Diff: net/net.h

Revision:

0:7e2eb93442e7

diff -r 000000000000 -r 7e2eb93442e7 net/net.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/net/net.h	Sun Dec 12 19:34:41 2010 +0000
@@ -0,0 +1,88 @@
+/**
+ @file net.h
+ @brief This file encompasses all of the networking headers and includes them automatically
+ 
+ This file has some utility functions and definitions used by all of the networking headers,
+ and includes them all.  This is the only file necessary to include to use all of the networking
+ facilities in nettool
+*/
+
+#ifndef NETWORK_H
+#define NETWORK_H
+
+#include "mbed.h"
+
+#include "ctype.h"
+
+/// General networking checksum - Used for IP, TCP, UDP, ICMP, etc.
+/// Computes the one's complement of the one's complement sum of all of the given bytes except for the memory
+/// at skip_byte for skip_count bytes (e.g. the checksum).  Optionally resumes computation from the (given) last checksum.
+inline u16 checksum(void *_mem, unsigned int bytes, void *skip_byte = NULL, unsigned int skip_count = 0, u16 last = 0)
+{
+  u32 sum = 0;
+  u16 *mem = (u16*)_mem;
+  unsigned int skip_start = (u16*)skip_byte - mem;
+  
+  if (last)
+    sum = last ^ 0xFFFF;
+  
+  //main_log.printf("CK:            0x%8X", sum);
+  for (register unsigned int i = 0; i < bytes/sizeof(u16); ++i)
+  {
+    // Skip bytes we don't use (e.g. the checksum itself)
+    if (i == skip_start)
+      i += skip_count/sizeof(u16);
+    
+    // Sum them up
+    sum += mem[i];
+    
+    //main_log.printf("CK: + 0x%04X = 0x%8X", mem[i], sum);
+  }
+    
+  // One's complement of the one's complement sum
+  sum += sum >> 16;
+  sum &= 0xFFFF;
+  sum ^= 0xFFFF;
+  
+  //main_log.printf("CK:          ~ 0x%8X", sum);
+  
+  return (u16)(sum);
+}
+
+/// Generic u16 endian swapping
+inline void fix_endian_u16(u16 *p)
+{
+  char *bytes = (char*)p;
+  bytes[0] ^= bytes[1];
+  bytes[1] ^= bytes[0];
+  bytes[0] ^= bytes[1];
+}
+
+/// Generic u32 endian swapping
+inline void fix_endian_u32(u32 *p)
+{
+  char *bytes = (char*)p;
+  // Swap outer bytes
+  bytes[0] ^= bytes[3];
+  bytes[3] ^= bytes[0];
+  bytes[0] ^= bytes[3];
+  // Swap inner bytes
+  bytes[1] ^= bytes[2];
+  bytes[2] ^= bytes[1];
+  bytes[1] ^= bytes[2];
+}
+
+/* Printing character */
+#define PCHAR(x) (isprint(x)?(x):'.')
+
+
+// Ethernet
+#include "ethernet.h"
+
+// ARP and IP
+#include "ip.h"
+
+// TCP, UDP, and ICMP
+#include "udp.h"
+
+#endif // NETWORK_H
\ No newline at end of file