1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <utils/Errors.h> 20 #include <utils/RefBase.h> 21 22 #include <stdint.h> 23 #include <vector> 24 25 namespace android { 26 namespace util { 27 28 class ProtoReader : public virtual RefBase { 29 public: 30 ProtoReader(); 31 ~ProtoReader(); 32 33 /** 34 * Returns the number of bytes written in the buffer 35 */ 36 virtual ssize_t size() const = 0; 37 38 /** 39 * Returns the size of total bytes read. 40 */ 41 virtual size_t bytesRead() const = 0; 42 43 /** 44 * Returns the current position of read pointer, if NULL is returned, it reaches 45 * end of buffer. 46 */ 47 virtual uint8_t const* readBuffer() = 0; 48 49 /** 50 * Returns the readable size in the current read buffer. 51 */ 52 virtual size_t currentToRead() = 0; 53 54 /** 55 * Returns true if next bytes is available for read. 56 */ 57 virtual bool hasNext() = 0; 58 59 /** 60 * Reads the current byte and moves pointer 1 bit. 61 */ 62 virtual uint8_t next() = 0; 63 64 /** 65 * Read varint from the reader, the reader will point to next available byte. 66 */ 67 virtual uint64_t readRawVarint() = 0; 68 69 /** 70 * Advance the read pointer. 71 */ 72 virtual void move(size_t amt) = 0; 73 }; 74 75 } // util 76 } // android 77 78
