Simple FastDL script written using Python 2.7.3 with the bz2 library.

srcds_fastdl.bat

start srcds_fastdl.py "/source" "/target"

srcds_fastdl.py

import os, sys, getopt, bz2

_debug = 0	# Use -d switch to enable

source = None
target = None

# Directories to ignore searching in
ignoredir = [ '.svn', '.git' ]

# Valid file extensions to compress
validext = [
	'bsp',			# maps
	'mdl','vtx','vvd',	# models
	'vtf','vmt','png',	# textures
	'wav','mp3',		# sounds
	'pcf',			# particles
	'ttf','otf',		# fonts
	'txt'			# misc
]

def main(argv):
	try:
		opts, args = getopt.getopt(argv, "h:d", ["help"])
	except getopt.GetoptError:
		usage()
		sys.exit()

	for opt, arg in opts:
		if opt in ("-h", "--help"):
			usage()
			sys.exit()
		elif opt == '-d':
			global _debug
			_debug = 1

	# Validate number of arguments
	if len(args) < 2:
		print "Invalid arguments"
		usage()
		sys.exit()
 
	# Get arguments
	global source, target
	source = args[0]
	target = args[1]

	# Validate path directories
	if not os.path.isdir(source):
		print "Source path doesn't exist!"
		sys.exit()
	elif not os.path.isdir(target):
		print "Target path doesn't exist!"
		sys.exit()

	# Begin compressing files
	bzip2dir()

def usage():
	print "Usage: <source> <target>"

def bzip2dir():
	global source, target, ignoredir
	sourcelen = len(source)

	# Walk source path
	for roots, dirlist, filelist in os.walk(source):
		# Ignore version control directories
		for v in ignoredir:
			if v in roots:
				continue

		for filename in [os.path.join(roots,filegot) for filegot in filelist]:
			bzip2file( filename[sourcelen:] )

def bzip2file(filename):
	global source, target, _debug
	
	# Make sure file is of valid type before continuing
	if not validfile(filename):
		if _debug:
			print "skip: %s" % filename
		return

	# Open input file
	fin = open(source + filename, 'rb')

	# Get output path
	dest = target + filename + '.bz2'

	# Ignore writing to file if it already exists
	if os.path.exists(dest):
		if _debug:
			print "exists: %s" % dest
		return

	# Get absolute output folder
	directory = os.path.dirname(os.path.abspath(dest))

	# Create folder if it doesn't exist
	if not os.path.exists(directory):
		if _debug:
			print "makedir: %s" % directory
		os.makedirs(directory)

	# Create new file and write bz2 compressed data
	fout = bz2.BZ2File(dest, 'w')
	fout.write(fin.read())

	# Close files
	fout.close()
	fin.close()

	if _debug:
		print "compress: %s" % dest


def validfile(filename):
	global validext

	# Separate name and extension
	name, ext = os.path.splitext(filename)
	ext = ext[1:] # remove period

	# Check for extension in valid extensions list
	return ext in validext

if __name__ == "__main__":
	main(sys.argv[1:])