зеркало из https://github.com/mozilla/gecko-dev.git
100 строки
3.8 KiB
C++
100 строки
3.8 KiB
C++
/* -*- 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 ***** */
|
|
|
|
#ifndef ipcMessageWriter_h__
|
|
#define ipcMessageWriter_h__
|
|
|
|
#include "prtypes.h"
|
|
|
|
//*****************************************************************************
|
|
// ipcMessageWriter
|
|
//
|
|
// Creates a block of memory and resizes it in order to hold writes. The
|
|
// block will be freed when this object is destroyed. Bytes are written in
|
|
// native endianess, as ipcMessageReader reads them in native endianess.
|
|
//*****************************************************************************
|
|
|
|
class ipcMessageWriter
|
|
{
|
|
public:
|
|
ipcMessageWriter(PRUint32 initialCapacity) :
|
|
mBuf(NULL),
|
|
mBufPtr(NULL), mBufEnd(NULL),
|
|
mCapacity(0),
|
|
mError(PR_FALSE)
|
|
{
|
|
EnsureCapacity(initialCapacity);
|
|
}
|
|
|
|
~ipcMessageWriter();
|
|
|
|
// Returns PR_TRUE if an error has occured at any point
|
|
// during the lifetime of this object, due to the buffer
|
|
// not being able to be grown to the required size.
|
|
PRBool HasError()
|
|
{ return mError; }
|
|
|
|
void PutInt8(PRUint8 val);
|
|
void PutInt16(PRUint16 val);
|
|
void PutInt32(PRUint32 val);
|
|
PRUint32 PutBytes(const void* src, PRUint32 n);
|
|
|
|
// Returns the beginning of the buffer. Do not free this.
|
|
PRUint8* GetBuffer()
|
|
{ return mBuf; }
|
|
|
|
PRInt32 GetSize()
|
|
{ return mBufPtr - mBuf; }
|
|
|
|
private:
|
|
PRBool EnsureCapacity(PRInt32 sizeNeeded)
|
|
{
|
|
return (mBuf && ((mBufPtr + sizeNeeded) <= mBufEnd)) ?
|
|
PR_TRUE : GrowCapacity(sizeNeeded);
|
|
}
|
|
PRBool GrowCapacity(PRInt32 sizeNeeded);
|
|
|
|
private:
|
|
PRUint8 *mBuf;
|
|
PRUint8 *mBufPtr, *mBufEnd;
|
|
PRInt32 mCapacity;
|
|
PRBool mError;
|
|
};
|
|
|
|
#endif // ipcMessageWriter_h__
|