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tddb/td/db/binlog/BinlogReaderHelper.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/Status.h"
+#include "td/utils/Slice.h"
+
+namespace td {
+
+class BinlogReaderInterface;
+
+// Usually we have data available in chunks and we can't control chunk's sizes
+// And some events will be in multiple chunks.
+// We suggest that all events are small, chunks are big and only small
+// portion of events will lie on chunk's border.
+// This helper will store this rare events locally and will feed them
+// to BinlogReaderInterface as single memory chunk each.
+class BinlogReaderHelper {
+ public:
+  td::Status parse(BinlogReaderInterface& reader, td::Slice data);
+
+  size_t unparsed_size() const;
+
+ private:
+  alignas(16) std::array<char, 1024> buf_;
+  size_t prefix_size_{0};
+  size_t expected_prefix_size_{0};
+};
+
+}  // namespace td