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performance fixes#3290

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edhartnett wants to merge 65 commits intoUnidata:mainfrom
edhartnett:ejh_0222
Draft

performance fixes#3290
edhartnett wants to merge 65 commits intoUnidata:mainfrom
edhartnett:ejh_0222

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@edhartnett edhartnett commented Feb 22, 2026

Fixes #1877 Fixes #1947 Fixes #2721 Fixes #1947 Fixes #1380 Fixes #1381 Fixes #1757 Fixes #1877 Fixes #1947 Fixes #3226 Fixes #1056
Fixes #2664 — SEGV in get_attached_info (hdf5open.c)
Fixes #2665 — Memory leak in NC_hashmapnew / nc4_nc4f_list_add (nc4internal.c)
Fixes #2666 — heap-buffer-overflow in get_attached_info (hdf5open.c)
Fixes #2667 — memcpy-param-overlap in get_attached_info (hdf5open.c)
Fixes #2668 — heap-buffer-overflow in NC4_get_vars (hdf5var.c)
Fixes #851 Fixes #1374 Fixes #2354
Part of #2750
Fixes #3291
Fixes #3292
Fixes #3294

Some performance fixes.

This is a draft until other open PRs get merged.

These changes were generated with AI assistance but with human in the loop (me!) for every decision. I have personally reviewed every line of change in the PR and it is all of benefit to netcdf-c. These changes represent a serious attempt to improve netCDF and are in accordance with project practices and customs.

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