Diff: numeric.h

Revision:

0:04990d454f45

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/numeric.h	Thu Oct 10 21:38:07 2013 +0000
@@ -0,0 +1,110 @@
+/* dtls -- a very basic DTLS implementation
+ *
+ * Copyright (C) 2011 Olaf Bergmann <bergmann@tzi.org>
+ *
+ * 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.
+ */
+
+#ifndef _NUMERIC_H_
+#define _NUMERIC_H_
+
+#include <stdint.h>
+
+#ifndef min
+#define min(A,B) ((A) <= (B) ? (A) : (B))
+#endif
+
+#ifndef max
+#define max(A,B) ((A) < (B) ? (B) : (A))
+#endif
+
+/**
+ * Increments given \p Var of type \p Type by \c 1.
+ *
+ * \hideinitializer
+ */
+#define inc_uint(Type,Var) {			\
+    int i = sizeof(Type);			\
+    while (i && !++((Var)[--i]));		\
+  }
+
+/* this one is for consistency... */
+#define dtls_int_to_uint8(Field,Value) do {			\
+    *(unsigned char*)(Field) = (Value) & 0xff;			\
+  } while(0)
+
+#define dtls_int_to_uint16(Field,Value) do {			\
+    *(unsigned char*)(Field) = ((Value) >> 8) & 0xff;		\
+    *(((unsigned char*)(Field))+1) = ((Value) & 0xff);		\
+  } while(0)
+
+#define dtls_int_to_uint24(Field,Value) do {			\
+    *(unsigned char*)(Field) = ((Value) >> 16) & 0xff;		\
+    dtls_int_to_uint16((((unsigned char*)(Field))+1),Value);	\
+  } while(0)
+
+#define dtls_int_to_uint32(Field,Value) do {				\
+    *(unsigned char*)(Field) = ((Value) >> 24) & 0xff;			\
+    *(((unsigned char*)(Field))+1) = ((Value) >> 16) & 0xff;		\
+    *(((unsigned char*)(Field))+2) = ((Value) >> 8) & 0xff;		\
+    *(((unsigned char*)(Field))+3) = (Value) & 0xff;			\
+  } while(0)
+
+#define dtls_ulong_to_uint48(Field,Value) do {				\
+    *(unsigned char*)(Field) = ((Value) >> 40) & 0xff;			\
+    *(((unsigned char*)(Field))+1) = ((Value) >> 32) & 0xff;		\
+    *(((unsigned char*)(Field))+2) = ((Value) >> 24) & 0xff;		\
+    *(((unsigned char*)(Field))+3) = ((Value) >> 16) & 0xff;		\
+    *(((unsigned char*)(Field))+4) = ((Value) >> 8) & 0xff;		\
+    *(((unsigned char*)(Field))+5) = (Value) & 0xff;			\
+  } while(0)
+
+#define dtls_ulong_to_uint64(Field,Value) do {				\
+    *(unsigned char*)(Field) = ((Value) >> 56) & 0xff;			\
+    *(((unsigned char*)(Field))+1) = ((Value) >> 48) & 0xff;		\
+    *(((unsigned char*)(Field))+2) = ((Value) >> 40) & 0xff;		\
+    *(((unsigned char*)(Field))+3) = ((Value) >> 32) & 0xff;		\
+    *(((unsigned char*)(Field))+4) = ((Value) >> 24) & 0xff;		\
+    *(((unsigned char*)(Field))+5) = ((Value) >> 16) & 0xff;		\
+    *(((unsigned char*)(Field))+6) = ((Value) >> 8) & 0xff;		\
+    *(((unsigned char*)(Field))+7) = (Value) & 0xff;			\
+  } while(0)
+
+#define dtls_uint8_to_int(Field) \
+  (*(unsigned char*)(Field) & 0xFF)
+
+#define dtls_uint16_to_int(Field) \
+  (((*(unsigned char*)(Field)) << 8) | (*(((unsigned char*)(Field))+1)))
+
+#define dtls_uint24_to_int(Field)		\
+  (((*(((unsigned char*)(Field)))) << 16)	\
+   | ((*(((unsigned char*)(Field))+1)) << 8)	\
+   | ((*(((unsigned char*)(Field))+2))))
+  
+#define dtls_uint48_to_ulong(Field)			\
+  (((uint64_t) *(unsigned char*)(Field)) << 40)		\
+  | (((uint64_t) *(((unsigned char*)(Field))+1)) << 32)	\
+  | (((uint64_t) *(((unsigned char*)(Field))+2)) << 24)	\
+  | (((uint64_t) *(((unsigned char*)(Field))+3)) << 16)	\
+  | (((uint64_t) *(((unsigned char*)(Field))+4)) << 8)	\
+  | (((uint64_t) *(((unsigned char*)(n))+5)))
+
+#endif /* _NUMERIC_H_ */