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- static inline bool is_base64(unsigned char c) {
- return (isalnum(c) || (c == '+') || (c == '/'));
- }
- String base64_decode(String const& encoded_string) {
- int in_len = encoded_string.length();
- int i = 0;
- int j = 0;
- int in_ = 0;
- unsigned char char_array_4[4], char_array_3[3];
- String 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 = (char)base64_chars.indexOf(char_array_4);
- 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 += (char)char_array_3;
- i = 0;
- }
- }
- if (i) {
- for (j = 0; j < i; j++)
- char_array_4[j] = (char)base64_chars.indexOf(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);
- for (j = 0; (j < i - 1); j++) ret += (char)char_array_3[j];
- }
- return ret;
- }
- Usage :
- String Stringcontent = "base64encodedcontent"; // Feed the encoded base64 content here
- base64_decode(Stringcontent.c_str())
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