Crate squitter 

A no_std, allocation-free parser and encoder for ADS-B (Automatic Dependent Surveillance-Broadcast) messages, per the Mode S extended squitter format (Downlink Format 17), as commonly represented as raw hex frames (e.g. dump1090’s *8D4840D6202CC371C32CE0576098; format).

Layering

• frame parses and CRC-24-validates a hex-encoded DF17 frame.
• bits reads and writes arbitrary-width fields directly against the frame’s plain binary bytes.
• message decodes/encodes the bit-packed ME field into a typed AdsbMessage, one variant per supported type-code family.

No allocation

Nothing in this crate uses alloc.

Re-exports

pub use error::AdsbError;

pub use frame::Frame;

pub use message::AdsbMessage;

Modules

bits

Bit-level codec for Mode S frame data.

crc

Mode S CRC-24, the frame-integrity layer for DF17 (analogous to NMEA’s XOR checksum for AIS, but a real cyclic redundancy check).

error

Error types for every layer of the decode/encode pipeline.

frame

Raw Mode S DF17 frame parsing: hex text to a checksum-validated, 112-bit/14-byte frame. Analogous to aivdm’s nmea::Sentence::parse, but the wire format here is a plain hex string rather than a comma-delimited NMEA sentence with six-bit ASCII armor.

message

Type-code-dispatched decoding/encoding of a DF17 frame’s ME field into a typed AdsbMessage.

string

The Mode S six-bit callsign alphabet (ICAO Annex 10 Vol IV), used by aircraft identification messages. Distinct from AIS’s six-bit ASCII alphabet (different domain, different mapping): A-Z are 1..=26, 0-9 are 48..=57, space is 32; everything else is unused.

Functions

decode_line

Decodes a single hex-encoded DF17 frame into a typed ADS-B message.

encode_frame

Encodes a typed ADS-B message into a full DF17 Frame, given the transmitting aircraft’s 24-bit ICAO address and transponder capability level (only the low 24/3 bits of each are used, respectively).