1 files changed, 99 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/ipc/ipcd/util/public/ipcMessageWriter.h b/src/libs/xpcom18a4/ipc/ipcd/util/public/ipcMessageWriter.h
new file mode 100644
index 00000000..8e0a8178
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+++ b/src/libs/xpcom18a4/ipc/ipcd/util/public/ipcMessageWriter.h
@@ -0,0 +1,99 @@
+/* -*- 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__