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>
22 #include <Standard_Boolean.hxx>
25 #include <stdio.h> /* EOF */
27 //! Class LDOM_SBuffer inherits streambuf and
28 //! redefines some virtual methods of it (overflow() and xsputn()).
29 //! This class contains pointers on first and current element
30 //! of sequence, also it has methods for the sequence management.
31 class LDOM_SBuffer : public std::streambuf
33 //! One element of sequence.
34 //! Can only be allocated by the allocator and assumes
35 //! it is IncAllocator, so destructor isn't required.
36 struct LDOM_StringElem
38 char* buf; //!< pointer on data string
39 int len; //!< quantity of really written data
40 LDOM_StringElem* next; //!< pointer on the next element of a sequence
42 DEFINE_NCOLLECTION_ALLOC
44 LDOM_StringElem(const int, const Handle(NCollection_BaseAllocator)&);
48 LDOM_StringElem (const LDOM_StringElem&);
49 LDOM_StringElem& operator= (const LDOM_StringElem&);
53 //! Constructor. Sets a default value for the
54 //! length of each sequence element.
55 Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf);
57 //! Concatenates strings of all sequence elements
58 //! into one string. Space for output string is allocated
59 //! with operator new.
60 //! Caller of this function is responsible
61 //! for memory release after the string usage.
62 Standard_EXPORT Standard_CString str () const;
64 //! Returns full length of data contained
65 Standard_Integer Length () const {return myLength;}
67 //! Clears first element of sequence and removes all others
68 Standard_EXPORT void Clear ();
70 // Methods of streambuf
72 Standard_EXPORT virtual int overflow(int c = EOF) Standard_OVERRIDE;
73 Standard_EXPORT virtual int underflow() Standard_OVERRIDE;
74 //virtual int uflow();
76 Standard_EXPORT virtual std::streamsize xsputn(const char* s, std::streamsize n) Standard_OVERRIDE;
77 //virtual int xsgetn(char* s, int n);
80 Standard_EXPORT ~LDOM_SBuffer ();
85 Standard_Integer myMaxBuf; // default length of one element
86 Standard_Integer myLength; // full length of contained data
87 LDOM_StringElem* myFirstString; // the head of the sequence
88 LDOM_StringElem* myCurString; // current element of the sequence
89 Handle(NCollection_BaseAllocator) myAlloc; //allocator for chunks
92 //! Subclass if std::ostream allowing to increase performance
93 //! of outputting data into a string avoiding reallocation of buffer.
94 //! Class LDOM_OSStream implements output into a sequence of
95 //! strings and getting the result as a string.
96 //! It inherits Standard_OStream (ostream).
97 //! Beside methods of ostream, it also has additional
98 //! useful methods: str(), Length() and Clear().
99 class LDOM_OSStream : public Standard_OStream
103 Standard_EXPORT LDOM_OSStream(const Standard_Integer theMaxBuf);
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;