Fix base64 encoding

Author: nikias

src/base64.c

@@ -53,20 +53,18 @@ char *base64encode(const unsigned char *buf, size_t *size)
 	unsigned char input[3];
 	unsigned int output[4];
 	while (n < *size) {
-		input[0] = buf[n++];
-		input[1] = (n < *size) ? buf[n++] : 0;
-		input[2] = (n < *size) ? buf[n++] : 0;
+		input[0] = buf[n];
+		input[1] = (n+1 < *size) ? buf[n+1] : 0;
+		input[2] = (n+2 < *size) ? buf[n+2] : 0;
 		output[0] = input[0] >> 2;
 		output[1] = ((input[0] & 3) << 4) + (input[1] >> 4);
 		output[2] = ((input[1] & 15) << 2) + (input[2] >> 6);
 		output[3] = input[2] & 63;
 		outbuf[m++] = base64_str[(int)output[0]];
 		outbuf[m++] = base64_str[(int)output[1]];
-		outbuf[m++] = base64_str[(int)output[2]];
-		outbuf[m++] = base64_str[(int)output[3]];
-	}
-	while ((m % 4) != 0) {
-		outbuf[m++] = base64_pad;
+		outbuf[m++] = (n+1 < *size) ? base64_str[(int)output[2]] : base64_pad;
+		outbuf[m++] = (n+2 < *size) ? base64_str[(int)output[3]] : base64_pad;
+		n+=3;
 	}
 	outbuf[m] = 0; // 0-termination!
 	*size = m;