len % 3;
const size_t last = len - pad;
for (size_t i = 0; i < last; i += 3)
{
int n = int(p[i]) << 16 | int(p[i + 1]) << 8 | p[i + 2];
str[j++] = B64chars[n >> 18];
str[j++] = B64chars[n >> 12 & 0x3F];
str[j++] = B64chars[n >> 6 & 0x3F];
str[j++] = B64chars[n & 0x3F];
}
if (pad) /// set padding
{
int n = int(p[last]) << 8 | (--pad ? p[last + 1] : 0);
str[j++] = B64chars[n >> 10];
str[j++] = B64chars[n >> 4 & 0x03F];
str[j++] = pad ? B64chars[n << 2 & 0x3F] : '=';
}
return result;
}
const std::string b64decode(const void* data, const size_t &len)
{
if (len == 0) return "";
unsigned char *p = (unsigned char*) data;
size_t j = 0,
pad1 = len % 4 || p[len - 1] == '=',
pad2 = pad1 && (len % 4 > 2 || p[len - 2] != '=');
const size_t last = (len - pad1) / 4 << 2;
std::string result(last / 4 * 3 + pad1 + pad2, '\0');
unsigned char *str = (unsigned char*) &result[0];
for (size_t i = 0; i < last; i += 4)
{
int n = B64index[p[i]] << 18 | B64index[p[i+1]] << 12 | B64index[p[i+2]] << 6 | B64index[p[i+3]];
str[j++] = n >> 16;
str[j++] = n >> 8;
str[j++] = n;
}
if (pad1)
{
int n = B64index[p[last]] << 18 | B64index[p[last + 1]] << 12;
str[j++] = n >> 16;
if (pad2)
{
str[j] = n >> 8 | B64index[p[last + 2]] >> 2;
}
}
return result;
}
std::string b64encode(const std::string& str)
{
return b64encode(str.c_str(), str.size());
}
std::string b64decode(const std::string& str64)
{
return b64decode(str64.c_str(), str64.size());
}
#endif // BASE64_h___
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