98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
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// Copyright (c) 1994 James Clark
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// See the file COPYING for copying permission.
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#ifndef CodingSystem_INCLUDED
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#define CodingSystem_INCLUDED 1
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#ifdef __GNUG__
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#pragma interface
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#endif
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#include "types.h"
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#include "Boolean.h"
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#include "StringC.h"
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#include "OutputByteStream.h"
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#include <stddef.h>
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class SP_API Decoder {
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public:
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Decoder(unsigned minBytesPerChar = 1);
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virtual ~Decoder();
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virtual size_t decode(Char *, const char *, size_t, const char **) = 0;
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virtual Boolean convertOffset(unsigned long &offset) const;
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// Decoder assumes that for every decoded Char there must be at least
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// minBytesPerChar bytes
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unsigned minBytesPerChar() const;
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protected:
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unsigned minBytesPerChar_;
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};
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class SP_API Encoder {
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public:
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class SP_API Handler {
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public:
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virtual ~Handler();
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virtual void handleUnencodable(Char, OutputByteStream *) = 0;
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};
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Encoder();
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virtual ~Encoder();
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virtual void output(const Char *, size_t, OutputByteStream *) = 0;
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// This outputs a byte order mark with Unicode.
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virtual void startFile(OutputByteStream *);
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virtual void output(Char *, size_t, OutputByteStream *);
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virtual void setUnencodableHandler(Handler *);
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virtual void handleUnencodable(Char, OutputByteStream *);
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};
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class SP_API RecoveringEncoder : public Encoder {
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public:
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RecoveringEncoder();
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void setUnencodableHandler(Handler *);
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void handleUnencodable(Char, OutputByteStream *);
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private:
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Handler *unencodableHandler_;
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};
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class SP_API InputCodingSystem {
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public:
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virtual ~InputCodingSystem();
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// one of these has to be overwritten
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virtual Decoder *makeDecoder() const { return makeDecoder(1); }
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virtual Decoder *makeDecoder(Boolean lsbFirst) const { return makeDecoder(lsbFirst,1); }
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virtual Decoder *makeDecoder(Boolean lsbFirst, Boolean lswFirst) const { return makeDecoder(); }
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StringC convertIn(const char *) const;
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virtual Boolean isIdentity() const;
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};
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class SP_API OutputCodingSystem {
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public:
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virtual ~OutputCodingSystem();
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virtual Encoder *makeEncoder() const = 0;
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virtual unsigned fixedBytesPerChar() const;
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String<char> convertOut(const StringC &) const;
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};
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class SP_API CodingSystem : public InputCodingSystem, public OutputCodingSystem {
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public:
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inline ~CodingSystem() {}
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};
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inline
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unsigned Decoder::minBytesPerChar() const
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{
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return minBytesPerChar_;
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}
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#ifdef SP_NAMESPACE
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}
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#endif
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#endif /* not CodingSystem_INCLUDED */
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