120 lines
3.6 KiB
C++
120 lines
3.6 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 "ipcMessageWriter.h"
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#include "prmem.h"
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#include <string.h>
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//*****************************************************************************
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// ipcMessageWriter
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//*****************************************************************************
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ipcMessageWriter::~ipcMessageWriter()
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{
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if (mBuf)
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free(mBuf);
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}
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void ipcMessageWriter::PutInt8(PRUint8 val)
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{
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if (EnsureCapacity(sizeof(PRUint8)))
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*mBufPtr++ = val;
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}
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// PutInt16 and PutInt32 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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void ipcMessageWriter::PutInt16(PRUint16 val)
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{
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if (EnsureCapacity(sizeof(PRUint16))) {
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PRUint8 temp[2];
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*(PRUint16*)temp = val;
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*mBufPtr++ = temp[0];
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*mBufPtr++ = temp[1];
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}
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}
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void ipcMessageWriter::PutInt32(PRUint32 val)
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{
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if (EnsureCapacity(sizeof(PRUint32))) {
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PRUint8 temp[4];
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*(PRUint32*)temp = val;
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*mBufPtr++ = temp[0];
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*mBufPtr++ = temp[1];
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*mBufPtr++ = temp[2];
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*mBufPtr++ = temp[3];
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}
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}
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PRUint32 ipcMessageWriter::PutBytes(const void* src, PRUint32 n)
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{
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if (EnsureCapacity(n)) {
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memcpy(mBufPtr, src, n);
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mBufPtr += n;
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return n;
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}
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return 0;
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}
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PRBool ipcMessageWriter::GrowCapacity(PRInt32 sizeNeeded)
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{
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if (sizeNeeded < 0)
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return PR_FALSE;
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PRInt32 newCapacity = (mBufPtr - mBuf) + sizeNeeded;
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if (mCapacity == 0)
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mCapacity = newCapacity;
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else
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{
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while (newCapacity > mCapacity && (mCapacity << 1) > 0)
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mCapacity <<= 1;
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if (newCapacity > mCapacity) // if we broke out because of rollover
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return PR_FALSE;
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}
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PRInt32 curPos = mBufPtr - mBuf;
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mBuf = (PRUint8*)realloc(mBuf, mCapacity);
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if (!mBuf) {
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mError = PR_TRUE;
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return PR_FALSE;
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}
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mBufPtr = mBuf + curPos;
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mBufEnd = mBuf + mCapacity;
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return PR_TRUE;
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}
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