fixed LZ4 plugin

[captainkirk99]

Fixes for the LZ4 plugin. Fixes #200

---

Important

Fix and optimize LZ4 plugin by removing static keyword, initializing blockSize, using LZ4_compress_fast, and commenting out debug prints in H5Z_filter_lz4.

• Function Changes:
  • Remove static keyword from H5Z_filter_lz4 declaration and definition in H5Zlz4.c.
  • Initialize blockSize to DEFAULT_BLOCK_SIZE in forward filter path.
  • Use LZ4_compress_fast instead of LZ4_compress_default in H5Z_filter_lz4.
• Misc:
  • Comment out debug printf statements in H5Z_filter_lz4 for decompression size mismatch and block size information.

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[captainkirk99]

I would like to get a CI running before submitting this PR (see #201).

[captainkirk99]

OK, approve my workflow runs and we'll see how the CI likes these changes...

[bmaranville]

I can verify that after this change, the lz4 plugin seems to write valid data, but is broken before this.

[ajelenak]

@bmaranville Can you explain more in what way was this plugin broken before? And when was before? Until the changes in this PR?

[bmaranville]

Sorry - I was mistaken. The fix seems to be somewhere between version hdf5-1.14.6 and the current master. If I build the lz4 plugin with hdf5-1.14.6 I get this error when decompressing:

testing: lz4
decompressed size not the same: -16131, != 16135

[ajelenak]

Thanks for checking.

[ajelenak]

I am closing this pull request because the LZ4 filter plugin's input argument (cd_values[]) was changed. All else from this PR are now in #210.