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