diff --git a/ap/app/qrencode/bitstream.c b/ap/app/qrencode/bitstream.c
new file mode 100644
index 0000000..a0b9283
--- /dev/null
+++ b/ap/app/qrencode/bitstream.c
@@ -0,0 +1,238 @@
+/*
+ * qrencode - QR Code encoder
+ *
+ * Binary sequence class.
+ * Copyright (C) 2006-2011 Kentaro Fukuchi <kentaro@fukuchi.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "bitstream.h"
+
+BitStream *BitStream_new(void)
+{
+	BitStream *bstream;
+
+	bstream = (BitStream *)malloc(sizeof(BitStream));
+	if(bstream == NULL) return NULL;
+
+	bstream->length = 0;
+	bstream->data = NULL;
+
+	return bstream;
+}
+
+static int BitStream_allocate(BitStream *bstream, int length)
+{
+	unsigned char *data;
+
+	if(bstream == NULL) {
+		return -1;
+	}
+
+	data = (unsigned char *)malloc(length);
+	if(data == NULL) {
+		return -1;
+	}
+
+	if(bstream->data) {
+		free(bstream->data);
+	}
+	bstream->length = length;
+	bstream->data = data;
+
+	return 0;
+}
+
+static BitStream *BitStream_newFromNum(int bits, unsigned int num)
+{
+	unsigned int mask;
+	int i;
+	unsigned char *p;
+	BitStream *bstream;
+
+	bstream = BitStream_new();
+	if(bstream == NULL) return NULL;
+
+	if(BitStream_allocate(bstream, bits)) {
+		BitStream_free(bstream);
+		return NULL;
+	}
+
+	p = bstream->data;
+	mask = 1 << (bits - 1);
+	for(i=0; i<bits; i++) {
+		if(num & mask) {
+			*p = 1;
+		} else {
+			*p = 0;
+		}
+		p++;
+		mask = mask >> 1;
+	}
+
+	return bstream;
+}
+
+static BitStream *BitStream_newFromBytes(int size, unsigned char *data)
+{
+	unsigned char mask;
+	int i, j;
+	unsigned char *p;
+	BitStream *bstream;
+
+	bstream = BitStream_new();
+	if(bstream == NULL) return NULL;
+
+	if(BitStream_allocate(bstream, size * 8)) {
+		BitStream_free(bstream);
+		return NULL;
+	}
+
+	p = bstream->data;
+	for(i=0; i<size; i++) {
+		mask = 0x80;
+		for(j=0; j<8; j++) {
+			if(data[i] & mask) {
+				*p = 1;
+			} else {
+				*p = 0;
+			}
+			p++;
+			mask = mask >> 1;
+		}
+	}
+
+	return bstream;
+}
+
+int BitStream_append(BitStream *bstream, BitStream *arg)
+{
+	unsigned char *data;
+
+	if(arg == NULL) {
+		return -1;
+	}
+	if(arg->length == 0) {
+		return 0;
+	}
+	if(bstream->length == 0) {
+		if(BitStream_allocate(bstream, arg->length)) {
+			return -1;
+		}
+		memcpy(bstream->data, arg->data, arg->length);
+		return 0;
+	}
+
+	data = (unsigned char *)malloc(bstream->length + arg->length);
+	if(data == NULL) {
+		return -1;
+	}
+	memcpy(data, bstream->data, bstream->length);
+	memcpy(data + bstream->length, arg->data, arg->length);
+
+	free(bstream->data);
+	bstream->length += arg->length;
+	bstream->data = data;
+
+	return 0;
+}
+
+int BitStream_appendNum(BitStream *bstream, int bits, unsigned int num)
+{
+	BitStream *b;
+	int ret;
+
+	if(bits == 0) return 0;
+
+	b = BitStream_newFromNum(bits, num);
+	if(b == NULL) return -1;
+
+	ret = BitStream_append(bstream, b);
+	BitStream_free(b);
+
+	return ret;
+}
+
+int BitStream_appendBytes(BitStream *bstream, int size, unsigned char *data)
+{
+	BitStream *b;
+	int ret;
+
+	if(size == 0) return 0;
+
+	b = BitStream_newFromBytes(size, data);
+	if(b == NULL) return -1;
+
+	ret = BitStream_append(bstream, b);
+	BitStream_free(b);
+
+	return ret;
+}
+
+unsigned char *BitStream_toByte(BitStream *bstream)
+{
+	int i, j, size, bytes;
+	unsigned char *data, v;
+	unsigned char *p;
+
+	size = BitStream_size(bstream);
+	if(size == 0) {
+		return NULL;
+	}
+	data = (unsigned char *)malloc((size + 7) / 8);
+	if(data == NULL) {
+		return NULL;
+	}
+
+	bytes = size  / 8;
+
+	p = bstream->data;
+	for(i=0; i<bytes; i++) {
+		v = 0;
+		for(j=0; j<8; j++) {
+			v = v << 1;
+			v |= *p;
+			p++;
+		}
+		data[i] = v;
+	}
+	if(size & 7) {
+		v = 0;
+		for(j=0; j<(size & 7); j++) {
+			v = v << 1;
+			v |= *p;
+			p++;
+		}
+		data[bytes] = v;
+	}
+
+	return data;
+}
+
+void BitStream_free(BitStream *bstream)
+{
+	if(bstream != NULL) {
+		free(bstream->data);
+		free(bstream);
+	}
+}