Enum LibverBound 

pub enum LibverBound {
    Earliest,
    V18,
    V110,
    V112,
    V114,
    V200,
}

The low half of libhdf5’s H5Pset_libver_bounds — the oldest library release a file must stay readable by.

It is the file-wide switch that picks between on-disk message versions: libhdf5 keeps one table per message type (H5O_dtype_ver_bounds, H5O_layout_ver_bounds, …) mapping the bound to the version it stamps. Raising the bound lets the library use newer, tighter encodings; lowering it keeps older readers able to open the file.

Variants

Earliest

H5F_LIBVER_EARLIEST, the default: every message at its oldest version that can express what the file holds.

V18

H5F_LIBVER_V18.

V110

H5F_LIBVER_V110.

V112

H5F_LIBVER_V112.

V114

H5F_LIBVER_V114.

V200

H5F_LIBVER_V200, which is H5F_LIBVER_LATEST for libhdf5 2.0.

Implementations

impl LibverBound

pub fn dtype_version(self) -> u8

The datatype message version this bound calls for — libhdf5’s H5O_dtype_ver_bounds (H5T.c), the floor H5T_set_version raises a datatype to.

pub fn layout_version(self) -> u8

The data layout message version this bound calls for — libhdf5’s H5O_layout_ver_bounds (H5Dlayout.c:44).

It is what decides the chunk index, before the dataspace gets a say: H5D__chunk_set_info reaches the v1.10 indexes — extensible array, fixed array, v2 B-tree, single chunk, implicit — only once this version is 4 or more (H5Dchunk.c:936). Below that the layout message has no index-type field at all and the chunks are indexed by the version-1 B-tree, which is why V18 and Earliest share one index despite differing in every other message version.

pub fn superblock_version(self) -> u8

The superblock version this bound calls for — libhdf5’s HDF5_superblock_ver_bounds (H5Fsuper.c:68), the floor H5F__super_init raises the content-derived version to.

Version 0 is the H5F_LIBVER_EARLIEST entry (HDF5_SUPERBLOCK_VERSION_DEF); a writer whose own structures need more takes the higher of the two.

pub fn from_superblock_version(version: u8) -> Self

The lowest bound whose superblock_version matches an on-disk version byte.

Lossy in one direction: superblock version 3 is shared by four bounds (V110 through V200), because raising the low bound past V18 never raises the superblock further — the version alone cannot tell them apart, so this reports the lowest, V110. A version this crate’s own writer never emits (1) reads back as Earliest, the same legacy generation as 0; anything past 3 has no bound to report and falls back to the library’s newest.

Trait Implementations

impl Clone for LibverBound

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for LibverBound

impl Debug for LibverBound

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LibverBound

fn default() -> Self

Returns the “default value” for a type.

impl Eq for LibverBound

impl Ord for LibverBound

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for LibverBound

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for LibverBound

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for LibverBound