Function base64_decode_string

src/auth.cpp:717–760

}

static char* base64_decode_string(const char* buf, unsigned int len, int* newlen)
{
    unsigned long i;
    int j, x1, x2, x3, x4;
    char *out;
    out = (char *)malloc( ( len * 3/4 ) + 8 );
    for(i=0, j=0; i + 3 < len; i += 4) {
        x1=base64_val(buf[i]);
        x2=base64_val(buf[i+1]);
        x3=base64_val(buf[i+2]);
        x4=base64_val(buf[i+3]);
        out[j++]=(x1<<2) | ((x2 & 0x30)>>4);
        out[j++]=((x2 & 0x0F)<<4) | ((x3 & 0x3C)>>2);
        out[j++]=((x3 & 0x03)<<6) | (x4 & 0x3F);
    }
    if (i<len) {
        x1 = base64_val(buf[i]);
        if (i+1<len)
            x2=base64_val(buf[i+1]);
        else
            x2=-1;
        if (i+2<len)
            x3=base64_val(buf[i+2]);
        else
            x3=-1;
        if(i+3<len)
            x4=base64_val(buf[i+3]);
        else x4=-1;
        if (x2!=-1) {
            out[j++]=(x1<<2) | ((x2 & 0x30)>>4);
            if (x3==-1) {
                out[j++]=((x2 & 0x0F)<<4) | ((x3 & 0x3C)>>2);
                if (x4==-1) {
                    out[j++]=((x3 & 0x03)<<6) | (x4 & 0x3F);
                }
            }
        }

    }

    out[j++] = 0;
    *newlen=j;
    return out;
}

char base64[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";