ClickHouse/base/poco/Foundation/include/Poco/Base32Encoder.h

//
// Base32Encoder.h
//
// Library: Foundation
// Package: Streams
// Module:  Base32
//
// Definition of class Base32Encoder.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Base32Encoder_INCLUDED
#define Foundation_Base32Encoder_INCLUDED


#include <ostream>
#include "Poco/Foundation.h"
#include "Poco/UnbufferedStreamBuf.h"


namespace Poco
{


class Foundation_API Base32EncoderBuf : public UnbufferedStreamBuf
/// This streambuf base32-encodes all data written
/// to it and forwards it to a connected
/// ostream.
///
/// Note: The characters are directly written
/// to the ostream's streambuf, thus bypassing
/// the ostream. The ostream's state is therefore
/// not updated to match the buffer's state.
{
public:
    Base32EncoderBuf(std::ostream & ostr, bool padding = true);
    ~Base32EncoderBuf();

    int close();
    /// Closes the stream buffer.

private:
    int writeToDevice(char c);

    unsigned char _group[5];
    int _groupLength;
    std::streambuf & _buf;
    bool _doPadding;

    static const unsigned char OUT_ENCODING[32];

    friend class Base32DecoderBuf;

    Base32EncoderBuf(const Base32EncoderBuf &);
    Base32EncoderBuf & operator=(const Base32EncoderBuf &);
};


class Foundation_API Base32EncoderIOS : public virtual std::ios
/// The base class for Base32Encoder.
///
/// This class is needed to ensure the correct initialization
/// order of the stream buffer and base classes.
{
public:
    Base32EncoderIOS(std::ostream & ostr, bool padding = true);
    ~Base32EncoderIOS();
    int close();
    Base32EncoderBuf * rdbuf();

protected:
    Base32EncoderBuf _buf;

private:
    Base32EncoderIOS(const Base32EncoderIOS &);
    Base32EncoderIOS & operator=(const Base32EncoderIOS &);
};


class Foundation_API Base32Encoder : public Base32EncoderIOS, public std::ostream
/// This ostream base32-encodes all data
/// written to it and forwards it to
/// a connected ostream.
/// Always call close() when done
/// writing data, to ensure proper
/// completion of the encoding operation.
///
/// Note: The characters are directly written
/// to the ostream's streambuf, thus bypassing
/// the ostream. The ostream's state is therefore
/// not updated to match the buffer's state.
{
public:
    Base32Encoder(std::ostream & ostr, bool padding = true);
    ~Base32Encoder();

private:
    Base32Encoder(const Base32Encoder &);
    Base32Encoder & operator=(const Base32Encoder &);
};


} // namespace Poco


#endif // Foundation_Base32Encoder_INCLUDED