Crate smart_package_tracker 

Generate package tracking IDs and render them as barcodes.

use smart_package_tracker::{Barcode, RenderOptions, TrackingId};

// 1. Mint an identifier.
let id = TrackingId::generate()?;          // e.g. PKG-9ED9285C

// 2. Encode it as a Code 128 barcode.
let barcode = Barcode::code128(&id)?;

// 3. Export it.
let options = RenderOptions::default();    // 300 dpi, 13 mil, 25 mm tall
let png: Vec<u8> = barcode.to_png(&options)?;
let svg: String  = barcode.to_svg(&options)?;

assert_eq!(&png[..8], b"\x89PNG\r\n\x1a\n");
assert!(svg.contains("<svg"));

Design

The pipeline has two independent halves, joined by a dimension-agnostic bit grid:

TrackingId ──▶ Symbology::encode ──▶ Symbol ──▶ Renderer::render ──▶ bytes
               (Code 128)            (BitMatrix)  (Png | Svg)

A linear barcode is a one-row BitMatrix; a matrix symbology such as QR is a square one. Because renderers consume the grid rather than the symbology, adding a format means implementing Symbology and nothing else.

Both renderers share one Layout calculation, so PNG and SVG output describe identical geometry at identical physical size.

Choosing an entropy width

TrackingId::generate defaults to 32 bits of randomness — the familiar PKG-9ED9285C shape — which collides with ~69% probability once 100,000 IDs have been issued. Production systems should configure 64 bits:

use smart_package_tracker::{Checksum, IdGenerator};

let generator = IdGenerator::builder()
    .entropy_bits(64)
    .checksum(Checksum::Iso7064Mod37_36)
    .build()?;

See IdGenerator for the full collision table.

Feature flags

Feature	Default	Effect
std	yes	File helpers and std::error::Error. Without it the crate is no_std + alloc.
os-rng	yes	Seed IDs from the OS CSPRNG. Turn off on targets getrandom does not support; IdGenerator::generate_from_entropy still works.
code128	yes	Code 128 encoding and decoding.
png	yes	PNG rendering. Implies std.
svg	yes	SVG rendering. No extra dependencies.
serde	no	Serialize/Deserialize for the public data types.

Not yet implemented

QR codes, image scanning, shipment events, and carrier integrations are deliberately absent. The Symbology and Renderer traits are the extension points for the first two; carrier integrations belong in separate crates, so that network I/O and vendor licence terms stay out of this dependency graph.

Re-exports

pub use error::Error;

pub use error::Result;

pub use id::Checksum;

pub use id::IdGenerator;

pub use id::IdGeneratorBuilder;

pub use id::TrackingId;

pub use render::hri_supports;

pub use render::Color;

pub use render::Length;

pub use render::QuietZone;

pub use render::RenderOptions;

pub use render::RenderOptionsBuilder;

pub use symbology::Symbol;

pub use symbology::SymbologyKind;

pub use symbology::Code128;code128

Modules

error

Error types for this crate.

id

Tracking identifiers.

render

Turning Symbols into images.

symbology

Turning payloads into bit patterns.

Structs

Barcode

An encoded barcode, ready to render.