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use core::num::NonZeroU16;
use core::ops::Range;
use crate::{GlyphId, IndexToLocationFormat};
use crate::parser::{Stream, LazyArray16, NumFrom};
#[derive(Clone, Copy)]
pub(crate) enum Table<'a> {
Short(LazyArray16<'a, u16>),
Long(LazyArray16<'a, u32>),
}
impl<'a> Table<'a> {
pub fn parse(
data: &'a [u8],
number_of_glyphs: NonZeroU16,
format: IndexToLocationFormat,
) -> Option<Self> {
let total = if number_of_glyphs.get() == core::u16::MAX {
number_of_glyphs.get()
} else {
number_of_glyphs.get() + 1
};
let mut s = Stream::new(data);
match format {
IndexToLocationFormat::Short => {
Some(Table::Short(s.read_array16::<u16>(total)?))
}
IndexToLocationFormat::Long => {
Some(Table::Long(s.read_array16::<u32>(total)?))
}
}
}
#[inline]
fn len(&self) -> u16 {
match self {
Table::Short(ref array) => array.len(),
Table::Long(ref array) => array.len(),
}
}
#[inline]
pub fn glyph_range(&self, glyph_id: GlyphId) -> Option<Range<usize>> {
let glyph_id = glyph_id.0;
if glyph_id == core::u16::MAX {
return None;
}
if glyph_id + 1 >= self.len() {
return None;
}
let range = match self {
Table::Short(ref array) => {
usize::from(array.get(glyph_id)?) * 2 .. usize::from(array.get(glyph_id + 1)?) * 2
}
Table::Long(ref array) => {
usize::num_from(array.get(glyph_id)?) .. usize::num_from(array.get(glyph_id + 1)?)
}
};
if range.start >= range.end {
None
} else {
Some(range)
}
}
}