Trait Backend 

pub trait Backend: Sized {
    // Required methods
    fn read<T: IndexRange>(&self, range: T) -> Result<&[u8]>;
    fn len(&self) -> usize;

    // Provided methods
    fn is_empty(&self) -> bool { ... }
    fn locate_start_offset(&self) -> Result<usize> { ... }
    fn locate_xref_offset(&self) -> Result<usize> { ... }
    fn read_xref_table_and_trailer(
        &self,
        start_offset: usize,
        resolve: &impl Resolve,
    ) -> Result<(XRefTable, Dictionary)> { ... }
}

Required Methods

fn read<T: IndexRange>(&self, range: T) -> Result<&[u8]>

fn len(&self) -> usize

Provided Methods

fn is_empty(&self) -> bool

fn locate_start_offset(&self) -> Result<usize>

Returns the offset of the beginning of the file, i.e., where the %PDF-1.5 header is. (currently only used internally!)

fn locate_xref_offset(&self) -> Result<usize>

Returns the value of startxref (currently only used internally!)

fn read_xref_table_and_trailer( &self, start_offset: usize, resolve: &impl Resolve, ) -> Result<(XRefTable, Dictionary)>

Used internally by File, but could also be useful for applications that want to look at the raw PDF objects.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T> Backend for T

where T: Deref<Target = [u8]>,