From 002a2c3e1d0f091a48f8cc3eb7dce519870debaf Mon Sep 17 00:00:00 2001
From: Yves Fischer <yvesf-git@xapek.org>
Date: Sat, 11 Jan 2014 18:44:50 +0100
Subject: import code

---
 jni/iodine/src/encoding.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 jni/iodine/src/encoding.c

(limited to 'jni/iodine/src/encoding.c')

diff --git a/jni/iodine/src/encoding.c b/jni/iodine/src/encoding.c
new file mode 100644
index 0000000..896d67d
--- /dev/null
+++ b/jni/iodine/src/encoding.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2006-2009 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include "common.h"
+#include "encoding.h"
+
+int
+build_hostname(char *buf, size_t buflen, 
+		const char *data, const size_t datalen, 
+		const char *topdomain, struct encoder *encoder, int maxlen)
+{
+	int encsize;
+	size_t space;
+	char *b;
+
+	space = MIN(maxlen, buflen) - strlen(topdomain) - 8;
+	/* 8 = 5 max header length + 1 dot before topdomain + 2 safety */
+
+	if (!encoder->places_dots())
+		space -= (space / 57); /* space for dots */
+
+	memset(buf, 0, buflen);
+	
+	encsize = encoder->encode(buf, &space, data, datalen);
+
+	if (!encoder->places_dots())
+		inline_dotify(buf, buflen);
+
+	b = buf;
+	b += strlen(buf);
+
+	/* move b back one step to see if the dot is there */
+	b--;
+	if (*b != '.') 
+		*++b = '.';
+	b++;
+	/* move b ahead of the string so we can copy to it */
+
+	strncpy(b, topdomain, strlen(topdomain)+1);
+
+	return space;
+}
+
+int
+unpack_data(char *buf, size_t buflen, char *data, size_t datalen, struct encoder *enc)
+{
+	if (!enc->eats_dots())
+		datalen = inline_undotify(data, datalen);
+	return enc->decode(buf, &buflen, data, datalen);
+}
+
+int 
+inline_dotify(char *buf, size_t buflen)
+{
+	unsigned dots;
+	unsigned pos;
+	unsigned total;
+	char *reader, *writer;
+
+	total = strlen(buf);
+	dots = total / 57;
+
+	writer = buf;
+	writer += total;
+	writer += dots;
+
+	total += dots;
+	if (strlen(buf) + dots > buflen) {
+		writer = buf;
+		writer += buflen;
+		total = buflen;
+	}
+
+	reader = writer - dots;
+	pos = (unsigned) (reader - buf) + 1;
+
+	while (dots) {
+		*writer-- = *reader--;
+		pos--;
+		if (pos % 57 == 0) {
+			*writer-- = '.';
+			dots--;
+		}
+	}
+
+	/* return new length of string */
+	return total;
+}
+
+int 
+inline_undotify(char *buf, size_t len)
+{
+	unsigned pos;
+	unsigned dots;
+	char *reader, *writer;
+
+	writer = buf;
+	reader = writer;
+
+	pos = 0;
+	dots = 0;
+
+	while (pos < len) {
+		if (*reader == '.') {
+			reader++;
+			pos++;
+			dots++;
+			continue;
+		}
+		*writer++ = *reader++;
+		pos++;
+	}
+	
+	/* return new length of string */
+	return len - dots;
+}
-- 
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