mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-22 15:54:26 +00:00
122 lines
3.8 KiB
Python
122 lines
3.8 KiB
Python
#!/usr/bin/python -u
|
|
#
|
|
# p7zr library
|
|
#
|
|
# Copyright (c) 2019 Hiroshi Miura <miurahr@linux.com>
|
|
# Copyright (c) 2004-2015 by Joachim Bauch, mail@joachim-bauch.de
|
|
# 7-Zip Copyright (C) 1999-2010 Igor Pavlov
|
|
# LZMA SDK Copyright (C) 1999-2010 Igor Pavlov
|
|
#
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# This library 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
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
#
|
|
import lzma
|
|
import zlib
|
|
from abc import ABC, abstractmethod
|
|
from typing import Any, Dict, List, Union
|
|
|
|
from py7zr import UnsupportedCompressionMethodError
|
|
from py7zr.helpers import Buffer, calculate_key
|
|
from py7zr.properties import READ_BLOCKSIZE, CompressionMethod
|
|
|
|
try:
|
|
import zstandard as Zstd # type: ignore
|
|
except ImportError:
|
|
Zstd = None
|
|
|
|
|
|
class ISevenZipCompressor(ABC):
|
|
@abstractmethod
|
|
def compress(self, data: Union[bytes, bytearray, memoryview]) -> bytes:
|
|
pass
|
|
|
|
@abstractmethod
|
|
def flush(self) -> bytes:
|
|
pass
|
|
|
|
|
|
class ISevenZipDecompressor(ABC):
|
|
@abstractmethod
|
|
def decompress(self, data: Union[bytes, bytearray, memoryview], max_length: int = -1) -> bytes:
|
|
pass
|
|
|
|
|
|
class DeflateDecompressor(ISevenZipDecompressor):
|
|
def __init__(self):
|
|
self.buf = b''
|
|
self._decompressor = zlib.decompressobj(-15)
|
|
|
|
def decompress(self, data: Union[bytes, bytearray, memoryview], max_length: int = -1):
|
|
if max_length < 0:
|
|
res = self.buf + self._decompressor.decompress(data)
|
|
self.buf = b''
|
|
else:
|
|
tmp = self.buf + self._decompressor.decompress(data)
|
|
res = tmp[:max_length]
|
|
self.buf = tmp[max_length:]
|
|
return res
|
|
|
|
|
|
class CopyDecompressor(ISevenZipDecompressor):
|
|
|
|
def __init__(self):
|
|
self._buf = bytes()
|
|
|
|
def decompress(self, data: Union[bytes, bytearray, memoryview], max_length: int = -1) -> bytes:
|
|
if max_length < 0:
|
|
length = len(data)
|
|
else:
|
|
length = min(len(data), max_length)
|
|
buflen = len(self._buf)
|
|
if length > buflen:
|
|
res = self._buf + data[:length - buflen]
|
|
self._buf = data[length - buflen:]
|
|
else:
|
|
res = self._buf[:length]
|
|
self._buf = self._buf[length:] + data
|
|
return res
|
|
|
|
|
|
class ZstdDecompressor(ISevenZipDecompressor):
|
|
|
|
def __init__(self):
|
|
if Zstd is None:
|
|
raise UnsupportedCompressionMethodError
|
|
self.buf = b'' # type: bytes
|
|
self._ctc = Zstd.ZstdDecompressor() # type: ignore
|
|
|
|
def decompress(self, data: Union[bytes, bytearray, memoryview], max_length: int = -1) -> bytes:
|
|
dobj = self._ctc.decompressobj() # type: ignore
|
|
if max_length < 0:
|
|
res = self.buf + dobj.decompress(data)
|
|
self.buf = b''
|
|
else:
|
|
tmp = self.buf + dobj.decompress(data)
|
|
res = tmp[:max_length]
|
|
self.buf = tmp[max_length:]
|
|
return res
|
|
|
|
|
|
class ZstdCompressor(ISevenZipCompressor):
|
|
|
|
def __init__(self):
|
|
if Zstd is None:
|
|
raise UnsupportedCompressionMethodError
|
|
self._ctc = Zstd.ZstdCompressor() # type: ignore
|
|
|
|
def compress(self, data: Union[bytes, bytearray, memoryview]) -> bytes:
|
|
return self._ctc.compress(data) # type: ignore
|
|
|
|
def flush(self):
|
|
pass
|