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d3de7c1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 | #!/usr/bin/env python
#
# Pure python p7zr implementation
# Copyright (C) 2019-2024 Hiroshi Miura
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import hashlib
import io
from abc import ABC, abstractmethod
from typing import Optional, Union
class Py7zIO(ABC):
@abstractmethod
def write(self, s: bytes | bytearray) -> int:
pass
@abstractmethod
def read(self, size: int | None = None) -> bytes:
pass
@abstractmethod
def seek(self, offset: int, whence: int = 0) -> int:
pass
@abstractmethod
def flush(self) -> None:
pass
@abstractmethod
def size(self) -> int:
pass
class HashIO(Py7zIO):
def __init__(self, filename):
self.filename = filename
self.hash = hashlib.sha256()
self._size: int = 0
def write(self, s: bytes | bytearray) -> int:
self._size += len(s)
self.hash.update(s)
return len(s)
def read(self, length: int | None = None) -> bytes:
return self.hash.digest()
def seek(self, offset: int, whence: int = 0) -> int:
return 0
def flush(self) -> None:
pass
def size(self) -> int:
return self._size
class Py7zBytesIO(Py7zIO):
def __init__(self, filename: str, limit: int):
self.filename = filename
self.limit = limit
self._buffer = io.BytesIO()
def write(self, s: bytes | bytearray) -> int:
if self.size() < self.limit:
return self._buffer.write(s)
else:
return 0
def read(self, size: int | None = None) -> bytes:
return self._buffer.read(size)
def seek(self, offset: int, whence: int = 0) -> int:
return self._buffer.seek(offset, whence)
def flush(self) -> None:
return self._buffer.flush()
def size(self) -> int:
return self._buffer.getbuffer().nbytes
class WriterFactory(ABC):
@abstractmethod
def create(self, filename: str) -> Py7zIO:
"""request writer which compatible with BinaryIO, such as BytesIO object."""
pass
class HashIOFactory(WriterFactory):
def __init__(self):
self.products = {}
def create(self, filename: str) -> Py7zIO:
product = HashIO(filename)
self.products[filename] = product
return product
def get(self, filename: str) -> Py7zIO:
return self.products[filename]
class BytesIOFactory(WriterFactory):
def __init__(self, limit: int):
self.limit = limit
self.products: dict[str, Py7zBytesIO] = {}
def create(self, filename: str) -> Py7zIO:
product = Py7zBytesIO(filename, self.limit)
self.products[filename] = product
return product
def get(self, filename):
return self.products[filename]
class NullIOFactory(WriterFactory):
def __init__(self):
pass
def create(self, filename: str) -> Py7zIO:
return NullIO()
class MemIO:
"""pathlib.Path-like IO class to write memory"""
def __init__(self, fname: str, factory: WriterFactory):
self._buf: Py7zIO | None = None
self._closed = True
self.fname = fname
self.factory = factory
@property
def mode(self) -> str:
return self._mode
@property
def name(self) -> str:
return self.fname
@property
def closed(self) -> bool:
return self._closed
def size(self) -> int:
return self.__sizeof__()
def __sizeof__(self) -> int:
if self._buf is None:
return -1
return self._buf.size()
def flush(self) -> None:
if self._buf is not None:
self._buf.flush()
def write(self, s: bytes | bytearray) -> int:
if self._buf is None:
return -1
return self._buf.write(s)
def read(self, length: int | None = None) -> bytes:
if self._buf is None:
return b""
if length is not None:
return self._buf.read(length)
else:
return self._buf.read()
def close(self) -> None:
self._closed = True
if self._buf is not None:
self._buf.seek(0)
def seek(self, offset: int, whence: int = 0) -> int:
if self._buf is None:
return -1
return self._buf.seek(offset, whence)
def open(self, mode: str = "w"):
self._mode = mode
self._closed = False
if self._buf is None:
self._buf = self.factory.create(self.fname)
else:
self._buf.seek(0)
return self
@property
def parent(self):
return self
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
pass
class NullIO(Py7zIO):
"""pathlib.Path-like IO class of /dev/null"""
def __init__(self):
pass
def write(self, data):
return len(data)
def read(self, length=None):
if length is not None:
return bytes(length)
else:
return b""
def close(self):
pass
def flush(self):
pass
def open(self, mode=None):
return self
@property
def parent(self):
return self
def mkdir(self):
return None
def seek(self, offset: int, whence: int = 0) -> int:
return offset
def size(self):
return 0
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
pass
class BufferOverflow(Exception):
pass
class Buffer:
def __init__(self, size: int = 16):
self._buf = bytearray(size)
self._buflen = 0
self.view = memoryview(self._buf[0:0])
def add(self, data: bytes | bytearray | memoryview):
length = len(data)
self._buf[self._buflen :] = data
self._buflen += length
self.view = memoryview(self._buf[0 : self._buflen])
def reset(self) -> None:
self._buflen = 0
self.view = memoryview(self._buf[0:0])
def set(self, data: bytes | bytearray | memoryview) -> None:
length = len(data)
self._buf[0:] = data
self._buflen = length
self.view = memoryview(self._buf[0:length])
def get(self) -> bytearray:
val = self._buf[: self._buflen]
self.reset()
return val
def __len__(self) -> int:
return self._buflen
def __bytes__(self):
return bytes(self._buf[0 : self._buflen])
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