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/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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.
*/
#ifndef _LIBUNWINDSTACK_MEMORY_XZ_H
#define _LIBUNWINDSTACK_MEMORY_XZ_H
#include <atomic>
#include <memory>
#include <vector>
#include <unwindstack/Memory.h>
namespace unwindstack {
class MemoryXz : public Memory {
public:
MemoryXz(Memory* memory, uint64_t addr, uint64_t size, const std::string& name);
~MemoryXz();
bool Init();
size_t Size() { return size_; }
size_t Read(uint64_t addr, void* dst, size_t size) override;
// Methods used in tests.
size_t MemoryUsage() { return used_; }
size_t BlockCount() { return blocks_.size(); }
size_t BlockSize() { return 1 << block_size_log2_; }
private:
static constexpr size_t kMaxCompressedSize = 1 << 30; // 1GB. Arbitrary.
struct XzBlock {
std::unique_ptr<uint8_t[]> decompressed_data;
uint32_t decompressed_size;
uint32_t compressed_offset;
uint32_t compressed_size;
uint16_t stream_flags;
};
bool ReadBlocks();
bool Decompress(XzBlock* block);
// Compressed input.
Memory* compressed_memory_;
uint64_t compressed_addr_;
uint64_t compressed_size_;
std::string name_;
// Decompressed output.
std::vector<XzBlock> blocks_;
uint32_t used_ = 0; // Memory usage of the currently decompressed blocks.
uint32_t size_ = 0; // Decompressed size of all blocks.
uint32_t block_size_log2_ = 31;
// Statistics (used only for optional debug log messages).
static std::atomic_size_t total_used_; // Currently decompressed memory (current memory use).
static std::atomic_size_t total_size_; // Size of mini-debug-info if it was all decompressed.
static std::atomic_size_t total_open_; // Number of mini-debug-info files currently in use.
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_MEMORY_XZ_H
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