Security-57031.1.35.tar.gz

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

diff --git a/Security/libsecurity_cdsa_utilities/lib/cssmalloc.h b/Security/libsecurity_cdsa_utilities/lib/cssmalloc.h
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+/*
+ * Copyright (c) 2000-2004,2006,2011,2014 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@
+ */
+
+
+//
+// cssmalloc - memory allocation in the CDSA world
+//
+#ifndef _H_CSSMALLOC
+#define _H_CSSMALLOC
+
+#include <security_utilities/alloc.h>
+#include <Security/cssm.h>
+#include <cstring>
+
+
+namespace Security
+{
+
+
+//
+// A POD wrapper for the memory functions structure passed around in CSSM.
+//
+class CssmMemoryFunctions : public PodWrapper<CssmMemoryFunctions, CSSM_MEMORY_FUNCS> {
+public:
+       CssmMemoryFunctions(const CSSM_MEMORY_FUNCS &funcs)
+       { *(CSSM_MEMORY_FUNCS *)this = funcs; }
+       CssmMemoryFunctions() { }
+
+       void *malloc(size_t size) const throw(std::bad_alloc);
+       void free(void *mem) const throw() { free_func(mem, AllocRef); }
+       void *realloc(void *mem, size_t size) const throw(std::bad_alloc);
+       void *calloc(uint32 count, size_t size) const throw(std::bad_alloc);
+       
+       bool operator == (const CSSM_MEMORY_FUNCS &other) const throw()
+       { return !memcmp(this, &other, sizeof(*this)); }
+};
+
+inline void *CssmMemoryFunctions::malloc(size_t size) const throw(std::bad_alloc)
+{
+       if (void *addr = malloc_func(size, AllocRef))
+               return addr;
+       throw std::bad_alloc();
+}
+
+inline void *CssmMemoryFunctions::calloc(uint32 count, size_t size) const throw(std::bad_alloc)
+{
+       if (void *addr = calloc_func(count, size, AllocRef))
+               return addr;
+       throw std::bad_alloc();
+}
+
+inline void *CssmMemoryFunctions::realloc(void *mem, size_t size) const throw(std::bad_alloc)
+{
+       if (void *addr = realloc_func(mem, size, AllocRef))
+               return addr;
+       throw std::bad_alloc();
+}
+
+
+//
+// A Allocator based on CssmMemoryFunctions
+//
+class CssmMemoryFunctionsAllocator : public Allocator {
+public:
+       CssmMemoryFunctionsAllocator(const CssmMemoryFunctions &memFuncs) : functions(memFuncs) { }
+       
+       void *malloc(size_t size) throw(std::bad_alloc);
+       void free(void *addr) throw();
+       void *realloc(void *addr, size_t size) throw(std::bad_alloc);
+       
+       operator const CssmMemoryFunctions & () const throw() { return functions; }
+
+private:
+       const CssmMemoryFunctions functions;
+};
+
+
+//
+// A MemoryFunctions object based on a Allocator.
+// Note that we don't copy the Allocator object. It needs to live (at least)
+// as long as any CssmAllocatorMemoryFunctions object based on it.
+//
+class CssmAllocatorMemoryFunctions : public CssmMemoryFunctions {
+public:
+       CssmAllocatorMemoryFunctions(Allocator &alloc);
+       CssmAllocatorMemoryFunctions() { /*IFDEBUG(*/ AllocRef = NULL /*)*/ ; } // later assignment req'd
+       
+private:
+       static void *relayMalloc(size_t size, void *ref) throw(std::bad_alloc);
+       static void relayFree(void *mem, void *ref) throw();
+       static void *relayRealloc(void *mem, size_t size, void *ref) throw(std::bad_alloc);
+       static void *relayCalloc(uint32 count, size_t size, void *ref) throw(std::bad_alloc);
+
+       static Allocator &allocator(void *ref) throw()
+       { return *reinterpret_cast<Allocator *>(ref); }
+};
+
+
+//
+// A generic helper for the unhappily ubiquitous CSSM-style
+// (count, pointer-to-array) style of arrays.
+//
+template <class Base, class Wrapper = Base>
+class CssmVector {
+public:
+    CssmVector(uint32 &cnt, Base * &vec, Allocator &alloc = Allocator::standard())
+        : count(cnt), vector(reinterpret_cast<Wrapper * &>(vec)),
+          allocator(alloc)
+    {
+        count = 0;
+        vector = NULL;
+    }
+    
+    ~CssmVector()      { allocator.free(vector); }
+        
+    uint32 &count;
+    Wrapper * &vector;
+    Allocator &allocator;
+
+public:
+    Wrapper &operator [] (uint32 ix)
+    { assert(ix < count); return vector[ix]; }
+    
+    void operator += (const Wrapper &add)
+    {
+        vector = reinterpret_cast<Wrapper *>(allocator.realloc(vector, (count + 1) * sizeof(Wrapper)));
+        //@@@???compiler bug??? vector = allocator.alloc<Wrapper>(vector, count + 1);
+        vector[count++] = add;
+    }
+};
+
+
+} // end namespace Security
+
+#endif //_H_CSSMALLOC