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binman: Allow reading an entry from an image

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It is useful to be able to extract entry contents from an image to see
what is inside. Add a simple function to read the contents of an entry,
decompressing it by default.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2019-07-08 14:25:50 -06:00
parent eea264ead3
commit f667e45b1c
5 changed files with 99 additions and 1 deletions
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21
tools/binman/entry.py
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@ -659,3 +659,24 @@ features to produce new behaviours.
"""
self.AddEntryInfo(entries, indent, self.name, self.etype, self.size,
self.image_pos, self.uncomp_size, self.offset, self)
def ReadData(self, decomp=True):
"""Read the data for an entry from the image
This is used when the image has been read in and we want to extract the
data for a particular entry from that image.
Args:
decomp: True to decompress any compressed data before returning it;
False to return the raw, uncompressed data
Returns:
Entry data (bytes)
"""
# Use True here so that we get an uncompressed section to work from,
# although compressed sections are currently not supported
data = self.section.ReadData(True)
tout.Info('%s: Reading data from offset %#x-%#x, size %#x (avail %#x)' %
(self.GetPath(), self.offset, self.offset + self.size,
self.size, len(data)))
return data[self.offset:self.offset + self.size]