f17219ad42
Bintool.version already contains everything required to get the version out of lz4 binary so let's not override it with its own implementation. Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Reviewed-by: Simon Glass <sjg@chromium.org>
129 lines
4.2 KiB
Python
129 lines
4.2 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
|
|
# Copyright 2022 Google LLC
|
|
#
|
|
"""Bintool implementation for lz4
|
|
|
|
lz4 allows compression and decompression of files.
|
|
|
|
Documentation is available via::
|
|
|
|
man lz4
|
|
|
|
Here is the help:
|
|
|
|
*** LZ4 command line interface 64-bits v1.9.3, by Yann Collet ***
|
|
Usage :
|
|
lz4 [arg] [input] [output]
|
|
|
|
input : a filename
|
|
with no FILE, or when FILE is - or stdin, read standard input
|
|
Arguments :
|
|
-1 : Fast compression (default)
|
|
-9 : High compression
|
|
-d : decompression (default for .lz4 extension)
|
|
-z : force compression
|
|
-D FILE: use FILE as dictionary
|
|
-f : overwrite output without prompting
|
|
-k : preserve source files(s) (default)
|
|
--rm : remove source file(s) after successful de/compression
|
|
-h/-H : display help/long help and exit
|
|
|
|
Advanced arguments :
|
|
-V : display Version number and exit
|
|
-v : verbose mode
|
|
-q : suppress warnings; specify twice to suppress errors too
|
|
-c : force write to standard output, even if it is the console
|
|
-t : test compressed file integrity
|
|
-m : multiple input files (implies automatic output filenames)
|
|
-r : operate recursively on directories (sets also -m)
|
|
-l : compress using Legacy format (Linux kernel compression)
|
|
-B# : cut file into blocks of size # bytes [32+]
|
|
or predefined block size [4-7] (default: 7)
|
|
-BI : Block Independence (default)
|
|
-BD : Block dependency (improves compression ratio)
|
|
-BX : enable block checksum (default:disabled)
|
|
--no-frame-crc : disable stream checksum (default:enabled)
|
|
--content-size : compressed frame includes original size (default:not present)
|
|
--list FILE : lists information about .lz4 files (useful for files compressed
|
|
with --content-size flag)
|
|
--[no-]sparse : sparse mode (default:enabled on file, disabled on stdout)
|
|
--favor-decSpeed: compressed files decompress faster, but are less compressed
|
|
--fast[=#]: switch to ultra fast compression level (default: 1)
|
|
--best : same as -12
|
|
Benchmark arguments :
|
|
-b# : benchmark file(s), using # compression level (default : 1)
|
|
-e# : test all compression levels from -bX to # (default : 1)
|
|
-i# : minimum evaluation time in seconds (default : 3s)
|
|
"""
|
|
|
|
import re
|
|
import tempfile
|
|
|
|
from binman import bintool
|
|
from patman import tools
|
|
|
|
# pylint: disable=C0103
|
|
class Bintoollz4(bintool.Bintool):
|
|
"""Compression/decompression using the LZ4 algorithm
|
|
|
|
This bintool supports running `lz4` to compress and decompress data, as
|
|
used by binman.
|
|
|
|
It is also possible to fetch the tool, which uses `apt` to install it.
|
|
|
|
Documentation is available via::
|
|
|
|
man lz4
|
|
"""
|
|
def __init__(self, name):
|
|
super().__init__(name, 'lz4 compression', r'.* (v[0-9.]*),.*')
|
|
|
|
def compress(self, indata):
|
|
"""Compress data with lz4
|
|
|
|
Args:
|
|
indata (bytes): Data to compress
|
|
|
|
Returns:
|
|
bytes: Compressed data
|
|
"""
|
|
with tempfile.NamedTemporaryFile(prefix='comp.tmp',
|
|
dir=tools.get_output_dir()) as tmp:
|
|
tools.write_file(tmp.name, indata)
|
|
args = ['--no-frame-crc', '-B4', '-5', '-c', tmp.name]
|
|
return self.run_cmd(*args, binary=True)
|
|
|
|
def decompress(self, indata):
|
|
"""Decompress data with lz4
|
|
|
|
Args:
|
|
indata (bytes): Data to decompress
|
|
|
|
Returns:
|
|
bytes: Decompressed data
|
|
"""
|
|
with tempfile.NamedTemporaryFile(prefix='decomp.tmp',
|
|
dir=tools.get_output_dir()) as inf:
|
|
tools.write_file(inf.name, indata)
|
|
args = ['-cd', inf.name]
|
|
return self.run_cmd(*args, binary=True)
|
|
|
|
def fetch(self, method):
|
|
"""Fetch handler for lz4
|
|
|
|
This installs the lz4 package using the apt utility.
|
|
|
|
Args:
|
|
method (FETCH_...): Method to use
|
|
|
|
Returns:
|
|
True if the file was fetched and now installed, None if a method
|
|
other than FETCH_BIN was requested
|
|
|
|
Raises:
|
|
Valuerror: Fetching could not be completed
|
|
"""
|
|
if method != bintool.FETCH_BIN:
|
|
return None
|
|
return self.apt_install('lz4')
|