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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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 Mozilla IPC.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Conrad Carlen <ccarlen@netscape.com>
*
* 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 ***** */
#include "ipcMessageReader.h"
#include <string.h>
//*****************************************************************************
// ipcMessageReader
//*****************************************************************************
PRUint8 ipcMessageReader::GetInt8()
{
if (mBufPtr < mBufEnd)
return *mBufPtr++;
mError = PR_TRUE;
return 0;
}
// GetInt16 and GetInt32 go to pains to avoid unaligned memory accesses that
// are larger than a byte. On some platforms, that causes a performance penalty.
// On other platforms, Tru64 for instance, it's an error.
PRUint16 ipcMessageReader::GetInt16()
{
if (mBufPtr + sizeof(PRUint16) <= mBufEnd) {
PRUint8 temp[2] = { mBufPtr[0], mBufPtr[1] };
mBufPtr += sizeof(PRUint16);
return *(PRUint16*)temp;
}
mError = PR_TRUE;
return 0;
}
PRUint32 ipcMessageReader::GetInt32()
{
if (mBufPtr + sizeof(PRUint32) <= mBufEnd) {
PRUint8 temp[4] = { mBufPtr[0], mBufPtr[1], mBufPtr[2], mBufPtr[3] };
mBufPtr += sizeof(PRUint32);
return *(PRUint32*)temp;
}
mError = PR_TRUE;
return 0;
}
PRInt32 ipcMessageReader::GetBytes(void* destBuffer, PRInt32 n)
{
if (mBufPtr + n <= mBufEnd) {
memcpy(destBuffer, mBufPtr, n);
mBufPtr += n;
return n;
}
mError = PR_TRUE;
return 0;
}
PRBool ipcMessageReader::AdvancePtr(PRInt32 n)
{
const PRUint8 *newPtr = mBufPtr + n;
if (newPtr >= mBuf && newPtr <= mBufEnd) {
mBufPtr = newPtr;
return PR_TRUE;
}
mError = PR_TRUE;
return PR_FALSE;
}
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