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//
// StreamConverter.h
//
// Library: Foundation
// Package: Text
// Module: StreamConverter
//
// Definition of the StreamConverter class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_StreamConverter_INCLUDED
#define Foundation_StreamConverter_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/TextEncoding.h"
#include "Poco/UnbufferedStreamBuf.h"
#include <istream>
#include <ostream>
namespace Poco {
class Foundation_API StreamConverterBuf: public UnbufferedStreamBuf
/// A StreamConverter converts streams from one encoding (inEncoding)
/// into another (outEncoding).
/// If a character cannot be represented in outEncoding, defaultChar
/// is used instead.
/// If a byte sequence is not valid in inEncoding, defaultChar is used
/// instead and the encoding error count is incremented.
{
public:
StreamConverterBuf(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
/// Creates the StreamConverterBuf and connects it
/// to the given input stream.
StreamConverterBuf(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
/// Creates the StreamConverterBuf and connects it
/// to the given output stream.
~StreamConverterBuf();
/// Destroys the StreamConverterBuf.
int errors() const;
/// Returns the number of encoding errors encountered.
protected:
int readFromDevice();
int writeToDevice(char c);
private:
std::istream* _pIstr;
std::ostream* _pOstr;
const TextEncoding& _inEncoding;
const TextEncoding& _outEncoding;
int _defaultChar;
unsigned char _buffer[TextEncoding::MAX_SEQUENCE_LENGTH];
int _sequenceLength;
int _pos;
int _errors;
};
class Foundation_API StreamConverterIOS: public virtual std::ios
/// The base class for InputStreamConverter and OutputStreamConverter.
///
/// This class is needed to ensure the correct initialization
/// order of the stream buffer and base classes.
{
public:
StreamConverterIOS(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
StreamConverterIOS(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
~StreamConverterIOS();
StreamConverterBuf* rdbuf();
int errors() const;
protected:
StreamConverterBuf _buf;
};
class Foundation_API InputStreamConverter: public StreamConverterIOS, public std::istream
/// This stream converts all characters read from the
/// underlying istream from one character encoding into another.
/// If a character cannot be represented in outEncoding, defaultChar
/// is used instead.
/// If a byte sequence read from the underlying stream is not valid in inEncoding,
/// defaultChar is used instead and the encoding error count is incremented.
{
public:
InputStreamConverter(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
/// Creates the InputStreamConverter and connects it
/// to the given input stream.
~InputStreamConverter();
/// Destroys the stream.
};
class Foundation_API OutputStreamConverter: public StreamConverterIOS, public std::ostream
/// This stream converts all characters written to the
/// underlying ostream from one character encoding into another.
/// If a character cannot be represented in outEncoding, defaultChar
/// is used instead.
/// If a byte sequence written to the stream is not valid in inEncoding,
/// defaultChar is used instead and the encoding error count is incremented.
{
public:
OutputStreamConverter(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar = '?');
/// Creates the OutputStreamConverter and connects it
/// to the given input stream.
~OutputStreamConverter();
/// Destroys the CountingOutputStream.
};
} // namespace Poco
#endif // Foundation_StreamConverter_INCLUDED
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