// Start with files from GOROOT, filtering out non-distribution files.
	base, err := NewArchive(goroot)
	if err != nil {
		log.Fatal(err)
	}
	base.SetTime(versionTime)
	base.SetMode(mode)
	base.Remove(
		".git/**",
		".gitattributes",
		".github/**",
		".gitignore",
		"VERSION.cache",
		"misc/cgo/*/_obj/**",
		"**/.DS_Store",
		"**/*.exe~", // go.dev/issue/23894

	if mode == ToNearestAway {
		panic("not yet implemented")
	}
	if mode == ToNearestEven && rbit == 1 && (sbit == 1 || sbit == 0 && bit0 != 0) || mode == AwayFromZero {
		// round away from zero
		f.SetMode(ToZero).SetPrec(prec)
		f.Add(f, Bits{int(r) + 1}.Float())
	}
	return f
}

// Float returns the *Float z of the smallest possible precision such that

        }

        final ExtractData data = new ExtractData();
        final HttpPost httpPost = new HttpPost(url);
        final HttpEntity postEntity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
                .setCharset(Charset.forName("UTF-8")).addBinaryBody("filedata", in).build();
        httpPost.setEntity(postEntity);

        if (isWindows()) {
            return
        }
        def perms = PosixFilePermissions.fromString(permissions)
        Files.setPosixFilePermissions(file.toPath(), perms)
    }

    void setMode(int mode) {
        // TODO: Remove this entirely and use built-in Files.setPosixFilePermissions
        def process = ["chmod", Integer.toOctalString(mode), file.absolutePath].execute()

        return this;
    }

    public TestFile setMode(int mode) {
        assertExists();
        new TestFileHelper(this).setMode(mode);
        return this;
    }

    public int getMode() {
        assertExists();
        return new TestFileHelper(this).getMode();
    }

    /**

// ParseFloat is like f.Parse(s, base) with f set to the given precision
// and rounding mode.
func ParseFloat(s string, base int, prec uint, mode RoundingMode) (f *Float, b int, err error) {
	return new(Float).SetPrec(prec).SetMode(mode).Parse(s, base)
}

var _ fmt.Scanner = (*Float)(nil) // *Float must implement fmt.Scanner

// Scan is a support routine for [fmt.Scanner]; it sets z to the value of

        TarArchiveEntry entry = new TarArchiveEntry(path, true);
        entry.setSize(size);
        entry.setMode(mode);
        tarOutput.putArchiveEntry(entry);
    }

    @Override
    public UnpackResult unpack(CacheableEntity entity, InputStream input, OriginReader readOrigin) throws IOException {

	// round mantissa to n bits
	var n uint
	if prec < 0 {
		n = 1 + (x.MinPrec()-1+3)/4*4 // round MinPrec up to 1 mod 4
	} else {
		n = 1 + 4*uint(prec)
	}
	// n%4 == 1
	x = new(Float).SetPrec(n).SetMode(x.mode).Set(x)

	// adjust mantissa to use exactly n bits
	m := x.mant
	switch w := uint(len(x.mant)) * _W; {
	case w < n:
		m = nat(nil).shl(m, n-w)
	case w > n:
		m = nat(nil).shr(m, w-n)
	}

}

func makeAcc(above bool) Accuracy {
	if above {
		return Above
	}
	return Below
}

// SetMode sets z's rounding mode to mode and returns an exact z.
// z remains unchanged otherwise.
// z.SetMode(z.Mode()) is a cheap way to set z's accuracy to [Exact].
func (z *Float) SetMode(mode RoundingMode) *Float {
	z.mode = mode
	z.acc = Exact
	return z
}

			var t big.Float
			t.SetPrec(prec - delta)

			// try rounding down a little
			t.SetMode(big.ToZero)
			t.Set(x.val)
			if _, acc := t.Int(i); acc == big.Exact {
				return makeInt(i)
			}

			// try rounding up a little
			t.SetMode(big.AwayFromZero)
			t.Set(x.val)
			if _, acc := t.Int(i); acc == big.Exact {
				return makeInt(i)
			}
		}