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nsPluginManifestLineReader.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
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00022  * Contributor(s):
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
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00037 
00038 #ifndef nsPluginManifestLineReader_h__
00039 #define nsPluginManifestLineReader_h__
00040 
00041 #include "nspr.h"
00042 #include "nsDebug.h"
00043 
00044 #ifdef XP_WIN
00045 #define PLUGIN_REGISTRY_FIELD_DELIMITER '|'
00046 #else
00047 #define PLUGIN_REGISTRY_FIELD_DELIMITER ':'
00048 #endif
00049 
00050 #define PLUGIN_REGISTRY_END_OF_LINE_MARKER '$'
00051 
00052 class nsPluginManifestLineReader
00053 {
00054 public:
00055     nsPluginManifestLineReader() {mBase = mCur = mNext = mLimit = 0;} 
00056     ~nsPluginManifestLineReader() { if (mBase) delete[] mBase; mBase=0;}
00057 
00058     char* Init(PRUint32 flen) 
00059     {
00060         mBase = mCur = mNext = new char[flen+1];
00061         if (mBase) {
00062           mLimit = mBase + flen;
00063           *mLimit = 0;
00064         }
00065         mLength = 0;
00066         return mBase;
00067     }
00068 
00069     PRBool NextLine()
00070     {
00071         if(mNext >= mLimit)
00072             return PR_FALSE;
00073         
00074         mCur = mNext;
00075         mLength = 0;
00076         
00077         char *lastDelimiter = 0;
00078         while(mNext < mLimit)
00079         {
00080             if(IsEOL(*mNext))
00081             {
00082                 if(lastDelimiter)
00083                 {
00084                     if(lastDelimiter && *(mNext - 1) != PLUGIN_REGISTRY_END_OF_LINE_MARKER)
00085                         return PR_FALSE;
00086                     *lastDelimiter = '\0';
00087                 } else
00088                     *mNext = '\0';
00089 
00090                 for(++mNext; mNext < mLimit; ++mNext)
00091                     if(!IsEOL(*mNext))
00092                         break;
00093                 return PR_TRUE;
00094             }
00095             if(*mNext == PLUGIN_REGISTRY_FIELD_DELIMITER)
00096                 lastDelimiter = mNext;
00097             ++mNext;
00098             ++mLength;
00099         }
00100         return PR_FALSE;        
00101     }
00102 
00103     int ParseLine(char** chunks, int maxChunks)
00104     {
00105         NS_ASSERTION(mCur && maxChunks && chunks, "bad call to ParseLine");
00106         int found = 0;
00107         chunks[found++] = mCur;
00108         
00109         if(found < maxChunks)
00110         {
00111             for(char* cur = mCur; *cur; cur++)
00112             {
00113                 if(*cur == PLUGIN_REGISTRY_FIELD_DELIMITER)
00114                 {
00115                     *cur = 0;
00116                     chunks[found++] = cur+1;
00117                     if(found == maxChunks)
00118                         break;
00119                 }
00120             }
00121         }
00122         return found;
00123     }
00124 
00125     char*       LinePtr() {return mCur;}    
00126     PRUint32    LineLength() {return mLength;}    
00127 
00128     PRBool      IsEOL(char c) {return c == '\n' || c == '\r';}
00129 
00130     char*       mBase;
00131 private:
00132     char*       mCur;
00133     PRUint32    mLength;
00134     char*       mNext;
00135     char*       mLimit;
00136 };
00137 
00138 #endif