return cmp.Compare(rb.off+rb.n, off)
	})
	parts := r.buf[skipParts:]
	if len(parts) > 0 {
		skipBytes := off - parts[0].off
		for _, part := range parts {
			repeat := int(min(part.n-skipBytes, int64(len(p)-n)))
			memset(p[n:n+repeat], part.b)
			n += repeat
			if n == len(p) {
				return
			}
			skipBytes = 0
		}
	}
	if n != len(p) {
		err = io.ErrUnexpectedEOF
	}
	return
}

	return b
}

// Despite being an exported symbol,
// Repeat is linknamed by widely used packages.
// Notable members of the hall of shame include:
//   - gitee.com/quant1x/num
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
// Note that this comment is not part of the doc comment.
//
//go:linkname Repeat

// Repeat returns a new byte slice consisting of count copies of b.
//

   * example, {@code repeat("hey", 3)} returns the string {@code "heyheyhey"}.
   *
   * <p><b>Java 11+ users:</b> use {@code string.repeat(count)} instead.
   *
   * @param string any non-null string
   * @param count the number of times to repeat it; a nonnegative integer
   * @return a string containing {@code string} repeated {@code count} times (the empty string if
   *     {@code count} is zero)

						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),
						int64(1e10 - blockSize),
						strings.Repeat("\x00", blockSize-100) + strings.Repeat("0123456789", 10),

		f.err = ErrFieldTooLong
	}

	s := strconv.FormatInt(x, 8)
	// Add leading zeros, but leave room for a NUL.
	if n := len(b) - len(s) - 1; n > 0 {
		s = strings.Repeat("0", n) + s
	}
	f.formatString(b, s)
}

// fitsInOctal reports whether the integer x fits in a field n-bytes long
// using octal encoding with the appropriate NUL terminator.
func fitsInOctal(n int, x int64) bool {
	octBits := uint(n-1) * 3

    }

    @Test
    @DisplayName("Test username length validation")
    void testUsernameLengthValidation() {
        String longUsername = "a".repeat(InputValidator.MAX_USERNAME_LENGTH + 1);
        assertThrows(IllegalArgumentException.class, () -> InputValidator.validateUsername(longUsername));
    }

    @ParameterizedTest
    @DisplayName("Test valid domains")

   * example, {@code repeat("hey", 3)} returns the string {@code "heyheyhey"}.
   *
   * @param string any non-null string
   * @param count the number of times to repeat it; a nonnegative integer
   * @return a string containing {@code string} repeated {@code count} times (the empty string if
   *     {@code count} is zero)

        assertEquals("", blob.toString(), "toString() should be empty for empty buffer");
    }

    // Ensures set(null) resets the buffer to empty and does not NPE
    @Test
    @DisplayName("set(null) resets to empty")
    void set_null_resetsToEmpty() {
        // Arrange
        SecurityBlob blob = new SecurityBlob(new byte[] { 1, 2, 3 });

        // Act
        blob.set(null);

		inputHdrs: map[string]string{paxGNUSparseMajor: "1", paxGNUSparseMinor: "0"},
		wantErr:   ErrHeader,
	}, {
		inputData: padInput(strings.Repeat("0", 300) + "1\n" + strings.Repeat("0", 1000) + "5\n" + strings.Repeat("0", 800) + "2\n"),
		inputHdrs: map[string]string{paxGNUSparseMajor: "1", paxGNUSparseMinor: "0"},
		wantMap:   sparseDatas{{5, 2}},
	}, {
		inputData: padInput("2\n10737418240\n512\n21474836480\n512\n"),

func BenchmarkRingBuffer_Sync(b *testing.B) {
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	for b.Loop() {
		rb.Write(data)
		rb.Read(buf)
	}
}

func BenchmarkRingBuffer_AsyncRead(b *testing.B) {
	// Pretty useless benchmark, but it's here for completeness.
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	go func() {
		for {
			rb.Read(buf)