LCOV - code coverage report
Current view: directory - js/xpconnect/src - XPCString.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 26 22 84.6 %
Date: 2012-06-02 Functions: 2 2 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 8; 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 Mozilla Communicator client code, released
      17                 :  * March 31, 1998.
      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                 :  *   Mike Shaver <shaver@mozilla.org>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      29                 :  * or 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                 :  * Infrastructure for sharing DOMString data with JSStrings.
      43                 :  *
      44                 :  * Importing an nsAString into JS:
      45                 :  * If possible (GetSharedBufferHandle works) use the external string support in
      46                 :  * JS to create a JSString that points to the readable's buffer.  We keep a
      47                 :  * reference to the buffer handle until the JSString is finalized.
      48                 :  *
      49                 :  * Exporting a JSString as an nsAReadable:
      50                 :  * Wrap the JSString with a root-holding XPCJSReadableStringWrapper, which roots
      51                 :  * the string and exposes its buffer via the nsAString interface, as
      52                 :  * well as providing refcounting support.
      53                 :  */
      54                 : 
      55                 : #include "xpcprivate.h"
      56                 : #include "nsStringBuffer.h"
      57                 : 
      58                 : static void
      59          103647 : FinalizeDOMString(const JSStringFinalizer *fin, jschar *chars)
      60                 : {
      61          103647 :     nsStringBuffer::FromData(chars)->Release();
      62          103647 : }
      63                 : 
      64                 : static const JSStringFinalizer sDOMStringFinalizer = { FinalizeDOMString };
      65                 : 
      66                 : 
      67                 : // convert a readable to a JSString, copying string data
      68                 : // static
      69                 : jsval
      70         1372151 : XPCStringConvert::ReadableToJSVal(JSContext *cx,
      71                 :                                   const nsAString &readable,
      72                 :                                   nsStringBuffer** sharedBuffer)
      73                 : {
      74                 :     JSString *str;
      75         1372151 :     *sharedBuffer = nsnull;
      76                 : 
      77         1372151 :     PRUint32 length = readable.Length();
      78                 : 
      79         1372151 :     if (length == 0)
      80            8873 :         return JS_GetEmptyStringValue(cx);
      81                 : 
      82         1363278 :     nsStringBuffer *buf = nsStringBuffer::FromString(readable);
      83         1363278 :     if (buf) {
      84                 :         // yay, we can share the string's buffer!
      85                 : 
      86                 :         str = JS_NewExternalString(cx,
      87          103647 :                                    reinterpret_cast<jschar *>(buf->Data()),
      88          103647 :                                    length, &sDOMStringFinalizer);
      89                 : 
      90          103647 :         if (str) {
      91          103647 :             *sharedBuffer = buf;
      92                 :         }
      93                 :     } else {
      94                 :         // blech, have to copy.
      95                 : 
      96                 :         jschar *chars = reinterpret_cast<jschar *>
      97                 :                                         (JS_malloc(cx, (length + 1) *
      98         1259631 :                                                    sizeof(jschar)));
      99         1259631 :         if (!chars)
     100               0 :             return JSVAL_NULL;
     101                 : 
     102         2519262 :         if (length && !CopyUnicodeTo(readable, 0,
     103                 :                                      reinterpret_cast<PRUnichar *>(chars),
     104         1259631 :                                      length)) {
     105               0 :             JS_free(cx, chars);
     106               0 :             return JSVAL_NULL;
     107                 :         }
     108                 : 
     109         1259631 :         chars[length] = 0;
     110                 : 
     111         1259631 :         str = JS_NewUCString(cx, chars, length);
     112         1259631 :         if (!str)
     113               0 :             JS_free(cx, chars);
     114                 :     }
     115         1363278 :     return str ? STRING_TO_JSVAL(str) : JSVAL_NULL;
     116                 : }

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