binman: Allow extracting a file in an alternative format
In some cases entries encapsulate other data and it is useful to access
the data within. An example is the fdtmap which consists of a 16-byte
header, followed by a devicetree.
Provide an option to specify an alternative format when extracting files.
In the case of fdtmap, this is 'fdt', which produces an FDT file which can
be viewed with fdtdump.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index e7a8365..61642bf 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -815,7 +815,7 @@
self.AddEntryInfo(entries, indent, self.name, self.etype, self.size,
self.image_pos, self.uncomp_size, self.offset, self)
- def ReadData(self, decomp=True):
+ def ReadData(self, decomp=True, alt_format=None):
"""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
@@ -832,19 +832,20 @@
# although compressed sections are currently not supported
tout.Debug("ReadChildData section '%s', entry '%s'" %
(self.section.GetPath(), self.GetPath()))
- data = self.section.ReadChildData(self, decomp)
+ data = self.section.ReadChildData(self, decomp, alt_format)
return data
- def ReadChildData(self, child, decomp=True):
+ def ReadChildData(self, child, decomp=True, alt_format=None):
"""Read the data for a particular child entry
This reads data from the parent and extracts the piece that relates to
the given child.
Args:
- child: Child entry to read data for (must be valid)
- decomp: True to decompress any compressed data before returning it;
- False to return the raw, uncompressed data
+ child (Entry): Child entry to read data for (must be valid)
+ decomp (bool): True to decompress any compressed data before
+ returning it; False to return the raw, uncompressed data
+ alt_format (str): Alternative format to read in, or None
Returns:
Data for the child (bytes)
@@ -857,6 +858,20 @@
self.ProcessContentsUpdate(data)
self.Detail('Loaded data size %x' % len(data))
+ def GetAltFormat(self, data, alt_format):
+ """Read the data for an extry in an alternative format
+
+ Supported formats are list in the documentation for each entry. An
+ example is fdtmap which provides .
+
+ Args:
+ data (bytes): Data to convert (this should have been produced by the
+ entry)
+ alt_format (str): Format to use
+
+ """
+ pass
+
def GetImage(self):
"""Get the image containing this entry
@@ -997,3 +1012,13 @@
tout.Info("Node '%s': etype '%s': %s selected" %
(node.path, etype, new_etype))
return True
+
+ def CheckAltFormats(self, alt_formats):
+ """Add any alternative formats supported by this entry type
+
+ Args:
+ alt_formats (dict): Dict to add alt_formats to:
+ key: Name of alt format
+ value: Help text
+ """
+ pass