LCOV - code coverage report
Current view: directory - xpcom/io - nsStorageStream.h (source / functions) Found Hit Coverage
Test: app.info Lines: 2 2 100.0 %
Date: 2012-06-02 Functions: 2 2 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Communicator client code, released
      16                 :  * March 31, 1998.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 1998-1999
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      27                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : /*
      40                 :  * The storage stream provides an internal buffer that can be filled by a
      41                 :  * client using a single output stream.  One or more independent input streams
      42                 :  * can be created to read the data out non-destructively.  The implementation
      43                 :  * uses a segmented buffer internally to avoid realloc'ing of large buffers,
      44                 :  * with the attendant performance loss and heap fragmentation.
      45                 :  */
      46                 : 
      47                 : #ifndef _nsStorageStream_h_
      48                 : #define _nsStorageStream_h_
      49                 : 
      50                 : #include "nsIStorageStream.h"
      51                 : #include "nsIOutputStream.h"
      52                 : #include "nsMemory.h"
      53                 : 
      54                 : #define NS_STORAGESTREAM_CID                       \
      55                 : { /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */       \
      56                 :   0x669a9795,                                      \
      57                 :   0x6ff7,                                          \
      58                 :   0x4ed4,                                          \
      59                 :   {0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63} \
      60                 : }
      61                 : 
      62                 : #define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1"
      63                 : #define NS_STORAGESTREAM_CLASSNAME "Storage Stream"
      64                 : 
      65                 : class nsSegmentedBuffer;
      66                 : 
      67                 : class nsStorageStream : public nsIStorageStream,
      68                 :                         public nsIOutputStream
      69                 : {
      70                 : public:
      71                 :     nsStorageStream();
      72                 :     
      73                 :     NS_DECL_ISUPPORTS
      74                 :     NS_DECL_NSISTORAGESTREAM
      75                 :     NS_DECL_NSIOUTPUTSTREAM
      76                 : 
      77                 :     friend class nsStorageInputStream;
      78                 : 
      79                 : private:
      80                 :     ~nsStorageStream();
      81                 : 
      82                 :     nsSegmentedBuffer* mSegmentedBuffer;
      83                 :     PRUint32           mSegmentSize;       // All segments, except possibly the last, are of this size
      84                 :                                            //   Must be power-of-2
      85                 :     PRUint32           mSegmentSizeLog2;   // log2(mSegmentSize)
      86                 :     bool               mWriteInProgress;   // true, if an un-Close'ed output stream exists
      87                 :     PRInt32            mLastSegmentNum;    // Last segment # in use, -1 initially
      88                 :     char*              mWriteCursor;       // Pointer to next byte to be written
      89                 :     char*              mSegmentEnd;        // Pointer to one byte after end of segment
      90                 :                                            //   containing the write cursor
      91                 :     PRUint32           mLogicalLength;     // Number of bytes written to stream
      92                 : 
      93                 :     NS_METHOD Seek(PRInt32 aPosition);
      94             783 :     PRUint32 SegNum(PRUint32 aPosition)    {return aPosition >> mSegmentSizeLog2;}
      95            8984 :     PRUint32 SegOffset(PRUint32 aPosition) {return aPosition & (mSegmentSize - 1);}
      96                 : };
      97                 : 
      98                 : #endif //  _nsStorageStream_h_

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