From: Simon Josefsson <simon@josefsson.org>
Date: Tue, 24 Aug 2004 14:29:00 +0000 (+0200)
Subject: (LE_READ_UINT16, LE_WRITE_UINT16): New macros.
X-Git-Tag: nettle_1.11_release_20041026~68
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=ffcdc8c6d2ea0730de2291f352571418a537a155;p=thirdparty%2Fnettle.git

(LE_READ_UINT16, LE_WRITE_UINT16): New macros.

Rev: src/nettle/macros.h:1.7
---

diff --git a/macros.h b/macros.h
index 89400c54..52876976 100644
--- a/macros.h
+++ b/macros.h
@@ -78,6 +78,17 @@ do {						\
   (p)[0] = (i) & 0xff;				\
 } while(0)
 
+/* Analogous macros, for 16 bit numbers */
+#define LE_READ_UINT16(p)			\
+  (  (((uint32_t) (p)[1]) << 8)			\
+     |  ((uint32_t) (p)[0]))
+
+#define LE_WRITE_UINT16(p, i)			\
+  do {						\
+    (p)[1] = ((i) >> 8) & 0xff;			\
+    (p)[0] = (i) & 0xff;			\
+  } while(0)
+
 /* Macro to make it easier to loop over several blocks. */
 #define FOR_BLOCKS(length, dst, src, blocksize)	\
   assert( !((length) % (blocksize)));           \