1 files changed, 188 insertions, 0 deletions
diff --git a/libraries/Ethernet/Udp.cpp b/libraries/Ethernet/Udp.cpp
new file mode 100644
index 0000000..aed5d98
--- /dev/null
+++ b/libraries/Ethernet/Udp.cpp
@@ -0,0 +1,188 @@
+/*
+ *  Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
+ *  This version only offers minimal wrapping of socket.c/socket.h
+ *  Drop Udp.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
+ */
+
+#include "w5100.h"
+#include "socket.h"
+#include "Ethernet.h"
+#include "Udp.h"
+#include "Dns.h"
+
+/* Constructor */
+UDP::UDP() : _sock(MAX_SOCK_NUM) {}
+
+/* Start UDP socket, listening at local port PORT */
+uint8_t UDP::begin(uint16_t port) {
+  if (_sock != MAX_SOCK_NUM)
+    return 0;
+
+  for (int i = 0; i < MAX_SOCK_NUM; i++) {
+    uint8_t s = W5100.readSnSR(i);
+    if (s == SnSR::CLOSED || s == SnSR::FIN_WAIT) {
+      _sock = i;
+      break;
+    }
+  }
+
+  if (_sock == MAX_SOCK_NUM)
+    return 0;
+
+  _port = port;
+  socket(_sock, SnMR::UDP, _port, 0);
+
+  return 1;
+}
+
+/* Is data available in rx buffer? Returns 0 if no, number of available bytes if yes. 
+ * returned value includes 8 byte UDP header!*/
+int UDP::available() {
+  return W5100.getRXReceivedSize(_sock);
+}
+
+/* Release any resources being used by this UDP instance */
+void UDP::stop()
+{
+  if (_sock == MAX_SOCK_NUM)
+    return;
+
+  close(_sock);
+
+  EthernetClass::_server_port[_sock] = 0;
+  _sock = MAX_SOCK_NUM;
+}
+
+int UDP::beginPacket(const char *host, uint16_t port)
+{
+  // Look up the host first
+  int ret = 0;
+  DNSClient dns;
+  IPAddress remote_addr;
+
+  dns.begin(Ethernet.dnsServerIP());
+  ret = dns.getHostByName(host, remote_addr);
+  if (ret == 1) {
+    return beginPacket(remote_addr, port);
+  } else {
+    return ret;
+  }
+}
+
+int UDP::beginPacket(IPAddress ip, uint16_t port)
+{
+  _offset = 0;
+  return startUDP(_sock, ip.raw_address(), port);
+}
+
+int UDP::endPacket()
+{
+  return sendUDP(_sock);
+}
+
+void UDP::write(uint8_t byte)
+{
+  write(&byte, 1);
+}
+
+void UDP::write(const char *str)
+{
+  size_t len = strlen(str);
+  write((const uint8_t *)str, len);
+}
+
+void UDP::write(const uint8_t *buffer, size_t size)
+{
+  uint16_t bytes_written = bufferData(_sock, _offset, buffer, size);
+  _offset += bytes_written;
+}
+
+int UDP::parsePacket()
+{
+  if (available() > 0)
+  {
+    //HACK - hand-parse the UDP packet using TCP recv method
+    uint8_t tmpBuf[8];
+    int ret =0;	
+    //read 8 header bytes and get IP and port from it
+    ret = recv(_sock,tmpBuf,8);
+    if (ret > 0)
+    {
+      _remoteIP = tmpBuf;
+      _remotePort = tmpBuf[4];
+      _remotePort = (_remotePort << 8) + tmpBuf[5];
+      // When we get here, any remaining bytes are the data
+      ret = available();
+    }
+    return ret;
+  }
+  // There aren't any packets available
+  return 0;
+}
+
+int UDP::read()
+{
+  uint8_t byte;
+  if (recv(_sock, &byte, 1) > 0)
+  {
+    // We read things without any problems
+    return byte;
+  }
+  // If we get here, there's no data available
+  return -1;
+}
+
+int UDP::read(unsigned char* buffer, size_t len)
+{
+  /* In the readPacket that copes with truncating packets, the buffer was
+     filled with this code.  Not sure why it loops round reading out a byte
+     at a time.
+  int i;
+  for(i=0;i<(int)bufLen;i++) {
+    recv(_sock,tmpBuf,1);
+    buf[i]=tmpBuf[0];
+  }
+  */
+  return recv(_sock, buffer, len);
+}
+
+int UDP::peek()
+{
+  uint8_t b;
+  // Unlike recv, peek doesn't check to see if there's any data available, so we must
+  if (!available())
+    return -1;
+  ::peek(_sock, &b);
+  return b;
+}
+
+void UDP::flush()
+{
+  while (available())
+  {
+    read();
+  }
+}
+