Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/nsgmls/CodingSystem.h

@@ -0,0 +1,103 @@
+/* $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>
+
+class streambuf;
+
+#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 */