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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 ***** */
+
+#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__