OSX/libsecurity_cdsa_utilities/lib/cssmalloc.cpp

   1 /*
   2  * Copyright (c) 2000-2004,2006,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24
  25 //
  26 // cssmalloc - memory allocation in the CDSA world.
  27 //
  28 // Don't eat heavily before inspecting this code.
  29 //
  30 #include <security_cdsa_utilities/cssmalloc.h>
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <os/overflow.h>
  34
  35
  36
  37 namespace Security {
  38
  39
  40 //
  41 // CssmMemoryFunctionsAllocators
  42 //
  43 void *CssmMemoryFunctionsAllocator::malloc(size_t size)
  44 { return functions.malloc(size); }
  45
  46 void CssmMemoryFunctionsAllocator::free(void *addr) _NOEXCEPT
  47 { return functions.free(addr); }
  48
  49 void *CssmMemoryFunctionsAllocator::realloc(void *addr, size_t size)
  50 { return functions.realloc(addr, size); }
  51
  52
  53 //
  54 // CssmAllocatorMemoryFunctions
  55 //
  56 CssmAllocatorMemoryFunctions::CssmAllocatorMemoryFunctions(Allocator &alloc)
  57 {
  58         AllocRef = &alloc;
  59         malloc_func = relayMalloc;
  60         free_func = relayFree;
  61         realloc_func = relayRealloc;
  62         calloc_func = relayCalloc;
  63 }
  64
  65 void *CssmAllocatorMemoryFunctions::relayMalloc(size_t size, void *ref)
  66 { return allocator(ref).malloc(size); }
  67
  68 void CssmAllocatorMemoryFunctions::relayFree(void *mem, void *ref) _NOEXCEPT
  69 { allocator(ref).free(mem); }
  70
  71 void *CssmAllocatorMemoryFunctions::relayRealloc(void *mem, size_t size, void *ref)
  72 { return allocator(ref).realloc(mem, size); }
  73
  74 void *CssmAllocatorMemoryFunctions::relayCalloc(uint32 count, size_t size, void *ref)
  75 {
  76         // Allocator doesn't have a calloc() method
  77         size_t alloc_size = 0;
  78         if (os_mul_overflow(count, size, &alloc_size)) {
  79                 return NULL;
  80         }
  81         void *mem = allocator(ref).malloc(alloc_size);
  82         memset(mem, 0, alloc_size);
  83         return mem;
  84 }
  85
  86
  87 //
  88 // CssmVector
  89 //
  90
  91
  92 }   // namespace Security