use malloc instead of new[] in pkgTagFile

We don't need initialized memory for pkgTagFile, but more to the point
we can use realloc this way which hides the bloody details of increasing
the size of the buffer used.

Git-Dch: Ignore

apt-pkg/tagfile.cc

@@ -58,18 +58,19 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size)
    d = new pkgTagFilePrivate(pFd, Size);
 
    if (d->Fd.IsOpen() == false)
-   {
       d->Start = d->End = d->Buffer = 0;
+   else
+      d->Buffer = (char*)malloc(sizeof(char) * Size);
+
+   if (d->Buffer == NULL)
       d->Done = true;
-      d->iOffset = 0;
-      return;
-   }
-   
-   d->Buffer = new char[Size];
+   else
+      d->Done = false;
+
    d->Start = d->End = d->Buffer;
-   d->Done = false;
    d->iOffset = 0;
-   Fill();
+   if (d->Done == false)
+      Fill();
 }
 									/*}}}*/
 // TagFile::~pkgTagFile - Destructor					/*{{{*/
@@ -77,11 +78,11 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size)
 /* */
 pkgTagFile::~pkgTagFile()
 {
-   delete [] d->Buffer;
+   free(d->Buffer);
    delete d;
 }
 									/*}}}*/
-// TagFile::Offset - Return the current offset in the buffer     	/*{{{*/
+// TagFile::Offset - Return the current offset in the buffer		/*{{{*/
 unsigned long pkgTagFile::Offset()
 {
    return d->iOffset;
@@ -103,14 +104,13 @@ bool pkgTagFile::Resize()
 bool pkgTagFile::Resize(unsigned long long const newSize)
 {
    unsigned long long const EndSize = d->End - d->Start;
-   char *tmp;
 
    // get new buffer and use it
-   tmp = new char[newSize];
-   memcpy(tmp, d->Buffer, d->Size);
+   char* newBuffer = (char*)realloc(d->Buffer, sizeof(char) * newSize);
+   if (newBuffer == NULL)
+      return false;
+   d->Buffer = newBuffer;
    d->Size = newSize;
-   delete [] d->Buffer;
-   d->Buffer = tmp;
 
    // update the start/end pointers to the new buffer
    d->Start = d->Buffer;