add iksemel to in tree libs

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3756 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/iksemel/src/base64.c

@@ -0,0 +1,98 @@
+/* iksemel (XML parser for Jabber)
+** Copyright (C) 2000-2003 Gurer Ozen <madcat@e-kolay.net>
+** This code is free software; you can redistribute it and/or
+** modify it under the terms of GNU Lesser General Public License.
+*/
+
+#include "common.h"
+#include "iksemel.h"
+
+static char base64_charset[] =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+
+char *iks_base64_decode(const char *buf)
+{
+	char *res, *save, *foo, val;
+	const char *end;
+	int index;
+
+	if (!buf)
+		return NULL;
+
+	index = iks_strlen(buf)*6 / 8 + 1;
+	save = res = iks_malloc(index);
+	memset(res, 0, index);
+	index = 0;
+
+	if (!save)
+		return NULL;
+
+	end = buf + iks_strlen(buf);
+
+	while (*buf && buf < end) {
+		if (!(foo = strchr(base64_charset, *buf)))
+			foo = base64_charset;
+		val = (int)(foo - base64_charset);
+		buf++;
+		switch (index) {
+			case 0:
+				*res |= val << 2;
+				break;
+			case 1:
+				*res++ |= val >> 4;
+				*res |= val << 4;
+				break;
+			case 2:
+				*res++ |= val >> 2;
+				*res |= val << 6;
+				break;
+			case 3:
+				*res++ |= val;
+				break;
+		}
+		index++;
+		index %= 4;
+	}
+	*res = 0;
+
+	return save;
+}
+
+char *iks_base64_encode(const char *buf, int len)
+{
+	char *res, *save;
+	int k, t;
+
+	len = (len > 0) ? (len) : (iks_strlen(buf));
+	save = res = iks_malloc((len*8) / 6 + 4);
+
+	for (k = 0; k < len/3; ++k) {
+		*res++ = base64_charset[*buf >> 2];
+		t = ((*buf & 0x03) << 4);
+		buf++;
+		*res++ = base64_charset[t | (*buf >> 4)];
+		t = ((*buf & 0x0F) << 2);
+		buf++;
+		*res++ = base64_charset[t | (*buf >> 6)];
+		*res++ = base64_charset[*buf++ & 0x3F];
+	}
+
+	switch (len % 3) {
+		case 2:
+			*res++ = base64_charset[*buf >> 2];
+			t =  ((*buf & 0x03) << 4);
+			buf++;
+			*res++ = base64_charset[t | (*buf >> 4)];
+			*res++ = base64_charset[((*buf++ & 0x0F) << 2)];
+			break;
+		case 1:
+			*res++ = base64_charset[*buf >> 2];
+			*res++ = base64_charset[(*buf++ & 0x03) << 4];
+			break;
+	}
+	*res++ = '=';
+	*res++ = '=';
+	*res = 0;
+	return save;
+}