1 /* 2 * Copyright (C) 2019 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 <stdint.h> 20 21 #include <vector> 22 23 #include <unwindstack/Memory.h> 24 25 namespace unwindstack { 26 27 class MemoryBuffer : public Memory { 28 public: 29 // If a size is too large, assume it's likely corrupted data, and set to zero. MemoryBuffer(size_t size)30 MemoryBuffer(size_t size) : raw_(size > kMaxBufferSize ? 0 : size), offset_(0) {} MemoryBuffer(size_t size,uint64_t offset)31 MemoryBuffer(size_t size, uint64_t offset) 32 : raw_(size > kMaxBufferSize ? 0 : size), offset_(offset) {} 33 virtual ~MemoryBuffer() = default; 34 35 size_t Read(uint64_t addr, void* dst, size_t size) override; 36 37 uint8_t* GetPtr(size_t offset) override; 38 Data()39 uint8_t* Data() { return raw_.data(); } Size()40 uint64_t Size() { return raw_.size(); } 41 42 private: 43 std::vector<uint8_t> raw_; 44 uint64_t offset_; 45 46 // This class is only used for global data and a compressed .debug_frame in 47 // the library code. The limit of 10MB is way over what any valid existing 48 // globals data section is expected to be. A 50MB shared library only contains 49 // a .debug_frame that is < 100KB in size. Therefore, 10MB should be able to 50 // handle any valid large shared library with a valid large .debug_frame. 51 static constexpr size_t kMaxBufferSize = 10 * 1024 * 1024; 52 }; 53 54 } // namespace unwindstack 55