made bs4 and soupsieve standalone in this project

markdown2html.py

@@ -194,13 +194,19 @@ def get_image_size(fhandle, pathlike):
                 fhandle.seek(size, 1)
                 byte = fhandle.read(1)
                 if byte == b"":
-                    fhandle = end
-                    byte = fhandle.read(1)
-
+                    # Reached end of file unexpectedly, break the loop
+                    break
                 while ord(byte) == 0xFF:
                     byte = fhandle.read(1)
+                    if byte == b"": # Check EOF in inner loop too
+                        break
+                if byte == b"": # Break outer loop if inner loop hit EOF
+                    break
                 ftype = ord(byte)
                 size = struct.unpack(">H", fhandle.read(2))[0] - 2
+            # Check if the loop exited because of a break (EOF) before finding the marker
+            if not (0xC0 <= ftype <= 0xCF):
+                 return "unknown format {!r}".format(format_)
             # We are at a SOFn block
             fhandle.seek(1, 1)  # Skip `precision' byte.
             height, width = struct.unpack(">HH", fhandle.read(4))