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https://github.com/brain-hackers/u-boot-brain
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26cc8fccc6
This comma is not needed. Drop it. Signed-off-by: Simon Glass <sjg@chromium.org>
79 lines
2.9 KiB
Python
79 lines
2.9 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2016 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Entry-type module for blobs, which are binary objects read from files
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#
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from entry import Entry
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import fdt_util
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import state
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import tools
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class Entry_blob(Entry):
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"""Entry containing an arbitrary binary blob
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Note: This should not be used by itself. It is normally used as a parent
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class by other entry types.
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Properties / Entry arguments:
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- filename: Filename of file to read into entry
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- compress: Compression algorithm to use:
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none: No compression
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lz4: Use lz4 compression (via 'lz4' command-line utility)
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This entry reads data from a file and places it in the entry. The
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default filename is often specified specified by the subclass. See for
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example the 'u_boot' entry which provides the filename 'u-boot.bin'.
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If compression is enabled, an extra 'uncomp-size' property is written to
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the node (if enabled with -u) which provides the uncompressed size of the
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data.
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"""
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def __init__(self, section, etype, node):
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Entry.__init__(self, section, etype, node)
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self._filename = fdt_util.GetString(self._node, 'filename', self.etype)
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self._compress = fdt_util.GetString(self._node, 'compress', 'none')
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self._uncompressed_size = None
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def ObtainContents(self):
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self._filename = self.GetDefaultFilename()
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self._pathname = tools.GetInputFilename(self._filename)
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self.ReadBlobContents()
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return True
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def ReadBlobContents(self):
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# We assume the data is small enough to fit into memory. If this
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# is used for large filesystem image that might not be true.
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# In that case, Image.BuildImage() could be adjusted to use a
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# new Entry method which can read in chunks. Then we could copy
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# the data in chunks and avoid reading it all at once. For now
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# this seems like an unnecessary complication.
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data = tools.ReadFile(self._pathname)
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if self._compress == 'lz4':
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self._uncompressed_size = len(data)
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'''
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import lz4 # Import this only if needed (python-lz4 dependency)
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try:
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data = lz4.frame.compress(data)
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except AttributeError:
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data = lz4.compress(data)
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'''
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data = tools.Run('lz4', '-c', self._pathname)
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self.SetContents(data)
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return True
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def GetDefaultFilename(self):
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return self._filename
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def AddMissingProperties(self):
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Entry.AddMissingProperties(self)
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if self._compress != 'none':
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state.AddZeroProp(self._node, 'uncomp-size')
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def SetCalculatedProperties(self):
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Entry.SetCalculatedProperties(self)
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if self._uncompressed_size is not None:
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state.SetInt(self._node, 'uncomp-size', self._uncompressed_size)
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