Handle PNG cause exception: OSError: Truncated File Read

[dxsooo]

What did you do?

Open an image and get its width

What did you expect to happen?

width printed

What actually happened?

come into exception:
OSError: Truncated File Read
in convert

What are your OS, Python and Pillow versions?

• OS: archlinux(5.16.12-arch1-1)
• Python: 3.10
• Pillow: 9.0.1

from PIL import Image
fn = '142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193'
with Image.open(fn) as fo:
    img = fo.convert('RGB')
    print(img.width)

the image:
142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193.zip

it can be viewed in Browser and image viewer but failed in pillow.

[radarhere]

If I run pngcheck over your image, I get

$ pngcheck 142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193    
142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193  EOF while reading IDAT data
ERROR: 142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193

So i would conclude that your image is broken.

But if all you want is the width, the following code will do that without a problem.

from PIL import Image
fn = '142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193'
with Image.open(fn) as fo:
    print(fo.width)

[dxsooo]

yes, but get width is just a simple usage, there are many other operations(e.g.: fo.show()、fo.convert('RGB'))

Is there some flag or processing that make pillow can handle this broken image in proper way? As the image is valid in browser and image viewers

[radarhere]

For this particular image, you could just load() it and ignore the error.

from PIL import Image
fn = '142fc7b8018343d43101dae4900c99a4c0de558e33f6da2d029320633aa01193'
with Image.open(fn) as fo:
    try:
    	fo.load()
    except OSError:
    	pass
    img = fo.convert('RGB')
    print(img.width)

[dxsooo]

It works, thank radarhere