X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurity_utilities/lib/endian.h

diff --git a/Security/libsecurity_utilities/lib/endian.h b/Security/libsecurity_utilities/lib/endian.h
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+/*
+ * Copyright (c) 2002-2004,2011-2012,2014 Apple Inc. All Rights Reserved.
+ * 
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+/*
+ * cssm utilities
+ */
+#ifndef _H_ENDIAN
+#define _H_ENDIAN
+
+#include <machine/endian.h>
+#include <libkern/OSByteOrder.h>
+#include <security_utilities/utilities.h>
+#include <security_utilities/memutils.h>
+#include <security_utilities/debugging.h>
+
+namespace Security {
+
+
+//
+// Encode/decode operations by type, overloaded.
+// You can use these functions directly, but consider using
+// the higher-level constructs below instead.
+//
+#ifdef __LP64__
+static inline unsigned long h2n(unsigned long v) { return OSSwapHostToBigInt64(v); }
+static inline unsigned long n2h(unsigned long v) { return OSSwapBigToHostInt64(v); }
+static inline unsigned long flip(unsigned long v) { return OSSwapInt64(v); }
+static inline signed long h2n(signed long v) { return OSSwapHostToBigInt64(v); }
+static inline signed long n2h(signed long v) { return OSSwapBigToHostInt64(v); }
+static inline signed long flip(signed long v) { return OSSwapInt64(v); }
+#else
+static inline unsigned long h2n(unsigned long v)	{ return htonl(v); }
+static inline unsigned long n2h(unsigned long v)	{ return ntohl(v); }
+static inline unsigned long flip(unsigned long v)	{ return OSSwapInt32(v); }
+static inline signed long h2n(signed long v)		{ return htonl(v); }
+static inline signed long n2h(signed long v)		{ return ntohl(v); }
+static inline signed long flip(signed long v)		{ return OSSwapInt32(v); }
+#endif
+
+static inline unsigned long long h2n(unsigned long long v) { return OSSwapHostToBigInt64(v); }
+static inline unsigned long long n2h(unsigned long long v) { return OSSwapBigToHostInt64(v); }
+static inline unsigned long long flip(unsigned long long v) { return OSSwapInt64(v); }
+static inline long long h2n(long long v)			{ return OSSwapHostToBigInt64(v); }
+static inline long long n2h(long long v)			{ return OSSwapBigToHostInt64(v); }
+static inline long long flip(long long v)			{ return OSSwapInt64(v); }
+
+static inline unsigned int h2n(unsigned int v)		{ return htonl(v); }
+static inline unsigned int n2h(unsigned int v)		{ return ntohl(v); }
+static inline unsigned int flip(unsigned int v)		{ return OSSwapInt32(v); }
+static inline signed int h2n(int v)					{ return htonl(v); }
+static inline signed int n2h(int v)					{ return ntohl(v); }
+static inline signed int flip(int v)				{ return OSSwapInt32(v); }
+
+static inline unsigned short h2n(unsigned short v)	{ return htons(v); }
+static inline unsigned short n2h(unsigned short v)	{ return ntohs(v); }
+static inline unsigned short flip(unsigned short v)	{ return OSSwapInt16(v); }
+static inline signed short h2n(signed short v)		{ return htons(v); }
+static inline signed short n2h(signed short v)		{ return ntohs(v); }
+static inline signed short flip(signed short v)		{ return OSSwapInt16(v); }
+
+static inline unsigned char h2n(unsigned char v)	{ return v; }
+static inline unsigned char n2h(unsigned char v)	{ return v; }
+static inline unsigned char flip(unsigned char v)	{ return v; }
+static inline signed char h2n(signed char v)		{ return v; }
+static inline signed char n2h(signed char v)		{ return v; }
+static inline signed char flip(signed char v)		{ return v; }
+
+
+//
+// Flip pointers
+//
+template <class Base>
+static inline Base *h2n(Base *p)	{ return (Base *)h2n(uintptr_t(p)); }
+
+template <class Base>
+static inline Base *n2h(Base *p)	{ return (Base *)n2h(uintptr_t(p)); }
+
+
+//
+// In-place fix operations
+//
+template <class Type>
+static inline void h2ni(Type &v)	{ v = h2n(v); }
+
+template <class Type>
+static inline void n2hi(Type &v)	{ v = n2h(v); }
+
+//
+// Endian<SomeType> keeps NBO values in memory and converts
+// during loads and stores. This presumes that you are using
+// memory blocks thare are read/written/mapped as amorphous byte
+// streams, but want to be byte-order clean using them.
+//
+// The generic definition uses h2n/n2h to flip bytes. Feel free
+// to declare specializations of Endian<T> as appropriate.
+//
+// Note well that the address of an Endian<T> is not an address-of-T,
+// and there is no conversion available.
+//
+template <class Type>
+class Endian {
+public:
+    typedef Type Value;
+    Endian() : mValue(Type(0)) { }
+    Endian(Value v) : mValue(h2n(v)) { }
+    
+    Type get ()	const			{ return n2h(mValue); }
+    operator Value () const		{ return this->get(); }
+    Endian &operator = (Value v)	{ mValue = h2n(v); return *this; }
+
+    
+private:
+    Value mValue;
+};
+
+
+}	// end namespace Security
+
+
+#endif //_H_ENDIAN