use crate::GlyphId;
use crate::parser::{Stream, FromData, LazyArray16};
use super::StringId;
pub const STANDARD_ENCODING: [u8;256] = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64,
65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110,
0, 111, 112, 113, 114, 0, 115, 116, 117, 118, 119, 120, 121, 122, 0, 123,
0, 124, 125, 126, 127, 128, 129, 130, 131, 0, 132, 133, 0, 134, 135, 136,
137, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 138, 0, 139, 0, 0, 0, 0, 140, 141, 142, 143, 0, 0, 0, 0,
0, 144, 0, 0, 0, 145, 0, 0, 146, 147, 148, 149, 0, 0, 0, 0,
];
const EXPERT_ENCODING: &[u16] = &[
0, 1, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 13, 14, 15, 99,
239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 27, 28, 249, 250, 251, 252,
253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 109, 110,
267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282,
283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298,
299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314,
315, 316, 317, 318, 158, 155, 163, 319, 320, 321, 322, 323, 324, 325, 326, 150,
164, 169, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340,
341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356,
357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372,
373, 374, 375, 376, 377, 378,
];
const EXPERT_SUBSET_ENCODING: &[u16] = &[
0, 1, 231, 232, 235, 236, 237, 238, 13, 14, 15, 99, 239, 240, 241, 242,
243, 244, 245, 246, 247, 248, 27, 28, 249, 250, 251, 253, 254, 255, 256, 257,
258, 259, 260, 261, 262, 263, 264, 265, 266, 109, 110, 267, 268, 269, 270, 272,
300, 301, 302, 305, 314, 315, 158, 155, 163, 320, 321, 322, 323, 324, 325, 326,
150, 164, 169, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339,
340, 341, 342, 343, 344, 345, 346
];
#[derive(Clone, Copy, Debug)]
pub(crate) struct Format1Range {
first: StringId,
left: u8,
}
impl FromData for Format1Range {
const SIZE: usize = 3;
#[inline]
fn parse(data: &[u8]) -> Option<Self> {
let mut s = Stream::new(data);
Some(Format1Range {
first: s.read::<StringId>()?,
left: s.read::<u8>()?,
})
}
}
#[derive(Clone, Copy, Debug)]
pub(crate) struct Format2Range {
first: StringId,
left: u16,
}
impl FromData for Format2Range {
const SIZE: usize = 4;
#[inline]
fn parse(data: &[u8]) -> Option<Self> {
let mut s = Stream::new(data);
Some(Format2Range {
first: s.read::<StringId>()?,
left: s.read::<u16>()?,
})
}
}
#[derive(Clone, Copy, Debug)]
pub(crate) enum Charset<'a> {
ISOAdobe,
Expert,
ExpertSubset,
Format0(LazyArray16<'a, StringId>),
Format1(LazyArray16<'a, Format1Range>),
Format2(LazyArray16<'a, Format2Range>),
}
impl Charset<'_> {
pub fn sid_to_gid(&self, sid: StringId) -> Option<GlyphId> {
if sid.0 == 0 {
return Some(GlyphId(0));
}
match self {
Charset::ISOAdobe | Charset::Expert | Charset::ExpertSubset => None,
Charset::Format0(ref array) => {
array.into_iter().position(|n| n == sid).map(|n| GlyphId(n as u16 + 1))
}
Charset::Format1(array) => {
let mut glyph_id = GlyphId(1);
for range in *array {
let last = u32::from(range.first.0) + u32::from(range.left);
if range.first <= sid && u32::from(sid.0) <= last {
glyph_id.0 += sid.0 - range.first.0;
return Some(glyph_id)
}
glyph_id.0 += u16::from(range.left) + 1;
}
None
}
Charset::Format2(array) => {
let mut glyph_id = GlyphId(1);
for range in *array {
let last = u32::from(range.first.0) + u32::from(range.left);
if sid >= range.first && u32::from(sid.0) <= last {
glyph_id.0 += sid.0 - range.first.0;
return Some(glyph_id)
}
glyph_id.0 += range.left + 1;
}
None
}
}
}
pub fn gid_to_sid(&self, gid: GlyphId) -> Option<StringId> {
match self {
Charset::ISOAdobe => {
if gid.0 <= 228 { Some(StringId(gid.0)) } else { None }
}
Charset::Expert => {
EXPERT_ENCODING.get(usize::from(gid.0)).cloned().map(StringId)
}
Charset::ExpertSubset => {
EXPERT_SUBSET_ENCODING.get(usize::from(gid.0)).cloned().map(StringId)
}
Charset::Format0(ref array) => {
if gid.0 == 0 {
Some(StringId(0))
} else {
array.get(gid.0 - 1)
}
}
Charset::Format1(array) => {
if gid.0 == 0 {
Some(StringId(0))
} else {
let mut sid = gid.0 - 1;
for range in *array {
if sid <= u16::from(range.left) {
sid = sid.checked_add(range.first.0)?;
return Some(StringId(sid));
}
sid = sid.checked_sub(u16::from(range.left) + 1)?;
}
None
}
}
Charset::Format2(array) => {
if gid.0 == 0 {
Some(StringId(0))
} else {
let mut sid = gid.0 - 1;
for range in *array {
if sid <= range.left {
sid = sid.checked_add(range.first.0)?;
return Some(StringId(sid));
}
sid = sid.checked_sub(range.left.checked_add(1)?)?;
}
None
}
}
}
}
}
pub(crate) fn parse_charset<'a>(number_of_glyphs: u16, s: &mut Stream<'a>) -> Option<Charset<'a>> {
if number_of_glyphs < 2 {
return None;
}
let format: u8 = s.read()?;
match format {
0 => Some(Charset::Format0(s.read_array16::<StringId>(number_of_glyphs - 1)?)),
1 => {
let mut count = 0;
{
let mut s = s.clone();
let mut total_left = number_of_glyphs - 1;
while total_left > 0 {
s.skip::<StringId>(); let left: u8 = s.read()?;
total_left = total_left.checked_sub(u16::from(left) + 1)?;
count += 1;
}
}
s.read_array16::<Format1Range>(count).map(Charset::Format1)
}
2 => {
let mut count = 0;
{
let mut s = s.clone();
let mut total_left = number_of_glyphs - 1;
while total_left > 0 {
s.skip::<StringId>(); let left: u16 = s.read()?;
let left = left.checked_add(1)?;
total_left = total_left.checked_sub(left)?;
count += 1;
}
}
s.read_array16::<Format2Range>(count).map(Charset::Format2)
}
_ => None,
}
}