loplugin:useuniqueptr in HWPFile

Change-Id: I0eb3f09b5ca82ce4810aafbb7d5d53f1faa00e3f
Reviewed-on: https://gerrit.libreoffice.org/60111
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

hwpfilter/source/drawing.h

@@ -626,12 +626,12 @@ static HWPPara *LoadParaList()
         return nullptr;
 
     HWPFile *hwpf = GetCurrentDoc();
-    HIODev *hio = hwpf->SetIODevice(hmem);
+    std::unique_ptr<HIODev> hio = hwpf->SetIODevice(std::unique_ptr<HIODev>(hmem));
 
     std::vector< HWPPara* > plist;
 
     hwpf->ReadParaList(plist);
-    hwpf->SetIODevice(hio);
+    hwpf->SetIODevice(std::move(hio));
 
     return plist.size()? plist.front() : nullptr;
 }

hwpfilter/source/hwpfile.cxx

@@ -94,17 +94,14 @@ int detect_hwp_version(const char *str)
 
 int HWPFile::Open(std::unique_ptr<HStream> stream)
 {
-    HStreamIODev *hstreamio = new HStreamIODev(std::move(stream));
+    std::unique_ptr<HStreamIODev> hstreamio(new HStreamIODev(std::move(stream)));
 
     if (!hstreamio->open())
     {
-        delete hstreamio;
-
         return SetState(HWP_EMPTY_FILE);
     }
 
-    HIODev *pPrev = SetIODevice(hstreamio);
-    delete pPrev;
+    SetIODevice(std::move(hstreamio));
 
     char idstr[HWPIDLen];
 
@@ -185,13 +182,10 @@ void HWPFile::SetCompressed(bool flag)
 }
 
 
-HIODev *HWPFile::SetIODevice(HIODev * new_hiodev)
+std::unique_ptr<HIODev> HWPFile::SetIODevice(std::unique_ptr<HIODev> new_hiodev)
 {
-    HIODev *old_hiodev = hiodev.release();
-
-    hiodev.reset( new_hiodev );
-
-    return old_hiodev;
+    std::swap(hiodev, new_hiodev);
+    return new_hiodev;
 }
 
 

hwpfilter/source/hwpfile.h

@@ -165,7 +165,7 @@ class DLLEXPORT HWPFile
 /**
  * Sets current HIODev
  */
-        HIODev *SetIODevice( HIODev *hiodev );
+        std::unique_ptr<HIODev> SetIODevice( std::unique_ptr<HIODev> hiodev );
 
 /**
  * Reads all information of hwp file from stream