Add a Bintool for this, which is used to compress and decompress data. It supports the features needed by binman as well as installing via the lz4 package.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
tools/binman/btool/lz4.py | 140 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 tools/binman/btool/lz4.py
diff --git a/tools/binman/btool/lz4.py b/tools/binman/btool/lz4.py new file mode 100644 index 00000000000..d165f52da92 --- /dev/null +++ b/tools/binman/btool/lz4.py @@ -0,0 +1,140 @@ +# 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') + + 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.GetOutputDir()) as tmp: + tools.WriteFile(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.GetOutputDir()) as inf: + tools.WriteFile(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') + + def version(self): + """Version handler + + Returns: + str: Version number of lz4 + """ + out = self.run_cmd('-V').strip() + if not out: + return super().version() + m_version = re.match(r'.* (v[0-9.]*),.*', out) + return m_version.group(1) if m_version else out