arduino_osc / libraries / Ethernet / UdpRaw.cpp

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bjoern acc28fc 

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bjoern f8a4a16 


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/*
 *  UdpRaw.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
 *  This version only offers minimal wrapping of socket.c/socket.h
 *  Drop UdpRaw.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/ 
 *
 * MIT License:
 * Copyright (c) 2008 Bjoern Hartmann
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * bjoern@cs.stanford.edu 12/30/2008
 */

extern "C" {
#include "types.h"
#include "w5100.h"
#include "socket.h"
}

#include "Ethernet.h"
#include "UdpRaw.h"

/* Start UDP socket, listening at local port PORT */
void UdpRawClass::begin(uint16_t port) {
	_port = port;
	_sock = 0; //TODO: should not be hardcoded
	socket(_sock,Sn_MR_UDP,_port,0);
}

/* Send packet contained in buf of length len to peer at specified ip, and port */
/* Use this function to transmit binary data that might contain 0x00 bytes*/
/* This function returns sent data size for success else -1. */
uint16_t UdpRawClass::sendPacket(uint8_t * buf, uint16_t len,  uint8_t * ip, uint16_t port){
	return sendto(_sock,(const uint8_t *)buf,len,ip,port);
}

/* Send  zero-terminated string str as packet to peer at specified ip, and port */
/* This function returns sent data size for success else -1. */
uint16_t UdpRawClass::sendPacket(const char str[], uint8_t * ip, uint16_t port){	
	// compute strlen
	const char *s;
	for(s = str; *s; ++s);
	uint16_t len = (s-str);
	// send packet
	return sendto(_sock,(const uint8_t *)str,len,ip,port);
}
/* Is data available in rx buffer? Returns 0 if no, number of available bytes if yes. 
 * returned value includes 8 byte UDP header!*/
int UdpRawClass::available() {
	return getSn_RX_RSR(_sock);
}


/* Read a received packet into buffer buf (which is of maximum length len); */
/* store calling ip and port as well. Call available() to make sure data is ready first. */
/* NOTE: I don't believe len is ever checked in implementation of recvfrom(),*/
/*       so it's easy to overflow buffer. so we check and truncate. */
/* returns number of bytes read, or negative number of bytes we would have needed if we truncated */
int UdpRawClass::readPacket(uint8_t * buf, uint16_t bufLen, uint8_t *ip, uint16_t *port) {
	int packetLen = available()-8; //skip UDP header;
	if(packetLen < 0 ) return 0; // no real data here	
	if(packetLen > (int)bufLen) {
		//packet is too large - truncate
		//HACK - hand-parse the UDP packet using TCP recv method
		uint8_t tmpBuf[8];
		int i;
		//read 8 header bytes and get IP and port from it
		recv(_sock,tmpBuf,8);
		ip[0] = tmpBuf[0];
		ip[1] = tmpBuf[1];
		ip[2] = tmpBuf[2];
		ip[3] = tmpBuf[3];
		*port = tmpBuf[4];
		*port = (*port << 8) + tmpBuf[5];
		
		//now copy first (bufLen) bytes into buf		
		for(i=0;i<(int)bufLen;i++) {
			recv(_sock,tmpBuf,1);
			buf[i]=tmpBuf[0];
		}
		
		//and just read the rest byte by byte and throw it away
		while(available()) {
			recv(_sock,tmpBuf,1);
		}
		
		return (-1*packetLen);
		
		//ALTERNATIVE: requires stdlib - takes a bunch of space
		/*//create new buffer and read everything into it
		uint8_t * tmpBuf = (uint8_t *)malloc(packetLen);
		recvfrom(_sock,tmpBuf,packetLen,ip,port);
		if(!tmpBuf) return 0; //couldn't allocate
		// copy first bufLen bytes
		for(unsigned int i=0; i<bufLen; i++) {
			buf[i]=tmpBuf[i];
		}
		//free temp buffer
		free(tmpBuf);
		*/
		
		
	} 
	return recvfrom(_sock,buf,bufLen,ip,port);
}

/* Read a received packet, throw away peer's ip and port.  See note above. */
int UdpRawClass::readPacket(uint8_t * buf, uint16_t len) {
	uint8_t ip[4];
	uint16_t port[1];
	return recvfrom(_sock,buf,len,ip,port);
}




/* Create one global object */
UdpRawClass UdpRaw;
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