import javabridge as jv
import bioformats as bf

def start(max_heap_size='8G'):
    """Start the Java Virtual Machine, enabling bioformats IO.

    Parameters
    ----------
    max_heap_size : string, optional
        The maximum memory usage by the virtual machine. Valid strings
        include '256M', '64k', and '2G'. Expect to need a lot.
    """
    jv.start_vm(class_path=bf.JARS, max_heap_size=max_heap_size)

def done():
    """Kill the JVM. Once killed, it cannot be restarted.

    Notes
    -----
    See the python-javabridge documentation for more information.
    """
    jv.kill_vm()

import numpy as np
import javabridge as jv
import bioformats as bf

def start(max_heap_size='8G'):
    """Start the Java Virtual Machine, enabling bioformats IO.

    Parameters
    ----------
    max_heap_size : string, optional
        The maximum memory usage by the virtual machine. Valid strings
        include '256M', '64k', and '2G'. Expect to need a lot.
    """
    jv.start_vm(class_path=bf.JARS, max_heap_size=max_heap_size)

def done():
    """Kill the JVM. Once killed, it cannot be restarted.

    Notes
    -----
    See the python-javabridge documentation for more information.
    """
    jv.kill_vm()


def lif_metadata_string_size(filename):
    """Get the length in bytes of the metadata string of a LIF file.

    Parameters
    ----------
    filename : string
        Path to the LIF file.

    Returns
    -------
    length : int
        The length in bytes of the metadata string.

    Notes
    -----
    This is based on code by Lee Kamentsky. [1]

    References
    ----------
    [1] https://github.com/CellProfiler/python-bioformats/issues/8
    """
    with open(filename, 'rb') as fd:
        fd.read(9)
        length = np.frombuffer(fd.read(4), "<i4")[0]
        return length

Add function to determine metadata length
Add function to determine metadata length

+ import numpy as np
  import javabridge as jv
  import bioformats as bf
  
  def start(max_heap_size='8G'):
      """Start the Java Virtual Machine, enabling bioformats IO.
  
      Parameters
      ----------
      max_heap_size : string, optional
          The maximum memory usage by the virtual machine. Valid strings
          include '256M', '64k', and '2G'. Expect to need a lot.
      """
      jv.start_vm(class_path=bf.JARS, max_heap_size=max_heap_size)
  
  def done():
      """Kill the JVM. Once killed, it cannot be restarted.
  
      Notes
      -----
      See the python-javabridge documentation for more information.
      """
      jv.kill_vm()
  
+ 
+ def lif_metadata_string_size(filename):
+     """Get the length in bytes of the metadata string of a LIF file.
+ 
+     Parameters
+     ----------
+     filename : string
+         Path to the LIF file.
+ 
+     Returns
+     -------
+     length : int
+         The length in bytes of the metadata string.
+ 
+     Notes
+     -----
+     This is based on code by Lee Kamentsky. [1]
+ 
+     References
+     ----------
+     [1] https://github.com/CellProfiler/python-bioformats/issues/8
+     """
+     with open(filename, 'rb') as fd:
+         fd.read(9)
+         length = np.frombuffer(fd.read(4), "<i4")[0]
+         return length
+ 
Add function to determine metadata length
## Code Before:
import javabridge as jv
import bioformats as bf

def start(max_heap_size='8G'):
    """Start the Java Virtual Machine, enabling bioformats IO.

    Parameters
    ----------
    max_heap_size : string, optional
        The maximum memory usage by the virtual machine. Valid strings
        include '256M', '64k', and '2G'. Expect to need a lot.
    """
    jv.start_vm(class_path=bf.JARS, max_heap_size=max_heap_size)

def done():
    """Kill the JVM. Once killed, it cannot be restarted.

    Notes
    -----
    See the python-javabridge documentation for more information.
    """
    jv.kill_vm()

## Instruction:
Add function to determine metadata length
## Code After:
import numpy as np
import javabridge as jv
import bioformats as bf

def start(max_heap_size='8G'):
    """Start the Java Virtual Machine, enabling bioformats IO.

    Parameters
    ----------
    max_heap_size : string, optional
        The maximum memory usage by the virtual machine. Valid strings
        include '256M', '64k', and '2G'. Expect to need a lot.
    """
    jv.start_vm(class_path=bf.JARS, max_heap_size=max_heap_size)

def done():
    """Kill the JVM. Once killed, it cannot be restarted.

    Notes
    -----
    See the python-javabridge documentation for more information.
    """
    jv.kill_vm()


def lif_metadata_string_size(filename):
    """Get the length in bytes of the metadata string of a LIF file.

    Parameters
    ----------
    filename : string
        Path to the LIF file.

    Returns
    -------
    length : int
        The length in bytes of the metadata string.

    Notes
    -----
    This is based on code by Lee Kamentsky. [1]

    References
    ----------
    [1] https://github.com/CellProfiler/python-bioformats/issues/8
    """
    with open(filename, 'rb') as fd:
        fd.read(9)
        length = np.frombuffer(fd.read(4), "<i4")[0]
        return length
