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Implement the on-the-wire codec layer of CCSDS 727.0-B-5 (CCSDS File Delivery Protocol) as a dependency-free embedded C11 library: - cfdp_common: protocol enumerations (PDU type, direction, transmission mode, directive and condition codes, etc.) and shared helpers - cfdp_pdu: fixed PDU header and File Data PDU serialize/deserialize, with 1-8 octet identifiers and 32/64-bit (large file) support - cfdp_directive: EOF, Finished, ACK, Metadata, NAK, Prompt and Keep Alive File Directive PDU codecs - cfdp_checksum: streaming, segment-order-independent modular checksum - cfdp_endian: big-endian integer helpers Add a worked example, 13 unit tests (round-trip plus known-vector and exact-wire-byte checks), implementation notes in docs/, and wire the Makefile to build the static library, example and tests. Update README. All buffers are caller-supplied; no heap usage. Optional TLV parameters, segment metadata, the 16-bit CRC and the transaction state machine are out of scope for this basic implementation. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J9x1fuXLkoZtEKGWmomnzi
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