Enum FieldType 

pub enum FieldType {
    Byte,
    Ascii,
    Short,
    Long,
    Rational,
    SByte,
    Undefined,
    SShort,
    SLong,
    SRational,
    Float,
    Double,
    Long8,
    SLong8,
    Ifd8,
}

The type of a tag’s value, stored as the 2-byte Type of an IFD entry (TIFF 6.0 §2).

The discriminants match the on-disk codes (Byte is 1, Short is 3, Rational is 5, …). The first twelve are the TIFF 6.0 field types; the BigTIFF 64-bit additions (Long8/SLong8/Ifd8, codes 16–18) appear only when the bigtiff feature is enabled, so the set stays additive and a classic-only build treats those codes as unknown.

Variants

Byte

1 — an 8-bit unsigned integer.

Ascii

2 — an 8-bit byte holding a 7-bit ASCII code; NUL-terminated.

Short

3 — a 16-bit unsigned integer.

Long

4 — a 32-bit unsigned integer.

Rational

5 — two Longs: a fraction’s numerator then denominator.

SByte

6 — an 8-bit signed (two’s-complement) integer.

Undefined

7 — an 8-bit byte whose meaning depends on the field.

SShort

8 — a 16-bit signed (two’s-complement) integer.

SLong

9 — a 32-bit signed (two’s-complement) integer.

SRational

10 — two SLongs: a signed fraction’s numerator then denominator.

Float

11 — a 32-bit IEEE single-precision float.

Double

12 — a 64-bit IEEE double-precision float.

Long8

16 — a 64-bit unsigned integer (BigTIFF; references/tiff/bigtiff.html).

SLong8

17 — a 64-bit signed (two’s-complement) integer (BigTIFF).

Ifd8

18 — a 64-bit unsigned IFD offset (BigTIFF).

Implementations

impl FieldType

pub fn from_code(code: u16) -> Option<FieldType>

Returns the field type for an on-disk type code, or None for an unknown code.

Without the bigtiff feature, the 64-bit BigTIFF codes (16–18) are unknown and return None, so a classic-only reader skips fields of those types rather than failing.

pub fn code(self) -> u16

Returns the on-disk type code.

pub fn size(self) -> usize

Returns the number of bytes in a single value of this type.

Trait Implementations

impl Clone for FieldType

fn clone(&self) -> FieldType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FieldType

impl Debug for FieldType

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

Formats the value using the given formatter.

impl Eq for FieldType

impl PartialEq for FieldType

fn eq(&self, other: &FieldType) -> 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 FieldType