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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <stdint.h>
#include <vector>
#include <unwindstack/Memory.h>
namespace unwindstack {
class MemoryBuffer : public Memory {
public:
// If a size is too large, assume it's likely corrupted data, and set to zero.
MemoryBuffer(size_t size) : raw_(size > kMaxBufferSize ? 0 : size), offset_(0) {}
MemoryBuffer(size_t size, uint64_t offset)
: raw_(size > kMaxBufferSize ? 0 : size), offset_(offset) {}
virtual ~MemoryBuffer() = default;
size_t Read(uint64_t addr, void* dst, size_t size) override;
uint8_t* GetPtr(size_t offset) override;
uint64_t Size() { return raw_.size(); }
private:
std::vector<uint8_t> raw_;
uint64_t offset_;
// This class is only used for global data and a compressed .debug_frame in
// the library code. The limit of 10MB is way over what any valid existing
// globals data section is expected to be. A 50MB shared library only contains
// a .debug_frame that is < 100KB in size. Therefore, 10MB should be able to
// handle any valid large shared library with a valid large .debug_frame.
static constexpr size_t kMaxBufferSize = 10 * 1024 * 1024;
};
} // namespace unwindstack
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