OSX/libsecurity_utilities/lib/seccfobject.cpp

   1 /*
   2  * Copyright (c) 2000-2004,2011-2014 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 #include <security_utilities/seccfobject.h>
  25 #include <security_utilities/cfclass.h>
  26 #include <security_utilities/errors.h>
  27 #include <security_utilities/debugging.h>
  28
  29 #include <list>
  30 #include <security_utilities/globalizer.h>
  31 #include <stdatomic.h>
  32
  33 SecPointerBase::SecPointerBase(const SecPointerBase& p)
  34 {
  35         if (p.ptr)
  36         {
  37                 CFRetain(p.ptr->operator CFTypeRef());
  38         }
  39         ptr = p.ptr;
  40 }
  41
  42
  43 SecPointerBase::SecPointerBase(SecCFObject *p)
  44 {
  45         if (p && !p->isNew())
  46         {
  47                 CFRetain(p->operator CFTypeRef());
  48         }
  49         ptr = p;
  50 }
  51
  52
  53
  54 SecPointerBase::~SecPointerBase()
  55 {
  56         if (ptr)
  57         {
  58                 CFRelease(ptr->operator CFTypeRef());
  59         }
  60 }
  61
  62
  63
  64 SecPointerBase& SecPointerBase::operator = (const SecPointerBase& p)
  65 {
  66         if (p.ptr)
  67         {
  68                 CFTypeRef tr = p.ptr->operator CFTypeRef();
  69                 CFRetain(tr);
  70         }
  71         if (ptr)
  72         {
  73                 CFRelease(ptr->operator CFTypeRef());
  74         }
  75         ptr = p.ptr;
  76         return *this;
  77 }
  78
  79
  80
  81 void SecPointerBase::assign(SecCFObject * p)
  82 {
  83         if (p && !p->isNew())
  84         {
  85                 CFRetain(p->operator CFTypeRef());
  86         }
  87         if (ptr)
  88         {
  89                 CFRelease(ptr->operator CFTypeRef());
  90         }
  91         ptr = p;
  92 }
  93
  94
  95
  96 void SecPointerBase::copy(SecCFObject * p)
  97 {
  98         if (ptr)
  99         {
 100                 CFRelease(ptr->operator CFTypeRef());
 101         }
 102
 103         ptr = p;
 104 }
 105
 106
 107
 108 //
 109 // SecCFObject
 110 //
 111 SecCFObject *
 112 SecCFObject::optional(CFTypeRef cfTypeRef) throw()
 113 {
 114         if (!cfTypeRef)
 115                 return NULL;
 116
 117         return const_cast<SecCFObject *>(reinterpret_cast<const SecCFObject *>(reinterpret_cast<const uint8_t *>(cfTypeRef) + kAlignedRuntimeSize));
 118 }
 119
 120 SecCFObject *
 121 SecCFObject::required(CFTypeRef cfTypeRef, OSStatus error)
 122 {
 123         SecCFObject *object = optional(cfTypeRef);
 124         if (!object)
 125                 MacOSError::throwMe(error);
 126
 127         return object;
 128 }
 129
 130 void *
 131 SecCFObject::allocate(size_t size, const CFClass &cfclass) throw(std::bad_alloc)
 132 {
 133         CFTypeRef p = _CFRuntimeCreateInstance(NULL, cfclass.typeID,
 134                 size + kAlignedRuntimeSize - sizeof(CFRuntimeBase), NULL);
 135         if (p == NULL)
 136                 throw std::bad_alloc();
 137
 138         atomic_flag_clear(&((SecRuntimeBase*) p)->isOld);
 139
 140         void *q = ((u_int8_t*) p) + kAlignedRuntimeSize;
 141
 142         return q;
 143 }
 144
 145 void
 146 SecCFObject::operator delete(void *object) throw()
 147 {
 148         CFTypeRef cfType = reinterpret_cast<CFTypeRef>(reinterpret_cast<const uint8_t *>(object) - kAlignedRuntimeSize);
 149     if (CF_IS_COLLECTABLE(cfType))
 150     {
 151         return;
 152     }
 153
 154     CFAllocatorRef allocator = CFGetAllocator(cfType);
 155     CFAllocatorDeallocate(allocator, (void*) cfType);
 156 }
 157
 158 SecCFObject::SecCFObject()
 159 {
 160     mRetainCount = 1;
 161     mRetainSpinLock = OS_SPINLOCK_INIT;
 162 }
 163
 164 uint32_t SecCFObject::updateRetainCount(intptr_t direction, uint32_t *oldCount)
 165 {
 166     OSSpinLockLock(&mRetainSpinLock);
 167
 168     if (oldCount != NULL)
 169     {
 170         *oldCount = mRetainCount;
 171     }
 172
 173     if (direction != -1 || mRetainCount != 0)
 174     {
 175         // if we are decrementing
 176         if (direction == -1 || UINT32_MAX != mRetainCount)
 177         {
 178             mRetainCount += direction;
 179         }
 180     }
 181
 182     uint32_t result = mRetainCount;
 183
 184     OSSpinLockUnlock(&mRetainSpinLock);
 185
 186     return result;
 187 }
 188
 189
 190
 191 SecCFObject::~SecCFObject()
 192 {
 193         //SECURITY_DEBUG_SEC_DESTROY(this);
 194 }
 195
 196 bool
 197 SecCFObject::equal(SecCFObject &other)
 198 {
 199         return this == &other;
 200 }
 201
 202 CFHashCode
 203 SecCFObject::hash()
 204 {
 205         return CFHashCode(this);
 206 }
 207
 208 CFStringRef
 209 SecCFObject::copyFormattingDesc(CFDictionaryRef dict)
 210 {
 211         return NULL;
 212 }
 213
 214 CFStringRef
 215 SecCFObject::copyDebugDesc()
 216 {
 217         return NULL;
 218 }
 219
 220 CFTypeRef
 221 SecCFObject::handle(bool retain) throw()
 222 {
 223         CFTypeRef cfType = *this;
 224         if (retain && !isNew()) CFRetain(cfType);
 225         return cfType;
 226 }
 227
 228
 229
 230 void
 231 SecCFObject::aboutToDestruct()
 232 {
 233 }
 234
 235
 236
 237 Mutex*
 238 SecCFObject::getMutexForObject() const
 239 {
 240         return NULL; // we only worry about descendants of KeychainImpl and ItemImpl
 241 }
 242
 243
 244
 245 bool SecCFObject::mayDelete()
 246 {
 247     return true;
 248 }