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https://github.com/AsahiLinux/u-boot
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4583c00236
The patman directory has a number of modules which are used by other tools in U-Boot. This makes it hard to package the tools using pypi since the common files must be copied along with the tool that uses them. To address this, move these files into a new u_boot_pylib library. This can be packaged separately and listed as a dependency of each tool. Signed-off-by: Simon Glass <sjg@chromium.org>
128 lines
4.2 KiB
Python
128 lines
4.2 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright 2022 Google LLC
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#
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"""Bintool implementation for lz4
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lz4 allows compression and decompression of files.
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Documentation is available via::
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man lz4
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Here is the help:
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*** LZ4 command line interface 64-bits v1.9.3, by Yann Collet ***
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Usage :
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lz4 [arg] [input] [output]
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input : a filename
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with no FILE, or when FILE is - or stdin, read standard input
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Arguments :
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-1 : Fast compression (default)
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-9 : High compression
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-d : decompression (default for .lz4 extension)
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-z : force compression
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-D FILE: use FILE as dictionary
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-f : overwrite output without prompting
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-k : preserve source files(s) (default)
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--rm : remove source file(s) after successful de/compression
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-h/-H : display help/long help and exit
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Advanced arguments :
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-V : display Version number and exit
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-v : verbose mode
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-q : suppress warnings; specify twice to suppress errors too
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-c : force write to standard output, even if it is the console
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-t : test compressed file integrity
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-m : multiple input files (implies automatic output filenames)
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-r : operate recursively on directories (sets also -m)
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-l : compress using Legacy format (Linux kernel compression)
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-B# : cut file into blocks of size # bytes [32+]
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or predefined block size [4-7] (default: 7)
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-BI : Block Independence (default)
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-BD : Block dependency (improves compression ratio)
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-BX : enable block checksum (default:disabled)
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--no-frame-crc : disable stream checksum (default:enabled)
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--content-size : compressed frame includes original size (default:not present)
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--list FILE : lists information about .lz4 files (useful for files compressed
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with --content-size flag)
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--[no-]sparse : sparse mode (default:enabled on file, disabled on stdout)
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--favor-decSpeed: compressed files decompress faster, but are less compressed
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--fast[=#]: switch to ultra fast compression level (default: 1)
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--best : same as -12
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Benchmark arguments :
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-b# : benchmark file(s), using # compression level (default : 1)
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-e# : test all compression levels from -bX to # (default : 1)
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-i# : minimum evaluation time in seconds (default : 3s)
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"""
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import re
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import tempfile
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from binman import bintool
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from u_boot_pylib import tools
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# pylint: disable=C0103
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class Bintoollz4(bintool.Bintool):
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"""Compression/decompression using the LZ4 algorithm
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This bintool supports running `lz4` to compress and decompress data, as
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used by binman.
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It is also possible to fetch the tool, which uses `apt` to install it.
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Documentation is available via::
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man lz4
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"""
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def __init__(self, name):
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super().__init__(name, 'lz4 compression', r'.* (v[0-9.]*),.*')
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def compress(self, indata):
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"""Compress data with lz4
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Args:
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indata (bytes): Data to compress
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Returns:
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bytes: Compressed data
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"""
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with tempfile.NamedTemporaryFile(prefix='comp.tmp',
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dir=tools.get_output_dir()) as tmp:
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tools.write_file(tmp.name, indata)
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args = ['--no-frame-crc', '-B4', '-5', '-c', tmp.name]
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return self.run_cmd(*args, binary=True)
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def decompress(self, indata):
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"""Decompress data with lz4
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Args:
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indata (bytes): Data to decompress
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Returns:
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bytes: Decompressed data
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"""
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with tempfile.NamedTemporaryFile(prefix='decomp.tmp',
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dir=tools.get_output_dir()) as inf:
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tools.write_file(inf.name, indata)
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args = ['-cd', inf.name]
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return self.run_cmd(*args, binary=True)
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def fetch(self, method):
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"""Fetch handler for lz4
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This installs the lz4 package using the apt utility.
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Args:
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method (FETCH_...): Method to use
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Returns:
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True if the file was fetched and now installed, None if a method
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other than FETCH_BIN was requested
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Raises:
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Valuerror: Fetching could not be completed
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"""
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if method != bintool.FETCH_BIN:
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return None
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return self.apt_install('lz4')
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