def get_file_content(self, meta):
if not isinstance(meta, Metadata):
raise ArkError("Expected Metadata instance, not %s"
% meta.__class__.__name__)
self._file.seek(meta.file_location, os.SEEK_SET)
read_size = meta.size
data = read_or_raise(self._file, read_size)
if meta.encrypted_nbytes:
data = xxtea.decrypt(data, self.passwd)
if meta.compressed_size != meta.original_filesize:
data = zlib.decompress(data)
return data[:meta.original_filesize]
def _get_metadata(self):
self._file.seek(self.metadata_offset, os.SEEK_SET)
size = self.file_count * ArkManager.METADATA_SIZE
if size & 3:
size &= ~3
size += 4
data = read_or_raise(self._file, size)
data = xxtea.decrypt(data, self.passwd)
try:
self.metadatas = [Metadata(data[i:i + ArkManager.METADATA_SIZE])
for i in range(0, size, ArkManager.METADATA_SIZE)]
except:
raise ArkError("Unable to decrypt metadatas, bad password or corrupted file")
