fc7e0e06b6
Add construct_sparse_image() to test_utils.py, which is a util function to create sparse images. The new tests also partially cover the recent changes that add 'incomplete' and 'uses_shard_blocks' tags. Test: python -m unittest test_common Change-Id: Ia15f5c4ad12423691216ebbad2c28f95c8427d7e
96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
#
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# Copyright (C) 2018 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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#
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"""
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Utils for running unittests.
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"""
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import os
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import os.path
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import struct
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import common
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def get_testdata_dir():
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"""Returns the testdata dir, in relative to the script dir."""
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# The script dir is the one we want, which could be different from pwd.
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current_dir = os.path.dirname(os.path.realpath(__file__))
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return os.path.join(current_dir, 'testdata')
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def construct_sparse_image(chunks):
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"""Returns a sparse image file constructed from the given chunks.
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From system/core/libsparse/sparse_format.h.
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typedef struct sparse_header {
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__le32 magic; // 0xed26ff3a
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__le16 major_version; // (0x1) - reject images with higher major versions
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__le16 minor_version; // (0x0) - allow images with higer minor versions
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__le16 file_hdr_sz; // 28 bytes for first revision of the file format
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__le16 chunk_hdr_sz; // 12 bytes for first revision of the file format
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__le32 blk_sz; // block size in bytes, must be a multiple of 4 (4096)
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__le32 total_blks; // total blocks in the non-sparse output image
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__le32 total_chunks; // total chunks in the sparse input image
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__le32 image_checksum; // CRC32 checksum of the original data, counting
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// "don't care" as 0. Standard 802.3 polynomial,
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// use a Public Domain table implementation
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} sparse_header_t;
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typedef struct chunk_header {
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__le16 chunk_type; // 0xCAC1 -> raw; 0xCAC2 -> fill;
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// 0xCAC3 -> don't care
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__le16 reserved1;
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__le32 chunk_sz; // in blocks in output image
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__le32 total_sz; // in bytes of chunk input file including chunk header
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// and data
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} chunk_header_t;
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Args:
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chunks: A list of chunks to be written. Each entry should be a tuple of
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(chunk_type, block_number).
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Returns:
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Filename of the created sparse image.
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"""
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SPARSE_HEADER_MAGIC = 0xED26FF3A
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SPARSE_HEADER_FORMAT = "<I4H4I"
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CHUNK_HEADER_FORMAT = "<2H2I"
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sparse_image = common.MakeTempFile(prefix='sparse-', suffix='.img')
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with open(sparse_image, 'wb') as fp:
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fp.write(struct.pack(
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SPARSE_HEADER_FORMAT, SPARSE_HEADER_MAGIC, 1, 0, 28, 12, 4096,
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sum(chunk[1] for chunk in chunks),
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len(chunks), 0))
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for chunk in chunks:
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data_size = 0
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if chunk[0] == 0xCAC1:
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data_size = 4096 * chunk[1]
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elif chunk[0] == 0xCAC2:
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data_size = 4
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elif chunk[0] == 0xCAC3:
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pass
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else:
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assert False, "Unsupported chunk type: {}".format(chunk[0])
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fp.write(struct.pack(
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CHUNK_HEADER_FORMAT, chunk[0], 0, chunk[1], data_size + 12))
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if data_size != 0:
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fp.write(os.urandom(data_size))
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return sparse_image
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