Files
Scot Breitenfeld 853451a3a7 HL: Fix prefix-match bugs in H5TB field lookup and H5DS/H5IM CLASS checks (#6371)
- H5TB: strcmp replaces strncmp in H5TBfind_field so that field names
  that are a prefix of a requested name (or vice-versa) are no longer
  matched. HLTB_MAX_FIELD_LEN (255) is now public in H5TBpublic.h and
  exposed to Fortran as HLTB_MAX_FIELD_LEN_F in H5TBff.F90.
  H5TBget_field_info documents the buffer-size requirement and truncation
  behaviour. H5TBget_field_info guards against overflow on long names.

- H5IM: H5IMis_image and H5IMis_palette refactored into a shared helper
  (H5IM__class_attr_equals). The helper now reads both fixed-length and
  variable-length CLASS string attributes, using H5Treclaim for VL memory.
  strcmp replaces strncmp for exact-match semantics.

- H5DS: H5DSis_scale and H5DS_is_reserved both support variable-length
  CLASS string attributes via H5Aget_space/H5Aread/H5Treclaim. The
  fixed-length path retains the 16-byte size guard. strcmp is used
  throughout for exact comparison.

- Tests: new test functions test_is_scale_class_prefix,
  test_is_reserved_class_prefix, and test_class_prefix cover fixed-length
  prefix/exact/wrong-value cases and variable-length string cases.
  test_table.c adds write and read field-name prefix rejection cases and
  boundary-length truncation verification. All malloc calls are NULL-checked.

- CHANGELOG updated with a summary of all fixes.
2026-05-22 11:28:24 -05:00
..
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