const (
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good
// chance the file doesn't exist yet.
var (
	randN  uint32
	randmu sync.Mutex

github.com/hashicorp/go-hclog v1.1.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ=
github.com/hashicorp/go-hclog v1.6.3 h1:Qr2kF+eVWjTiYmU7Y31tYlP1h0q/X3Nl3tPGdaB11/k=
github.com/hashicorp/go-hclog v1.6.3/go.mod h1:W4Qnvbt70Wk/zYJryRzDRU/4r0kIg0PVHBcfoyhpF5M=
github.com/hashicorp/go-immutable-radix v1.0.0/go.mod h1:0y9vanUI8NX6FsYoO3zeMjhV/C5i9g4Q3DwcSNZ4P60=

		{"dash-.may-not-appear-next-to-dot", false},
		{"dash.-may-not-appear-next-to-dot", false},
		{"dash-.-may-not-appear-next-to-dot", false},
		{"lalalallalallalalalallalallalala-thestring-size-is-greater-than-63", false},
	}

	for i, testCase := range testCases {
		isValidBucketName := IsValidBucketName(testCase.bucketName)
		if testCase.shouldPass && !isValidBucketName {

            throw new IOException("Connection lost and reconnection failed", e);
        }
    } else {
        throw e;  // No durable handle, propagate error
    }
}
```

### 6.3 Session Integration
```java
// In SmbSession.java
private PersistentHandleManager handleManager;

public SmbSession(CIFSContext context, SmbTransport transport) {
    // ... existing initialization ...
    

  /**
   * Maximum size of a single part of a domain name. See <a
   * href="http://www.ietf.org/rfc/rfc2181.txt">RFC 2181</a> part 11.
   */
  private static final int MAX_DOMAIN_PART_LENGTH = 63;

  /** The full domain name, converted to lower case. */
  private final String name;

  /** The parts of the domain name, converted to lower case. */
  private final ImmutableList<String> parts;

  /**

              }
            ]
          }
        ]
      },
      "gridPos": {
        "h": 6,
        "w": 6,
        "x": 0,
        "y": 12
      },
      "id": 63,
      "options": {
        "legend": {
          "calcs": [],
          "displayMode": "list",
          "placement": "bottom",
          "showLegend": true
        },
        "tooltip": {

                }
              }
            ]
          }
        ]
      },
      "gridPos": {
        "h": 6,
        "w": 6,
        "x": 12,
        "y": 6
      },
      "id": 63,
      "options": {
        "legend": {
          "calcs": [],
          "displayMode": "list",
          "placement": "bottom",
          "showLegend": true
        },
        "tooltip": {

pkg crypto/x509/pkix, type AttributeTypeAndValueSET struct, Type asn1.ObjectIdentifier
pkg crypto/x509/pkix, type AttributeTypeAndValueSET struct, Value [][]AttributeTypeAndValue
pkg debug/dwarf, const TagCondition = 63
pkg debug/dwarf, const TagCondition Tag
pkg debug/dwarf, const TagRvalueReferenceType = 66
pkg debug/dwarf, const TagRvalueReferenceType Tag
pkg debug/dwarf, const TagSharedType = 64
pkg debug/dwarf, const TagSharedType Tag

          "unit": "binBps"
        },
        "overrides": []
      },
      "gridPos": {
        "h": 6,
        "w": 7,
        "x": 9,
        "y": 6
      },
      "id": 63,
      "options": {
        "legend": {
          "calcs": [],
          "displayMode": "hidden",
          "placement": "right",
          "showLegend": false
        },
        "tooltip": {

			testWrite{"a", 0, ErrWriteTooLong},
			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{5, "abcde"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testWrite{"ab", 2, nil},
			testRemaining{6, 3},
			testReadFrom{fileOps{int64(3), "cde"}, 6, nil},
			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{5, "abcde"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{