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Add font file check #19

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Merged
merged 1 commit into from
Aug 13, 2019
Merged

Add font file check #19

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4 changes: 4 additions & 0 deletions adafruit_framebuf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_framebuf.git"

import os
import struct

# Framebuf format constants:
Expand Down Expand Up @@ -364,6 +365,9 @@ def __init__(self, font_name='font5x8.bin'):
print("Could not find font file", font_name)
raise
self.font_width, self.font_height = struct.unpack('BB', self._font.read(2))
# simple font file validation check based on expected file size
if 2 + 256 * self.font_width != os.stat(font_name)[6]:
raise RuntimeError("Invalid font file: " + font_name)

def deinit(self):
"""Close the font file as cleanup."""
Expand Down