Add FreeRTOS-Plus directory.

FreeRTOS/Demo/Common/ethernet/FreeRTOS-uIP/uip-split.c

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+/*
+ * Copyright (c) 2004, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the uIP TCP/IP stack
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: uip-split.c,v 1.2 2006/06/12 08:00:30 adam Exp $
+ */
+#include <string.h>
+
+#include "uip-split.h"
+#include "uip.h"
+#include "uip-fw.h"
+#include "uip_arch.h"
+
+#define BUF ( ( struct uip_tcpip_hdr * ) &uip_buf[UIP_LLH_LEN] )
+
+/*-----------------------------------------------------------------------------*/
+void uip_split_output( void )
+{
+	u16_t	tcplen, len1, len2;
+
+	/* We only try to split maximum sized TCP segments. */
+	if( BUF->proto == UIP_PROTO_TCP && uip_len == UIP_BUFSIZE - UIP_LLH_LEN )
+	{
+		tcplen = uip_len - UIP_TCPIP_HLEN;
+
+		/* Split the segment in two. If the original packet length was
+       odd, we make the second packet one byte larger. */
+		len1 = len2 = tcplen / 2;
+		if( len1 + len2 < tcplen )
+		{
+			++len2;
+		}
+
+		/* Create the first packet. This is done by altering the length
+       field of the IP header and updating the checksums. */
+		uip_len = len1 + UIP_TCPIP_HLEN;
+		#if UIP_CONF_IPV6
+
+		/* For IPv6, the IP length field does not include the IPv6 IP header
+       length. */
+		BUF->len[0] = ( (uip_len - UIP_IPH_LEN) >> 8 );
+		BUF->len[1] = ( (uip_len - UIP_IPH_LEN) & 0xff );
+		#else /* UIP_CONF_IPV6 */
+		BUF->len[0] = uip_len >> 8;
+		BUF->len[1] = uip_len & 0xff;
+		#endif /* UIP_CONF_IPV6 */
+
+		/* Recalculate the TCP checksum. */
+		BUF->tcpchksum = 0;
+		BUF->tcpchksum = ~( uip_tcpchksum() );
+
+		#if !UIP_CONF_IPV6
+
+		/* Recalculate the IP checksum. */
+		BUF->ipchksum = 0;
+		BUF->ipchksum = ~( uip_ipchksum() );
+		#endif /* UIP_CONF_IPV6 */
+
+		/* Transmit the first packet. */
+
+		/*    uip_fw_output();*/
+
+		//    tcpip_output();
+
+		/* Now, create the second packet. To do this, it is not enough to
+       just alter the length field, but we must also update the TCP
+       sequence number and point the uip_appdata to a new place in
+       memory. This place is detemined by the length of the first
+       packet (len1). */
+		uip_len = len2 + UIP_TCPIP_HLEN;
+		#if UIP_CONF_IPV6
+
+		/* For IPv6, the IP length field does not include the IPv6 IP header
+       length. */
+		BUF->len[0] = ( (uip_len - UIP_IPH_LEN) >> 8 );
+		BUF->len[1] = ( (uip_len - UIP_IPH_LEN) & 0xff );
+		#else /* UIP_CONF_IPV6 */
+		BUF->len[0] = uip_len >> 8;
+		BUF->len[1] = uip_len & 0xff;
+		#endif /* UIP_CONF_IPV6 */
+
+		/*    uip_appdata += len1;*/
+		memcpy( uip_appdata, ( u8_t * ) uip_appdata + len1, len2 );
+
+		uip_add32( BUF->seqno, len1 );
+		BUF->seqno[0] = uip_acc32[0];
+		BUF->seqno[1] = uip_acc32[1];
+		BUF->seqno[2] = uip_acc32[2];
+		BUF->seqno[3] = uip_acc32[3];
+
+		/* Recalculate the TCP checksum. */
+		BUF->tcpchksum = 0;
+		BUF->tcpchksum = ~( uip_tcpchksum() );
+
+		#if !UIP_CONF_IPV6
+
+		/* Recalculate the IP checksum. */
+		BUF->ipchksum = 0;
+		BUF->ipchksum = ~( uip_ipchksum() );
+		#endif /* UIP_CONF_IPV6 */
+
+		/* Transmit the second packet. */
+
+		/*    uip_fw_output();*/
+
+		//    tcpip_output();
+	}
+	else
+	{
+		/*    uip_fw_output();*/
+
+		//    tcpip_output();
+	}
+}
+
+/*-----------------------------------------------------------------------------*/