73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <atomic>
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#include <memory>
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#include <vector>
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#include <unwindstack/Memory.h>
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namespace unwindstack {
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class MemoryXz : public Memory {
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public:
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MemoryXz(Memory* memory, uint64_t addr, uint64_t size, const std::string& name);
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~MemoryXz();
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bool Init();
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size_t Size() { return size_; }
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size_t Read(uint64_t addr, void* dst, size_t size) override;
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// Methods used in tests.
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size_t MemoryUsage() { return used_; }
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size_t BlockCount() { return blocks_.size(); }
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size_t BlockSize() { return 1 << block_size_log2_; }
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private:
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static constexpr size_t kMaxCompressedSize = 1 << 30; // 1GB. Arbitrary.
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struct XzBlock {
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std::unique_ptr<uint8_t[]> decompressed_data;
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uint32_t decompressed_size;
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uint32_t compressed_offset;
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uint32_t compressed_size;
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uint16_t stream_flags;
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};
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bool ReadBlocks();
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bool Decompress(XzBlock* block);
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// Compressed input.
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Memory* compressed_memory_;
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uint64_t compressed_addr_;
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uint64_t compressed_size_;
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std::string name_;
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// Decompressed output.
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std::vector<XzBlock> blocks_;
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uint32_t used_ = 0; // Memory usage of the currently decompressed blocks.
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uint32_t size_ = 0; // Decompressed size of all blocks.
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uint32_t block_size_log2_ = 31;
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// Statistics (used only for optional debug log messages).
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static std::atomic_size_t total_used_; // Currently decompressed memory (current memory use).
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static std::atomic_size_t total_size_; // Size of mini-debug-info if it was all decompressed.
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static std::atomic_size_t total_open_; // Number of mini-debug-info files currently in use.
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};
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} // namespace unwindstack
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