# argus-chunk
[](https://crates.io/crates/argus-chunk)
[](https://docs.rs/argus-chunk)


> Round his head Argus had a hundred eyes.
> These eyes took turns resting two at a time,
> while the others kept watching and remained
> on guard. No matter where he was standing,
> he could see Io.
> — _[Metamorphoses][ovid]_
**Argus watches over chunk IO** — little-endian wire primitives, bounds-checked
spans, and raw/zstd payload codecs.
Shared foundation for [Tetration](https://github.com/Latka-Industries/tetration)
(`.tet`) and [Tessera](https://github.com/Latka-Industries/tessera) (`.tes`).
Product-specific superblocks, index rows, and catalogs stay in those crates.
```rust
use argus::{MappedFile, codec, le};
let map = MappedFile::open("note.tes")?;
let mut r = le::LeReader::require(map.as_bytes(), "superblock", 64)?;
let magic = r.take_4();
```
## Modules
| [`le`](src/le.rs) | `align8`, `LeReader` / `LeWriter`, span checks |
| [`codec`](src/codec.rs) | payload codec `0` (raw) / `1` (zstd) |
| [`mmap`](src/mmap.rs) | `MappedFile` — keep `File` + `Mmap` alive |
Import as `argus` (`[lib] name = "argus"`).
## License
Dual-licensed under [MIT](LICENSE-MIT) or [Apache-2.0](LICENSE-APACHE).
[ovid]: https://bookshop.org/p/books/ovid-metamorphoses-brandino-rangoni-machiavelli/cf9e73ac875648ee?ean=9780244075248&bkshp-astro=t