--- /dev/null
+/*
+ * 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>
+
+@interface FIRMessagingCodedInputStream : NSObject
+
+@property(nonatomic, readonly, assign) size_t offset;
+
+- (instancetype)initWithData:(NSData *)data;
+- (BOOL)readTag:(int8_t *)tag;
+- (BOOL)readLength:(int32_t *)length;
+- (NSData *)readDataWithLength:(uint32_t)length;
+
+@end