60 lines
1.4 KiB
Rust
60 lines
1.4 KiB
Rust
//! Marathon Shapes format handling.
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pub mod bmap;
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pub mod clut;
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pub mod coll;
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pub mod fram;
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pub mod sequ;
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use crate::{bin::usize_from_u32, err::*};
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use std::io::prelude::*;
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/// Reads a collection at an offset provided by the Shapes header.
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pub fn read_coll_at_offset(b: &[u8],
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ofs: u32,
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len: usize) -> ResultS<Option<coll::Collection>>
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{
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if ofs != u32::max_value() {
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let ofs = usize_from_u32(ofs);
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let dat = ok!(b.get(ofs..ofs + len), "bad offset")?;
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Ok(Some(coll::read(dat)?))
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} else {
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Ok(None)
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}
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}
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/// Read all of the collections in a Shapes file.
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pub fn read(fp: &mut impl Read) -> ResultS<Collections>
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{
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let mut b = Vec::new();
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fp.read_to_end(&mut b)?;
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let mut collections = vec![(None, None); 32];
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for (i, co) in collections.iter_mut().enumerate() {
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read_data! {
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endian: BIG, buf: &b, size: 32, start: i * 32, data {
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let lo_ofs = u32[4];
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let lo_len = u32[8] usize;
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let hi_ofs = u32[12];
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let hi_len = u32[16] usize;
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}
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}
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let lo = read_coll_at_offset(&b, lo_ofs, lo_len)?;
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let hi = read_coll_at_offset(&b, hi_ofs, hi_len)?;
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*co = (lo, hi);
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}
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Ok(collections)
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}
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/// A collection, which may have low- and high-definition variations, or none.
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pub type CollectionDef = (Option<coll::Collection>, Option<coll::Collection>);
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/// The set of all collections in a Shapes file.
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pub type Collections = Vec<CollectionDef>;
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// EOF
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