Initial commit

AUTHORS

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+Zered <zered@member.fsf.org>

COPYING

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+

README

@@ -0,0 +1,13 @@
+pybfenc 1.0 :
+=============
+
+pybfenc is a VERY USEFULL programm that allows you to convert data into
+brainfuck code. It try to reduce the brainfuck code size as possible.
+
+You can use it throught a pipe :
+cat /dev/urandom | ./pybfenc
+
+or with a file :
+
+./pybfenc foobar
+

pybfenc.py

@@ -0,0 +1,225 @@
+#!/usr/bin/python
+
+#
+#	Copyright 2014 Zered <zered@member.fsf.org>
+#
+#	bfstr is free software: you can redistribute it and/or modify
+#	it under the terms of the GNU General Public License as published by
+#	the Free Software Foundation, either version 3 of the License, or
+#(	at your option) any later version.
+#
+#	bfstr is distributed in the hope that it will be useful,
+#	but WITHOUT ANY WARRANTY; without even the implied warranty of
+#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#	GNU General Public License for more details.
+#
+#	You should have received a copy of the GNU General Public License
+#	along with bfstr.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+	Brainfuck encoder
+"""
+
+import sys
+from time import sleep
+
+
+PRIMES = [ 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251 ]
+
+OPTIPRIMEMAX = 21
+OPTIDELTAMIN = 26
+
+# Using the generator pattern (an iterable)
+class BrainfuckGenerator(object):
+	
+	def __init__(self,inStr=None):
+		self.prev = 0
+		self.end = False
+		
+		if inStr != None:
+			self.next(inStr)
+			end = True
+
+	def __iter__(self):
+		return self
+
+	# Python 3 compatibility
+	def __next__(self):
+		return self.next()
+
+	def next(self,inStr):
+		if self.end:
+			raise StopIteration()
+			
+		res=""
+		for c in inStr:
+			nc = ord(c)
+			plus = True
+			delta = nc-self.prev
+			
+			if delta < 0:
+				plus = False
+				delta*=-1
+				
+			"""
+			if delta > 1:
+				res+=nb2bf(delta,plus)
+			elif delta == 1:
+				if plus:
+					res+='+'
+				else:
+					res+='-'
+			"""
+			
+			if delta > OPTIDELTAMIN:
+				res+=nb2bf(delta,plus)
+			elif delta > 0:
+				if plus:
+					chrAdd='+'
+				else:
+					chrAdd='-'
+					
+				for _ in range(delta):
+					if plus:
+						res+=chrAdd
+					else:
+						res+=chrAdd
+			
+			
+			
+			res+='.'
+			self.prev = nc
+		
+		return res
+
+#Function defined only for non generator purpose
+def str2bf(inStr):
+	bg = bfGen()
+	return bg.next(inStr)
+
+#Return the brainfuck ops to add (or sub) delta to the current val
+def nb2bf(delta, plus):
+	
+	primes = primeFact(delta)
+	
+	#we will test if when adding or substracting 1 is not shorter
+	primesP1 = primeFact(delta+1)
+	primesM1 = primeFact(delta-1)
+	
+	"""
+	#print "delta",delta
+	primes = optiPrime(primeFact(delta))
+	#we will test if when adding or substracting 1 is not shorter
+	primesP1 = optiPrime(primeFact(delta+1))
+	primesM1 = optiPrime(primeFact(delta-1))
+	"""
+	
+	
+	p1 = False
+	m1 = False
+	
+	if sum(primes) > sum(primesP1):
+		primes = primesP1
+		p1=True
+	
+	if sum(primes) > sum(primesM1) and delta-1>1:
+		primes = primesM1
+		p1=False
+		m1=True
+	
+
+	res = ""
+	
+	mv=0
+	
+	if len(primes) > 1:
+		
+		for prime in primes:
+			
+			mv+=1
+			res+='>'
+			for _ in range(prime):
+				res+='+'
+			res+='['
+
+		for _ in range(mv):
+			res+='<'
+			
+		if plus:
+			res+='+'
+		else:
+			res+='-'
+			
+		for _ in range(mv):
+			res+='>'
+		res+='-]'
+		
+		for _ in range(mv-1):
+			res+='<-]'
+			
+		res+='<'
+	else:
+		for foo in range(primes[0]):
+			if plus:
+				res+='+'
+			else:
+				res+='-'
+	
+	#Correcting the optimisation add 1 or sub 1
+	if plus:
+		if p1:
+			res+='-'
+		elif m1:
+			res+='+'
+	else:
+		if p1:
+			res+='+'
+		elif m1:
+			res+='-'
+	
+	
+	return res
+		
+
+#Prime factor decomposition
+def primeFact(n):
+	
+	nc = n
+	
+	res = []
+	"""
+	for i in PRIMES:
+		if nc == 0:
+			return res
+		while nc%i == 0:
+			res.append(i)
+			nc/=i
+	"""
+	for i in PRIMES:
+		if nc == 0:
+			return res
+		while nc%i == 0:
+			
+			#optimization
+			if len(res) > 0 and res[-1] * i < OPTIPRIMEMAX:
+				res[-1]*=i
+			else:
+				res.append(i)
+				
+				
+			nc/=i
+			
+	return res
+
+def main():
+	if (len(sys.argv) == 2):	
+		print BrainfuckGenerator(sys.argv[1])
+	else:
+		bg = BrainfuckGenerator()
+		for line in sys.stdin:
+			sys.stdout.write(bg.next(line))
+			sys.stdout.flush()
+
+if __name__ == "__main__":
+	main()

test.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+bfenc="./pybfenc"
+
+data=$(tempfile)
+databf=$(tempfile)
+datares=$(tempfile)
+
+dd if=/dev/urandom of=$data bs=1024 count=8 > /dev/null
+
+cat $data | $bfenc > $databf
+beef $databf > $datares
+
+[ "$(md5sum $data |cut -d " " -f1)" = "$(md5sum $datares |cut -d " " -f1)" ] && echo "OK" || echo "Fail"
+
+rm $data $databf $datares