Fractionfiles.py

// Splits a file into smaller ones, and joins them together.


#!/usr/bin/env python

"""Splits and joins files. Helpful when media can't fit a file.
Be prepared for a lot of output files!"""

__author__="Andrew Pennebaker (andrew.pennebaker@gmail.com)"
__date__="6 Jan 3006 - 12 Feb 2006"
__copyright__="Copyright 2006 Andrew Pennebaker"
__version__="0.3"
__URL__="http://snippets.dzone.com/posts/show/3541"

import sys, os
from getopt import getopt

SPLIT_MODE="SPLIT"
JOIN_MODE="JOIN"

def splitFile(name, length, number):
	if length==None:
		infile=open(name, "rb")
		size=0
		while infile.read(1)!="":
			size+=1

		infile.close()

		maxlength=size/number
		if number*maxlength"
	print "--join "
	print "--maxlength "
	print "--maxfiles "
	print "--help (usage)"

	sys.exit()

def main():
	global SPLIT_MODE
	global JOIN_MODE

	mode=SPLIT_MODE
	filenames=[]
	maxlength=1024
	maxfiles=None

	systemArgs=sys.argv[1:] # ignore program name

	optlist=[]
	args=[]

	try:
		optlist, args=getopt(systemArgs, None, ["split", "join", "maxlength=", "maxfiles=", "help"])
	except Exception, e:
		usage()

	if len(optlist)<1 or len(args)<1:
		usage()

	for option, value in optlist:
		if option=="--help":
			usage()

		elif option=="--split":
			mode=SPLIT_MODE
		elif option=="--join":
			mode=JOIN_MODE
		elif option=="--maxlength":
			try:
				maxlength=int(value)
				if maxlength<1:
					raise Exception
				maxfiles=None
			except Exception, e:
				raise "Length must be at least one"
		elif option=="--maxfiles":
			try:
				maxfiles=int(value)
				if maxfiles<1:
					raise Exception
				maxlength=None
			except Exception, e:
				raise "Number must be at least one"

	filenames=args

	if mode==SPLIT_MODE:
		for filename in filenames:
			try:
				splitFile(filename, maxlength, maxfiles)
			except Exception, e:
				raise e

	elif mode==JOIN_MODE:
		for directory in filenames:
			files=["%s%s%s" % (directory, os.sep, file) for file in os.listdir(directory)]

			try:
				joinFiles(files)
			except Exception, e:
				raise e

if __name__=="__main__":
	main()