From 1099eeae24b28306022ae3663a2766261b3455e4 Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Tue, 18 Oct 2005 12:07:40 +0000
Subject: *** empty log message ***

---
 src/multicast.cc | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 60 insertions(+), 2 deletions(-)

(limited to 'src/multicast.cc')

diff --git a/src/multicast.cc b/src/multicast.cc
index 34c7241..ff3f557 100644
--- a/src/multicast.cc
+++ b/src/multicast.cc
@@ -27,25 +27,83 @@
 #include "config.h"
 #include "multicast.h"
 
+#include "miav_config.h"
+
+#include <sys/socket.h>
 #include <netinet/in.h>
 #include <netdb.h>
-#include <sys/socket.h>
 #include <sys/param.h>
 #include <arpa/inet.h>
+#include <sys/types.h>
+
+// For IP_MTU
+//#include <linux/in.h>
+//#ifndef IP_MTU
+//#define IP_MTU 14
+//#endif
+
+#include <errno.h>
 
 Multicast::Multicast(Info *i, char *addr, int port)
 {
   info = i;
+  udp_buffer = NULL;
+
+  // Open connection socket
   if(!UDPOpen(addr, port)) info->error("Error creating socket %s:%d", addr, port);
+
+  int mtu = config->readInt("udp_packet_size");
+
+  // Create buffer with the size of MTU
+  //  socklen_t mtu_sz;
+  //  if(getsockopt(sock, SOL_IP, IP_MTU, &mtu, &mtu_sz) != -1) {
+
+  udp_buffer_size = mtu - 28;
+  if(udp_buffer_size < 1) udp_buffer_size = 1;
+  udp_buffer = new char[udp_buffer_size];
+  udp_buffer_pointer = udp_buffer;
+  info->info("UDP packet buffer size %db", udp_buffer_size);
+
+  //} else {
+  //    info->error("Error getting MTU size from socket: %s", strerror(errno));
+  //    return;
+  //}
 }
 
 Multicast::~Multicast()
 {
+  if(udp_buffer) delete udp_buffer;
 }
 
 void Multicast::Write(void* buf, int size)
 {
-  if(write(sock, buf, size) != size) info->error("Error Writing to socket.");
+  if(!udp_buffer) return; // no buffer to write in... better break out!
+
+  //  info->info("To send: %d", size);
+
+  char *p = (char*)buf;
+  int left = udp_buffer_size - (udp_buffer_pointer - udp_buffer);
+ 
+  while(size) {
+    int to_copy = size > left ? left : size;
+    
+    memcpy(udp_buffer_pointer, p, to_copy);
+  
+    left-=to_copy;
+    udp_buffer_pointer += to_copy;
+
+    p+=to_copy;
+    size-=to_copy;
+
+    //    info->info("Copied %d - %d to go", to_copy, size);
+
+    if(left == 0) {
+      //      info->info("Sending full packet");
+      write(sock, udp_buffer, udp_buffer_size);
+      left = udp_buffer_size;
+      udp_buffer_pointer = udp_buffer;
+    }
+  }
 }
 
 bool Multicast::is_address_multicast(unsigned long address)
-- 
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