LCOV - code coverage report
Current view: directory - xpcom/io - nsScriptableInputStream.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 56 54 96.4 %
Date: 2012-06-02 Functions: 9 9 100.0 %

       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.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "nsScriptableInputStream.h"
      39                 : #include "nsMemory.h"
      40                 : #include "nsString.h"
      41                 : 
      42           48068 : NS_IMPL_ISUPPORTS1(nsScriptableInputStream, nsIScriptableInputStream)
      43                 : 
      44                 : // nsIScriptableInputStream methods
      45                 : NS_IMETHODIMP
      46              74 : nsScriptableInputStream::Close(void) {
      47              74 :     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
      48              74 :     return mInputStream->Close();
      49                 : }
      50                 : 
      51                 : NS_IMETHODIMP
      52            2614 : nsScriptableInputStream::Init(nsIInputStream *aInputStream) {
      53            2614 :     if (!aInputStream) return NS_ERROR_NULL_POINTER;
      54            2614 :     mInputStream = aInputStream;
      55            2614 :     return NS_OK;
      56                 : }
      57                 : 
      58                 : NS_IMETHODIMP
      59             103 : nsScriptableInputStream::Available(PRUint32 *_retval) {
      60             103 :     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
      61             103 :     return mInputStream->Available(_retval);
      62                 : }
      63                 : 
      64                 : NS_IMETHODIMP
      65            1893 : nsScriptableInputStream::Read(PRUint32 aCount, char **_retval) {
      66            1893 :     nsresult rv = NS_OK;
      67            1893 :     PRUint32 count = 0;
      68            1893 :     char *buffer = nsnull;
      69                 : 
      70            1893 :     if (!mInputStream) return NS_ERROR_NOT_INITIALIZED;
      71                 : 
      72            1893 :     rv = mInputStream->Available(&count);
      73            1893 :     if (NS_FAILED(rv)) return rv;
      74                 : 
      75                 :     // bug716556 - Ensure count+1 doesn't overflow
      76            1891 :     count = NS_MIN(NS_MIN(count, aCount), PR_UINT32_MAX - 1);
      77            1891 :     buffer = (char*)nsMemory::Alloc(count+1); // make room for '\0'
      78            1891 :     if (!buffer) return NS_ERROR_OUT_OF_MEMORY;
      79                 : 
      80            1891 :     PRUint32 amtRead = 0;
      81            1891 :     rv = mInputStream->Read(buffer, count, &amtRead);
      82            1891 :     if (NS_FAILED(rv)) {
      83               1 :         nsMemory::Free(buffer);
      84               1 :         return rv;
      85                 :     }
      86                 : 
      87            1890 :     buffer[amtRead] = '\0';
      88            1890 :     *_retval = buffer;
      89            1890 :     return NS_OK;
      90                 : }
      91                 : 
      92                 : NS_IMETHODIMP
      93             774 : nsScriptableInputStream::ReadBytes(PRUint32 aCount, nsACString &_retval) {
      94             774 :     if (!mInputStream) {
      95               0 :       return NS_ERROR_NOT_INITIALIZED;
      96                 :     }
      97                 : 
      98             774 :     _retval.SetLength(aCount);
      99             774 :     if (_retval.Length() != aCount) {
     100               0 :       return NS_ERROR_OUT_OF_MEMORY;
     101                 :     }
     102                 : 
     103             774 :     char *ptr = _retval.BeginWriting();
     104             774 :     PRUint32 totalBytesRead = 0;
     105               1 :     while (1) {
     106                 :       PRUint32 bytesRead;
     107             775 :       nsresult rv = mInputStream->Read(ptr + totalBytesRead,
     108                 :                                        aCount - totalBytesRead,
     109             775 :                                        &bytesRead);
     110             775 :       if (NS_FAILED(rv)) {
     111               1 :         return rv;
     112                 :       }
     113                 : 
     114             774 :       totalBytesRead += bytesRead;
     115             774 :       if (totalBytesRead == aCount) {
     116                 :         break;
     117                 :       }
     118                 : 
     119                 :       // If we have read zero bytes, we have hit EOF.
     120               2 :       if (bytesRead == 0) {
     121               1 :         _retval.Truncate();
     122               1 :         return NS_ERROR_FAILURE;
     123                 :       }
     124                 : 
     125                 :     }
     126             772 :     return NS_OK;
     127                 : }
     128                 : 
     129                 : nsresult
     130            2670 : nsScriptableInputStream::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult) {
     131            2670 :     if (aOuter) return NS_ERROR_NO_AGGREGATION;
     132                 : 
     133            2670 :     nsScriptableInputStream *sis = new nsScriptableInputStream();
     134            2670 :     if (!sis) return NS_ERROR_OUT_OF_MEMORY;
     135                 : 
     136            2670 :     NS_ADDREF(sis);
     137            2670 :     nsresult rv = sis->QueryInterface(aIID, aResult);
     138            2670 :     NS_RELEASE(sis);
     139            2670 :     return rv;
     140                 : }

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