Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_cdsa_utilities / lib / constdata.h

diff --git a/Security/libsecurity_cdsa_utilities/lib/constdata.h b/Security/libsecurity_cdsa_utilities/lib/constdata.h
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+/*
+ * Copyright (c) 2000-2001,2003-2004,2006,2011,2014 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@
+ */
+
+
+//
+// constdata - shared constant binary data objects
+//
+#ifndef _H_CONSTDATA
+#define _H_CONSTDATA
+
+#include <security_utilities/utilities.h>
+#include <security_utilities/refcount.h>
+
+
+namespace Security {
+
+
+//
+// ConstData represents a contiguous, binary blob of constant data.
+// Assignment is by sharing (thus cheap).
+// ConstData is a (constant) Dataoid type.
+//
+class ConstData {    
+private:
+    class Blob : public RefCount {
+    public:
+        Blob() : mData(NULL), mSize(0) { }
+        Blob(const void *base, size_t size, bool takeOwnership = false);
+        ~Blob()                { delete[] reinterpret_cast<const char *>(mData); }
+    
+        const void *data() const       { return mData; }
+        size_t length() const          { return mSize; }
+    
+    private:
+        const void *mData;
+        size_t mSize;
+    };
+    
+public:
+    ConstData() { }            //@@@ use a nullBlob?
+    ConstData(const void *base, size_t size, bool takeOwnership = false)
+        : mBlob(new Blob(base, size, takeOwnership)) { }
+        
+    template <class T>
+    static ConstData wrap(const T &obj, bool takeOwnership)
+    { return ConstData(&obj, sizeof(obj), takeOwnership); }
+    
+public:
+    const void *data() const   { return mBlob ? mBlob->data() : NULL; }
+    size_t length() const              { return mBlob ? mBlob->length() : 0; }
+    
+    operator bool() const              { return mBlob; }
+    bool operator !() const            { return !mBlob; }
+
+    template <class T> operator const T *() const
+    { return reinterpret_cast<const T *>(data()); }
+    
+    template <class T> const T &as() const
+    { return *static_cast<const T *>(reinterpret_cast<const T *>(data())); }
+    
+private:
+    RefPointer<Blob> mBlob;
+};
+
+
+}      // end namespace Security
+
+
+#endif //_H_CONSTDATA