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1// Copyright (C) 2002-2012 Nikolaus Gebhardt
2// This file is part of the "Irrlicht Engine".
3// For conditions of distribution and use, see copyright notice in irrlicht.h
4
5#ifndef __C_LIMIT_READ_FILE_H_INCLUDED__
6#define __C_LIMIT_READ_FILE_H_INCLUDED__
7
8#include "IReadFile.h"
9#include "irrString.h"
10
11namespace irr
12{
13 class CUnicodeConverter;
14
15namespace io
16{
17
18 /*! this is a read file, which is limited to some boundaries,
19 so that it may only start from a certain file position
20 and may only read until a certain file position.
21 This can be useful, for example for reading uncompressed files
22 in an archive (zip, tar).
23 !*/
24 class CLimitReadFile : public IReadFile
25 {
26 public:
27
28 CLimitReadFile(IReadFile* alreadyOpenedFile, long pos, long areaSize, const io::path& name);
29
30 virtual ~CLimitReadFile();
31
32 //! returns how much was read
33 virtual s32 read(void* buffer, u32 sizeToRead);
34
35 //! changes position in file, returns true if successful
36 //! if relativeMovement==true, the pos is changed relative to current pos,
37 //! otherwise from begin of file
38 virtual bool seek(long finalPos, bool relativeMovement = false);
39
40 //! returns size of file
41 virtual long getSize() const;
42
43 //! returns where in the file we are.
44 virtual long getPos() const;
45
46 //! returns name of file
47 virtual const io::path& getFileName() const;
48
49 private:
50
51 io::path Filename;
52 long AreaStart;
53 long AreaEnd;
54 long Pos;
55 IReadFile* File;
56 };
57
58} // end namespace io
59} // end namespace irr
60
61#endif
62