# Some code has been reused and modified from the original by Mathieu Fenniak:
# Parameters management in Flate and LZW algorithms, asciiHexDecode and ascii85Decode
#
# Copyright (c) 2006, Mathieu Fenniak
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

#
#	peepdf is a tool to analyse and modify PDF files
#	http://peepdf.eternal-todo.com
#	By Jose Miguel Esparza <jesparza AT eternal-todo.com>
#
#	Copyright (C) 2011 Jose Miguel Esparza
#
#	This file is part of peepdf.
#
#		peepdf 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.
#
#		peepdf 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 peepdf.	If not, see <http://www.gnu.org/licenses/>.
#

'''
	Module to manage encoding/decoding in PDF files
'''

import sys, zlib, lzw, struct
from PDFUtils import getNumsFromBytes, getBytesFromBits, getBitsFromNum
from ccitt import CCITTFax

def decodeStream(stream, filter, parameters = {}):
	'''
		Decode the given stream