ClickHouse/base/poco/Foundation/include/Poco/StreamCopier.h

//
// StreamCopier.h
//
// Library: Foundation
// Package: Streams
// Module:  StreamCopier
//
// Definition of class StreamCopier.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_StreamCopier_INCLUDED
#define Foundation_StreamCopier_INCLUDED


#include <cstddef>
#include <istream>
#include <ostream>
#include "Poco/Foundation.h"


namespace Poco
{


class Foundation_API StreamCopier
/// This class provides static methods to copy the contents from one stream
/// into another.
{
public:
    static std::streamsize copyStream(std::istream & istr, std::ostream & ostr, std::size_t bufferSize = 8192);
    /// Writes all bytes readable from istr to ostr, using an internal buffer.
    ///
    /// Returns the number of bytes copied.

    static Poco::UInt64 copyStream64(std::istream & istr, std::ostream & ostr, std::size_t bufferSize = 8192);
    /// Writes all bytes readable from istr to ostr, using an internal buffer.
    ///
    /// Returns the number of bytes copied as a 64-bit unsigned integer.
    ///
    /// Note: the only difference to copyStream() is that a 64-bit unsigned
    /// integer is used to count the number of bytes copied.

    static std::streamsize copyStreamUnbuffered(std::istream & istr, std::ostream & ostr);
    /// Writes all bytes readable from istr to ostr.
    ///
    /// Returns the number of bytes copied.

    static Poco::UInt64 copyStreamUnbuffered64(std::istream & istr, std::ostream & ostr);
    /// Writes all bytes readable from istr to ostr.
    ///
    /// Returns the number of bytes copied as a 64-bit unsigned integer.
    ///
    /// Note: the only difference to copyStreamUnbuffered() is that a 64-bit unsigned
    /// integer is used to count the number of bytes copied.

    static std::streamsize copyToString(std::istream & istr, std::string & str, std::size_t bufferSize = 8192);
    /// Appends all bytes readable from istr to the given string, using an internal buffer.
    ///
    /// Returns the number of bytes copied.

    static Poco::UInt64 copyToString64(std::istream & istr, std::string & str, std::size_t bufferSize = 8192);
    /// Appends all bytes readable from istr to the given string, using an internal buffer.
    ///
    /// Returns the number of bytes copied as a 64-bit unsigned integer.
    ///
    /// Note: the only difference to copyToString() is that a 64-bit unsigned
    /// integer is used to count the number of bytes copied.
};


} // namespace Poco


#endif // Foundation_StreamCopier_INCLUDED