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#ifndef BASE64_CONVERTER_HPP
#define BASE64_CONVERTER_HPP
#include <iostream>
#include <vector>
static const char characterMap[] = { '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 std::vector<int> base64InverseMap = [] {
std::vector<int> map(256, -1);
for (int i = 0; i < 64; ++i) {
map[characterMap[i]] = i;
}
return map;
}();
inline bool is_base64(unsigned char c) {
return (isalnum(c) || (c == '+') || (c == '/'));
}
inline std::string Base64Encode(const unsigned char* buffer, size_t size) {
std::string ret;
int i = 0;
int j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
while (size--) {
char_array_3[i++] = *(buffer++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (i = 0; (i < 4); i++)
ret += characterMap[char_array_4[i]];
i = 0;
}
}
if (i) {
for (j = i; j < 3; j++)
char_array_3[j] = '\0';
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; (j < i + 1); j++)
ret += characterMap[char_array_4[j]];
while ((i++ < 3))
ret += '=';
}
return ret;
}
inline char* Base64Encode(char* buffer, size_t& size)
{
std::string encodedString = Base64Encode(reinterpret_cast<const unsigned char*>(buffer), size);
size = encodedString.size(); // Update size to the new encoded string size
char* encodedBuffer = new char[size + 1];
std::copy(encodedString.begin(), encodedString.end(), encodedBuffer);
encodedBuffer[size] = '\0'; // Null-terminate the string
return encodedBuffer;
}
inline std::vector<unsigned char> Base64Decode(const std::string& encoded_string) {
int in_len = encoded_string.size();
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4], char_array_3[3];
std::vector<unsigned char> ret;
while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
char_array_4[i++] = encoded_string[in_]; in_++;
if (i == 4) {
for (i = 0; i < 4; i++)
char_array_4[i] = base64InverseMap[char_array_4[i]];
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; (i < 3); i++)
ret.push_back(char_array_3[i]);
i = 0;
}
}
if (i) {
for (j = i; j < 4; j++)
char_array_4[j] = 0;
for (j = 0; j < 4; j++)
char_array_4[j] = base64InverseMap[char_array_4[j]];
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; (j < i - 1); j++) ret.push_back(char_array_3[j]);
}
return ret;
}
inline char* Base64Decode(char* buffer, size_t& size) {
std::string encodedString(buffer);
std::vector<unsigned char> decodedData = Base64Decode(encodedString);
size = decodedData.size();
char* decodedBuffer = new char[size];
std::copy(decodedData.begin(), decodedData.end(), decodedBuffer);
return decodedBuffer;
}
#endif
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