our current experimental Neutrino branch

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@27 e54a6e83-5905-42d5-8d5c-058d10e6a962

lib/connection/messagetools.cpp

@@ -0,0 +1,96 @@
+/*
+ * $Header: /cvs/tuxbox/apps/misc/libs/libconnection/messagetools.cpp,v 1.1 2002/12/07 13:37:06 thegoodguy Exp $
+ *
+ * tools used in clientlib <-> daemon communication - d-box2 linux project
+ *
+ * (C) 2002 by thegoodguy <thegoodguy@berlios.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include "messagetools.h"
+
+size_t write_length_field (unsigned char * buffer, unsigned int length)
+{
+        if (length < 128)
+        {
+                buffer[0] = length;
+                return 1;
+        }
+        else
+        {
+                unsigned int pos = 0;
+                unsigned int shiftby = 8;
+                unsigned char length_field_size = 1;
+
+                while ((length >> shiftby) != 0)
+                {
+                        length_field_size++;
+                        shiftby += 8;
+                }
+
+                buffer[pos++] = ((1 << 7) | length_field_size);
+
+                while (shiftby != 0)
+                {
+			shiftby -= 8;
+                        buffer[pos++] = length >> shiftby;
+                }
+                return pos;
+        }
+
+}
+
+unsigned int parse_length_field (const unsigned char * buffer)
+{
+	unsigned char size_indicator = (buffer[0] >> 7) & 0x01;
+	unsigned int length_value = 0;
+
+	if (size_indicator == 0)
+	{
+		length_value = buffer[0] & 0x7F;
+	}
+
+	else if (size_indicator == 1)
+	{
+		unsigned char length_field_size = buffer[0] & 0x7F;
+		unsigned int i;
+
+		for (i = 0; i < length_field_size; i++)
+		{
+			length_value = (length_value << 8) | buffer[i + 1];
+		}
+	}
+
+	return length_value;
+}
+
+size_t get_length_field_size (const unsigned int length)
+{
+	if (length < 0x80)
+		return 0x01;
+
+	if (length < 0x100)
+		return 0x02;
+
+	if (length < 0x10000)
+		return 0x03;
+
+	if (length < 0x1000000)
+		return 0x04;
+	
+	return 0x05;
+}