michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsManifestLineReader_h__
michael@0: #define nsManifestLineReader_h__
michael@0: 
michael@0: #include "nspr.h"
michael@0: #include "nsDebug.h"
michael@0: 
michael@0: class nsManifestLineReader
michael@0: {
michael@0: public:
michael@0:     nsManifestLineReader() : mBase(nullptr) {} 
michael@0:     ~nsManifestLineReader() {}
michael@0: 
michael@0:     void Init(char* base, uint32_t flen) 
michael@0:     {
michael@0:         mBase = mCur = mNext = base; 
michael@0:         mLength = 0;
michael@0:         mLimit = base + flen;
michael@0:     }
michael@0: 
michael@0:     bool NextLine()
michael@0:     {
michael@0:         if(mNext >= mLimit)
michael@0:             return false;
michael@0:         
michael@0:         mCur = mNext;
michael@0:         mLength = 0;
michael@0:         
michael@0:         while(mNext < mLimit)
michael@0:         {
michael@0:             if(IsEOL(*mNext))
michael@0:             {
michael@0:                 *mNext = '\0';
michael@0:                 for(++mNext; mNext < mLimit; ++mNext)
michael@0:                     if(!IsEOL(*mNext))
michael@0:                         break;
michael@0:                 return true;
michael@0:             }
michael@0:             ++mNext;
michael@0:             ++mLength;
michael@0:         }
michael@0:         return false;        
michael@0:     }
michael@0: 
michael@0:     int ParseLine(char** chunks, int* lengths, int maxChunks)
michael@0:     {
michael@0:         NS_ASSERTION(mCur && maxChunks && chunks, "bad call to ParseLine");
michael@0:         int found = 0;
michael@0:         chunks[found++] = mCur;
michael@0: 
michael@0:         if(found < maxChunks)
michael@0:         {
michael@0:             char *lastchunk = mCur;
michael@0:             int *lastlength = lengths;
michael@0:             for(char* cur = mCur; *cur; cur++)
michael@0:             {
michael@0:                 if(*cur == ',')
michael@0:                 {
michael@0:                     *cur = 0;
michael@0:                     // always fill in the previous chunk's length
michael@0:                     *lastlength++ = cur - lastchunk;
michael@0:                     chunks[found++] = lastchunk = cur+1;
michael@0:                     if(found == maxChunks)
michael@0:                         break;
michael@0:                 }
michael@0:             }
michael@0:             // crazy pointer math - calculate the length of the final chunk
michael@0:             *lastlength = (mCur + mLength) - lastchunk;
michael@0:         }
michael@0:         return found;
michael@0:     }
michael@0: 
michael@0:     char*       LinePtr() {return mCur;}    
michael@0:     uint32_t    LineLength() {return mLength;}    
michael@0: 
michael@0:     bool        IsEOL(char c) {return c == '\n' || c == '\r';}
michael@0: private:
michael@0:     char*       mCur;
michael@0:     uint32_t    mLength;
michael@0:     char*       mNext;
michael@0:     char*       mBase;
michael@0:     char*       mLimit;
michael@0: };
michael@0: 
michael@0: #endif