Move jpeg-specific eof-processing to jpeg plugin

src/PIL/ImageFile.py

@@ -221,7 +221,7 @@ class ImageFile(Image.Image):
 
                             if not s:  # truncated jpeg
                                 if LOAD_TRUNCATED_IMAGES:
-                                    s = b"\xFF\xD9"  # Pretend file is finished adding EOI marker
+                                    break
                                 else:
                                     self.tile = []
                                     raise IOError("image file is truncated "

src/PIL/JpegImagePlugin.py

@@ -353,6 +353,21 @@ class JpegImageFile(ImageFile.ImageFile):
             else:
                 raise SyntaxError("no marker found")
 
+    def load_read(self, read_bytes):
+        """
+        internal: read more image data
+        For premature EOF and LOAD_TRUNCATED_IMAGES adds EOI marker
+        so libjpeg can finish decoding
+        """
+        s = self.fp.read(read_bytes)
+
+        if not s and ImageFile.LOAD_TRUNCATED_IMAGES:
+            # Premature EOF.
+            # Pretend file is finished adding EOI marker
+            return b"\xFF\xD9"
+
+        return s
+
     def draft(self, mode, size):
 
         if len(self.tile) != 1: