1 /* 2 * Copyright (C) 2021 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 #ifndef _LIBUNWINDSTACK_MEMORY_XZ_H 18 #define _LIBUNWINDSTACK_MEMORY_XZ_H 19 20 #include <atomic> 21 #include <memory> 22 #include <vector> 23 24 #include <unwindstack/Memory.h> 25 26 namespace unwindstack { 27 28 class MemoryXz : public Memory { 29 public: 30 MemoryXz(Memory* memory, uint64_t addr, uint64_t size, const std::string& name); 31 ~MemoryXz(); 32 33 bool Init(); Size()34 size_t Size() { return size_; } 35 size_t Read(uint64_t addr, void* dst, size_t size) override; 36 37 // Methods used in tests. MemoryUsage()38 size_t MemoryUsage() { return used_; } BlockCount()39 size_t BlockCount() { return blocks_.size(); } BlockSize()40 size_t BlockSize() { return 1 << block_size_log2_; } 41 42 private: 43 static constexpr size_t kMaxCompressedSize = 1 << 30; // 1GB. Arbitrary. 44 45 struct XzBlock { 46 std::unique_ptr<uint8_t[]> decompressed_data; 47 uint32_t decompressed_size; 48 uint32_t compressed_offset; 49 uint32_t compressed_size; 50 uint16_t stream_flags; 51 }; 52 bool ReadBlocks(); 53 bool Decompress(XzBlock* block); 54 55 // Compressed input. 56 Memory* compressed_memory_; 57 uint64_t compressed_addr_; 58 uint64_t compressed_size_; 59 std::string name_; 60 61 // Decompressed output. 62 std::vector<XzBlock> blocks_; 63 uint32_t used_ = 0; // Memory usage of the currently decompressed blocks. 64 uint32_t size_ = 0; // Decompressed size of all blocks. 65 uint32_t block_size_log2_ = 31; 66 67 // Statistics (used only for optional debug log messages). 68 static std::atomic_size_t total_used_; // Currently decompressed memory (current memory use). 69 static std::atomic_size_t total_size_; // Size of mini-debug-info if it was all decompressed. 70 static std::atomic_size_t total_open_; // Number of mini-debug-info files currently in use. 71 }; 72 73 } // namespace unwindstack 74 75 #endif // _LIBUNWINDSTACK_MEMORY_XZ_H 76