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lightning-sunbird  0.9+nobinonly
ipcLockProtocol.cpp
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is Mozilla IPC.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 2002
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Darin Fisher <darin@netscape.com>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include <stdlib.h>
00039 #include <string.h>
00040 #include "prlog.h"
00041 #include "ipcLockProtocol.h"
00042 
00043 //-----------------------------------------------------------------------------
00044 
00045 static inline PRUint8 get_opcode(const PRUint8 *buf)
00046 {
00047     return (buf[0] & 0x0f);
00048 }
00049 
00050 static inline PRUint8 get_flags(const PRUint8 *buf)
00051 {
00052     return (buf[0] & 0xf0) >> 4;
00053 }
00054 
00055 static inline const char *get_key(const PRUint8 *buf)
00056 {
00057     return ((const char *) buf) + 1;
00058 }
00059 
00060 //-----------------------------------------------------------------------------
00061 
00062 PRUint8 *
00063 IPC_FlattenLockMsg(const ipcLockMsg *msg, PRUint32 *bufLen)
00064 {
00065     PRUint32 len = 1                 // header byte
00066                  + strlen(msg->key)  // key
00067                  + 1;                // null terminator
00068 
00069     PRUint8 *buf = (PRUint8 *) ::operator new(len);
00070     if (!buf)
00071         return NULL;
00072 
00073     buf[0] = (msg->opcode | (msg->flags << 4));
00074 
00075     memcpy(&buf[1], msg->key, len - 1);
00076     *bufLen = len;
00077     return buf;
00078 }
00079 
00080 void
00081 IPC_UnflattenLockMsg(const PRUint8 *buf, PRUint32 bufLen, ipcLockMsg *msg)
00082 {
00083     PR_ASSERT(bufLen > 2); // malformed buffer otherwise
00084     msg->opcode = get_opcode(buf);
00085     msg->flags = get_flags(buf);
00086     msg->key = get_key(buf);
00087 }