0050990907
r/sr=leaf+darin git-svn-id: svn://10.0.0.236/trunk@148982 18797224-902f-48f8-a5cc-f745e15eee43
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla IPC.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Conrad Carlen <ccarlen@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "ipcMessageReader.h"
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#include <string.h>
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//*****************************************************************************
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// ipcMessageReader
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//*****************************************************************************
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PRUint8 ipcMessageReader::GetInt8()
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{
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if (mBufPtr < mBufEnd)
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return *mBufPtr++;
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mError = PR_TRUE;
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return 0;
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}
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// GetInt16 and GetInt32 go to pains to avoid unaligned memory accesses that
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// are larger than a byte. On some platforms, that causes a performance penalty.
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// On other platforms, Tru64 for instance, it's an error.
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PRUint16 ipcMessageReader::GetInt16()
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{
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if (mBufPtr + sizeof(PRUint16) <= mBufEnd) {
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PRUint8 temp[2] = { mBufPtr[0], mBufPtr[1] };
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mBufPtr += sizeof(PRUint16);
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return *(PRUint16*)temp;
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}
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mError = PR_TRUE;
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return 0;
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}
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PRUint32 ipcMessageReader::GetInt32()
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{
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if (mBufPtr + sizeof(PRUint32) <= mBufEnd) {
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PRUint8 temp[4] = { mBufPtr[0], mBufPtr[1], mBufPtr[2], mBufPtr[3] };
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mBufPtr += sizeof(PRUint32);
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return *(PRUint32*)temp;
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}
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mError = PR_TRUE;
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return 0;
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}
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PRInt32 ipcMessageReader::GetBytes(void* destBuffer, PRInt32 n)
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{
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if (mBufPtr + n <= mBufEnd) {
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memcpy(destBuffer, mBufPtr, n);
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mBufPtr += n;
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return n;
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}
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mError = PR_TRUE;
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return 0;
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}
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PRBool ipcMessageReader::AdvancePtr(PRInt32 n)
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{
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const PRUint8 *newPtr = mBufPtr + n;
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if (newPtr >= mBuf && newPtr <= mBufEnd) {
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mBufPtr = newPtr;
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return PR_TRUE;
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}
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mError = PR_TRUE;
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return PR_FALSE;
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}
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