Struct Cursor

pub struct Cursor<'a> {
    pos: usize,
    data: FontData<'a>,
}

A cursor for validating bytes during parsing.

This type improves the ergonomics of validation blah blah

Note

call finish when you’re done to ensure you’re in bounds

Fields

pos: usize

data: FontData<'a>

Implementations

impl<'a> Cursor<'a>

pub(crate) fn advance<T: Scalar>(&mut self)

pub(crate) fn advance_by(&mut self, n_bytes: usize)

pub(crate) fn read_u32_var(&mut self) -> Result<u32, ReadError>

Read a variable length u32 and advance the cursor

pub(crate) fn read<T: Scalar>(&mut self) -> Result<T, ReadError>

Read a scalar and advance the cursor.

pub(crate) fn read_be<T: Scalar>(&mut self) -> Result<BigEndian<T>, ReadError>

Read a big-endian value and advance the cursor.

pub(crate) fn read_with_args<T>( &mut self, args: &T::Args, ) -> Result<T, ReadError>

where T: FontReadWithArgs<'a> + ComputeSize,

pub(crate) fn read_computed_array<T>( &mut self, len: usize, args: &T::Args, ) -> Result<ComputedArray<'a, T>, ReadError>

where T: FontReadWithArgs<'a> + ComputeSize,

pub(crate) fn read_array<T: AnyBitPattern + FixedSize>( &mut self, n_elem: usize, ) -> Result<&'a [T], ReadError>

pub(crate) fn position(&self) -> Result<usize, ReadError>

return the current position, or an error if we are out of bounds

pub(crate) fn remaining_bytes(&self) -> usize

pub(crate) fn remaining(self) -> Option<FontData<'a>>

pub fn is_empty(&self) -> bool

pub(crate) fn finish<T>(self, shape: T) -> Result<TableRef<'a, T>, ReadError>

Trait Implementations

impl<'a> Clone for Cursor<'a>

fn clone(&self) -> Cursor<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Cursor<'a>

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

Formats the value using the given formatter.

impl<'a> Default for Cursor<'a>

fn default() -> Cursor<'a>

Returns the “default value” for a type.

impl<'a> Copy for Cursor<'a>