Crate copybook_rdw 

RDW (Record Descriptor Word) header primitives.

This crate intentionally focuses on one concern: parsing and constructing RDW framing metadata plus minimal buffered helpers.

The RDW format prefixes each variable-length record with a 4-byte header (2-byte big-endian payload length + 2 reserved bytes). Use RDWRecordReader and RDWRecordWriter for streaming record I/O, or the lower-level helpers (rdw_read_len, rdw_slice_body) for custom framing.

Structs

RDWRecord

An RDW record with header and payload bytes.

RDWRecordReader

RDW (Record Descriptor Word) record reader for variable-length records.

RDWRecordWriter

RDW record writer for variable-length records.

RdwHeader

Parsed RDW header (length + reserved).

Constants

RDW_HEADER_LEN

Size of an RDW header in bytes.

RDW_MAX_PAYLOAD_LEN

Maximum payload size representable in RDW (u16::MAX).

Functions

rdw_is_suspect_ascii_corruption

Heuristic to detect ASCII-corrupted RDW headers.

rdw_payload_len_to_u16

Convert payload length to u16 with RDW error mapping.

rdw_read_len

Read a 2-byte big-endian RDW body length and consume those two bytes.

rdw_slice_body

Borrow the RDW body slice for len bytes without consuming.

rdw_try_peek_len

Probe if enough bytes exist to attempt RDW length parsing.

rdw_validate_and_finish

Placeholder for future RDW body validation hooks.