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crypto/vm/db/BlobView.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+#include "td/utils/buffer.h"
+
+namespace vm {
+class BlobView {
+ public:
+  virtual ~BlobView() = default;
+  td::Result<td::Slice> view(td::MutableSlice slice, td::uint64 offset);
+  virtual td::uint64 size() = 0;
+
+ private:
+  virtual td::Result<td::Slice> view_impl(td::MutableSlice slice, td::uint64 offset) = 0;
+};
+
+class BufferSliceBlobView {
+ public:
+  static std::unique_ptr<BlobView> create(td::BufferSlice slice);
+};
+class FileBlobView {
+ public:
+  static td::Result<std::unique_ptr<BlobView>> create(td::CSlice file_path, td::uint64 file_size = 0);
+};
+class FileMemoryMappingBlobView {
+ public:
+  static td::Result<std::unique_ptr<BlobView>> create(td::CSlice file_path, td::uint64 file_size = 0);
+};
+}  // namespace vm