src/flippers.cpp

   1 /*
   2  * Copyright (c) 2003-2004 Apple Computer, 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 // process - track a single client process and its belongings
  27 //
  28 #include "flippers.h"
  29 #include <security_utilities/memutils.h>
  30
  31 using namespace LowLevelMemoryUtilities;
  32
  33
  34 namespace Flippers {
  35
  36 //
  37 // The raw byte reversal flipper
  38 //
  39 void flip(void *addr, size_t size)
  40 {
  41         assert(size > 1 && (size % 2 == 0));
  42         Byte *word = reinterpret_cast<uint8 *>(addr);
  43         for (size_t n = 0; n < size/2; n++) {
  44                 Byte b = word[n];
  45                 word[n] = word[size-1-n];
  46                 word[size-1-n] = b;
  47         }
  48 }
  49
  50
  51 //
  52 // Basic flippers
  53 //
  54 void flip(uint32 &obj)          { flip(&obj, sizeof(obj)); }
  55 void flip(uint16 &obj)          { flip(&obj, sizeof(obj)); }
  56 void flip(sint32 &obj)          { flip(&obj, sizeof(obj)); }
  57 void flip(sint16 &obj)          { flip(&obj, sizeof(obj)); }
  58
  59
  60 //
  61 // Flip a context attribute. This is heavily polymorphic.
  62 //
  63 void flip(CSSM_CONTEXT_ATTRIBUTE &obj)
  64 {
  65         flip(obj.AttributeType);
  66         flip(obj.AttributeLength);
  67         switch (obj.AttributeType & CSSM_ATTRIBUTE_TYPE_MASK) {
  68         case CSSM_ATTRIBUTE_DATA_UINT32:
  69                 flip(obj.Attribute.Uint32);
  70                 break;
  71         // all other alternatives are handled by CSSM_CONTEXT_ATTRIBUTE's walker
  72         default:
  73                 break;
  74         }
  75 }
  76
  77
  78 //
  79 // Flip a CSSM_DB_ATTRIBUTE_INFO, also very polymorphic
  80 //
  81 void flip(CSSM_DB_ATTRIBUTE_INFO &obj)
  82 {
  83         bool flippedAttributeNameFormat = false;
  84         // check and see if obj is in host byte order.  If not, flip it now
  85         if (obj.AttributeNameFormat > CSSM_DB_ATTRIBUTE_NAME_AS_INTEGER)
  86         {
  87                 flip(obj.AttributeNameFormat);
  88                 flippedAttributeNameFormat = true;
  89         }
  90
  91         switch (obj.AttributeNameFormat)
  92         {
  93                 case CSSM_DB_ATTRIBUTE_NAME_AS_INTEGER:
  94                 {
  95                         flip(obj.Label.AttributeID);
  96                 }
  97                 break;
  98         }
  99
 100         flip (obj.AttributeFormat);
 101
 102         if (!flippedAttributeNameFormat)
 103         {
 104                 flip(obj.AttributeNameFormat);
 105         }
 106
 107 }
 108
 109 //
 110 // Automatically generated flippers
 111 //
 112 #include "flip_gen.cpp"
 113
 114
 115 }       // end namespace Flippers