always delete incompletely downloaded files

gallery_dl/downloader/common.py

@@ -19,16 +19,14 @@ class BasicDownloader():
     def download(self, url, pathfmt):
         """Download the resource at 'url' and write it to a file-like object"""
         try:
-            return self.download_impl(url, pathfmt)
-        except:
-            # remove file if download failed
-            try:
-                if self.downloading:
-                    os.unlink(pathfmt.realpath)
-            except (AttributeError, FileNotFoundError):
-                pass
-            raise
+            self.download_impl(url, pathfmt)
+        finally:
+            # remove file from incomplete downloads
+            if self.downloading:
+                try:
+                    os.remove(pathfmt.realpath)
+                except (OSError, AttributeError):
+                    pass
 
     def download_impl(self, url, file_handle):
         """Actual implementaion of the download process"""
-        pass

gallery_dl/downloader/http.py

@@ -72,14 +72,14 @@ class Downloader(BasicDownloader):
             # everything ok -- proceed to download
             self.out.start(pathfmt.path)
             self.downloading = True
-            with pathfmt.open() as file:
-                try:
-                    for data in response.iter_content(None):
+            try:
+                with pathfmt.open() as file:
+                    for data in response.iter_content(16384):
                         file.write(data)
-                except rexcepts.RequestException as exception:
-                    msg = exception
-                    response.close()
-                    continue
+            except rexcepts.RequestException as exception:
+                msg = exception
+                response.close()
+                continue
             self.downloading = False
             self.out.success(pathfmt.path, tries)
             return