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// Copyright 2019 The Chromium 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 MOJO_PUBLIC_CPP_SYSTEM_STRING_DATA_SOURCE_H_
#define MOJO_PUBLIC_CPP_SYSTEM_STRING_DATA_SOURCE_H_
#include <string>
#include "base/containers/span.h"
#include "base/strings/string_piece.h"
#include "mojo/public/cpp/system/data_pipe_producer.h"
#include "mojo/public/cpp/system/system_export.h"
namespace mojo {
// A class to wrap base::StringPiece as DataPipeProducer::DataSource class.
class MOJO_CPP_SYSTEM_EXPORT StringDataSource final
: public DataPipeProducer::DataSource {
public:
enum class AsyncWritingMode {
// The |data| given to the constructor may be invalidated before completion
// |callback| is called. The pending |data| is copied and owned by this
// class until all bytes are written.
STRING_MAY_BE_INVALIDATED_BEFORE_COMPLETION,
// The |data| given to the constructor stays valid until this instance is
// moved to DataPipeProducer and the completion callback is called.
STRING_STAYS_VALID_UNTIL_COMPLETION
};
StringDataSource(base::span<const char> data, AsyncWritingMode mode);
StringDataSource(const StringDataSource&) = delete;
StringDataSource& operator=(const StringDataSource&) = delete;
~StringDataSource() override;
private:
// DataPipeProducer::DataSource:
uint64_t GetLength() const override;
ReadResult Read(uint64_t offset, base::span<char> buffer) override;
std::string data_;
base::span<const char> data_view_;
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_SYSTEM_STRING_DATA_SOURCE_H_
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