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

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


#ifndef Foundation_HexBinaryEncoder_INCLUDED
#define Foundation_HexBinaryEncoder_INCLUDED


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


namespace Poco
{


class Foundation_API HexBinaryEncoderBuf : public UnbufferedStreamBuf
/// This streambuf encodes all data written
/// to it in hexBinary encoding and forwards it to a connected
/// ostream.
/// In hexBinary encoding, each binary octet is encoded as a character tuple,
/// consisting of two hexadecimal digits ([0-9a-fA-F]) representing the octet code.
/// See also: XML Schema Part 2: Datatypes (http://www.w3.org/TR/xmlschema-2/),
/// section 3.2.15.
///
/// 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:
    HexBinaryEncoderBuf(std::ostream & ostr);
    ~HexBinaryEncoderBuf();

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

    void setLineLength(int lineLength);
    /// Specify the line length.
    ///
    /// After the given number of characters have been written,
    /// a newline character will be written.
    ///
    /// Specify 0 for an unlimited line length.

    int getLineLength() const;
    /// Returns the currently set line length.

    void setUppercase(bool flag = true);
    /// Specify whether hex digits a-f are written in upper or lower case.

private:
    int writeToDevice(char c);

    int _pos;
    int _lineLength;
    int _uppercase;
    std::streambuf & _buf;
};


class Foundation_API HexBinaryEncoderIOS : public virtual std::ios
/// The base class for HexBinaryEncoder.
///
/// This class is needed to ensure the correct initialization
/// order of the stream buffer and base classes.
{
public:
    HexBinaryEncoderIOS(std::ostream & ostr);
    ~HexBinaryEncoderIOS();
    int close();
    HexBinaryEncoderBuf * rdbuf();

protected:
    HexBinaryEncoderBuf _buf;
};


class Foundation_API HexBinaryEncoder : public HexBinaryEncoderIOS, public std::ostream
/// This ostream encodes all data
/// written to it in BinHex encoding and forwards it to
/// a connected ostream.
/// Always call close() when done
/// writing data, to ensure proper
/// completion of the encoding operation.
/// In hexBinary encoding, each binary octet is encoded as a character tuple,
/// consisting of two hexadecimal digits ([0-9a-fA-F]) representing the octet code.
/// See also: XML Schema Part 2: Datatypes (http://www.w3.org/TR/xmlschema-2/),
/// section 3.2.15.
///
/// 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:
    HexBinaryEncoder(std::ostream & ostr);
    ~HexBinaryEncoder();
};


} // namespace Poco


#endif // Foundation_HexBinaryEncoder_INCLUDED