System/Library/PrivateFrameworks/TextToSpeechBundleSupport.framework
TTSUTF8Offset.h
@interface TTSUTF8Offset : NSObject
@property (nonatomic) long long cStringOffset;
@property (nonatomic) long long actualPos;
@property (nonatomic) long long actualLength;
@property (nonatomic) long long lengthDifference;
- (id)description;
@end