{
  "$schema": "../../schema/test-vector.schema.json",
  "name": "Path - Hash Counts",
  "spec_ref": "spec/03-path.md",
  "protocol_version": 0,
  "description": "Tests various hash count values including zero, small, and maximum values for each hash size.",
  "vectors": [
    {
      "id": "hc-000",
      "description": "Zero hops (hash_count=0, hash_size=1) - empty path",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 00 01000000",
      "notes": "path_len=0x00. Zero-length path."
    },
    {
      "id": "hc-001",
      "description": "Zero hops with hash_size=2 - still empty path",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 2,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 40 01000000",
      "notes": "path_len=0x40: hash_size=2, count=0. Path is still 0 bytes even though hash_size>1."
    },
    {
      "id": "hc-002",
      "description": "Zero hops with hash_size=3",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 3,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 80 01000000",
      "notes": "path_len=0x80: hash_size=3, count=0. Path is 0 bytes."
    },
    {
      "id": "hc-010",
      "description": "Maximum count for hash_size=1: 63 hops, 63 bytes",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 63,
          "hashes": [
            "01",
            "02",
            "03",
            "04",
            "05",
            "06",
            "07",
            "08",
            "09",
            "0A",
            "0B",
            "0C",
            "0D",
            "0E",
            "0F",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19",
            "1A",
            "1B",
            "1C",
            "1D",
            "1E",
            "1F",
            "20",
            "21",
            "22",
            "23",
            "24",
            "25",
            "26",
            "27",
            "28",
            "29",
            "2A",
            "2B",
            "2C",
            "2D",
            "2E",
            "2F",
            "30",
            "31",
            "32",
            "33",
            "34",
            "35",
            "36",
            "37",
            "38",
            "39",
            "3A",
            "3B",
            "3C",
            "3D",
            "3E",
            "3F"
          ]
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 3F 0102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F303132333435363738393A3B3C3D3E3F 01000000",
      "notes": "path_len=0x3F: hash_size=1, count=63. Path: 63 bytes. Maximum valid path for 1-byte hashes."
    },
    {
      "id": "hc-020",
      "description": "Maximum count for hash_size=2: 32 hops, 64 bytes (exactly MAX_PATH_SIZE)",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 2,
          "hash_count": 32,
          "hashes": [
            "0001",
            "0203",
            "0405",
            "0607",
            "0809",
            "0A0B",
            "0C0D",
            "0E0F",
            "1011",
            "1213",
            "1415",
            "1617",
            "1819",
            "1A1B",
            "1C1D",
            "1E1F",
            "2021",
            "2223",
            "2425",
            "2627",
            "2829",
            "2A2B",
            "2C2D",
            "2E2F",
            "3031",
            "3233",
            "3435",
            "3637",
            "3839",
            "3A3B",
            "3C3D",
            "3E3F"
          ]
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 60 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F303132333435363738393A3B3C3D3E3F 01000000",
      "notes": "path_len=0x60: bits 6-7=01 (hash_size=2), bits 0-5=32. Path: 64 bytes = MAX_PATH_SIZE. Maximum valid for 2-byte hashes."
    },
    {
      "id": "hc-030",
      "description": "Maximum count for hash_size=3: 21 hops, 63 bytes",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 3,
          "hash_count": 21,
          "hashes": [
            "000102",
            "030405",
            "060708",
            "090A0B",
            "0C0D0E",
            "0F1011",
            "121314",
            "151617",
            "18191A",
            "1B1C1D",
            "1E1F20",
            "212223",
            "242526",
            "272829",
            "2A2B2C",
            "2D2E2F",
            "303132",
            "333435",
            "363738",
            "393A3B",
            "3C3D3E"
          ]
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 95 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F303132333435363738393A3B3C3D3E 01000000",
      "notes": "path_len=0x95: bits 6-7=10 (hash_size=3), bits 0-5=21. Path: 63 bytes. Maximum valid for 3-byte hashes (22*3=66 would overflow)."
    }
  ]
}