mirror of
https://github.com/rn10950/RetroZilla.git
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100 lines
3.8 KiB
C++
100 lines
3.8 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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#ifndef ipcMessageWriter_h__
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#define ipcMessageWriter_h__
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#include "prtypes.h"
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//*****************************************************************************
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// ipcMessageWriter
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//
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// Creates a block of memory and resizes it in order to hold writes. The
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// block will be freed when this object is destroyed. Bytes are written in
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// native endianess, as ipcMessageReader reads them in native endianess.
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//*****************************************************************************
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class ipcMessageWriter
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{
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public:
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ipcMessageWriter(PRUint32 initialCapacity) :
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mBuf(NULL),
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mBufPtr(NULL), mBufEnd(NULL),
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mCapacity(0),
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mError(PR_FALSE)
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{
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EnsureCapacity(initialCapacity);
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}
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~ipcMessageWriter();
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// Returns PR_TRUE if an error has occured at any point
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// during the lifetime of this object, due to the buffer
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// not being able to be grown to the required size.
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PRBool HasError()
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{ return mError; }
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void PutInt8(PRUint8 val);
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void PutInt16(PRUint16 val);
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void PutInt32(PRUint32 val);
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PRUint32 PutBytes(const void* src, PRUint32 n);
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// Returns the beginning of the buffer. Do not free this.
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PRUint8* GetBuffer()
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{ return mBuf; }
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PRInt32 GetSize()
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{ return mBufPtr - mBuf; }
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private:
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PRBool EnsureCapacity(PRInt32 sizeNeeded)
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{
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return (mBuf && ((mBufPtr + sizeNeeded) <= mBufEnd)) ?
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PR_TRUE : GrowCapacity(sizeNeeded);
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}
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PRBool GrowCapacity(PRInt32 sizeNeeded);
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private:
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PRUint8 *mBuf;
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PRUint8 *mBufPtr, *mBufEnd;
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PRInt32 mCapacity;
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PRBool mError;
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};
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#endif // ipcMessageWriter_h__
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