57 lines
2.5 KiB
Python
57 lines
2.5 KiB
Python
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# Copyright (C) 2021 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import unittest
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import io
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import ota_utils
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import zipfile
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class TestZipEntryOffset(unittest.TestCase):
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def test_extra_length_differ(self):
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# This is a magic zip file such that:
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# 1. It has 1 entry, `file.txt'`
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# 2. The central directory entry for the entry contains an extra field of#
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# length 24, while the local file header for the entry contains an extra#
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# field of length 28.
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# It is key that the entry contains extra field of different length.
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# The sole purpose of this test case is make sure our offset computing
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# logic works in this scenario.
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# This is created by:
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# touch file.txt
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# zip -0 test.zip file.txt
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# Above command may or may not work on all platforms.
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# Some zip implementation will keep the extra field size consistent.
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# Some don't
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magic_zip = b'PK\x03\x04\n\x00\x00\x00\x00\x00nY\xfcR\x00\x00\x00\x00\x00\x00\x00' +\
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b'\x00\x00\x00\x00\x00\x08\x00\x1c\x00file.txtUT\t\x00\x03' +\
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b'\xa0s\x01a\xa0s\x01aux\x0b\x00\x01\x04\x88\xc4\t\x00\x04S_\x01\x00' +\
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b'PK\x01\x02\x1e\x03\n\x00\x00\x00\x00\x00nY\xfcR\x00\x00\x00\x00' +\
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b'\x00\x00\x00\x00\x00\x00\x00\x00\x08\x00\x18\x00\x00\x00\x00\x00' +\
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b'\x00\x00\x00\x00\x80\x81\x00\x00\x00\x00file.txt' +\
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b'UT\x05\x00\x03\xa0s\x01aux\x0b\x00\x01\x04\x88\xc4\t\x00\x04' +\
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b'S_\x01\x00PK\x05\x06\x00\x00\x00\x00\x01\x00\x01\x00N\x00\x00' +\
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b'\x00B\x00\x00\x00\x00\x00'
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# Just making sure we concatenated the bytes correctly
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self.assertEqual(len(magic_zip), 166)
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fp = io.BytesIO(magic_zip)
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with zipfile.ZipFile(fp, 'r') as zfp:
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self.assertGreater(len(zfp.infolist()), 0)
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zinfo = zfp.getinfo("file.txt")
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(offset, size) = ota_utils.GetZipEntryOffset(zfp, zinfo)
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self.assertEqual(size, zinfo.file_size)
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self.assertEqual(offset, zipfile.sizeFileHeader+len(zinfo.filename) + 28)
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