How can I do with error that - Input file has corrupt header: pngload: reached chunk/cache limits

[lix059]

What are you trying to achieve?
I was going to get a thumbnail from a png which is 254 M large, which occured that error.

Have you searched for similar questions?
yes, but I can not find out how to fixed it.

Are you able to provide a minimal, standalone code sample that demonstrates this question?
that is my process code

Are you able to provide a sample image that helps explain the question?
that is error tip

[lovell]

I suspect this image trips the SPNG_CHUNK_COUNT_LIMIT of 1000, which is a safety feature of libspng.

https://github.com/randy408/libspng/blob/master/docs/decode.md#memory-usage

To allow an optional increase in this value, we'd need to expose control over this in libvips first.

Are you able to provide a sample image that fails in this manner?

[lix059]

The sample image is large. Can you leave an email address? I will post to you.

[randy408]

I suspect this image trips the SPNG_CHUNK_COUNT_LIMIT of 1000, which is a safety feature of libspng.

Hopefully it's not that, I'll raise the default value if that's the case. Either way I'll be adding a new error code to differentiate from the other two limits.

[lovell]

@lix059 Thank you, if it's a really big file it might be worth using a file hosting service rather than email e.g. something like Dropbox or Google Drive.

sharp/package.json

Line 5 in 1ff84b2

"author": "Lovell Fuller <npm@lovell.info>",

[lix059]

@lovell I posted the sample image download url to npm@lovell.info email. Thank you.

[lovell]

Thanks for the image, it has 143 chunks, two of which are text chunks that consume ~260MB when decompressed.

$ pngchunks preview221.png | grep "Chunk:" | wc -l
143
$ pngchunks preview221.png | grep zTXt
Chunk: Data Length 131093001 (max 2147483647), Type 1951945850 [zTXt]
Chunk: Data Length 131085202 (max 2147483647), Type 1951945850 [zTXt]

As Randy has pointed out, there's a new unlimited flag in libvips that we need to expose in sharp, which should then allow this image to be processed (this will be opt-in, as the safety features are there for a reason.)

[lix059]

@lovell Thanks.

[lovell]

v0.30.0 now available with this feature.