zipCryptStream.h

Engine/source/core/util/zip/zipCryptStream.h
Classes:

class
Detailed Description

 1
 2//-----------------------------------------------------------------------------
 3// Copyright (c) 2012 GarageGames, LLC
 4//
 5// Permission is hereby granted, free of charge, to any person obtaining a copy
 6// of this software and associated documentation files (the "Software"), to
 7// deal in the Software without restriction, including without limitation the
 8// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 9// sell copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11//
12// The above copyright notice and this permission notice shall be included in
13// all copies or substantial portions of the Software.
14//
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21// IN THE SOFTWARE.
22//-----------------------------------------------------------------------------
23
24#ifndef _ZIPCRYPTSTREAM_H_
25#define _ZIPCRYPTSTREAM_H_
26
27#ifndef _FILTERSTREAM_H_
28#include "core/filterStream.h"
29#endif
30
31class ZipCryptRStream : public FilterStream
32{
33   typedef FilterStream Parent;
34
35   Stream *mStream;
36
37   S32 mStreamStartPos;
38   S32 mFileStartPos;
39   S32 mFileEndPos;
40   
41   U32 mKeys[3]; // mKeys and it's usage is very unclear and has a ton of magic numbers -patw
42   
43   const char *mPassword;
44
45   U32 fillBuffer(const U32 in_attemptSize, void *pBuffer);
46
47public:
48   ZipCryptRStream();
49   virtual ~ZipCryptRStream();
50
51   void setPassword(const char *password);
52   inline void setFileEndPos(S32 pos)        { mFileEndPos = pos; }
53
54   // Overrides of FilterStream
55   bool attachStream(Stream* io_pSlaveStream);
56   void detachStream();
57   Stream *getStream()                       { return mStream; }
58
59   U32  getPosition() const;
60   bool setPosition(const U32 in_newPosition);
61
62protected:
63   bool _read(const U32 in_numBytes,  void* out_pBuffer);
64
65   void updateKeys(const U8 c);
66   U8 decryptByte();
67};
68
69#endif // _ZIPCRYPTSTREAM_H_
70