1 | /*****************************************************************************/ |
2 | // Copyright 2006-2007 Adobe Systems Incorporated |
3 | // All Rights Reserved. |
4 | // |
5 | // NOTICE: Adobe permits you to use, modify, and distribute this file in |
6 | // accordance with the terms of the Adobe license agreement accompanying it. |
7 | /*****************************************************************************/ |
8 | |
9 | /* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_memory_stream.h#2 $ */ |
10 | /* $DateTime: 2012/07/31 22:04:34 $ */ |
11 | /* $Change: 840853 $ */ |
12 | /* $Author: tknoll $ */ |
13 | |
14 | /** \file |
15 | * Stream abstraction to/from in-memory data. |
16 | */ |
17 | |
18 | /*****************************************************************************/ |
19 | |
20 | #ifndef __dng_memory_stream__ |
21 | #define __dng_memory_stream__ |
22 | |
23 | /*****************************************************************************/ |
24 | |
25 | #include "dng_stream.h" |
26 | |
27 | /*****************************************************************************/ |
28 | |
29 | /// \brief A dng_stream which can be read from or written to memory. |
30 | /// |
31 | /// Stream is populated via writing and either read or accessed by asking for contents as a pointer. |
32 | |
33 | class dng_memory_stream: public dng_stream |
34 | { |
35 | |
36 | protected: |
37 | |
38 | dng_memory_allocator &fAllocator; |
39 | |
40 | uint32 fPageSize; |
41 | |
42 | uint32 fPageCount; |
43 | uint32 fPagesAllocated; |
44 | |
45 | dng_memory_block **fPageList; |
46 | |
47 | uint64 fMemoryStreamLength; |
48 | |
49 | public: |
50 | |
51 | /// Construct a new memory-based stream. |
52 | /// \param allocator Allocator to use to allocate memory in stream as needed. |
53 | /// \param sniffer If non-NULL used to check for user cancellation. |
54 | /// \param pageSize Unit of allocation for data stored in stream. |
55 | |
56 | dng_memory_stream (dng_memory_allocator &allocator, |
57 | dng_abort_sniffer *sniffer = NULL, |
58 | uint32 pageSize = 64 * 1024); |
59 | |
60 | virtual ~dng_memory_stream (); |
61 | |
62 | /// Copy a specified number of bytes to a target stream. |
63 | /// \param dstStream The target stream. |
64 | /// \param count The number of bytes to copy. |
65 | |
66 | virtual void CopyToStream (dng_stream &dstStream, |
67 | uint64 count); |
68 | |
69 | protected: |
70 | |
71 | virtual uint64 DoGetLength (); |
72 | |
73 | virtual void DoRead (void *data, |
74 | uint32 count, |
75 | uint64 offset); |
76 | |
77 | virtual void DoSetLength (uint64 length); |
78 | |
79 | virtual void DoWrite (const void *data, |
80 | uint32 count, |
81 | uint64 offset); |
82 | |
83 | private: |
84 | |
85 | // Hidden copy constructor and assignment operator. |
86 | |
87 | dng_memory_stream (const dng_memory_stream &stream); |
88 | |
89 | dng_memory_stream & operator= (const dng_memory_stream &stream); |
90 | |
91 | }; |
92 | |
93 | /*****************************************************************************/ |
94 | |
95 | #endif |
96 | |
97 | /*****************************************************************************/ |
98 | |