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cde/cde/programs/nsgmls/CodingSystem.h
2018-05-24 18:22:55 -06:00

130 lines
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C++

/*
* CDE - Common Desktop Environment
*
* Copyright (c) 1993-2012, The Open Group. All rights reserved.
*
* These libraries and programs are free software; you can
* redistribute them and/or modify them under the terms of the GNU
* Lesser General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* These libraries and programs are distributed in the hope that
* they will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with these libraries and programs; if not, write
* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
* Floor, Boston, MA 02110-1301 USA
*/
/* $XConsortium: CodingSystem.h /main/1 1996/07/29 16:48:04 cde-hp $ */
// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifndef CodingSystem_INCLUDED
#define CodingSystem_INCLUDED 1
#ifdef __GNUG__
#pragma interface
#endif
#ifndef SP_API
#define SP_API
#endif
#include "types.h"
#include "Boolean.h"
#include "StringC.h"
#include <stddef.h>
#if defined(__linux__) || defined(CSRG_BASED) || defined(sun)
#include <streambuf>
using namespace std;
#else
class streambuf;
#endif
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class SP_API Decoder {
public:
Decoder(unsigned minBytesPerChar = 1);
virtual ~Decoder();
virtual size_t decode(Char *, const char *, size_t, const char **) = 0;
virtual Boolean convertOffset(unsigned long &offset) const;
// Decoder assumes that for every decoded Char there must be at least
// minBytesPerChar bytes
unsigned minBytesPerChar() const;
protected:
unsigned minBytesPerChar_;
};
class SP_API Encoder {
public:
class SP_API Handler {
public:
virtual void handleUnencodable(Char, streambuf *) = 0;
};
Encoder();
virtual ~Encoder();
virtual void output(const Char *, size_t, streambuf *) = 0;
// This outputs a byte order mark with Unicode.
virtual void startFile(streambuf *);
virtual void output(Char *, size_t, streambuf *);
void setUnencodableHandler(Handler *);
protected:
void handleUnencodable(Char, streambuf *);
private:
Handler *unencodableHandler_;
};
class SP_API InputCodingSystem {
public:
virtual ~InputCodingSystem();
virtual Decoder *makeDecoder() const = 0;
StringC convertIn(const char *) const;
virtual Boolean isIdentity() const;
};
class SP_API OutputCodingSystem {
public:
virtual ~OutputCodingSystem();
virtual Encoder *makeEncoder() const = 0;
virtual unsigned fixedBytesPerChar() const;
String<char> convertOut(const StringC &) const;
};
class SP_API CodingSystem : public InputCodingSystem, public OutputCodingSystem {
};
inline
unsigned Decoder::minBytesPerChar() const
{
return minBytesPerChar_;
}
inline
void Encoder::handleUnencodable(Char c, streambuf *sbufp)
{
if (unencodableHandler_)
unencodableHandler_->handleUnencodable(c, sbufp);
}
inline
void Encoder::setUnencodableHandler(Handler *handler)
{
unencodableHandler_ = handler;
}
#ifdef SP_NAMESPACE
}
#endif
#endif /* not CodingSystem_INCLUDED */