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#ifndef BASE64_CONVERTER
#define BASE64_CONVERTER
#include <iostream>
#include <string>
#include <vector>
using std::string;
using std::vector;
typedef unsigned char UC;
typedef unsigned int UI;
#define EXTRA '^'
#define MASK1 0xfc
#define MASK2 0x03
#define MASK3 0xf0
#define MASK4 0x0f
#define MASK5 0xc0
#define MASK6 0x3f
#define MASK7 0x30
#define MASK8 0x3c
const string characterMap = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
inline string Base64Encode(UC const* buffer, size_t& size)
{
string encoded = "";
UI i = 0,
j = 0,
k = 0;
UC temp_a_3[3],
temp_4[4];
for (i = 0; i < size; i += 3) {
for (j = i, k = 0; j < size && j < i + 3; j++)
temp_a_3[k++] = *(buffer++);
for (; k < 3; k++)
temp_a_3[k] = '\0';
temp_4[0] = (temp_a_3[0] & MASK1) >> 2;
temp_4[1] = ((temp_a_3[0] & MASK2) << 4) + ((temp_a_3[1] & MASK3) >> 4);
temp_4[2] = ((temp_a_3[1] & MASK4) << 2) + ((temp_a_3[2] & MASK5) >> 6);
temp_4[3] = temp_a_3[2] & MASK6;
for (j = i, k = 0; j < size + 1 && j < i + 4; j++, k++)
encoded += characterMap[temp_4[k]];
for (; k < 4; k++)
encoded += EXTRA;
}
return encoded;
}
inline vector<UC> Base64Decoder(string const& encoded)
{
UI i = 0,
j = 0,
k = 0,
in_len = encoded.size();
UC temp_a_3[3],
temp_4[4];
vector<UC> decoded;
for (i = 0; i < in_len; i += 4) {
for (j = i, k = 0; j < i + 4 && encoded[j] != EXTRA; j++)
temp_4[k++] = characterMap.find(encoded[j]);
for (; k < 4; k++)
temp_4[k++] = '\0';
temp_a_3[0] = (temp_4[0] << 2) + ((temp_4[1] & MASK7) >> 4);
temp_a_3[1] = ((temp_4[1] & MASK4) << 4) + ((temp_4[2] & MASK8) >> 2);
temp_a_3[2] = ((temp_4[2] & MASK2) << 6) + temp_4[3];
for (j = i, k = 0; k < 3 && encoded[j + 1] != EXTRA; j++, k++)
decoded.push_back(temp_a_3[k]);
}
return decoded;
}
#endif
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