1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : *
3 : * ***** BEGIN LICENSE BLOCK *****
4 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 : *
6 : * The contents of this file are subject to the Mozilla Public License Version
7 : * 1.1 (the "License"); you may not use this file except in compliance with
8 : * the License. You may obtain a copy of the License at
9 : * http://www.mozilla.org/MPL/
10 : *
11 : * Software distributed under the License is distributed on an "AS IS" basis,
12 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 : * for the specific language governing rights and limitations under the
14 : * License.
15 : *
16 : * The Original Code is nsDiskCacheStreams.h, released
17 : * June 13, 2001.
18 : *
19 : * The Initial Developer of the Original Code is
20 : * Netscape Communications Corporation.
21 : * Portions created by the Initial Developer are Copyright (C) 2001
22 : * the Initial Developer. All Rights Reserved.
23 : *
24 : * Contributor(s):
25 : * Gordon Sheridan <gordon@netscape.com>
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either the GNU General Public License Version 2 or later (the "GPL"), or
29 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 :
42 : #ifndef _nsDiskCacheStreams_h_
43 : #define _nsDiskCacheStreams_h_
44 :
45 : #include "nsDiskCacheBinding.h"
46 :
47 : #include "nsCache.h"
48 :
49 : #include "nsIInputStream.h"
50 : #include "nsIOutputStream.h"
51 :
52 : #include "pratom.h"
53 :
54 : class nsDiskCacheInputStream;
55 : class nsDiskCacheOutputStream;
56 : class nsDiskCacheDevice;
57 :
58 : class nsDiskCacheStreamIO : public nsISupports {
59 : public:
60 : nsDiskCacheStreamIO(nsDiskCacheBinding * binding);
61 : virtual ~nsDiskCacheStreamIO();
62 :
63 : NS_DECL_ISUPPORTS
64 :
65 : nsresult GetInputStream(PRUint32 offset, nsIInputStream ** inputStream);
66 : nsresult GetOutputStream(PRUint32 offset, nsIOutputStream ** outputStream);
67 :
68 : nsresult CloseOutputStream(nsDiskCacheOutputStream * outputStream);
69 : nsresult CloseOutputStreamInternal(nsDiskCacheOutputStream * outputStream);
70 :
71 : nsresult Write( const char * buffer,
72 : PRUint32 count,
73 : PRUint32 * bytesWritten);
74 :
75 : nsresult Seek(PRInt32 whence, PRInt32 offset);
76 : nsresult Tell(PRUint32 * position);
77 : nsresult SetEOF();
78 :
79 : nsresult ClearBinding();
80 :
81 172 : void IncrementInputStreamCount() { PR_ATOMIC_INCREMENT(&mInStreamCount); }
82 172 : void DecrementInputStreamCount()
83 : {
84 172 : PR_ATOMIC_DECREMENT(&mInStreamCount);
85 172 : NS_ASSERTION(mInStreamCount >= 0, "mInStreamCount has gone negative");
86 172 : }
87 :
88 : // GCC 2.95.2 requires this to be defined, although we never call it.
89 : // and OS/2 requires that it not be private
90 : nsDiskCacheStreamIO() { NS_NOTREACHED("oops"); }
91 : private:
92 :
93 :
94 : void Close();
95 : nsresult OpenCacheFile(PRIntn flags, PRFileDesc ** fd);
96 : nsresult ReadCacheBlocks();
97 : nsresult FlushBufferToFile();
98 : void UpdateFileSize();
99 : void DeleteBuffer();
100 : nsresult Flush();
101 :
102 :
103 : nsDiskCacheBinding * mBinding; // not an owning reference
104 : nsDiskCacheDevice * mDevice;
105 : nsDiskCacheOutputStream * mOutStream; // not an owning reference
106 : PRInt32 mInStreamCount;
107 : nsCOMPtr<nsILocalFile> mLocalFile;
108 : PRFileDesc * mFD;
109 :
110 : PRUint32 mStreamPos; // for Output Streams
111 : PRUint32 mStreamEnd;
112 : PRUint32 mBufPos; // current mark in buffer
113 : PRUint32 mBufEnd; // current end of data in buffer
114 : PRUint32 mBufSize; // current end of buffer
115 : bool mBufDirty;
116 : char * mBuffer;
117 :
118 : };
119 :
120 : #endif // _nsDiskCacheStreams_h_
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