def get_cover(opf, opf_path, stream, reader=None):
raster_cover = opf.raster_cover
stream.seek(0)
try:
zf = ZipFile(stream)
except:
stream.seek(0)
zf = LocalZipFile(stream)
if raster_cover:
base = posixpath.dirname(opf_path)
cpath = posixpath.normpath(posixpath.join(base, raster_cover))
if reader is not None and \
reader.encryption_meta.is_encrypted(cpath):
return
try:
member = zf.getinfo(cpath)
except:
pass
else:
f = zf.open(member)
data = f.read()
f.close()
zf.close()
return data
return render_cover(opf, opf_path, zf, reader=reader)
