if (!condition) {
      throw new ArithmeticException("overflow: " + methodName + "(" + a + ", " + b + ")");
    }
  }

  static void checkNoOverflow(boolean condition, String methodName, long a, long b) {
    if (!condition) {
      throw new ArithmeticException("overflow: " + methodName + "(" + a + ", " + b + ")");
    }
  }

  private MathPreconditions() {}

  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~
  public void testConcat_overflow_negative() {
    int dim1 = 1 << 16;
    int dim2 = 1 << 15;
    assertThat(dim1 * dim2).isLessThan(0);
    testConcat_overflow(dim1, dim2);
  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~

  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~
  public void testConcat_overflow_negative() {
    int dim1 = 1 << 16;
    int dim2 = 1 << 15;
    assertThat(dim1 * dim2).isLessThan(0);
    testConcat_overflow(dim1, dim2);
  }

  @GwtIncompatible // different overflow behavior; could probably be made to work by using ~~

      assertThat(UnsignedInts.parseUnsignedInt(maxAsString, radix)).isEqualTo(-1);

      try {
        // tests that we get exception where an overflow would occur.
        long overflow = 1L << 32;
        String overflowAsString = Long.toString(overflow, radix);
        UnsignedInts.parseUnsignedInt(overflowAsString, radix);
        fail();
      } catch (NumberFormatException expected) {
      }
    }
  }

      assertThat(UnsignedLongs.parseUnsignedLong(maxAsString, radix)).isEqualTo(max.longValue());

      try {
        // tests that we get exception where an overflow would occur.
        BigInteger overflow = max.add(ONE);
        String overflowAsString = overflow.toString(radix);
        UnsignedLongs.parseUnsignedLong(overflowAsString, radix);
        fail();
      } catch (NumberFormatException expected) {
      }
    }

      element = null;
      extras = emptyList();
    }

    IllegalArgumentException multiples(boolean overflow) {
      StringBuilder sb =
          new StringBuilder().append("expected one element but was: <").append(element);
      for (Object o : extras) {
        sb.append(", ").append(o);
      }
      if (overflow) {
        sb.append(", ...");
      }
      sb.append('>');

      assertThat(UnsignedLongs.parseUnsignedLong(maxAsString, radix)).isEqualTo(max.longValue());

      try {
        // tests that we get exception where an overflow would occur.
        BigInteger overflow = max.add(ONE);
        String overflowAsString = overflow.toString(radix);
        UnsignedLongs.parseUnsignedLong(overflowAsString, radix);
        fail();
      } catch (NumberFormatException expected) {
      }
    }

    static {
      BigInteger overflow = new BigInteger("10000000000000000", 16);
      for (int i = Character.MIN_RADIX; i <= Character.MAX_RADIX; i++) {
        maxValueDivs[i] = divide(MAX_VALUE, i);
        maxValueMods[i] = (int) remainder(MAX_VALUE, i);
        maxSafeDigits[i] = overflow.toString(i).length() - 1;
      }
    }

    /**

      assertThat(UnsignedInts.parseUnsignedInt(maxAsString, radix)).isEqualTo(-1);

      try {
        // tests that we get exception where an overflow would occur.
        long overflow = 1L << 32;
        String overflowAsString = Long.toString(overflow, radix);
        UnsignedInts.parseUnsignedInt(overflowAsString, radix);
        fail();
      } catch (NumberFormatException expected) {
      }
    }
  }

	if objectSize > maxMultipartPutObjectSize {
		err = errors.New("entity too large")
		return
	}

	configuredPartSize := minPartSize
	// Use floats for part size for all calculations to avoid
	// overflows during float64 to int64 conversions.
	partSizeFlt := float64(objectSize / maxPartsCount)
	partSizeFlt = math.Ceil(partSizeFlt/float64(configuredPartSize)) * float64(configuredPartSize)

	// Part size.