[XMPPRosterCoreDataStorage] Fix photo attribute to support both UIIma…

…ge and NSImage.

Utilities/RFImageToDataTransformer.h

@@ -0,0 +1,19 @@
+
+/*
+     File: RFImageToDataTransformer.h
+ Abstract: A value transformer, which transforms a UIImage or NSImage object into an NSData object.
+ 
+ Based on Apple's UIImageToDataTransformer
+ 
+ Copyright (C) 2010 Apple Inc. All Rights Reserved.
+ Copyright (C) 2011 RF.com All Rights Reserved.
+ */
+
+#import <Foundation/Foundation.h>
+
+
+@interface RFImageToDataTransformer : NSValueTransformer {
+
+}
+
+@end

Utilities/RFImageToDataTransformer.m

@@ -0,0 +1,48 @@
+
+/*
+     File: RFImageToDataTransformer.m
+ Abstract: A value transformer, which transforms a UIImage or NSImage object into an NSData object.
+ 
+ Based on Apple's UIImageToDataTransformer
+ 
+ Copyright (C) 2010 Apple Inc. All Rights Reserved.
+ Copyright (C) 2011 RF.com All Rights Reserved.
+ */
+
+#import "RFImageToDataTransformer.h"
+
+#if TARGET_OS_IPHONE
+#import <UIKit/UIKit.h>
+#else
+
+#endif
+
+
+@implementation RFImageToDataTransformer
+
++ (BOOL)allowsReverseTransformation {
+	return YES;
+}
+
++ (Class)transformedValueClass {
+	return [NSData class];
+}
+
+- (id)transformedValue:(id)value {
+#if TARGET_OS_IPHONE
+  return UIImagePNGRepresentation(value);
+#else
+  return [(NSImage *)value TIFFRepresentation];
+#endif
+}
+
+- (id)reverseTransformedValue:(id)value {
+#if TARGET_OS_IPHONE
+	return [[[UIImage alloc] initWithData:value] autorelease];
+#else
+  return [[[NSImage alloc] initWithData:value] autorelease];
+#endif
+}
+
+@end
+