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# -*- coding: utf-8 -*-
#
# pyhwp : hwp file format parser in python
# Copyright (C) 2010-2023 mete0r <https://github.com/mete0r>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals
import codecs
import zlib # this codec needs the optional zlib module !
_wbits = -15
def zlib_raw_encode(input, errors='strict'):
assert errors == 'strict'
output = zlib.compress(input)[2:-4]
return (output, len(input))
def zlib_raw_decode(input, errors='strict'):
assert errors == 'strict'
output = zlib.decompress(input, _wbits)
return (output, len(input))
class Codec(codecs.Codec):
def encode(self, input, errors='strict'):
return zlib_raw_encode(input, errors)
def decode(self, input, errors='strict'):
return zlib_raw_decode(input, errors)
class IncrementalEncoder(codecs.IncrementalEncoder):
def __init__(self, errors='strict'):
assert errors == 'strict'
self.errors = errors
self.compressobj = zlib.compressobj()
self.initial = True
def encode(self, input, final=False):
c = self.compressobj.compress(input)
if self.initial:
c = c[2:]
self.initial = False
if final:
c += self.compressobj.flush()[:-4]
return c
def reset(self):
self.compressobj = zlib.compressobj()
class IncrementalDecoder(codecs.IncrementalDecoder):
def __init__(self, errors='strict'):
assert errors == 'strict'
self.errors = errors
self.decompressobj = zlib.decompressobj(_wbits)
def decode(self, input, final=False):
if final:
if len(input) > 0:
d = self.decompressobj.decompress(input)
else:
d = b''
return d + self.decompressobj.flush()
else:
return self.decompressobj.decompress(input)
def reset(self):
self.decompressobj = zlib.decompressobj(_wbits)
class StreamWriter(object):
def __init__(self, stream, errors='strict'):
assert errors == 'strict'
self.stream = stream
self.encoder = IncrementalEncoder(errors)
def write(self, data):
raise NotImplementedError
class StreamReader(object):
def __init__(self, stream, errors='strict'):
assert errors == 'strict'
self.stream = stream
self.decoder = IncrementalDecoder(errors)
self.buffer = b''
self.offset = 0
def read(self, size=-1):
if size < 0:
c = self.stream.read()
d = self.buffer + self.decoder.decode(c, True)
self.buffer = b''
self.offset += len(d)
return d
final = False
while True:
if size <= len(self.buffer):
d = self.buffer[:size]
self.buffer = self.buffer[size:]
self.offset += size
return d
if final:
d = self.buffer
self.buffer = b''
self.offset += len(d)
return d
c = self.stream.read(8196)
final = len(c) < 8196 or len(c)
self.buffer += self.decoder.decode(c, final)
def tell(self):
return self.offset
_codecinfo = codecs.CodecInfo(
name='zlib_raw',
encode=zlib_raw_encode,
decode=zlib_raw_decode,
incrementalencoder=IncrementalEncoder,
incrementaldecoder=IncrementalDecoder,
streamreader=StreamReader,
streamwriter=StreamWriter,
)
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