1 // Created on: 2001-10-01
2 // Created by: Julia DOROVSKIKH
3 // Copyright (c) 2001-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef LDOM_OSStream_HeaderFile
17 #define LDOM_OSStream_HeaderFile
19 #include <NCollection_DefineAlloc.hxx>
20 #include <NCollection_BaseAllocator.hxx>
21 #include <Standard_OStream.hxx>
23 #include <stdio.h> /* EOF */
25 //! Class LDOM_SBuffer inherits std::streambuf and
26 //! redefines some virtual methods of it (overflow() and xsputn()).
27 //! This class contains pointers on first and current element
28 //! of sequence, also it has methods for the sequence management.
29 class LDOM_SBuffer : public std::streambuf
31 //! One element of sequence.
32 //! Can only be allocated by the allocator and assumes
33 //! it is IncAllocator, so destructor isn't required.
34 struct LDOM_StringElem
36 char* buf; //!< pointer on data string
37 int len; //!< quantity of really written data
38 LDOM_StringElem* next; //!< pointer on the next element of a sequence
40 DEFINE_NCOLLECTION_ALLOC
42 LDOM_StringElem(const int, const Handle(NCollection_BaseAllocator)&);
46 LDOM_StringElem (const LDOM_StringElem&);
47 LDOM_StringElem& operator= (const LDOM_StringElem&);
51 //! Constructor. Sets a default value for the
52 //! length of each sequence element.
53 Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf);
55 //! Concatenates strings of all sequence elements
56 //! into one string. Space for output string is allocated
57 //! with operator new.
58 //! Caller of this function is responsible
59 //! for memory release after the string usage.
60 Standard_EXPORT Standard_CString str () const;
62 //! Returns full length of data contained
63 Standard_Integer Length () const {return myLength;}
65 //! Clears first element of sequence and removes all others
66 Standard_EXPORT void Clear ();
68 // Methods of std::streambuf
70 Standard_EXPORT virtual int overflow(int c = EOF) Standard_OVERRIDE;
71 Standard_EXPORT virtual int underflow() Standard_OVERRIDE;
72 //virtual int uflow();
74 Standard_EXPORT virtual std::streamsize xsputn(const char* s, std::streamsize n) Standard_OVERRIDE;
75 //virtual int xsgetn(char* s, int n);
78 Standard_EXPORT ~LDOM_SBuffer ();
83 Standard_Integer myMaxBuf; // default length of one element
84 Standard_Integer myLength; // full length of contained data
85 LDOM_StringElem* myFirstString; // the head of the sequence
86 LDOM_StringElem* myCurString; // current element of the sequence
87 Handle(NCollection_BaseAllocator) myAlloc; //allocator for chunks
90 //! Subclass if std::ostream allowing to increase performance
91 //! of outputting data into a string avoiding reallocation of buffer.
92 //! Class LDOM_OSStream implements output into a sequence of
93 //! strings and getting the result as a string.
94 //! It inherits Standard_OStream (std::ostream).
95 //! Beside methods of std::ostream, it also has additional
96 //! useful methods: str(), Length() and Clear().
97 class LDOM_OSStream : public Standard_OStream
101 Standard_EXPORT LDOM_OSStream(const Standard_Integer theMaxBuf);
103 Standard_EXPORT virtual ~LDOM_OSStream();
105 Standard_CString str () const {return myBuffer.str();}
107 Standard_Integer Length () const { return myBuffer.Length(); }
109 void Clear () { myBuffer.Clear(); }
112 LDOM_SBuffer myBuffer;
115 // byte order mark defined at the start of a stream