Switch HDoff_t to uint64_t in the public API

[derobins]

Moves HDoff_t out of the public API and replaces the HDoff_t
parameter type in H5Pset/get_external() with a uint64_t.

Also removes OFF_T from the Fortran public API.

[epourmal]

I am puzzled with this the switch from off_t to haddr_t. The parameter is used for the offsets in external files that ARE not HDF5 files. haddr_t corresponds to an offset in a logical HDF5 file. Are you sure, this is a correct approach?

[derobins]

I am puzzled with this the switch from off_t to haddr_t. The parameter is used for the offsets in external files that ARE not HDF5 files. haddr_t corresponds to an offset in a logical HDF5 file. Are you sure, this is a correct approach?

off_t isn't portable, so it really should be replaced with something that is (HDoff_t is what we use internally). I originally had it as HDoff_t, which I moved to the public API, then wanted to switch the name to something more in line with the other HDF5 primitive types (hoff_t, like hsize_t) and got pushback from Quincey about the semantics of HD* vs h*. We compromised on haddr_t, which is logically reasonable, a 64-bit type, and portable.

We're not using the offset parameter to seek to negative offsets, so the semantics of off_t aren't really necessary and haddr_t makes more semantic sense than an arbitrary integer.

I see your point, though. A haddr_t isn't really a physical offset if there's a user block, so the semantics are a bit different. I just really want to get rid of off_t. Non-standard-C types are annoying to support.

[epourmal]

I just really want to get rid of off_t. Non-standard-C types are annoying to support.

I don't think we can have a good solution here.

[epourmal]

Let's use uint64_t

[fortnern]

We'll need to make sure not to merge this to 1.14

[derobins]

We'll need to make sure not to merge this to 1.14

That won't be a problem. We don't maintain the 1.14 branch anymore and a 1.14.6 release (if that happens) will basically be a patch release with a few bugfixes cherry-picked into a copy of the 1.14.5 release branch.

[brtnfld]

Add to the Release.txt the Fortran changes.

[brtnfld]

Add to the Fortran Section:

The offset parameter was changed for H5P(set|get)_external_f() from an INTEGER of KIND OFF_T to HADDR_T, and the OFF_T parameter is no longer a defined INTEGER KIND.

[Copilot]

Pull Request Overview

This PR removes the deprecated HDoff_t from the public API and standardizes external‐file offsets on haddr_t (a 64-bit type), moving the old typedef into the private header. It also updates all core C functions, the stdio driver, Java JNI, Fortran bindings, C++ interfaces, examples, and documentation to use the new type.

• Relocated HDoff_t to src/H5private.h and removed it from H5public.h.
• Changed all H5Pset/get_external and related internal APIs to use haddr_t.
• Updated language bindings (Java, Fortran, C++) and examples, plus revised release notes.

Reviewed Changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/H5public.h	Removed HDoff_t from the public header
src/H5private.h	Added private typedef of HDoff_t
src/H5Ppublic.h	Changed external‐file offset parameters to haddr_t
src/H5Pdcpl.c	Updated internal property list code to use haddr_t
src/H5Oprivate.h	Switched internal EFL entry offset field to haddr_t
src/H5Oefl.c	Adjusted decode logic to assign haddr_t offsets
src/H5FDstdio.c	Refactored stdio driver to use my_off_t and haddr_t
src/H5Defl.c	Updated external read/write seeks for new offset type
release_docs/RELEASE.txt	Revised notes on external offset type change
java/src/jni/h5pDCPLImp.c	Modified JNI calls to use haddr_t
fortran/test/tH5P_F03.F90	Updated tests to pass haddr_t offsets
fortran/test/tH5P.F90	Switched test variables from OFF_T to HADDR_T
fortran/src/H5match_types.c	Removed matching of off_t in Fortran type mapping
fortran/src/H5f90proto.h	Changed Fortran prototypes to use haddr_t_f
fortran/src/H5Pff.F90	Updated Fortran binding routines to HADDR_T
fortran/src/H5Pf.c	Adjusted C wrappers to use haddr_t_f
c++/src/H5DcreatProp.h	Replaced HDoff_t with haddr_t in C++ API signatures
c++/src/H5DcreatProp.cpp	Updated C++ implementation to pass haddr_t
c++/src/C2Cppfunction_map.htm	Corrected generated map entries to haddr_t
HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90	Example code switched to HADDR_T

Comments suppressed due to low confidence (2)

src/H5private.h:606

• [nitpick] The comment refers to HDoff_t being typedef'd "above," but the public definition was removed; consider clarifying that HDoff_t is now defined in H5private.h to avoid confusion.

* off_t. Both of these are typedef'd to HDoff_t (above).

release_docs/RELEASE.txt:363

• [nitpick] The release notes describe the change to haddr_t for external offsets but omit mention of removing OFF_T from the Fortran public API; consider adding a bullet about replacing OFF_T with HADDR_T in Fortran bindings.

-    - H5P(set|get)_external() now take a haddr_t offset parameter, which is