Fix #4958 (Metadata not imported for zipped Mobipocket file)

src/calibre/ebooks/metadata/meta.py

@@ -70,11 +70,14 @@ def is_recipe(filename):
         filename.rpartition('.')[0].endswith('_recipe_out')
 
 def get_metadata(stream, stream_type='lrf', use_libprs_metadata=False):
-    pos = stream.tell()
+    pos = 0
+    if hasattr(stream, 'tell'):
+        pos = stream.tell()
     try:
         return _get_metadata(stream, stream_type, use_libprs_metadata)
     finally:
-        stream.seek(pos)
+        if hasattr(stream, 'seek'):
+            stream.seek(pos)
 
 
 def _get_metadata(stream, stream_type, use_libprs_metadata):

src/calibre/ebooks/metadata/zip.py

@@ -3,9 +3,10 @@ __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
 import os
-from zipfile import ZipFile
-from cStringIO import StringIO
 
+from calibre.utils.zipfile import ZipFile
+from calibre.ptempfile import TemporaryDirectory
+from calibre import CurrentDir
 
 def get_metadata(stream):
     from calibre.ebooks.metadata.meta import get_metadata
@@ -23,8 +24,10 @@ def get_metadata(stream):
             stream_type = stream_type[1:]
             if stream_type in ('lit', 'opf', 'prc', 'mobi', 'fb2', 'epub',
                                'rb', 'imp', 'pdf', 'lrf'):
-                stream = StringIO(zf.read(f))
-                return get_metadata(stream, stream_type)
+                with TemporaryDirectory() as tdir:
+                    with CurrentDir(tdir):
+                        path = zf.extract(f)
+                        return get_metadata(open(path, 'rb'), stream_type)
     raise ValueError('No ebook found in ZIP archive')
 
 

src/calibre/ebooks/mobi/reader.py

@@ -795,8 +795,7 @@ class MobiReader(object):
 
 def get_metadata(stream):
     from calibre.utils.logging import Log
-    log = Log()
-
+    log = Log(level=Log.DEBUG)
     mi = MetaInformation(os.path.basename(stream.name), [_('Unknown')])
     try:
         mh = MetadataHeader(stream, log)
@@ -823,5 +822,5 @@ def get_metadata(stream):
         im.convert('RGBA').save(obuf, format='JPEG')
         mi.cover_data = ('jpg', obuf.getvalue())
     except:
-        log.exception()
+        log.exception('Failed to read MOBI metadata')
     return mi