Lines
53.33 %
Functions
66.67 %
Branches
100 %
//! Top-level font file representation.
use std::borrow::Cow;
use crate::binary::read::{ReadBinary, ReadCtxt};
use crate::error::{ParseError, ReadWriteError};
use crate::tables::{
FontTableProvider, OpenTypeFont, SfntVersion, CFF_MAGIC, TRUE_MAGIC, TTCF_MAGIC, TTF_MAGIC,
};
use crate::woff::{self, WoffFont};
use crate::woff2::{self, Woff2Font};
/// Type that can represent any of the supported font formats.
#[derive(Clone)]
pub enum FontData<'a> {
OpenType(OpenTypeFont<'a>),
Woff(WoffFont<'a>),
Woff2(Woff2Font<'a>),
}
/// Generic implementation of the `FontTableProvider` trait
pub struct DynamicFontTableProvider<'a> {
sfnt_version: u32,
provider: Box<dyn FontTableProvider + Send + Sync + 'a>,
impl ReadBinary for FontData<'_> {
type HostType<'a> = FontData<'a>;
fn read<'a>(ctxt: &mut ReadCtxt<'a>) -> Result<Self::HostType<'a>, ParseError> {
let mut peek = ctxt.clone();
let magic = peek.read_u32be()?;
match magic {
TTF_MAGIC | TRUE_MAGIC | CFF_MAGIC => Ok(FontData::OpenType(OpenTypeFont::read(ctxt)?)),
TTCF_MAGIC => Ok(FontData::OpenType(OpenTypeFont::read(ctxt)?)),
woff::MAGIC => Ok(FontData::Woff(WoffFont::read(ctxt)?)),
woff2::MAGIC => Ok(FontData::Woff2(Woff2Font::read(ctxt)?)),
_ => Err(ParseError::BadVersion),
impl FontTableProvider for DynamicFontTableProvider<'_> {
fn table_data(&self, tag: u32) -> Result<Option<Cow<'_, [u8]>>, ParseError> {
self.provider.table_data(tag)
fn has_table(&self, tag: u32) -> bool {
self.provider.has_table(tag)
fn table_tags(&self) -> Option<Vec<u32>> {
self.provider.table_tags()
impl SfntVersion for DynamicFontTableProvider<'_> {
fn sfnt_version(&self) -> u32 {
self.sfnt_version
impl<'a> FontData<'a> {
/// Obtain an implementation of `FontTableProvider` for this font.
pub fn table_provider(
&self,
index: usize,
) -> Result<DynamicFontTableProvider<'a>, ReadWriteError> {
match self {
FontData::OpenType(font) => {
let provider = font.table_provider(index)?;
Ok(DynamicFontTableProvider {
sfnt_version: provider.sfnt_version(),
provider: Box::new(provider),
})
FontData::Woff(font) => {
// This clone is relatively cheap as WoffFile is mostly holding borrowed data
sfnt_version: font.sfnt_version(),
provider: Box::new(font.clone()),
FontData::Woff2(font) => {