dojyorin / arduino_base64 Goto Github PK

void BASE64::decode(const char* input, uint8_t* output){
    size_t inputLength = strlen(input);
    uint8_t i = 0;
    uint8_t a3[3];
    uint8_t a4[4];

    while(inputLength--){
        if(*input == '='){
            break;
        }

        a4[i++] = *input++;

        if(i == 4){
            for(i = 0; i < 4; i++){
                a4[i] = charTable[a4[i]];
            }

            a4to3(a4, a3);

            for(i = 0; i < 3; i++){
                *output++ = a3[i];
            }

            i = 0;
        }
    }

    if(i){
        for(uint8_t j = i; j < 4; j++){
            a4[j] = '\0';
        }

        for(uint8_t j = 0; j < 4; j++){
            a4[j] = charTable[a4[j]];
        }

        a4to3(a4, a3);

        for(uint8_t j = 0; j < i - 1; j++){
            *output++ = a3[j];
        }
    }

    *output = 0;
}