[PATCH v2 32/38] binman: Add a bintool implementation for lzma_alone

[Simon Glass]

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
lzma-alone package.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 tools/binman/btool/lzma_alone.py | 126 +++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 tools/binman/btool/lzma_alone.py

diff --git a/tools/binman/btool/lzma_alone.py b/tools/binman/btool/lzma_alone.py
new file mode 100644
index 00000000000..d7c62dfd2a5
--- /dev/null
+++ b/tools/binman/btool/lzma_alone.py
@@ -0,0 +1,126 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright 2022 Google LLC
+#
+"""Bintool implementation for lzma_alone
+
+lzma_alone allows compression and decompression of files, using an older version
+of lzma.
+
+Documentation is available via::
+
+   man lzma_alone
+
+Here is the help:
+
+LZMA 9.22 beta : Igor Pavlov : Public domain : 2011-04-18
+
+Usage:  LZMA <e|d> inputFile outputFile [<switches>...]
+  e: encode file
+  d: decode file
+  b: Benchmark
+<Switches>
+  -a{N}:  set compression mode - [0, 1], default: 1 (max)
+  -d{N}:  set dictionary size - [12, 30], default: 23 (8MB)
+  -fb{N}: set number of fast bytes - [5, 273], default: 128
+  -mc{N}: set number of cycles for match finder
+  -lc{N}: set number of literal context bits - [0, 8], default: 3
+  -lp{N}: set number of literal pos bits - [0, 4], default: 0
+  -pb{N}: set number of pos bits - [0, 4], default: 2
+  -mf{MF_ID}: set Match Finder: [bt2, bt3, bt4, hc4], default: bt4
+  -mt{N}: set number of CPU threads
+  -eos:   write End Of Stream marker
+  -si:    read data from stdin
+  -so:    write data to stdout
+"""
+
+import re
+import tempfile
+
+from binman import bintool
+from patman import tools
+
+# pylint: disable=C0103
+class Bintoollzma_alone(bintool.Bintool):
+    """Compression/decompression using the LZMA algorithm
+
+    This bintool supports running `lzma_alone` 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 lzma_alone
+    """
+    def __init__(self, name):
+        super().__init__(name, 'lzma_alone compression')
+
+    def compress(self, indata):
+        """Compress data with lzma_alone
+
+        Args:
+            indata (bytes): Data to compress
+
+        Returns:
+            bytes: Compressed data
+        """
+        with tempfile.NamedTemporaryFile(prefix='comp.tmp',
+                                         dir=tools.GetOutputDir()) as inf:
+            tools.WriteFile(inf.name, indata)
+            with tempfile.NamedTemporaryFile(prefix='compo.otmp',
+                                             dir=tools.GetOutputDir()) as outf:
+                args = ['e', inf.name, outf.name, '-lc1', '-lp0', '-pb0', '-d8']
+                self.run_cmd(*args, binary=True)
+                return tools.ReadFile(outf.name)
+
+    def decompress(self, indata):
+        """Decompress data with lzma_alone
+
+        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)
+            with tempfile.NamedTemporaryFile(prefix='compo.otmp',
+                                             dir=tools.GetOutputDir()) as outf:
+                args = ['d', inf.name, outf.name]
+                self.run_cmd(*args, binary=True)
+                return tools.ReadFile(outf.name, binary=True)
+
+    def fetch(self, method):
+        """Fetch handler for lzma_alone
+
+        This installs the lzma-alone 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('lzma-alone')
+
+    def version(self):
+        """Version handler
+
+        Returns:
+            str: Version number of lzma_alone
+        """
+        out = self.run_cmd_result('', raise_on_error=False).stderr.strip()
+        lines = out.splitlines()
+        if not lines:
+            return super().version()
+        out = lines[0]
+        # e.g. LZMA 9.22 beta : Igor Pavlov : Public domain : 2011-04-18
+        m_version = re.match(r'LZMA ([^:]*).*', out)
+        return m_version.group(1).strip() if m_version else out
-- 
2.34.1.575.g55b058a8bb-goog