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![Simon Glass](/assets/img/avatar_default.png)
At present we simply extract the data directly from entries using the image_pos information. This happens to work on current entry types, but cannot work if the entry type encodes the data in some way. Update the ReadData() method to provide the data by calling a new ReadChildData() method in the parent. This allows the entry_Section class, or possibly any other container class, to return the correct data in all cases. Signed-off-by: Simon Glass <sjg@chromium.org>
70 lines
2.4 KiB
Python
70 lines
2.4 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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import tout
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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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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 CompressData(self, indata):
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if self.compress != 'none':
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self.uncomp_size = len(indata)
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data = tools.Compress(indata, self.compress)
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return data
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def ReadBlobContents(self):
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"""Read blob contents into memory
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This function compresses the data before storing if needed.
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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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"""
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indata = tools.ReadFile(self._pathname)
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data = self.CompressData(indata)
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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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