{
  "$schema": "../../../schema/test-vector.schema.json",
  "name": "Framing - Decode Only",
  "spec_ref": "src/01-wire-format.md",
  "protocol_version": 0,
  "description": "Tests one-way decode cases where the binary is valid to decode but may not be the canonical encoding a conformant encoder would produce.",
  "vectors": [
    {
      "id": "dec-001",
      "description": "Decode-only: ACK FLOOD with trailing bytes beyond the 4-byte CRC payload",
      "type": "decode_only",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "DEADBEEF"
        }
      },
      "binary": "0D 00 DEADBEEF 00",
      "notes": "Binary has 1 trailing byte after the 4-byte ACK CRC. Decoders MUST accept this (payload_len includes the extra byte). Encoders would not produce trailing bytes."
    },
    {
      "id": "dec-002",
      "description": "Decode-only: raw_custom FLOOD with path hash_count=0 but hash_size=2",
      "type": "decode_only",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "raw_custom",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 2,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "data": "AA"
        }
      },
      "binary": "3D 40 AA",
      "notes": "Path_len byte 0x40 encodes hash_size=2 (bits 6-7 = 01) with hash_count=0. Decoders must handle non-default hash_size even when hash_count is zero. Encoders typically default hash_size=1 when hash_count=0."
    },
    {
      "id": "dec-003",
      "description": "Decode-only: raw_custom FLOOD with path hash_size=3 and hash_count=0",
      "type": "decode_only",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "raw_custom",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 3,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "data": "BB"
        }
      },
      "binary": "3D 80 BB",
      "notes": "Path_len byte 0x80 encodes hash_size=3 (bits 6-7 = 10) with hash_count=0. Same as dec-002 but with hash_size=3."
    }
  ]
}