From 992d475003b33f2fd063d437df2a4bebfa905908 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sun, 9 Jan 2022 20:14:05 -0700
Subject: [PATCH] binman: Add a bintool implementation for lz4

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>
---
 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 0000000..d165f52
--- /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
-- 
2.7.4