Issue #39: Added nullability annotations to remaining code.

Framework/MIKMIDI.xcodeproj/project.pbxproj

@@ -255,6 +255,8 @@
 		9DB366F71A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.h in Headers */ = {isa = PBXBuildFile; fileRef = 9DB366F41A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		9DB366F81A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.m in Sources */ = {isa = PBXBuildFile; fileRef = 9DB366F51A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.m */; };
 		9DB366F91A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.m in Sources */ = {isa = PBXBuildFile; fileRef = 9DB366F51A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.m */; };
+		9DB8CD421BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h in Headers */ = {isa = PBXBuildFile; fileRef = 9DB8CD401BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h */; };
+		9DB8CD431BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h in Headers */ = {isa = PBXBuildFile; fileRef = 9DB8CD401BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h */; };
 		9DBEBD581AAA21BE00E59734 /* MIKMIDICommand_SubclassMethods.h in Headers */ = {isa = PBXBuildFile; fileRef = 9D74EF3517A713A100BEE89F /* MIKMIDICommand_SubclassMethods.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		9DBEBD591AAA21BE00E59734 /* MIKMIDICommand_SubclassMethods.h in Headers */ = {isa = PBXBuildFile; fileRef = 9D74EF3517A713A100BEE89F /* MIKMIDICommand_SubclassMethods.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		9DBEBD5A1AAA21C400E59734 /* MIKMIDIEvent_SubclassMethods.h in Headers */ = {isa = PBXBuildFile; fileRef = 839D932D19C3A2C9007589C3 /* MIKMIDIEvent_SubclassMethods.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -446,6 +448,7 @@
 		9DB366EF1A964C55001D1CF3 /* MIKMIDISynthesizer.m */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 4; lastKnownFileType = sourcecode.c.objc; path = MIKMIDISynthesizer.m; sourceTree = "<group>"; tabWidth = 4; usesTabs = 1; wrapsLines = 1; };
 		9DB366F41A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MIKMIDISynthesizerInstrument.h; sourceTree = "<group>"; };
 		9DB366F51A964D4A001D1CF3 /* MIKMIDISynthesizerInstrument.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = MIKMIDISynthesizerInstrument.m; sourceTree = "<group>"; };
+		9DB8CD401BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MIKMIDIMetaEvent_SubclassMethods.h; sourceTree = "<group>"; };
 		9DBEBD5C1AAA27D100E59734 /* module.modulemap */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = "sourcecode.module-map"; path = module.modulemap; sourceTree = SOURCE_ROOT; };
 		9DBEBD651AAA303700E59734 /* MIKMIDIChannelPressureEvent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MIKMIDIChannelPressureEvent.h; sourceTree = "<group>"; };
 		9DBEBD661AAA303700E59734 /* MIKMIDIChannelPressureEvent.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = MIKMIDIChannelPressureEvent.m; sourceTree = "<group>"; };
@@ -700,6 +703,7 @@
 			isa = PBXGroup;
 			children = (
 				839D933B19C3A2F5007589C3 /* MIKMIDIMetaEvent.h */,
+				9DB8CD401BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h */,
 				839D933C19C3A2F5007589C3 /* MIKMIDIMetaEvent.m */,
 				839D933719C3A2F5007589C3 /* MIKMIDIMetaCopyrightEvent.h */,
 				839D933819C3A2F5007589C3 /* MIKMIDIMetaCopyrightEvent.m */,
@@ -861,6 +865,7 @@
 				9D74EF7117A713A100BEE89F /* MIKMIDIEndpoint.h in Headers */,
 				83FB360E1B42D58000F91DCD /* MIKMIDISequence+MIKMIDIPrivate.h in Headers */,
 				9D74EF7317A713A100BEE89F /* MIKMIDIEntity.h in Headers */,
+				9DB8CD421BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h in Headers */,
 				9D74EF7517A713A100BEE89F /* MIKMIDIErrors.h in Headers */,
 				9D74EF7717A713A100BEE89F /* MIKMIDIInputPort.h in Headers */,
 				9D74EF7917A713A100BEE89F /* MIKMIDIMapping.h in Headers */,
@@ -948,6 +953,7 @@
 				9DAF8B631A7B008A00F46528 /* MIKMIDINoteOnCommand.h in Headers */,
 				9D84951D1AA7678700C52475 /* MIKMIDIProgramChangeEvent.h in Headers */,
 				9DAF8B5E1A7B007300F46528 /* MIKMIDIDestinationEndpoint.h in Headers */,
+				9DB8CD431BF266FE00F6388D /* MIKMIDIMetaEvent_SubclassMethods.h in Headers */,
 				9D3781561AA407A7007A61BE /* MIKMIDIResponder.h in Headers */,
 				9DAF8B7B1A7B00A700F46528 /* MIKMIDIPlayer.h in Headers */,
 				9DAF8B781A7B00A700F46528 /* MIKMIDIMetaTimeSignatureEvent.h in Headers */,

Source/MIKMIDIChannelEvent.h

@@ -7,6 +7,9 @@
 //
 
 #import <MIKMIDI/MIKMIDIEvent.h>
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 @interface MIKMIDIChannelEvent : MIKMIDIEvent
 
@@ -18,7 +21,7 @@
  *
  *  @return A new instance of a subclass of MIKMIDIChannelEvent, or nil if there is an error.
  */
-+ (instancetype)channelEventWithTimeStamp:(MusicTimeStamp)timeStamp message:(MIDIChannelMessage)message;
++ (nullable instancetype)channelEventWithTimeStamp:(MusicTimeStamp)timeStamp message:(MIDIChannelMessage)message;
 
 // Properties
 
@@ -45,21 +48,27 @@
 @interface MIKMutableMIDIChannelEvent : MIKMIDIChannelEvent
 
 @property (nonatomic, readwrite) MusicTimeStamp timeStamp;
-@property (nonatomic, strong, readwrite) NSMutableData *data;
+@property (nonatomic, strong, readwrite, null_resettable) NSMutableData *data;
 @property (nonatomic, readwrite) UInt8 channel;
 @property (nonatomic, readwrite) UInt8 dataByte1;
 @property (nonatomic, readwrite) UInt8 dataByte2;
 
 @end
 
+NS_ASSUME_NONNULL_END
+
 #pragma mark -
 
 #import <MIKMIDI/MIKMIDICommand.h>
 
 @class MIKMIDIClock;
 
+NS_ASSUME_NONNULL_BEGIN
+
 @interface MIKMIDICommand (MIKMIDIChannelEventToCommands)
 
-+ (instancetype)commandFromChannelEvent:(MIKMIDIChannelEvent *)event clock:(MIKMIDIClock *)clock;
++ (nullable instancetype)commandFromChannelEvent:(MIKMIDIChannelEvent *)event clock:(MIKMIDIClock *)clock;
+
+@end
 
-@end
+NS_ASSUME_NONNULL_END

Source/MIKMIDIChannelPressureEvent.h

@@ -7,6 +7,9 @@
 //
 
 #import "MIKMIDIChannelEvent.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *  A channel pressure (aftertouch) event.
@@ -32,9 +35,11 @@
 @property (nonatomic, readwrite) UInt8 pressure;
 
 @property (nonatomic, readwrite) MusicTimeStamp timeStamp;
-@property (nonatomic, strong, readwrite) NSMutableData *data;
+@property (nonatomic, strong, readwrite, null_resettable) NSMutableData *data;
 @property (nonatomic, readwrite) UInt8 channel;
 @property (nonatomic, readwrite) UInt8 dataByte1;
 @property (nonatomic, readwrite) UInt8 dataByte2;
 
-@end
+@end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIChannelVoiceCommand.h

@@ -7,6 +7,9 @@
 //
 
 #import "MIKMIDICommand.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *  MIKMIDIChannelVoiceCommand is used to represent MIDI messages whose type is
@@ -46,6 +49,8 @@
 @property (nonatomic, readwrite) UInt8 dataByte2;
 
 @property (nonatomic, readwrite) MIDITimeStamp midiTimestamp;
-@property (nonatomic, copy, readwrite) NSData *data;
+@property (nonatomic, copy, readwrite, null_resettable) NSData *data;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIChannelVoiceCommand_SubclassMethods.h

@@ -8,9 +8,14 @@
 
 #import "MIKMIDIChannelVoiceCommand.h"
 #import "MIKMIDICommand_SubclassMethods.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 @interface MIKMIDIChannelVoiceCommand ()
 
 @property (nonatomic, readwrite) NSUInteger value;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIClientDestinationEndpoint.h

@@ -7,9 +7,12 @@
 //
 
 #import "MIKMIDIDestinationEndpoint.h"
+#import "MIKMIDICompilerCompatibility.h"
 
 @class MIKMIDIClientDestinationEndpoint;
 
+NS_ASSUME_NONNULL_BEGIN
+
 typedef void(^MIKMIDIClientDestinationEndpointEventHandler)(MIKMIDIClientDestinationEndpoint *destination, NSArray *commands);
 
 /**
@@ -37,11 +40,13 @@ typedef void(^MIKMIDIClientDestinationEndpointEventHandler)(MIKMIDIClientDestina
  *
  *  @return An instance of MIKMIDIClientDestinationEndpoint, or nil if an error occurs.
  */
-- (instancetype)initWithName:(NSString *)name receivedMessagesHandler:(MIKMIDIClientDestinationEndpointEventHandler)handler;
+- (nullable instancetype)initWithName:(NSString *)name receivedMessagesHandler:(nullable MIKMIDIClientDestinationEndpointEventHandler)handler;
 
 /**
  *  A block to be called when the receiver receives new incoming MIDI messages.
  */
-@property (nonatomic, strong) MIKMIDIClientDestinationEndpointEventHandler receivedMessagesHandler;
+@property (nonatomic, strong, nullable) MIKMIDIClientDestinationEndpointEventHandler receivedMessagesHandler;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIClientSourceEndpoint.h

@@ -6,6 +6,9 @@
 //
 
 #import "MIKMIDISourceEndpoint.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *	MIKMIDIClientSourceEndpoint represents a virtual endpoint created by your application to send MIDI
@@ -27,7 +30,7 @@
  *
  *  @return An instance of MIKMIDIClientSourceEndpoint, or nil if an error occurs.
  */
-- (instancetype)initWithName:(NSString*)name;
+- (nullable instancetype)initWithName:(NSString *)name;
 
 /**
  *  Used to send MIDI messages/commands from your application to a MIDI output endpoint.
@@ -41,3 +44,5 @@
 - (BOOL)sendCommands:(NSArray *)commands error:(NSError **)error;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIClock.h

@@ -8,6 +8,7 @@
 
 #import <Foundation/Foundation.h>
 #import <AudioToolbox/AudioToolbox.h>
+#import "MIKMIDICompilerCompatibility.h"
 
 /**
  *  Returns the number of MIDITimeStamps that would occur during a specified time interval.
@@ -25,6 +26,7 @@ Float64 MIKMIDIClockMIDITimeStampsPerTimeInterval(NSTimeInterval timeInterval);
  */
 Float64 MIKMIDIClockSecondsPerMIDITimeStamp();
 
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *  MIKMIDIClock provides the number of seconds per MIDITimeStamp, as well as the
@@ -213,6 +215,6 @@ Float64 MIKMIDIClockSecondsPerMIDITimeStamp();
  */
 + (Float64)midiTimeStampsPerTimeInterval:(NSTimeInterval)timeInterval DEPRECATED_ATTRIBUTE;
 
-
 @end
 
+NS_ASSUME_NONNULL_END

Source/MIKMIDICommand.h

@@ -8,6 +8,7 @@
 
 #import <Foundation/Foundation.h>
 #import <CoreMIDI/CoreMIDI.h>
+#import "MIKMIDICompilerCompatibility.h"
 
 /**
  *  Types of MIDI messages. These values correspond directly to the MIDI command type values
@@ -56,6 +57,8 @@ typedef NS_ENUM(NSUInteger, MIKMIDICommandType) {
 
 @class MIKMIDIMappingItem;
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  *  In MIKMIDI, MIDI messages are objects. Specifically, they are instances of MIKMIDICommand or one of its
  *  subclasses. MIKMIDICommand's subclasses each represent a specific type of MIDI message, for example,
@@ -193,14 +196,14 @@ typedef NS_ENUM(NSUInteger, MIKMIDICommandType) {
 /**
  *  The raw data that makes up the receiver.
  */
-@property (nonatomic, copy, readonly) NSData *data;
+@property (nonatomic, copy, readonly, null_resettable) NSData *data;
 
 /**
  *  Optional mapping item used to route the command. This must be set by client code that handles
  *  receiving MIDI commands. Allows responders to understand how a command was mapped, especially
  *  useful to determine interaction type so that responders can interpret the command correctly.
  */
-@property (nonatomic, strong) MIKMIDIMappingItem *mappingItem;
+@property (nonatomic, strong, nullable) MIKMIDIMappingItem *mappingItem;
 
 @end
 
@@ -225,11 +228,12 @@ typedef NS_ENUM(NSUInteger, MIKMIDICommandType) {
  *  transfered to the caller which becomes responsible for freeing the allocated memory.
  *  Used by MIKMIDI when sending commands. Typically, this is not needed by clients of MIKMIDI.
  *
- *  @param outPacketList   A pointer pointer to a MIDIPacketList structure which will point to the created MIDIPacketList
+ *  @param outPacketList   A pointer to a pointer to a MIDIPacketList structure which will point to the created MIDIPacketList
  *                         upon success.
  *  @param commands        An array of MIKMIDICommand instances.
  *
  *  @return YES if creating the packet list was successful, NO if an error occurred.
  */
-BOOL MIKCreateMIDIPacketListFromCommands(MIDIPacketList **outPacketList, NSArray *commands);
+BOOL MIKCreateMIDIPacketListFromCommands(MIDIPacketList * _Nonnull * _Nonnull outPacketList, NSArray *commands);
 
+NS_ASSUME_NONNULL_END

Source/MIKMIDICommand.m

@@ -298,7 +298,7 @@ - (void)setData:(NSData *)data
 {
 	if (![[self class] isMutable]) return MIKMIDI_RAISE_MUTATION_ATTEMPT_EXCEPTION;
 
-	self.internalData = [data mutableCopy];
+	self.internalData = data ? [data mutableCopy] : [NSMutableData data];
 }
 
 @end

Source/MIKMIDICommandScheduler.h

@@ -7,7 +7,9 @@
 //
 
 #import <Foundation/Foundation.h>
+#import "MIKMIDICompilerCompatibility.h"
 
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *	Objects that conform to this protocol can be used as a destination for MIDI commands to
@@ -20,3 +22,5 @@
 - (void)scheduleMIDICommands:(NSArray *)commands;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDICommandThrottler.h

@@ -7,14 +7,16 @@
 //
 
 #import <Foundation/Foundation.h>
+#import "MIKMIDICompilerCompatibility.h"
 
 @class MIKMIDIChannelVoiceCommand;
 
+NS_ASSUME_NONNULL_BEGIN
+
 /**
  *  MIKMIDICommandThrottler is a simple utility class useful for throttling e.g. jog wheel/turntable controls, 
  *  which otherwise send many messages per revolution.
  */
-
 @interface MIKMIDICommandThrottler : NSObject
 
 /**
@@ -35,3 +37,5 @@
 - (void)resetThrottlingCountForCommand:(MIKMIDIChannelVoiceCommand *)command;
 
 @end
+
+NS_ASSUME_NONNULL_END

Source/MIKMIDIControlChangeCommand.h

@@ -7,6 +7,9 @@
 //
 
 #import "MIKMIDIChannelVoiceCommand.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *  A MIDI control change message.
@@ -33,7 +36,7 @@
  *  @return A new, single MIKMIDIControlChangeCommand instance containing 14-bit value data, and whose 
  *  fourteenBitCommand property is set to YES.
  */
-+ (instancetype)commandByCoalescingMSBCommand:(MIKMIDIControlChangeCommand *)msbCommand andLSBCommand:(MIKMIDIControlChangeCommand *)lsbCommand;
++ (nullable instancetype)commandByCoalescingMSBCommand:(MIKMIDIControlChangeCommand *)msbCommand andLSBCommand:(MIKMIDIControlChangeCommand *)lsbCommand;
 
 /**
  *  The MIDI control number for the command.
@@ -101,6 +104,8 @@
 @property (nonatomic, readwrite) UInt8 dataByte2;
 
 @property (nonatomic, readwrite) MIDITimeStamp midiTimestamp;
-@property (nonatomic, copy, readwrite) NSData *data;
+@property (nonatomic, copy, readwrite, null_resettable) NSData *data;
+
+@end
 
-@end
+NS_ASSUME_NONNULL_END

Source/MIKMIDIControlChangeEvent.h

@@ -7,6 +7,9 @@
 //
 
 #import "MIKMIDIChannelEvent.h"
+#import "MIKMIDICompilerCompatibility.h"
+
+NS_ASSUME_NONNULL_BEGIN
 
 /**
  *  Control change events are typically sent when a controller value changes. 
@@ -40,9 +43,11 @@
 @property (nonatomic, readwrite) NSUInteger controllerValue;
 
 @property (nonatomic, readwrite) MusicTimeStamp timeStamp;
-@property (nonatomic, strong, readwrite) NSMutableData *data;
+@property (nonatomic, strong, readwrite, null_resettable) NSMutableData *data;
 @property (nonatomic, readwrite) UInt8 channel;
 @property (nonatomic, readwrite) UInt8 dataByte1;
 @property (nonatomic, readwrite) UInt8 dataByte2;
 
-@end
+@end
+
+NS_ASSUME_NONNULL_END