libsecurity_transform/lib/SecExternalSourceTransform.cpp

   1 /*
   2  *  SecExternalSourceTransform.cpp
   3  *  libsecurity_transform
   4  *
   5  *  Created by J Osborne on 8/17/10.
   6  *  Copyright 2010 Apple. All rights reserved.
   7  *
   8  */
   9
  10 #include "SecTransform.h"
  11 #include "SecCustomTransform.h"
  12 #include "SecExternalSourceTransform.h"
  13 #include <dispatch/dispatch.h>
  14
  15 CFStringRef external_source_name = CFSTR("com.apple.security.external_source");
  16
  17 static SecTransformInstanceBlock SecExternalSourceTransformCreateBlock(CFStringRef name, SecTransformRef newTransform, SecTransformImplementationRef ref)
  18 {
  19         return Block_copy(^{
  20                 SecTransformCustomSetAttribute(ref, kSecTransformInputAttributeName, kSecTransformMetaAttributeRequired, kCFBooleanFalse);
  21
  22                 SecTransformAttributeRef out = SecTranformCustomGetAttribute(ref, kSecTransformOutputAttributeName, kSecTransformMetaAttributeRef);
  23
  24                 SecTransformSetAttributeAction(ref, kSecTransformActionAttributeNotification, kSecTransformInputAttributeName, ^(SecTransformAttributeRef attribute, CFTypeRef value) {
  25                         SecTransformCustomSetAttribute(ref, out, kSecTransformMetaAttributeValue, value);
  26                         return (CFTypeRef)NULL;
  27                 });
  28
  29                 return (CFErrorRef)NULL;
  30         });
  31 }
  32
  33 SecTransformRef SecExternalSourceTransformCreate(CFErrorRef* error)
  34 {
  35         static dispatch_once_t once;
  36         dispatch_once(&once, ^{
  37                 SecTransformRegister(external_source_name, SecExternalSourceTransformCreateBlock, error);
  38         });
  39
  40         return SecTransformCreate(external_source_name, error);
  41 }