char[] buf = new char[DEFAULT_BUF_SIZE];
    int nRead;
    long total = 0;
    while ((nRead = from.read(buf)) != -1) {
      to.write(buf, 0, nRead);
      total += nRead;
    }
    return total;
  }

  /**
   * Reads all characters from a {@link Readable} object into a {@link String}. Does not close the
   * {@code Readable}.
   *
   * @param r the object to read from

          try (InputStreamReader reader = new InputStreamReader(byteSource.openStream(), cs)) {
            int nRead = 0;
            while (remaining > 0 && (nRead = reader.read(buffer, bufIndex, remaining)) != -1) {
              bufIndex += nRead;
              remaining -= nRead;
            }
            if (nRead == -1) {
              // we reached EOF
              return new String(buffer, 0, bufIndex);
            }

pkg syscall (darwin-arm64), const CFLUSH ideal-int
pkg syscall (darwin-arm64), const CLOCAL = 32768
pkg syscall (darwin-arm64), const CLOCAL ideal-int
pkg syscall (darwin-arm64), const CREAD = 2048
pkg syscall (darwin-arm64), const CREAD ideal-int
pkg syscall (darwin-arm64), const CS5 = 0
pkg syscall (darwin-arm64), const CS5 ideal-int
pkg syscall (darwin-arm64), const CS6 = 256
pkg syscall (darwin-arm64), const CS6 ideal-int

pkg syscall (freebsd-arm64), const CFLUSH ideal-int
pkg syscall (freebsd-arm64), const CLOCAL = 32768
pkg syscall (freebsd-arm64), const CLOCAL ideal-int
pkg syscall (freebsd-arm64), const CREAD = 2048
pkg syscall (freebsd-arm64), const CREAD ideal-int
pkg syscall (freebsd-arm64), const CS5 = 0
pkg syscall (freebsd-arm64), const CS5 ideal-int
pkg syscall (freebsd-arm64), const CS6 = 256
pkg syscall (freebsd-arm64), const CS6 ideal-int

pkg syscall (freebsd-riscv64), const CLOCAL = 32768 #53466
pkg syscall (freebsd-riscv64), const CLOCAL ideal-int #53466
pkg syscall (freebsd-riscv64), const CREAD = 2048 #53466
pkg syscall (freebsd-riscv64), const CREAD ideal-int #53466
pkg syscall (freebsd-riscv64), const CS5 = 0 #53466
pkg syscall (freebsd-riscv64), const CS5 ideal-int #53466
pkg syscall (freebsd-riscv64), const CS6 = 256 #53466

}

func (r *checksumReader) Read(b []byte) (n int, err error) {
	if r.err != nil {
		return 0, r.err
	}
	n, err = r.rc.Read(b)
	r.hash.Write(b[:n])
	r.nread += uint64(n)
	if r.nread > r.f.UncompressedSize64 {
		return 0, ErrFormat
	}
	if err == nil {
		return
	}
	if err == io.EOF {
		if r.nread != r.f.UncompressedSize64 {
			return 0, io.ErrUnexpectedEOF
		}

	buf := make([]byte, 1)
	if _, err := b.Read(nil); err != nil {
		t.Fatalf("1st nil Read = %v; want nil", err)
	}
	if _, err := b.Read(buf); err != errFake {
		t.Fatalf("1st Read = %v; want errFake", err)
	}
	if _, err := b.Read(nil); err != nil {
		t.Fatalf("2nd nil Read = %v; want nil", err)
	}
	if _, err := b.Read(buf); err != nil {
		t.Fatalf("3rd Read with buffer = %v; want nil", err)
	}

		t.Errorf("Read error: got %T, want testError1", err)
	}
	if _, err := rb.TryRead([]byte{0}); err != (testError1{}) {
		t.Errorf("Read error: got %T, want testError1", err)
	}
	rb.CloseWithError(testError2{})
	if _, err := rb.Read(nil); err != (testError1{}) {
		t.Errorf("Read error: got %T, want testError1", err)
	}
	if _, err := rb.Read([]byte{0}); err != (testError1{}) {

    val buffer = Buffer()
    operator.read(6, buffer, 21)
    operator.read(36, buffer, 1)
    operator.read(5, buffer, 5)
    operator.read(28, buffer, 8)
    operator.read(17, buffer, 10)
    operator.read(36, buffer, 2)
    operator.read(2, buffer, 4)
    operator.write(0, buffer, buffer.size)
    operator.read(0, buffer, 12)
    operator.read(47, buffer, 3)
    operator.read(45, buffer, 2)
    operator.read(47, buffer, 3)

    assertEquals(0, ticker.read());
    assertEquals(10, ticker.read());
    assertEquals(20, ticker.read());
  }

  public void testAutoIncrementStep_millis() {
    FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, MILLISECONDS);
    assertEquals(0, ticker.read());
    assertEquals(1000000, ticker.read());
    assertEquals(2000000, ticker.read());
  }