| // Copyright 2020 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_STORAGE_FVM_METADATA_BUFFER_H_ |
| #define SRC_STORAGE_FVM_METADATA_BUFFER_H_ |
| |
| #include <lib/zx/status.h> |
| #include <zircon/types.h> |
| |
| #include <limits> |
| |
| #include "src/storage/fvm/format.h" |
| |
| namespace fvm { |
| |
| // MetadataBuffer is an interface for a buffer that contains FVM metadata. |
| class MetadataBuffer { |
| public: |
| virtual ~MetadataBuffer() = default; |
| |
| // Creates an uninitialized |MetadataBuffer| which has capacity for at least |size| bytes. |
| // This is intentionally non-static so inheriting classes can override it to return the |
| // appropriate type. In general the instance's fields/methods will not be accessed. |
| virtual std::unique_ptr<MetadataBuffer> Create(size_t size) const = 0; |
| |
| virtual void* data() const = 0; |
| virtual size_t size() const = 0; |
| }; |
| |
| // HeapMetadataBuffer is an instance of |MetadataBuffer| backed by a heap-allocated buffer. |
| class HeapMetadataBuffer : public MetadataBuffer { |
| public: |
| HeapMetadataBuffer(std::unique_ptr<uint8_t[]> buffer, size_t size); |
| ~HeapMetadataBuffer() override; |
| |
| std::unique_ptr<MetadataBuffer> Create(size_t size) const override; |
| |
| void* data() const override { return buffer_.get(); } |
| size_t size() const override { return size_; } |
| |
| private: |
| std::unique_ptr<uint8_t[]> buffer_; |
| size_t size_; |
| }; |
| |
| } // namespace fvm |
| |
| #endif // SRC_STORAGE_FVM_METADATA_BUFFER_H_ |