binman: Move compression into binman

The compression functions are not actually used by patman, so we don't
need then in the tools module. Also we want to change them to use
bintools, which patman will not support.

Move these into a new comp_util module, within binman.

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

tools/binman/cbfs_util.py

@@ -20,6 +20,7 @@ import io
 import struct
 import sys
 
+from binman import comp_util
 from binman import elf
 from patman import command
 from patman import tools
@@ -240,9 +241,9 @@ class CbfsFile(object):
         """Handle decompressing data if necessary"""
         indata = self.data
         if self.compress == COMPRESS_LZ4:
-            data = tools.Decompress(indata, 'lz4', with_header=False)
+            data = comp_util.Decompress(indata, 'lz4', with_header=False)
         elif self.compress == COMPRESS_LZMA:
-            data = tools.Decompress(indata, 'lzma', with_header=False)
+            data = comp_util.Decompress(indata, 'lzma', with_header=False)
         else:
             data = indata
         self.memlen = len(data)
@@ -361,9 +362,9 @@ class CbfsFile(object):
         elif self.ftype == TYPE_RAW:
             orig_data = data
             if self.compress == COMPRESS_LZ4:
-                data = tools.Compress(orig_data, 'lz4', with_header=False)
+                data = comp_util.Compress(orig_data, 'lz4', with_header=False)
             elif self.compress == COMPRESS_LZMA:
-                data = tools.Compress(orig_data, 'lzma', with_header=False)
+                data = comp_util.Compress(orig_data, 'lzma', with_header=False)
             self.memlen = len(orig_data)
             self.data_len = len(data)
             attr = struct.pack(ATTR_COMPRESSION_FORMAT,

tools/binman/comp_util.py

@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright 2022 Google LLC
+#
+"""Utilities to compress and decompress data"""
+
+import struct
+import tempfile
+
+from patman import tools
+
+def Compress(indata, algo, with_header=True):
+    """Compress some data using a given algorithm
+
+    Note that for lzma this uses an old version of the algorithm, not that
+    provided by xz.
+
+    This requires 'lz4' and 'lzma_alone' tools. It also requires an output
+    directory to be previously set up, by calling PrepareOutputDir().
+
+    Care is taken to use unique temporary files so that this function can be
+    called from multiple threads.
+
+    Args:
+        indata: Input data to compress
+        algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
+
+    Returns:
+        Compressed data
+    """
+    if algo == 'none':
+        return indata
+    fname = tempfile.NamedTemporaryFile(prefix='%s.comp.tmp' % algo,
+                                        dir=tools.GetOutputDir()).name
+    tools.WriteFile(fname, indata)
+    if algo == 'lz4':
+        data = tools.Run('lz4', '--no-frame-crc', '-B4', '-5', '-c', fname,
+                         binary=True)
+    # cbfstool uses a very old version of lzma
+    elif algo == 'lzma':
+        outfname = tempfile.NamedTemporaryFile(prefix='%s.comp.otmp' % algo,
+                                               dir=tools.GetOutputDir()).name
+        tools.Run('lzma_alone', 'e', fname, outfname, '-lc1', '-lp0', '-pb0',
+                  '-d8')
+        data = tools.ReadFile(outfname)
+    elif algo == 'gzip':
+        data = tools.Run('gzip', '-c', fname, binary=True)
+    else:
+        raise ValueError("Unknown algorithm '%s'" % algo)
+    if with_header:
+        hdr = struct.pack('<I', len(data))
+        data = hdr + data
+    return data
+
+def Decompress(indata, algo, with_header=True):
+    """Decompress some data using a given algorithm
+
+    Note that for lzma this uses an old version of the algorithm, not that
+    provided by xz.
+
+    This requires 'lz4' and 'lzma_alone' tools. It also requires an output
+    directory to be previously set up, by calling PrepareOutputDir().
+
+    Args:
+        indata: Input data to decompress
+        algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
+
+    Returns:
+        Compressed data
+    """
+    if algo == 'none':
+        return indata
+    if with_header:
+        data_len = struct.unpack('<I', indata[:4])[0]
+        indata = indata[4:4 + data_len]
+    fname = tools.GetOutputFilename('%s.decomp.tmp' % algo)
+    with open(fname, 'wb') as fd:
+        fd.write(indata)
+    if algo == 'lz4':
+        data = tools.Run('lz4', '-dc', fname, binary=True)
+    elif algo == 'lzma':
+        outfname = tools.GetOutputFilename('%s.decomp.otmp' % algo)
+        tools.Run('lzma_alone', 'd', fname, outfname)
+        data = tools.ReadFile(outfname, binary=True)
+    elif algo == 'gzip':
+        data = tools.Run('gzip', '-cd', fname, binary=True)
+    else:
+        raise ValueError("Unknown algorithm '%s'" % algo)
+    return data

tools/binman/entry.py

@@ -11,6 +11,7 @@ import pathlib
 import sys
 
 from binman import bintool
+from binman import comp_util
 from dtoc import fdt_util
 from patman import tools
 from patman.tools import ToHex, ToHexSize
@@ -1034,7 +1035,7 @@ features to produce new behaviours.
         self.uncomp_data = indata
         if self.compress != 'none':
             self.uncomp_size = len(indata)
-        data = tools.Compress(indata, self.compress)
+        data = comp_util.Compress(indata, self.compress)
         return data
 
     @classmethod

tools/binman/etype/section.py

@@ -13,6 +13,7 @@ import concurrent.futures
 import re
 import sys
 
+from binman import comp_util
 from binman.entry import Entry
 from binman import state
 from dtoc import fdt_util
@@ -775,7 +776,7 @@ class Entry_section(Entry):
         data = parent_data[offset:offset + child.size]
         if decomp:
             indata = data
-            data = tools.Decompress(indata, child.compress)
+            data = comp_util.Decompress(indata, child.compress)
             if child.uncomp_size:
                 tout.Info("%s: Decompressing data size %#x with algo '%s' to data size %#x" %
                             (child.GetPath(), len(indata), child.compress,

tools/binman/ftest.py

@@ -23,6 +23,7 @@ import urllib.error
 from binman import bintool
 from binman import cbfs_util
 from binman import cmdline
+from binman import comp_util
 from binman import control
 from binman import elf
 from binman import elf_test
@@ -1926,7 +1927,7 @@ class TestFunctional(unittest.TestCase):
             self._ResetDtbs()
 
     def _decompress(self, data):
-        return tools.Decompress(data, 'lz4')
+        return comp_util.Decompress(data, 'lz4')
 
     def testCompress(self):
         """Test compression of blobs"""
@@ -2805,7 +2806,7 @@ class TestFunctional(unittest.TestCase):
     def testExtractCbfsRaw(self):
         """Test extracting CBFS compressed data without decompressing it"""
         data = self._RunExtractCmd('section/cbfs/u-boot-dtb', decomp=False)
-        dtb = tools.Decompress(data, 'lzma', with_header=False)
+        dtb = comp_util.Decompress(data, 'lzma', with_header=False)
         self.assertEqual(EXTRACT_DTB_SIZE, len(dtb))
 
     def testExtractBadEntry(self):
@@ -4232,13 +4233,13 @@ class TestFunctional(unittest.TestCase):
 
         # Check compressed data
         section1 = self._decompress(rest)
-        expect1 = tools.Compress(COMPRESS_DATA + U_BOOT_DATA, 'lz4')
+        expect1 = comp_util.Compress(COMPRESS_DATA + U_BOOT_DATA, 'lz4')
         self.assertEquals(expect1, rest[:len(expect1)])
         self.assertEquals(COMPRESS_DATA + U_BOOT_DATA, section1)
         rest1 = rest[len(expect1):]
 
         section2 = self._decompress(rest1)
-        expect2 = tools.Compress(COMPRESS_DATA + COMPRESS_DATA, 'lz4')
+        expect2 = comp_util.Compress(COMPRESS_DATA + COMPRESS_DATA, 'lz4')
         self.assertEquals(expect2, rest1[:len(expect2)])
         self.assertEquals(COMPRESS_DATA + COMPRESS_DATA, section2)
         rest2 = rest1[len(expect2):]

tools/patman/tools.py

@@ -7,7 +7,6 @@ import glob
 import os
 import shlex
 import shutil
-import struct
 import sys
 import tempfile
 import urllib.request
@@ -518,84 +517,6 @@ def ToString(bval):
     """
     return bval.decode('utf-8')
 
-def Compress(indata, algo, with_header=True):
-    """Compress some data using a given algorithm
-
-    Note that for lzma this uses an old version of the algorithm, not that
-    provided by xz.
-
-    This requires 'lz4' and 'lzma_alone' tools. It also requires an output
-    directory to be previously set up, by calling PrepareOutputDir().
-
-    Care is taken to use unique temporary files so that this function can be
-    called from multiple threads.
-
-    Args:
-        indata: Input data to compress
-        algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
-
-    Returns:
-        Compressed data
-    """
-    if algo == 'none':
-        return indata
-    fname = tempfile.NamedTemporaryFile(prefix='%s.comp.tmp' % algo,
-                                        dir=outdir).name
-    WriteFile(fname, indata)
-    if algo == 'lz4':
-        data = Run('lz4', '--no-frame-crc', '-B4', '-5', '-c', fname,
-                   binary=True)
-    # cbfstool uses a very old version of lzma
-    elif algo == 'lzma':
-        outfname = tempfile.NamedTemporaryFile(prefix='%s.comp.otmp' % algo,
-                                               dir=outdir).name
-        Run('lzma_alone', 'e', fname, outfname, '-lc1', '-lp0', '-pb0', '-d8')
-        data = ReadFile(outfname)
-    elif algo == 'gzip':
-        data = Run('gzip', '-c', fname, binary=True)
-    else:
-        raise ValueError("Unknown algorithm '%s'" % algo)
-    if with_header:
-        hdr = struct.pack('<I', len(data))
-        data = hdr + data
-    return data
-
-def Decompress(indata, algo, with_header=True):
-    """Decompress some data using a given algorithm
-
-    Note that for lzma this uses an old version of the algorithm, not that
-    provided by xz.
-
-    This requires 'lz4' and 'lzma_alone' tools. It also requires an output
-    directory to be previously set up, by calling PrepareOutputDir().
-
-    Args:
-        indata: Input data to decompress
-        algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
-
-    Returns:
-        Compressed data
-    """
-    if algo == 'none':
-        return indata
-    if with_header:
-        data_len = struct.unpack('<I', indata[:4])[0]
-        indata = indata[4:4 + data_len]
-    fname = GetOutputFilename('%s.decomp.tmp' % algo)
-    with open(fname, 'wb') as fd:
-        fd.write(indata)
-    if algo == 'lz4':
-        data = Run('lz4', '-dc', fname, binary=True)
-    elif algo == 'lzma':
-        outfname = GetOutputFilename('%s.decomp.otmp' % algo)
-        Run('lzma_alone', 'd', fname, outfname)
-        data = ReadFile(outfname, binary=True)
-    elif algo == 'gzip':
-        data = Run('gzip', '-cd', fname, binary=True)
-    else:
-        raise ValueError("Unknown algorithm '%s'" % algo)
-    return data
-
 def ToHex(val):
     """Convert an integer value (or None) to a string