read_fonts/generated/
generated_ltag.rs

1// THIS FILE IS AUTOGENERATED.
2// Any changes to this file will be overwritten.
3// For more information about how codegen works, see font-codegen/README.md
4
5#[allow(unused_imports)]
6use crate::codegen_prelude::*;
7
8impl<'a> MinByteRange<'a> for Ltag<'a> {
9    fn min_byte_range(&self) -> Range<usize> {
10        0..self.tag_ranges_byte_range().end
11    }
12    fn min_table_bytes(&self) -> &'a [u8] {
13        let range = self.min_byte_range();
14        self.data.as_bytes().get(range).unwrap_or_default()
15    }
16}
17
18impl TopLevelTable for Ltag<'_> {
19    /// `ltag`
20    const TAG: Tag = Tag::new(b"ltag");
21}
22
23impl ReadArgs for Ltag<'_> {
24    type Args = ();
25}
26
27impl<'a> FontRead<'a> for Ltag<'a> {
28    fn read_with_args(data: FontData<'a>, _: ()) -> Result<Self, ReadError> {
29        #[allow(clippy::absurd_extreme_comparisons)]
30        if data.len() < Self::MIN_SIZE {
31            return Err(ReadError::OutOfBounds);
32        }
33        Ok(Self { data })
34    }
35}
36
37/// The [language tag](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html) table.
38#[derive(Clone)]
39pub struct Ltag<'a> {
40    data: FontData<'a>,
41}
42
43#[allow(clippy::needless_lifetimes)]
44impl<'a> Ltag<'a> {
45    pub const MIN_SIZE: usize = (u32::RAW_BYTE_LEN + u32::RAW_BYTE_LEN + u32::RAW_BYTE_LEN);
46    basic_table_impls!(impl_the_methods);
47
48    /// Table version; currently 1.
49    pub fn version(&self) -> u32 {
50        let range = self.version_byte_range();
51        self.data.read_at(range.start).ok().unwrap()
52    }
53
54    /// Table flags; currently none defined.
55    pub fn flags(&self) -> u32 {
56        let range = self.flags_byte_range();
57        self.data.read_at(range.start).ok().unwrap()
58    }
59
60    /// Number of language tags which follow.
61    pub fn num_tags(&self) -> u32 {
62        let range = self.num_tags_byte_range();
63        self.data.read_at(range.start).ok().unwrap()
64    }
65
66    /// Range of each tag's string.
67    pub fn tag_ranges(&self) -> &'a [FTStringRange] {
68        let range = self.tag_ranges_byte_range();
69        self.data.read_array(range).ok().unwrap_or_default()
70    }
71
72    pub fn version_byte_range(&self) -> Range<usize> {
73        let start = 0;
74        let end = start + u32::RAW_BYTE_LEN;
75        start..end
76    }
77
78    pub fn flags_byte_range(&self) -> Range<usize> {
79        let start = self.version_byte_range().end;
80        let end = start + u32::RAW_BYTE_LEN;
81        start..end
82    }
83
84    pub fn num_tags_byte_range(&self) -> Range<usize> {
85        let start = self.flags_byte_range().end;
86        let end = start + u32::RAW_BYTE_LEN;
87        start..end
88    }
89
90    pub fn tag_ranges_byte_range(&self) -> Range<usize> {
91        let num_tags = self.num_tags();
92        let start = self.num_tags_byte_range().end;
93        let end =
94            start + (transforms::to_usize(num_tags)).saturating_mul(FTStringRange::RAW_BYTE_LEN);
95        start..end
96    }
97}
98
99const _: () = assert!(FontData::default_data_long_enough(Ltag::MIN_SIZE));
100
101impl Default for Ltag<'_> {
102    fn default() -> Self {
103        Self {
104            data: FontData::default_table_data(),
105        }
106    }
107}
108
109/// Offset and length of string in `ltag` table.
110#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Copy, bytemuck :: AnyBitPattern)]
111#[repr(C)]
112#[repr(packed)]
113pub struct FTStringRange {
114    /// Offset from the start of the table to the beginning of the string.
115    pub offset: BigEndian<u16>,
116    /// String length (in bytes).
117    pub length: BigEndian<u16>,
118}
119
120impl FTStringRange {
121    /// Offset from the start of the table to the beginning of the string.
122    pub fn offset(&self) -> u16 {
123        self.offset.get()
124    }
125
126    /// String length (in bytes).
127    pub fn length(&self) -> u16 {
128        self.length.get()
129    }
130}
131
132impl FixedSize for FTStringRange {
133    const RAW_BYTE_LEN: usize = u16::RAW_BYTE_LEN + u16::RAW_BYTE_LEN;
134}
read_fonts/generated/generated_ltag.rs

read_fonts/generated/
generated_ltag.rs
