#!/usr/bin/python

bath_in = open("gebco_bathy.21601x10801.bin","r")
bath_out = open("gebco_bathy.21601x10801x8.bin","w")

import array,time,os

t = time.time()

while 1:
    data = bath_in.read(10240)
    if not data:
        break

    a = array.array("H")
    
    a.fromstring(data)
    
    l = array.array("c")
    
    for d in a:
        nd = chr(d>>8)
        l.append(nd)
        
    bath_out.write(l.tostring())
    bath_out.flush()
        
    nt = time.time()
    if t + 1 < nt:
        t = nt
        print len(data), len(data), len(l.tostring()), float(bath_in.tell()) / float(os.fstat(bath_in.fileno())[6])