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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifndef CodingSystem_INCLUDED
#define CodingSystem_INCLUDED 1
#ifdef __GNUG__
#pragma interface
#endif
#include "types.h"
#include "Boolean.h"
#include "StringC.h"
#include "OutputByteStream.h"
#include <stddef.h>
#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, OutputByteStream *) = 0;
};
Encoder();
virtual ~Encoder();
virtual void output(const Char *, size_t, OutputByteStream *) = 0;
// This outputs a byte order mark with Unicode.
virtual void startFile(OutputByteStream *);
virtual void output(Char *, size_t, OutputByteStream *);
virtual void setUnencodableHandler(Handler *);
virtual void handleUnencodable(Char, OutputByteStream *);
};
class SP_API RecoveringEncoder : public Encoder {
public:
RecoveringEncoder();
void setUnencodableHandler(Handler *);
void handleUnencodable(Char, OutputByteStream *);
private:
Handler *unencodableHandler_;
};
class SP_API InputCodingSystem {
public:
virtual ~InputCodingSystem();
// one of these has to be overwritten
virtual Decoder *makeDecoder() const { return makeDecoder(1); }
virtual Decoder *makeDecoder(Boolean lsbFirst) const { return makeDecoder(lsbFirst,1); }
virtual Decoder *makeDecoder(Boolean lsbFirst, Boolean lswFirst) const { return makeDecoder(); }
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_;
}
#ifdef SP_NAMESPACE
}
#endif
#endif /* not CodingSystem_INCLUDED */
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