copybook-fixed

Fixed-length (LRECL) record framing primitives for copybook-rs.

Overview

This crate provides streaming reader and writer types for fixed-length record framing. FixedRecordReader consumes LRECL-sized records from a byte stream, while FixedRecordWriter produces them with automatic null-byte padding for short payloads.

Usage

use copybook_fixed::{FixedRecordReader, FixedRecordWriter};
use std::io::Cursor;

// Write fixed-length records (LRECL = 8)
let mut output = Vec::new();
let mut writer = FixedRecordWriter::new(&mut output, Some(8)).unwrap();
writer.write_record(b"ABCD").unwrap(); // padded to 8 bytes
writer.flush().unwrap();

// Read fixed-length records
let mut reader = FixedRecordReader::new(Cursor::new(&output), Some(8)).unwrap();
let record = reader.read_record().unwrap().unwrap();
assert_eq!(&record[..4], b"ABCD");

Public API

• FixedRecordReader<R> — Streaming reader for fixed-length records
• FixedRecordWriter<W> — Streaming writer with automatic padding

License

AGPL-3.0-or-later