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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:49:04 +0000
commit16f504a9dca3fe3b70568f67b7d41241ae485288 (patch)
treec60f36ada0496ba928b7161059ba5ab1ab224f9d /src/libs/xpcom18a4/xpcom/ds/nsAutoBuffer.h
parentInitial commit. (diff)
downloadvirtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.tar.xz
virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.zip
Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/ds/nsAutoBuffer.h')
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is auto buffer template.
+ *
+ * The Initial Developer of the Original Code is
+ * Conrad Carlen <ccarlen@mac.com>.
+ * Portions created by the Initial Developer are Copyright (C) 2004
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Jungshik Shin <jshin@mailaps.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsAutoBuffer_h__
+#define nsAutoBuffer_h__
+
+#ifndef nsMemory_h__
+#include "nsMemory.h"
+#endif
+
+/**
+ * A buffer which will use stack space if the requested size will
+ * fit in the stack buffer and allocate from the heap if not.
+ *
+ * Below is a usage example :
+ *
+ * typedef nsAutoBuffer<PRUnichar, 256> nsAutoUnicharBuffer;
+ *
+ * nsAutoUnicharBuffer buffer;
+ *
+ * if (!buffer.EnsureElemCapacity(initialLength))
+ * return NS_ERROR_OUT_OF_MEMORY;
+ *
+ * PRUnichar *unicharPtr = buffer.get();
+ *
+ * // add PRUnichar's to the buffer pointed to by |unicharPtr| as long as
+ * // the number of PRUnichar's is less than |intialLength|
+ *
+ * // increase the capacity
+ * if (!buffer.AddElemCapacity(extraLength))
+ * return NS_ERROR_OUT_OF_MEMORY
+ *
+ * unicharPtr = buffer.get() + initialLength;
+ *
+ * //continue to add PRUnichar's....
+ */
+
+template <class T, PRInt32 sz>
+class nsAutoBuffer
+{
+public:
+ nsAutoBuffer() :
+ mBufferPtr(mStackBuffer),
+ mCurElemCapacity(sz)
+ {
+ }
+
+ ~nsAutoBuffer()
+ {
+ if (mBufferPtr != mStackBuffer)
+ nsMemory::Free(mBufferPtr);
+ }
+
+ PRBool EnsureElemCapacity(PRInt32 inElemCapacity)
+ {
+ if (inElemCapacity <= mCurElemCapacity)
+ return PR_TRUE;
+
+ T* newBuffer;
+
+ if (mBufferPtr != mStackBuffer)
+ newBuffer = (T*)nsMemory::Realloc((void *)mBufferPtr, inElemCapacity * sizeof(T));
+ else
+ newBuffer = (T*)nsMemory::Alloc(inElemCapacity * sizeof(T));
+
+ if (!newBuffer)
+ return PR_FALSE;
+
+ if (mBufferPtr != mStackBuffer)
+ nsMemory::Free(mBufferPtr);
+
+ mBufferPtr = newBuffer;
+ mCurElemCapacity = inElemCapacity;
+ return PR_TRUE;
+ }
+
+ PRBool AddElemCapacity(PRInt32 inElemCapacity)
+ {
+ return EnsureElemCapacity(mCurElemCapacity + inElemCapacity);
+ }
+
+ T* get() const { return mBufferPtr; }
+ PRInt32 GetElemCapacity() const { return mCurElemCapacity; }
+
+protected:
+
+ T *mBufferPtr;
+ T mStackBuffer[sz];
+ PRInt32 mCurElemCapacity;
+};
+
+#endif // nsAutoBuffer_h__