diff -r 000000000000 -r 6474c204b198 xpcom/ds/nsManifestLineReader.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/ds/nsManifestLineReader.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsManifestLineReader_h__
+#define nsManifestLineReader_h__
+
+#include "nspr.h"
+#include "nsDebug.h"
+
+class nsManifestLineReader
+{
+public:
+    nsManifestLineReader() : mBase(nullptr) {} 
+    ~nsManifestLineReader() {}
+
+    void Init(char* base, uint32_t flen) 
+    {
+        mBase = mCur = mNext = base; 
+        mLength = 0;
+        mLimit = base + flen;
+    }
+
+    bool NextLine()
+    {
+        if(mNext >= mLimit)
+            return false;
+        
+        mCur = mNext;
+        mLength = 0;
+        
+        while(mNext < mLimit)
+        {
+            if(IsEOL(*mNext))
+            {
+                *mNext = '\0';
+                for(++mNext; mNext < mLimit; ++mNext)
+                    if(!IsEOL(*mNext))
+                        break;
+                return true;
+            }
+            ++mNext;
+            ++mLength;
+        }
+        return false;        
+    }
+
+    int ParseLine(char** chunks, int* lengths, int maxChunks)
+    {
+        NS_ASSERTION(mCur && maxChunks && chunks, "bad call to ParseLine");
+        int found = 0;
+        chunks[found++] = mCur;
+
+        if(found < maxChunks)
+        {
+            char *lastchunk = mCur;
+            int *lastlength = lengths;
+            for(char* cur = mCur; *cur; cur++)
+            {
+                if(*cur == ',')
+                {
+                    *cur = 0;
+                    // always fill in the previous chunk's length
+                    *lastlength++ = cur - lastchunk;
+                    chunks[found++] = lastchunk = cur+1;
+                    if(found == maxChunks)
+                        break;
+                }
+            }
+            // crazy pointer math - calculate the length of the final chunk
+            *lastlength = (mCur + mLength) - lastchunk;
+        }
+        return found;
+    }
+
+    char*       LinePtr() {return mCur;}    
+    uint32_t    LineLength() {return mLength;}    
+
+    bool        IsEOL(char c) {return c == '\n' || c == '\r';}
+private:
+    char*       mCur;
+    uint32_t    mLength;
+    char*       mNext;
+    char*       mBase;
+    char*       mLimit;
+};
+
+#endif