#!/usr/bin/python
#########################################################
# split a file into a set of portions; join.py puts them
# back together; this is a customizable version of the
# standard unix split command-line utility; because it
# is written in Python, it also works on Windows and can
# be easily tweaked; because it exports a function, it
# can also be imported and reused in other applications;
#########################################################
import sys, os
kilobytes = 1024
megabytes = kilobytes * 1000
chunksize = int(1.4 * megabytes) # default: roughly a floppy
def split(fromfile, todir, chunksize=chunksize):
if not os.path.exists(todir): # caller handles errors
os.mkdir(todir) # make dir, read/write parts
else:
for fname in os.listdir(todir): # delete any existing files
os.remove(os.path.join(todir, fname))
partnum = 0
input = open(fromfile, 'rb') # use binary mode on Windows
while 1: # eof=empty string from read
chunk = input.read(chunksize) # get next part <= chunksize
if not chunk: break
partnum = partnum+1
filename = os.path.join(todir, ('part%04d' % partnum))
fileobj = open(filename, 'wb')
fileobj.write(chunk)
fileobj.close() # or simply open( ).write( )
input.close( )
assert partnum <= 9999 # join sort fails if 5 digits
return partnum
if __name__ == '__main__':
if len(sys.argv) == 2 and sys.argv[1] == '-help':
print 'Use: split.py [file-to-split target-dir [chunksize]]'
else:
if len(sys.argv) < 3:
interactive = 1
fromfile = raw_input('File to be split? ') # input if clicked
todir = raw_input('Directory to store part files? ')
else:
interactive = 0
fromfile, todir = sys.argv[1:3] # args in cmdline
if len(sys.argv) == 4: chunksize = int(sys.argv[3])
absfrom, absto = map(os.path.abspath, [fromfile, todir])
print 'Splitting', absfrom, 'to', absto, 'by', chunksize
try:
parts = split(fromfile, todir, chunksize)
except:
print 'Error during split:'
print sys.exc_type, sys.exc_value
else:
print 'Split finished:', parts, 'parts are in', absto
if interactive: raw_input('Press Enter key') # pause if clicked
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