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font-patcher: Ignore PPEM for non ttf/otf fonts

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[why]
When the source font does not have a HEAD table (i.e. is not a ttf/otf
font but for example a sfd) we can not copy the PPEM and flag values.
The patcher crashes.

[how]
Just put the code into a try block. We could check the signature
instead, but this would add more and complex code.

Reported-by: Jakub Jirutka <jakub@jirutka.cz>
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>
This commit is contained in:
Fini Jastrow 2022-08-19 18:47:50 +02:00 committed by Fini
parent 189bc8673f
commit c5878d44db
1 changed files with 22 additions and 14 deletions
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36
font-patcher
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@ -93,7 +93,8 @@ class TableHEADWriter:
self.tab_offset = self.getlong()
self.tab_length = self.getlong()
if tab_name == b'head':
break
return
raise Exception('No HEAD table found')
def goto(self, where):
""" Go to a named location in the file or to the specified index """
@ -251,19 +252,26 @@ class font_patcher:
message = "\nGenerated: {} in '{}'".format(self.sourceFont.fullname, outfile)
# Adjust flags that can not be changed via fontforge
source_font = TableHEADWriter(self.args.font)
source_font.close()
dest_font = TableHEADWriter(outfile)
if source_font.flags & 0x08 == 0 and dest_font.flags & 0x08 != 0:
print("Changing flags from 0x{:X} to 0x{:X}".format(dest_font.flags, dest_font.flags & ~0x08))
dest_font.putshort(dest_font.flags & ~0x08, 'flags') # clear 'ppem_to_int'
if source_font.lowppem != dest_font.lowppem:
print("Changing lowestRecPPEM from {} to {}".format(dest_font.lowppem, source_font.lowppem))
dest_font.putshort(source_font.lowppem, 'lowestRecPPEM')
if dest_font.modified:
dest_font.reset_table_checksum()
dest_font.reset_full_checksum()
dest_font.close()
try:
source_font = TableHEADWriter(self.args.font)
dest_font = TableHEADWriter(outfile)
if source_font.flags & 0x08 == 0 and dest_font.flags & 0x08 != 0:
print("Changing flags from 0x{:X} to 0x{:X}".format(dest_font.flags, dest_font.flags & ~0x08))
dest_font.putshort(dest_font.flags & ~0x08, 'flags') # clear 'ppem_to_int'
if source_font.lowppem != dest_font.lowppem:
print("Changing lowestRecPPEM from {} to {}".format(dest_font.lowppem, source_font.lowppem))
dest_font.putshort(source_font.lowppem, 'lowestRecPPEM')
if dest_font.modified:
dest_font.reset_table_checksum()
dest_font.reset_full_checksum()
except Exception as error:
print("Can not handle font flags ({})".format(repr(error)))
finally:
try:
source_font.close()
dest_font.close()
except:
pass
print(message)
if self.args.postprocess: