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4f463e3dee
Remove the obsolete compressed data header handling from the utilities to compress and decompress data. The header is uncommon, not supported by U-Boot and incompatible with external compressed artifacts. Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com> Reviewed-by: Simon Glass <sjg@chromium.org>
69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright 2022 Google LLC
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#
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"""Utilities to compress and decompress data"""
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import tempfile
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from binman import bintool
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from patman import tools
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LZ4 = bintool.Bintool.create('lz4')
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HAVE_LZ4 = LZ4.is_present()
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LZMA_ALONE = bintool.Bintool.create('lzma_alone')
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HAVE_LZMA_ALONE = LZMA_ALONE.is_present()
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def compress(indata, algo):
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"""Compress some data using a given algorithm
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Note that for lzma this uses an old version of the algorithm, not that
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provided by xz.
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This requires 'lz4' and 'lzma_alone' tools. It also requires an output
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directory to be previously set up, by calling PrepareOutputDir().
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Args:
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indata (bytes): Input data to compress
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algo (str): Algorithm to use ('none', 'lz4' or 'lzma')
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Returns:
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bytes: Compressed data
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"""
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if algo == 'none':
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return indata
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if algo == 'lz4':
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data = LZ4.compress(indata)
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# cbfstool uses a very old version of lzma
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elif algo == 'lzma':
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data = LZMA_ALONE.compress(indata)
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else:
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raise ValueError("Unknown algorithm '%s'" % algo)
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return data
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def decompress(indata, algo):
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"""Decompress some data using a given algorithm
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Note that for lzma this uses an old version of the algorithm, not that
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provided by xz.
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This requires 'lz4' and 'lzma_alone' tools. It also requires an output
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directory to be previously set up, by calling PrepareOutputDir().
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Args:
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indata (bytes): Input data to decompress
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algo (str): Algorithm to use ('none', 'lz4' or 'lzma')
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Returns:
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(bytes) Compressed data
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"""
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if algo == 'none':
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return indata
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if algo == 'lz4':
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data = LZ4.decompress(indata)
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elif algo == 'lzma':
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data = LZMA_ALONE.decompress(indata)
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else:
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raise ValueError("Unknown algorithm '%s'" % algo)
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return data
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