created_at2019-04-16 16:32:49.833852
updated_at2022-02-13 15:36:43.84144
descriptionConverts between raw bytes and structured data.



[![Build Status](]( [![Build status](]( [![ Version](]( [![Docs](]( `restruct` is used to interpret binary data stored in files or other sources or convert between C structs and Rust types and when using a parser-generator is considered disproportionate. It is a brainchild of [Python's struct-module]( The library uses Format Strings as compact descriptions of the binary data and the intended conversion to/from Rust-types. The Format Strings are interpreted at compile-time to generate a type whose functions can be used to convert between unstructured and structured data. ```rust // Generate a parser in little-endian for two 32bit integers, a float and a bool. #[derive(restruct_derive::Struct)] #[fmt="<2if?"] struct FooParser; // Pack a tuple of two integers, a float and a bool into a [u8; _]-buffer. let packed = FooParser::pack((1, 2, 3.0, false)); assert_eq!(packed, [1, 0, 0, 0, 2, 0, 0, 0, 0, 0, 64, 64, 0]); assert_eq!(packed.len(), FooParser::SIZE); // Packing and unpacking can't fail at runtime. let unpacked = FooParser::unpack(packed); assert_eq!(unpacked, (1, 2, 3.0, false)); // Any `io::Read` can be used directly. let unpacked = FooParser::read_from(&mut &packed[..]).expect("i/o failed"); assert_eq!(unpacked, (1, 2, 3.0, false)); // Any `io::Write` can be used directly. let mut buffer = Vec::with_capacity(FooParser::SIZE); FooParser::write_to((1, 2, 3.0, false), &mut buffer).expect("i/o failed"); assert_eq!(&buffer, &packed); ``` ```rust,ignore // Because packing and unpacking is const we can use these functions to initialize other consts const TEAPOT: ::Unpacked = Tea::unpack(*include_bytes!("teapot.bin")); const TEAPOT_TEMPERATURE: i32 = TEAPOT.0; const TEAPOT_FILL_STATUS: f32 = TEAPOT.2; const TEAPOT_ACTIVE: bool = TEAPOT.3; ```
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cargo fmt