OSX/libsecurity_transform/lib/SecExternalSourceTransform.cpp

   1 /*
   2  * Copyright (c) 2010-2011,2014 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 #include "SecTransform.h"
  26 #include "SecCustomTransform.h"
  27 #include "SecExternalSourceTransform.h"
  28 #include <dispatch/dispatch.h>
  29
  30 CFStringRef external_source_name = CFSTR("com.apple.security.external_source");
  31
  32 static SecTransformInstanceBlock SecExternalSourceTransformCreateBlock(CFStringRef name, SecTransformRef newTransform, SecTransformImplementationRef ref)
  33 {
  34         return Block_copy(^{
  35                 SecTransformCustomSetAttribute(ref, kSecTransformInputAttributeName, kSecTransformMetaAttributeRequired, kCFBooleanFalse);
  36
  37                 SecTransformAttributeRef out = SecTranformCustomGetAttribute(ref, kSecTransformOutputAttributeName, kSecTransformMetaAttributeRef);
  38
  39                 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification, kSecTransformInputAttributeName, ^(SecTransformAttributeRef attribute, CFTypeRef value) {
  40                         SecTransformCustomSetAttribute(ref, out, kSecTransformMetaAttributeValue, value);
  41                         return (CFTypeRef)NULL;
  42                 });
  43
  44                 return (CFErrorRef)NULL;
  45         });
  46 }
  47
  48 SecTransformRef SecExternalSourceTransformCreate(CFErrorRef* error)
  49 {
  50         static dispatch_once_t once;
  51         dispatch_once(&once, ^{
  52                 SecTransformRegister(external_source_name, SecExternalSourceTransformCreateBlock, error);
  53         });
  54
  55         return SecTransformCreate(external_source_name, error);
  56 }