Enable bshuf filter

[t20100]

Hi,

Thanks a lot for this package! 🎉 We love it for the h5web viewer!

I'm wondering what is the issue with the bshuf filter that is commented?

I'm not familiar with webassembly, but by maintaining hdf5plugin, I'm getting used to compile those filter, so if there is anything that could help, let me know.

[bmaranville]

It compiles ok - but then I get a runtime error when I try to use it:

f.get('data').value
Uncaught RuntimeError: null function or function signature mismatch
at bshuf_blocked_wrap_fun (wasm://wasm/00031cc6:wasm-function[64]:0x2c4d)
at bshuf_decompress_lz4 (wasm://wasm/00031cc6:wasm-function[24]:0x1c91)
at H5Z_bshuf_filter (wasm://wasm/00031cc6:wasm-function[17]:0x1969)
at wasm://wasm/00a67752:wasm-function[3055]:0x2023e6
at wasm://wasm/00a67752:wasm-function[672]:0x57570
at wasm://wasm/00a67752:wasm-function[671]:0x56b22
at wasm://wasm/00a67752:wasm-function[745]:0x6519c
at wasm://wasm/00a67752:wasm-function[2921]:0x1e97fc
at wasm://wasm/00a67752:wasm-function[118]:0x15279

I spent some time looking around in the source to see if I could figure out what might be causing the issue, but I haven't found it yet.

[bmaranville]

Ok, I managed to track it down - I need to pass the "-sWASM_BIGINT" flag to the plugin build process, just like I do for h5wasm. Internally emscripten was creating a "legalized" version of the unpack function with 32-bit output, which doesn't match the expected signature

After the change, the bshuf filter seems to build and function fine.

[t20100]

Great! Thanks for the fix!