From 4e5fb4b60c59db3248fd12db2bc6f0424d798122 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Sun, 25 Apr 2010 20:12:34 +0200
Subject: [PATCH] Skip LSA host<->network endianity conversions on big endians.

---
 proto/ospf/lsalib.c |  6 ++++--
 proto/ospf/lsalib.h | 12 ++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/proto/ospf/lsalib.c b/proto/ospf/lsalib.c
index 53c25623..c932fe04 100644
--- a/proto/ospf/lsalib.c
+++ b/proto/ospf/lsalib.c
@@ -87,6 +87,7 @@ ospf_age(struct proto_ospf *po)
   }
 }
 
+#ifndef CPU_BIG_ENDIAN
 void
 htonlsah(struct ospf_lsa_header *h, struct ospf_lsa_header *n)
 {
@@ -138,6 +139,7 @@ ntohlsab(void *n, void *h, u16 len)
   for (i = 0; i < (len / sizeof(u32)); i++)
     hid[i] = ntohl(nid[i]);
 }
+#endif /* little endian */
 
 /*
 void
@@ -184,7 +186,7 @@ lsasum_calculate(struct ospf_lsa_header *h, void *body)
 
   //  log(L_WARN "Checksum %R %R %d start (len %d)", h->id, h->rt, h->type, length);
   htonlsah(h, h);
-  htonlsab(body, body, length - sizeof(struct ospf_lsa_header));
+  htonlsab1(body, length - sizeof(struct ospf_lsa_header));
 
   /*
   char buf[1024];
@@ -198,7 +200,7 @@ lsasum_calculate(struct ospf_lsa_header *h, void *body)
   //  log(L_WARN "Checksum result %4x", h->checksum);
 
   ntohlsah(h, h);
-  ntohlsab(body, body, length - sizeof(struct ospf_lsa_header));
+  ntohlsab1(body, length - sizeof(struct ospf_lsa_header));
 }
 
 /*
diff --git a/proto/ospf/lsalib.h b/proto/ospf/lsalib.h
index a799de31..f98a1bd3 100644
--- a/proto/ospf/lsalib.h
+++ b/proto/ospf/lsalib.h
@@ -10,10 +10,22 @@
 #ifndef _BIRD_OSPF_LSALIB_H_
 #define _BIRD_OSPF_LSALIB_H_
 
+#ifdef CPU_BIG_ENDIAN
+static inline void htonlsah(struct ospf_lsa_header *h, struct ospf_lsa_header *n) { *n = *h; };
+static inline void ntohlsah(struct ospf_lsa_header *n, struct ospf_lsa_header *h) { *h = *n; };
+static inline void htonlsab(void *h, void *n, u16 len) { memcpy(n, h, len); };
+static inline void ntohlsab(void *n, void *h, u16 len) { memcpy(h, n, len); };
+static inline void htonlsab1(void *h, u16 len) { };
+static inline void ntohlsab1(void *n, u16 len) { };
+#else
 void htonlsah(struct ospf_lsa_header *h, struct ospf_lsa_header *n);
 void ntohlsah(struct ospf_lsa_header *n, struct ospf_lsa_header *h);
 void htonlsab(void *h, void *n, u16 len);
 void ntohlsab(void *n, void *h, u16 len);
+static inline void htonlsab1(void *h, u16 len) { htonlsab(h, h, len); };
+static inline void ntohlsab1(void *n, u16 len) { ntohlsab(n, n, len); };
+#endif
+
 void lsasum_calculate(struct ospf_lsa_header *header, void *body);
 u16 lsasum_check(struct ospf_lsa_header *h, void *body);
 #define CMP_NEWER 1