xpcom/ds/nsUnicharBuffer.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   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  *   Pierre Phaneuf <pp@ludusdesign.com>
  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
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  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 #include "nsUnicharBuffer.h"
  40 #include "nsCRT.h"
  41
  42 #define MIN_BUFFER_SIZE 32
  43
  44 UnicharBufferImpl::UnicharBufferImpl()
  45   : mBuffer(NULL), mSpace(0), mLength(0)
  46 {
  47 }
  48
  49 NS_METHOD
  50 UnicharBufferImpl::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
  51 {
  52   if (aOuter)
  53     return NS_ERROR_NO_AGGREGATION;
  54
  55   UnicharBufferImpl* it = new UnicharBufferImpl();
  56   if (it == nsnull)
  57     return NS_ERROR_OUT_OF_MEMORY;
  58
  59   NS_ADDREF(it);
  60   nsresult rv = it->QueryInterface(aIID, aResult);
  61   NS_RELEASE(it);
  62   return rv;
  63 }
  64
  65 NS_IMETHODIMP
  66 UnicharBufferImpl::Init(PRUint32 aBufferSize)
  67 {
  68   if (aBufferSize < MIN_BUFFER_SIZE) {
  69     aBufferSize = MIN_BUFFER_SIZE;
  70   }
  71   mSpace = aBufferSize;
  72   mLength = 0;
  73   mBuffer = new PRUnichar[aBufferSize];
  74   return mBuffer ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
  75 }
  76
  77 NS_IMPL_ISUPPORTS1(UnicharBufferImpl, nsIUnicharBuffer)
  78
  79 UnicharBufferImpl::~UnicharBufferImpl()
  80 {
  81   if (nsnull != mBuffer) {
  82     delete[] mBuffer;
  83     mBuffer = nsnull;
  84   }
  85   mLength = 0;
  86 }
  87
  88 NS_IMETHODIMP_(PRInt32)
  89 UnicharBufferImpl::GetLength() const
  90 {
  91   return mLength;
  92 }
  93
  94 NS_IMETHODIMP_(PRInt32)
  95 UnicharBufferImpl::GetBufferSize() const
  96 {
  97   return mSpace;
  98 }
  99
 100 NS_IMETHODIMP_(PRUnichar*)
 101 UnicharBufferImpl::GetBuffer() const
 102 {
 103   return mBuffer;
 104 }
 105
 106 NS_IMETHODIMP_(PRBool)
 107 UnicharBufferImpl::Grow(PRInt32 aNewSize)
 108 {
 109   if (PRUint32(aNewSize) < MIN_BUFFER_SIZE) {
 110     aNewSize = MIN_BUFFER_SIZE;
 111   }
 112   PRUnichar* newbuf = new PRUnichar[aNewSize];
 113   if (nsnull != newbuf) {
 114     if (0 != mLength) {
 115       memcpy(newbuf, mBuffer, mLength * sizeof(PRUnichar));
 116     }
 117     delete[] mBuffer;
 118     mBuffer = newbuf;
 119     return PR_TRUE;
 120   }
 121   return PR_FALSE;
 122 }
 123
 124 NS_COM nsresult
 125 NS_NewUnicharBuffer(nsIUnicharBuffer** aInstancePtrResult,
 126                     nsISupports* aOuter,
 127                     PRUint32 aBufferSize)
 128 {
 129   nsresult rv;
 130   nsIUnicharBuffer* buf;
 131   rv = UnicharBufferImpl::Create(aOuter, NS_GET_IID(nsIUnicharBuffer),
 132                                  (void**)&buf);
 133   if (NS_FAILED(rv)) return rv;
 134   rv = buf->Init(aBufferSize);
 135   if (NS_FAILED(rv)) {
 136     NS_RELEASE(buf);
 137     return rv;
 138   }
 139   *aInstancePtrResult = buf;
 140   return rv;
 141 }