GSM 7-bit character encoding and decoding library.

This library provides efficient encoding and decoding of text using the GSM 7-bit character set as defined in GSM 03.38. This encoding is commonly used in SMS messages.

Example

use gsm7::{encode, decode};

let text = "Hello {world} €!";
let encoded = encode(text)?;
let decoded = decode(&encoded)?;
assert_eq!(decoded, text);

gsm7-alt

This crate is really a “GSM 7-bit character set mapper”, not a full “GSM 7-bit encoder” in the SMS sense.

This crate provides:

Mapping between Unicode text and the GSM 7-bit character set (base + extension table).

Configurable handling of unsupported characters.

Utilities for checking compatibility and estimating length.

⚠️ Important: This crate currently maps characters to GSM 7-bit codes but does not perform septet packing (the bit-level compression used in SMS PDUs). If you need to generate raw SMS payloads, you must add an additional packing step.

Example usage: let decoded = gsm7_alt::decode(&data).map_err(|e| e.to_string())?;

use gsm7_alt::{encode, decode};

fn main() -> Result<(), Box> { let text = "Hello {world} €!";

let encoded = encode(text)?;
let decoded = decode(&encoded)?;

assert_eq!(decoded, text);
println!("Decoded text: {}", decoded);

Ok(())

}