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diff --git a/Firebase/Messaging/FIRMessagingUtilities.h b/Firebase/Messaging/FIRMessagingUtilities.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+typedef NS_ENUM(int8_t, FIRMessagingProtoTag) {
+  kFIRMessagingProtoTagInvalid = -1,
+  kFIRMessagingProtoTagHeartbeatPing = 0,
+  kFIRMessagingProtoTagHeartbeatAck = 1,
+  kFIRMessagingProtoTagLoginRequest = 2,
+  kFIRMessagingProtoTagLoginResponse = 3,
+  kFIRMessagingProtoTagClose = 4,
+  kFIRMessagingProtoTagIqStanza = 7,
+  kFIRMessagingProtoTagDataMessageStanza = 8,
+};
+
+@class GPBMessage;
+
+#pragma mark - Protocol Buffers
+
+FOUNDATION_EXPORT FIRMessagingProtoTag FIRMessagingGetTagForProto(GPBMessage *protoClass);
+FOUNDATION_EXPORT Class FIRMessagingGetClassForTag(FIRMessagingProtoTag tag);
+
+#pragma mark - MCS
+
+FOUNDATION_EXPORT NSString *FIRMessagingGetRmq2Id(GPBMessage *proto);
+FOUNDATION_EXPORT void FIRMessagingSetRmq2Id(GPBMessage *proto, NSString *pID);
+FOUNDATION_EXPORT int FIRMessagingGetLastStreamId(GPBMessage *proto);
+FOUNDATION_EXPORT void FIRMessagingSetLastStreamId(GPBMessage *proto, int sid);
+
+#pragma mark - Time
+
+FOUNDATION_EXPORT int64_t FIRMessagingCurrentTimestampInSeconds();
+FOUNDATION_EXPORT int64_t FIRMessagingCurrentTimestampInMilliseconds();
+
+#pragma mark - App Info
+
+FOUNDATION_EXPORT NSString *FIRMessagingCurrentAppVersion();
+FOUNDATION_EXPORT NSString *FIRMessagingAppIdentifier();
+
+FOUNDATION_EXPORT uint64_t FIRMessagingGetFreeDiskSpaceInMB();