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1 | // Created on: 2001-10-01 |
2 | // Created by: Julia DOROVSKIKH |
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3 | // Copyright (c) 2001-2014 OPEN CASCADE SAS |
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4 | // |
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5 | // This file is part of Open CASCADE Technology software library. |
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6 | // |
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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 |
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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. |
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12 | // |
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13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
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15 | |
16 | #ifndef LDOM_OSStream_HeaderFile |
17 | #define LDOM_OSStream_HeaderFile |
18 | |
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19 | #include <NCollection_DefineAlloc.hxx> |
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20 | #include <NCollection_BaseAllocator.hxx> |
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21 | #include <Standard_OStream.hxx> |
22 | #include <Standard_Boolean.hxx> |
23 | |
24 | #include <stdlib.h> |
25 | #include <stdio.h> /* EOF */ |
26 | |
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27 | //! Class LDOM_SBuffer inherits std::streambuf and |
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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 |
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32 | { |
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33 | //! One element of sequence. |
34 | //! Can only be allocated by the allocator and assumes |
35 | //! it is IncAllocator, so destructor isn't required. |
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36 | struct LDOM_StringElem |
37 | { |
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 |
41 | |
42 | DEFINE_NCOLLECTION_ALLOC |
43 | |
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44 | LDOM_StringElem(const int, const Handle(NCollection_BaseAllocator)&); |
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45 | ~LDOM_StringElem(); |
46 | |
47 | private: |
48 | LDOM_StringElem (const LDOM_StringElem&); |
49 | LDOM_StringElem& operator= (const LDOM_StringElem&); |
50 | }; |
51 | |
52 | public: |
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53 | //! Constructor. Sets a default value for the |
54 | //! length of each sequence element. |
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55 | Standard_EXPORT LDOM_SBuffer (const Standard_Integer theMaxBuf); |
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56 | |
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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. |
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62 | Standard_EXPORT Standard_CString str () const; |
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63 | |
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64 | //! Returns full length of data contained |
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65 | Standard_Integer Length () const {return myLength;} |
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66 | |
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67 | //! Clears first element of sequence and removes all others |
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68 | Standard_EXPORT void Clear (); |
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69 | |
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70 | // Methods of std::streambuf |
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71 | |
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72 | Standard_EXPORT virtual int overflow(int c = EOF) Standard_OVERRIDE; |
73 | Standard_EXPORT virtual int underflow() Standard_OVERRIDE; |
74 | //virtual int uflow(); |
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75 | |
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76 | Standard_EXPORT virtual std::streamsize xsputn(const char* s, std::streamsize n) Standard_OVERRIDE; |
77 | //virtual int xsgetn(char* s, int n); |
78 | //virtual int sync(); |
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79 | |
80 | Standard_EXPORT ~LDOM_SBuffer (); |
81 | // Destructor |
82 | |
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83 | private: |
84 | |
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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 |
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89 | Handle(NCollection_BaseAllocator) myAlloc; //allocator for chunks |
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90 | }; |
91 | |
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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. |
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96 | //! It inherits Standard_OStream (std::ostream). |
97 | //! Beside methods of std::ostream, it also has additional |
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98 | //! useful methods: str(), Length() and Clear(). |
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99 | class LDOM_OSStream : public Standard_OStream |
100 | { |
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101 | public: |
102 | //! Constructor |
103 | Standard_EXPORT LDOM_OSStream(const Standard_Integer theMaxBuf); |
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104 | |
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105 | Standard_CString str () const {return myBuffer.str();} |
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106 | |
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107 | Standard_Integer Length () const { return myBuffer.Length(); } |
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108 | |
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109 | void Clear () { myBuffer.Clear(); } |
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110 | |
111 | private: |
112 | LDOM_SBuffer myBuffer; |
113 | }; |
114 | |
115 | #endif |