v2gv2gtp for 0.7

git-svn-id: https://svn.code.sf.net/p/openv2g/code/trunk@75 d9f2db14-54d0-4bde-b00c-16405c910529

src/transport/v2gtp.c

@@ -0,0 +1,97 @@
+
+/*
+ * Copyright (C) 2007-2012 Siemens AG
+ *
+ * This program 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 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*******************************************************************
+ *
+ * @author Sebastian.Kaebisch.EXT@siemens.com
+ * @version 0.7
+ * @contact Joerg.Heuer@siemens.com
+ *
+ ********************************************************************/
+
+/*
+ * This file implements the v2gtp header writer and reader.
+ *
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+#include "v2gtp.h"
+
+
+int write_v2gtpHeader(uint8_t* outStream, uint32_t* outStreamLength, uint16_t payloadType)
+{
+
+	/* write v2gtp version number 1=byte */
+	outStream[0]=V2GTP_VERSION;
+
+	/* write inverse v2gtp version */
+	outStream[1]=V2GTP_VERSION_INV;
+
+
+	/* write payload type */
+	outStream[3] = (uint8_t)(payloadType & 0xFF);
+	outStream[2] = (uint8_t)(payloadType >> 8 & 0xFF);
+
+	/* write payload length */
+	outStream[7] = (uint8_t)(*outStreamLength & 0xFF);
+	outStream[6] = (uint8_t)(*outStreamLength>>8 & 0xFF);
+	outStream[5] = (uint8_t)(*outStreamLength>>16 & 0xFF);
+	outStream[4] = (uint8_t)(*outStreamLength>>24 & 0xFF);
+
+	/* here, the outStream length have to be resized by the v2gtp offset*/
+	*outStreamLength += V2GTP_HEADER_LENGTH;
+
+	return 0;
+}
+
+int read_v2gtpHeader(uint8_t* inStream, uint32_t inStreamLength, uint32_t* payloadLength)
+{
+	uint16_t payloadType=0;
+
+
+	/* check, if we support this v2gtp version */
+	if(inStream[0]!=V2GTP_VERSION && inStream[1]!=V2GTP_VERSION_INV)
+		return -1;
+
+
+	/* check, if we support this payload type*/
+	payloadType = inStream[2];
+	payloadType = (payloadType << 8 | inStream[3]);
+
+	if(payloadType != V2GTP_EXI_TYPE)
+		return -1;
+
+
+	/* determine payload length*/
+	*payloadLength = inStream[4];
+	*payloadLength = (*payloadLength << 8 | inStream[5]);
+	*payloadLength = (*payloadLength << 16 | inStream[6]);
+	*payloadLength = (*payloadLength << 24 | inStream[7]);
+
+	if((*payloadLength+V2GTP_HEADER_LENGTH)!=inStreamLength)
+		return -1;
+
+	return 0;
+}
+

src/transport/v2gtp.h

@@ -0,0 +1,54 @@
+
+/*
+ * Copyright (C) 2007-2011 Siemens AG
+ *
+ * This program 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 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*******************************************************************
+ *
+ * @author Sebastian.Kaebisch.EXT@siemens.com
+ * @version 0.7
+ * @contact Joerg.Heuer@siemens.com
+ *
+ ********************************************************************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef V2GTP_H_
+#define V2GTP_H_
+
+#include <stdint.h>
+
+/* generic V2GTP header length */
+#define V2GTP_HEADER_LENGTH 8
+
+/* define V2GTP Version */
+#define V2GTP_VERSION 0x01
+#define V2GTP_VERSION_INV 0xFE
+
+/* define V2GTP payload types*/
+#define V2GTP_EXI_TYPE 0x8001
+
+int write_v2gtpHeader(uint8_t* outStream, uint32_t* outStreamLength, uint16_t payloadType);
+
+int read_v2gtpHeader(uint8_t* inStream, uint32_t inStreamLength, uint32_t* payloadLength);
+
+#endif /* V2GTP_H_ */
+
+#ifdef __cplusplus
+}
+#endif