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GH-128131: Completely support random read access of uncompressed unencrypted files in ZipFile (#128143)

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Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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5ec1cff 2025-01-21 02:04:43 +08:00 • committed by GitHub
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3 changed files with 88 additions and 1 deletions
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Lib/zipfile/__init__.py
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@ -1184,13 +1184,15 @@ class ZipExtFile(io.BufferedIOBase):
self._offset = buff_offset
read_offset = 0
# Fast seek uncompressed unencrypted file
elif self._compress_type == ZIP_STORED and self._decrypter is None and read_offset > 0:
elif self._compress_type == ZIP_STORED and self._decrypter is None and read_offset != 0:
# disable CRC checking after first seeking - it would be invalid
self._expected_crc = None
# seek actual file taking already buffered data into account
read_offset -= len(self._readbuffer) - self._offset
self._fileobj.seek(read_offset, os.SEEK_CUR)
self._left -= read_offset
self._compress_left -= read_offset
self._eof = self._left <= 0
read_offset = 0
# flush read buffer
self._readbuffer = b''