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 // Created on: 2001-10-01
 // Created by: Julia DOROVSKIKH
 // Copyright (c) 2001-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef LDOM_OSStream_HeaderFile
 #define LDOM_OSStream_HeaderFile
 
 #include <NCollection_DefineAlloc.hxx>
 #include <NCollection_BaseAllocator.hxx>
 #include <Standard_OStream.hxx>
 
 #include <stdio.h> /* EOF */
 
 //! Class LDOM_SBuffer inherits std::streambuf and
 //! redefines some virtual methods of it (overflow() and xsputn()).
 //! This class contains pointers on first and current element 
 //! of sequence, also it has methods for the sequence management.
 class LDOM_SBuffer : public std::streambuf
 {
   //! One element of sequence.
   //! Can only be allocated by the allocator and assumes
   //! it is IncAllocator, so destructor isn't required.
   struct LDOM_StringElem
   {
     char*            buf;  //!< pointer on data string
     int              len;  //!< quantity of really written data
     LDOM_StringElem* next; //!< pointer on the next element of a sequence
 
     DEFINE_NCOLLECTION_ALLOC
 
     LDOM_StringElem(const int, const Handle(NCollection_BaseAllocator)&);
     ~LDOM_StringElem();
 
   private:
     LDOM_StringElem (const LDOM_StringElem&);
     LDOM_StringElem& operator= (const LDOM_StringElem&);
   };
 
 public:
   //! Constructor. Sets a default value for the
   //!              length of each sequence element.
   Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf);
 
   //! Concatenates strings of all sequence elements
   //! into one string. Space for output string is allocated
   //! with operator new.
   //! Caller of this function is responsible
   //! for memory release after the string usage.
   Standard_EXPORT Standard_CString str () const;
 
   //! Returns full length of data contained
   Standard_Integer Length () const {return myLength;}
 
   //! Clears first element of sequence and removes all others
   Standard_EXPORT void Clear ();
 
   // Methods of std::streambuf
 
   Standard_EXPORT virtual int overflow(int c = EOF) Standard_OVERRIDE;
   Standard_EXPORT virtual int underflow() Standard_OVERRIDE;
   //virtual int uflow();
 
   Standard_EXPORT virtual std::streamsize xsputn(const char* s, std::streamsize n) Standard_OVERRIDE;
   //virtual int xsgetn(char* s, int n);
   //virtual int sync();
 
   Standard_EXPORT ~LDOM_SBuffer ();
   // Destructor
 
 private:
 
   Standard_Integer      myMaxBuf; // default length of one element
   Standard_Integer      myLength; // full length of contained data
   LDOM_StringElem* myFirstString; // the head of the sequence
   LDOM_StringElem* myCurString;   // current element of the sequence
   Handle(NCollection_BaseAllocator) myAlloc; //allocator for chunks
 };
 
 //! Subclass if std::ostream allowing to increase performance
 //! of outputting data into a string avoiding reallocation of buffer.
 //! Class LDOM_OSStream implements output into a sequence of
 //! strings and getting the result as a string.
 //! It inherits Standard_OStream (std::ostream).
 //! Beside methods of std::ostream, it also has additional
 //! useful methods: str(), Length() and Clear().
 class LDOM_OSStream : public Standard_OStream
 {
 public:
   //! Constructor
   Standard_EXPORT LDOM_OSStream(const Standard_Integer theMaxBuf);
 
   Standard_EXPORT virtual ~LDOM_OSStream();
 
   Standard_CString str () const {return myBuffer.str();}
 
   Standard_Integer Length () const { return myBuffer.Length(); }
 
   void Clear () { myBuffer.Clear(); }
 
  private:
   LDOM_SBuffer myBuffer;
 
 public:
   // byte order mark defined at the start of a stream
   enum BOMType {
     BOM_UNDEFINED,
     BOM_UTF8,
     BOM_UTF16BE,
     BOM_UTF16LE,
     BOM_UTF32BE,
     BOM_UTF32LE,
     BOM_UTF7,
     BOM_UTF1,
     BOM_UTFEBCDIC,
     BOM_SCSU,
     BOM_BOCU1,
     BOM_GB18030
   };
 };
 
 #endif

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