Struct Ptr

pub struct Ptr<'buf, S> {
    pub offset: isize,
    pub buf: &'buf [u8],
    /* private fields */
}

A reference to a fontconfig struct that’s been serialized in a buffer.

Fields

offset: isize

We point at this offset, relative to the buffer.

buf: &'buf [u8]

The buffer that we point into.

Implementations

impl<'buf> Ptr<'buf, u8>

pub fn str(&self) -> Result<&'buf [u8], Error>

Assuming that this Ptr<u8> is pointing to the beginning of a null-terminated string, return that string.

impl<'buf, S: AnyBitPattern> Ptr<'buf, S>

pub fn relative_offset<Off: IntoOffset>( &self, offset: Off, ) -> Result<Ptr<'buf, Off::Item>, Error>

Turn offset into a pointer, assuming that it’s an offset relative to this pointer.

In order to be certain about which offsets are relative to what, you’ll need to check the fontconfig source. But generally, offsets stored in a struct are relative to the base address of that struct. So for example, to access the dir field in Cache you could call cache.relative_offset(cache.deref()?.dir)?. This will give you a Ptr<u8> pointing to the start of the directory name.

pub fn deref(&self) -> Result<S, Error>

“Dereference” this pointer, returning a plain struct.

pub fn array(&self, count: c_int) -> Result<Array<'buf, S>, Error>

Treating this pointer as a reference to the start of an array of length count, return an iterator over that array.

impl<'buf> Ptr<'buf, ValueData>

pub fn to_value(&self) -> Result<Value<'buf>, Error>

Converts the raw C representation to an enum.

Trait Implementations

impl<'buf, S: Clone> Clone for Ptr<'buf, S>

fn clone(&self) -> Ptr<'buf, S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'buf, S> Debug for Ptr<'buf, S>

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

Formats the value using the given formatter.