Enum Variant 

pub enum Variant {
    Classic,
    Big,
}

Which variant of the TIFF container a stream uses, distinguished by the header magic number.

The two variants share an identical tag/IFD model; they differ only in the width of the structural fields — BigTIFF widens every file offset (and the IFD entry count and per-field value count) from 32 to 64 bits so a file may exceed 4 GiB (references/tiff/bigtiff.html). The Variant::Big arm — and every 64-bit width it selects — exists only when the bigtiff feature is enabled.

Variants

Classic

Classic TIFF 6.0: magic 42, an 8-byte header, 12-byte IFD entries, 32-bit offsets.

Big

BigTIFF: magic 43, a 16-byte header, 20-byte IFD entries, 64-bit offsets.

Implementations

impl Variant

pub fn magic(self) -> u16

The header magic number (42 for classic, 43 for BigTIFF).

pub fn header_size(self) -> usize

The size of the image file header in bytes (8 classic, 16 BigTIFF).

pub fn entry_size(self) -> usize

The on-disk size of one IFD entry in bytes (12 classic, 20 BigTIFF).

pub fn count_size(self) -> usize

The size of an IFD’s leading entry-count field in bytes (2 classic, 8 BigTIFF).

pub fn offset_size(self) -> usize

The size of a file offset (first-IFD pointer, next-IFD pointer, value offset) in bytes (4 classic, 8 BigTIFF).

pub fn inline_threshold(self) -> usize

The largest value, in bytes, that is stored inline in an IFD entry rather than out of line (4 classic, 8 BigTIFF — equal to Self::offset_size).

Trait Implementations

impl Clone for Variant

fn clone(&self) -> Variant

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Variant

impl Debug for Variant

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

Formats the value using the given formatter.

impl Eq for Variant

impl Hash for Variant

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Variant

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Variant