Function: decodeAstmFrames()

decodeAstmFrames(bytes, options?): DecodeAstmFramesResult

Decode a framed ASTM byte stream into frames + reassembled record bytes.

Bytes outside a frame (before the first STX, or between a frame's trailing LF and the next STX) are skipped: in ASTM they are low-level transfer control (ENQ/ACK/NAK/EOT), never record content, so skipping them is not data loss.

Parameters

bytes

Uint8Array

The framed byte stream.

options?

FrameOptions = {}

Decode options; lenient unless strict is set.

Returns

DecodeAstmFramesResult

The decoded frames, the reassembled trusted record bytes, and any warnings.

Throws

AstmParseError with EMPTY_INPUT when bytes is empty (both modes).

Throws

AstmFrameStrictError when strict is set and any deviation occurred.

Example

import { decodeAstmFrames } from "@cosyte/astm";
// One final frame carrying the record text "R|1|": checksum "AF" over FN..ETX (mod 256).
const bytes = new Uint8Array([0x02, 0x31, 0x52, 0x7c, 0x31, 0x7c, 0x03, 0x41, 0x46, 0x0d, 0x0a]);
const { records, frames } = decodeAstmFrames(bytes);
frames[0]?.frameNumber; // 1
records.length;         // 1