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deserialize(reader: R) -> Result { + bincode::options().with_big_endian().with_fixint_encoding().deserialize_from::(reader) +} + +#[derive(Debug)] +pub struct Font { + data_source: BufReader, + table_directory: TableDirectory +} + +impl Font { + pub fn new(reader: R) -> Result { + let mut buf_reader = BufReader::new(reader); + let table_directory = TableDirectory::new(&mut buf_reader)?; + + Ok(Font { + data_source: buf_reader, + table_directory: table_directory + }) + } +} + diff --git a/src/font/table_directory.rs b/src/font/table_directory.rs new file mode 100644 index 0000000..f213956 --- /dev/null +++ b/src/font/table_directory.rs @@ -0,0 +1,39 @@ +use std::{collections::HashMap, io::{Read, Seek}}; + +use bincode::Result; +use serde::Deserialize; + +use crate::font::deserialize; + +#[derive(Deserialize, Debug)] +struct TableDirectoryHeader { + sfnt_version: u32, + num_tables: u16, +} + +#[derive(Deserialize, Debug)] +struct TableDirectoryRecord { + pub table_tag: u32, + pub checksum: u32, + pub offset: u32, + pub length: u32 +} + +#[derive(Debug, Default)] +pub struct TableDirectory(pub HashMap); + +impl TableDirectory { + pub fn new(reader: &mut R) -> Result { + let header: TableDirectoryHeader = deserialize(reader.by_ref())?; + let mut tables: HashMap = HashMap::with_capacity(header.num_tables as usize); + + reader.seek_relative(3 * size_of::() as i64)?; + + for _ in 0..header.num_tables { + let record: TableDirectoryRecord = deserialize(reader.by_ref())?; + tables.insert(record.table_tag, record); + } + + Ok(TableDirectory(tables)) + } +} diff --git a/src/main.rs b/src/main.rs index e7a11a9..0bf4425 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,24 @@ -fn main() { - println!("Hello, world!"); +mod font; + +use std::{fs::File, io::Result}; + +use clap::Parser; +use font::Font; + +#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +struct Args { + file: String +} + +fn main() -> Result<()> { + let args = Args::parse(); + let font = Font::new(File::open(args.file)?); + let Ok(font) = font else { + panic!("{}", font.unwrap_err().to_string()); + }; + + dbg!(font); + + Ok(()) }