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fix custom io reader/writer API - #130
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davidkoski
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Sep 10, 2026
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Looks good, see ml-explore/mlx-swift#476
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ml-explore/mlx-c#130 changed `mlx_io_vtable` so that the callbacks report whether they succeeded: int (*seek)(void*, int64_t off, int whence); size_t (*read)(void*, char* data, size_t n); size_t (*read_at_offset)(void*, char* data, size_t n, size_t off); size_t (*write)(void*, const char* data, size_t n); and `CReader`/`CWriter` now turn a negative seek or a short read/write into a thrown `std::runtime_error`. Bump the mlx-c submodule to that commit (plus the checked-in copies of `io_types.h` and the CMake `GIT_TAG`) and adapt the Swift side: - `FileIOState.seek` returns `0`/`-1` instead of silently ignoring a bad `whence` or a negative resulting offset. - `FileIOState.read` returns the number of bytes actually read, so a file that is truncated after its header was parsed now fails instead of leaving the destination buffer uninitialized. The private implementation is renamed `readBytes` so it cannot be confused with the two public overloads. - The in-memory reader reports an out-of-bounds read as `0` bytes rather than doing nothing, and its `seek` reports failure for an unknown `whence` or a negative offset. - The file reader's `write` reports `0` bytes, so using it as a writer errors out instead of silently discarding the data. This is the error-propagation path the load progress work was waiting on (ml-explore/mlx#3742 is already in the vendored mlx v0.32.2), so the truncated file test asserts a failure rather than skipping, and a new test truncates the file *after* the header is parsed to cover the lazy read path: [mlx_io_reader] unable to read 65536 bytes (read 65504 instead) in file ... Also fix the `withLoadProgressHandler` documentation links -- the `-(_,()throws->R)` disambiguation does not resolve and `verify-docs.sh` builds with `--warnings-as-errors` -- document why the reported progress is approximate (loading is lazy, so it may stop short of the file size and it counts bytes read rather than bytes covered), and add `LoadProgress` to the MLX topics.
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