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// Copyright (c) 2012-2017 VideoStitch SAS
// Copyright (c) 2018 stitchEm
// Public domain implementation from https://stackoverflow.com/a/13935718/463796
#include "base64.hpp"
#include <vector>
namespace VideoStitch {
namespace Util {
typedef unsigned char BYTE;
static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline bool is_base64(BYTE c) { return (isalnum(c) || (c == '+') || (c == '/')); }
std::string base64_encode(BYTE const* buf, size_t bufLen) {
std::string ret;
int i = 0;
int j = 0;
BYTE char_array_3[3];
BYTE char_array_4[4];
while (bufLen--) {
char_array_3[i++] = *(buf++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = (BYTE)((char_array_3[0] & 0x03) << 4) + (BYTE)((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = (BYTE)((char_array_3[1] & 0x0f) << 2) + (BYTE)((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (i = 0; (i < 4); i++) ret += base64_chars[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] = (BYTE)((char_array_3[0] & 0x03) << 4) + (BYTE)((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = (BYTE)((char_array_3[1] & 0x0f) << 2) + (BYTE)((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; (j < i + 1); j++) ret += base64_chars[char_array_4[j]];
while ((i++ < 3)) ret += '=';
}
return ret;
}
std::vector<BYTE> base64_decode(std::string const& encoded_string) {
auto in_len = encoded_string.size();
int i = 0;
int j = 0;
int in_ = 0;
BYTE char_array_4[4], char_array_3[3];
std::vector<BYTE> 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] = (BYTE)base64_chars.find(char_array_4[i]);
char_array_3[0] = (BYTE)(char_array_4[0] << 2) + (BYTE)((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = (BYTE)((char_array_4[1] & 0xf) << 4) + (BYTE)((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = (BYTE)((char_array_4[2] & 0x3) << 6) + (BYTE)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] = (BYTE)base64_chars.find(char_array_4[j]);
char_array_3[0] = (BYTE)(char_array_4[0] << 2) + (BYTE)((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = (BYTE)((char_array_4[1] & 0xf) << 4) + (BYTE)((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = (BYTE)((char_array_4[2] & 0x3) << 6) + (BYTE)char_array_4[3];
for (j = 0; (j < i - 1); j++) ret.push_back(char_array_3[j]);
}
return ret;
}
std::string base64Encode(const std::string& input) { return base64_encode((unsigned char*)input.data(), input.size()); }
std::string base64Decode(const std::string& str64) {
std::vector<BYTE> data = base64_decode(str64);
return std::string((char*)data.data(), data.size());
}
} // namespace Util
} // namespace VideoStitch