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Lector/rarfile/rarfile.py
BasioMeusPuga 10dcc14fd0 Parse cbr files
2017-11-17 00:30:56 +05:30

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# rarfile.py
#
# Copyright (c) 2005-2016 Marko Kreen <markokr@gmail.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
r"""RAR archive reader.
This is Python module for Rar archive reading. The interface
is made as :mod:`zipfile`-like as possible.
Basic logic:
- Parse archive structure with Python.
- Extract non-compressed files with Python
- Extract compressed files with unrar.
- Optionally write compressed data to temp file to speed up unrar,
otherwise it needs to scan whole archive on each execution.
Example::
import rarfile
rf = rarfile.RarFile('myarchive.rar')
for f in rf.infolist():
print f.filename, f.file_size
if f.filename == 'README':
print(rf.read(f))
Archive files can also be accessed via file-like object returned
by :meth:`RarFile.open`::
import rarfile
with rarfile.RarFile('archive.rar') as rf:
with rf.open('README') as f:
for ln in f:
print(ln.strip())
There are few module-level parameters to tune behaviour,
here they are with defaults, and reason to change it::
import rarfile
# Set to full path of unrar.exe if it is not in PATH
rarfile.UNRAR_TOOL = "unrar"
# Set to '\\' to be more compatible with old rarfile
rarfile.PATH_SEP = '/'
For more details, refer to source.
"""
from __future__ import division, print_function
##
## Imports and compat - support both Python 2.x and 3.x
##
import sys
import os
import errno
import struct
from struct import pack, unpack, Struct
from binascii import crc32, hexlify
from tempfile import mkstemp
from subprocess import Popen, PIPE, STDOUT
from io import RawIOBase
from hashlib import sha1, sha256
from hmac import HMAC
from datetime import datetime, timedelta, tzinfo
# fixed offset timezone, for UTC
try:
from datetime import timezone
except ImportError:
class timezone(tzinfo):
"""Compat timezone."""
__slots__ = ('_ofs', '_name')
_DST = timedelta(0)
def __init__(self, offset, name):
super(timezone, self).__init__()
self._ofs, self._name = offset, name
def utcoffset(self, dt):
return self._ofs
def tzname(self, dt):
return self._name
def dst(self, dt):
return self._DST
# only needed for encryped headers
try:
try:
from cryptography.hazmat.primitives.ciphers import algorithms, modes, Cipher
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf import pbkdf2
class AES_CBC_Decrypt(object):
"""Decrypt API"""
def __init__(self, key, iv):
ciph = Cipher(algorithms.AES(key), modes.CBC(iv), default_backend())
self.decrypt = ciph.decryptor().update
def pbkdf2_sha256(password, salt, iters):
"""PBKDF2 with HMAC-SHA256"""
ctx = pbkdf2.PBKDF2HMAC(hashes.SHA256(), 32, salt, iters, default_backend())
return ctx.derive(password)
except ImportError:
from Crypto.Cipher import AES
from Crypto.Protocol import KDF
class AES_CBC_Decrypt(object):
"""Decrypt API"""
def __init__(self, key, iv):
self.decrypt = AES.new(key, AES.MODE_CBC, iv).decrypt
def pbkdf2_sha256(password, salt, iters):
"""PBKDF2 with HMAC-SHA256"""
return KDF.PBKDF2(password, salt, 32, iters, hmac_sha256)
_have_crypto = 1
except ImportError:
_have_crypto = 0
try:
try:
from hashlib import blake2s
_have_blake2 = True
except ImportError:
from pyblake2 import blake2s
_have_blake2 = True
except ImportError:
_have_blake2 = False
# compat with 2.x
if sys.hexversion < 0x3000000:
def rar_crc32(data, prev=0):
"""CRC32 with unsigned values.
"""
if (prev > 0) and (prev & 0x80000000):
prev -= (1 << 32)
res = crc32(data, prev)
if res < 0:
res += (1 << 32)
return res
tohex = hexlify
_byte_code = ord
else: # pragma: no cover
def tohex(data):
"""Return hex string."""
return hexlify(data).decode('ascii')
rar_crc32 = crc32
unicode = str
_byte_code = int # noqa
# don't break 2.6 completely
if sys.hexversion < 0x2070000:
memoryview = lambda x: x # noqa
__version__ = '3.0'
# export only interesting items
__all__ = ['is_rarfile', 'RarInfo', 'RarFile', 'RarExtFile']
##
## Module configuration. Can be tuned after importing.
##
#: default fallback charset
DEFAULT_CHARSET = "windows-1252"
#: list of encodings to try, with fallback to DEFAULT_CHARSET if none succeed
TRY_ENCODINGS = ('utf8', 'utf-16le')
#: 'unrar', 'rar' or full path to either one
UNRAR_TOOL = "unrar"
#: Command line args to use for opening file for reading.
OPEN_ARGS = ('p', '-inul')
#: Command line args to use for extracting file to disk.
EXTRACT_ARGS = ('x', '-y', '-idq')
#: args for testrar()
TEST_ARGS = ('t', '-idq')
#
# Allow use of tool that is not compatible with unrar.
#
# By default use 'bsdtar' which is 'tar' program that
# sits on top of libarchive.
#
# Problems with libarchive RAR backend:
# - Does not support solid archives.
# - Does not support password-protected archives.
#
ALT_TOOL = 'bsdtar'
ALT_OPEN_ARGS = ('-x', '--to-stdout', '-f')
ALT_EXTRACT_ARGS = ('-x', '-f')
ALT_TEST_ARGS = ('-t', '-f')
ALT_CHECK_ARGS = ('--help',)
#ALT_TOOL = 'unar'
#ALT_OPEN_ARGS = ('-o', '-')
#ALT_EXTRACT_ARGS = ()
#ALT_TEST_ARGS = ('-test',) # does not work
#ALT_CHECK_ARGS = ('-v',)
#: whether to speed up decompression by using tmp archive
USE_EXTRACT_HACK = 1
#: limit the filesize for tmp archive usage
HACK_SIZE_LIMIT = 20 * 1024 * 1024
#: Separator for path name components. RAR internally uses '\\'.
#: Use '/' to be similar with zipfile.
PATH_SEP = '/'
##
## rar constants
##
# block types
RAR_BLOCK_MARK = 0x72 # r
RAR_BLOCK_MAIN = 0x73 # s
RAR_BLOCK_FILE = 0x74 # t
RAR_BLOCK_OLD_COMMENT = 0x75 # u
RAR_BLOCK_OLD_EXTRA = 0x76 # v
RAR_BLOCK_OLD_SUB = 0x77 # w
RAR_BLOCK_OLD_RECOVERY = 0x78 # x
RAR_BLOCK_OLD_AUTH = 0x79 # y
RAR_BLOCK_SUB = 0x7a # z
RAR_BLOCK_ENDARC = 0x7b # {
# flags for RAR_BLOCK_MAIN
RAR_MAIN_VOLUME = 0x0001
RAR_MAIN_COMMENT = 0x0002
RAR_MAIN_LOCK = 0x0004
RAR_MAIN_SOLID = 0x0008
RAR_MAIN_NEWNUMBERING = 0x0010
RAR_MAIN_AUTH = 0x0020
RAR_MAIN_RECOVERY = 0x0040
RAR_MAIN_PASSWORD = 0x0080
RAR_MAIN_FIRSTVOLUME = 0x0100
RAR_MAIN_ENCRYPTVER = 0x0200
# flags for RAR_BLOCK_FILE
RAR_FILE_SPLIT_BEFORE = 0x0001
RAR_FILE_SPLIT_AFTER = 0x0002
RAR_FILE_PASSWORD = 0x0004
RAR_FILE_COMMENT = 0x0008
RAR_FILE_SOLID = 0x0010
RAR_FILE_DICTMASK = 0x00e0
RAR_FILE_DICT64 = 0x0000
RAR_FILE_DICT128 = 0x0020
RAR_FILE_DICT256 = 0x0040
RAR_FILE_DICT512 = 0x0060
RAR_FILE_DICT1024 = 0x0080
RAR_FILE_DICT2048 = 0x00a0
RAR_FILE_DICT4096 = 0x00c0
RAR_FILE_DIRECTORY = 0x00e0
RAR_FILE_LARGE = 0x0100
RAR_FILE_UNICODE = 0x0200
RAR_FILE_SALT = 0x0400
RAR_FILE_VERSION = 0x0800
RAR_FILE_EXTTIME = 0x1000
RAR_FILE_EXTFLAGS = 0x2000
# flags for RAR_BLOCK_ENDARC
RAR_ENDARC_NEXT_VOLUME = 0x0001
RAR_ENDARC_DATACRC = 0x0002
RAR_ENDARC_REVSPACE = 0x0004
RAR_ENDARC_VOLNR = 0x0008
# flags common to all blocks
RAR_SKIP_IF_UNKNOWN = 0x4000
RAR_LONG_BLOCK = 0x8000
# Host OS types
RAR_OS_MSDOS = 0
RAR_OS_OS2 = 1
RAR_OS_WIN32 = 2
RAR_OS_UNIX = 3
RAR_OS_MACOS = 4
RAR_OS_BEOS = 5
# Compression methods - '0'..'5'
RAR_M0 = 0x30
RAR_M1 = 0x31
RAR_M2 = 0x32
RAR_M3 = 0x33
RAR_M4 = 0x34
RAR_M5 = 0x35
#
# RAR5 constants
#
RAR5_BLOCK_MAIN = 1
RAR5_BLOCK_FILE = 2
RAR5_BLOCK_SERVICE = 3
RAR5_BLOCK_ENCRYPTION = 4
RAR5_BLOCK_ENDARC = 5
RAR5_BLOCK_FLAG_EXTRA_DATA = 0x01
RAR5_BLOCK_FLAG_DATA_AREA = 0x02
RAR5_BLOCK_FLAG_SKIP_IF_UNKNOWN = 0x04
RAR5_BLOCK_FLAG_SPLIT_BEFORE = 0x08
RAR5_BLOCK_FLAG_SPLIT_AFTER = 0x10
RAR5_BLOCK_FLAG_DEPENDS_PREV = 0x20
RAR5_BLOCK_FLAG_KEEP_WITH_PARENT = 0x40
RAR5_MAIN_FLAG_ISVOL = 0x01
RAR5_MAIN_FLAG_HAS_VOLNR = 0x02
RAR5_MAIN_FLAG_SOLID = 0x04
RAR5_MAIN_FLAG_RECOVERY = 0x08
RAR5_MAIN_FLAG_LOCKED = 0x10
RAR5_FILE_FLAG_ISDIR = 0x01
RAR5_FILE_FLAG_HAS_MTIME = 0x02
RAR5_FILE_FLAG_HAS_CRC32 = 0x04
RAR5_FILE_FLAG_UNKNOWN_SIZE = 0x08
RAR5_COMPR_SOLID = 0x40
RAR5_ENC_FLAG_HAS_CHECKVAL = 0x01
RAR5_ENDARC_FLAG_NEXT_VOL = 0x01
RAR5_XFILE_ENCRYPTION = 1
RAR5_XFILE_HASH = 2
RAR5_XFILE_TIME = 3
RAR5_XFILE_VERSION = 4
RAR5_XFILE_REDIR = 5
RAR5_XFILE_OWNER = 6
RAR5_XFILE_SERVICE = 7
RAR5_XTIME_UNIXTIME = 0x01
RAR5_XTIME_HAS_MTIME = 0x02
RAR5_XTIME_HAS_CTIME = 0x04
RAR5_XTIME_HAS_ATIME = 0x08
RAR5_XENC_CIPHER_AES256 = 0
RAR5_XENC_CHECKVAL = 0x01
RAR5_XENC_TWEAKED = 0x02
RAR5_XHASH_BLAKE2SP = 0
RAR5_XREDIR_UNIX_SYMLINK = 1
RAR5_XREDIR_WINDOWS_SYMLINK = 2
RAR5_XREDIR_WINDOWS_JUNCTION = 3
RAR5_XREDIR_HARD_LINK = 4
RAR5_XREDIR_FILE_COPY = 5
RAR5_XREDIR_ISDIR = 0x01
RAR5_XOWNER_UNAME = 0x01
RAR5_XOWNER_GNAME = 0x02
RAR5_XOWNER_UID = 0x04
RAR5_XOWNER_GID = 0x08
RAR5_OS_WINDOWS = 0
RAR5_OS_UNIX = 1
##
## internal constants
##
RAR_ID = b"Rar!\x1a\x07\x00"
RAR5_ID = b"Rar!\x1a\x07\x01\x00"
ZERO = b'\0'
EMPTY = b''
UTC = timezone(timedelta(0), 'UTC')
BSIZE = 32 * 1024
def _get_rar_version(xfile):
"""Check quickly whether file is rar archive.
"""
with XFile(xfile) as fd:
buf = fd.read(len(RAR5_ID))
if buf.startswith(RAR_ID):
return 3
elif buf.startswith(RAR5_ID):
return 5
return 0
##
## Public interface
##
def is_rarfile(xfile):
"""Check quickly whether file is rar archive.
"""
return _get_rar_version(xfile) > 0
class Error(Exception):
"""Base class for rarfile errors."""
class BadRarFile(Error):
"""Incorrect data in archive."""
class NotRarFile(Error):
"""The file is not RAR archive."""
class BadRarName(Error):
"""Cannot guess multipart name components."""
class NoRarEntry(Error):
"""File not found in RAR"""
class PasswordRequired(Error):
"""File requires password"""
class NeedFirstVolume(Error):
"""Need to start from first volume."""
class NoCrypto(Error):
"""Cannot parse encrypted headers - no crypto available."""
class RarExecError(Error):
"""Problem reported by unrar/rar."""
class RarWarning(RarExecError):
"""Non-fatal error"""
class RarFatalError(RarExecError):
"""Fatal error"""
class RarCRCError(RarExecError):
"""CRC error during unpacking"""
class RarLockedArchiveError(RarExecError):
"""Must not modify locked archive"""
class RarWriteError(RarExecError):
"""Write error"""
class RarOpenError(RarExecError):
"""Open error"""
class RarUserError(RarExecError):
"""User error"""
class RarMemoryError(RarExecError):
"""Memory error"""
class RarCreateError(RarExecError):
"""Create error"""
class RarNoFilesError(RarExecError):
"""No files that match pattern were found"""
class RarUserBreak(RarExecError):
"""User stop"""
class RarWrongPassword(RarExecError):
"""Incorrect password"""
class RarUnknownError(RarExecError):
"""Unknown exit code"""
class RarSignalExit(RarExecError):
"""Unrar exited with signal"""
class RarCannotExec(RarExecError):
"""Executable not found."""
class RarInfo(object):
r"""An entry in rar archive.
RAR3 extended timestamps are :class:`datetime.datetime` objects without timezone.
RAR5 extended timestamps are :class:`datetime.datetime` objects with UTC timezone.
Attributes:
filename
File name with relative path.
Path separator is '/'. Always unicode string.
date_time
File modification timestamp. As tuple of (year, month, day, hour, minute, second).
RAR5 allows archives where it is missing, it's None then.
file_size
Uncompressed size.
compress_size
Compressed size.
compress_type
Compression method: one of :data:`RAR_M0` .. :data:`RAR_M5` constants.
extract_version
Minimal Rar version needed for decompressing. As (major*10 + minor),
so 2.9 is 29.
RAR3: 10, 20, 29
RAR5 does not have such field in archive, it's simply set to 50.
host_os
Host OS type, one of RAR_OS_* constants.
RAR3: :data:`RAR_OS_WIN32`, :data:`RAR_OS_UNIX`, :data:`RAR_OS_MSDOS`,
:data:`RAR_OS_OS2`, :data:`RAR_OS_BEOS`.
RAR5: :data:`RAR_OS_WIN32`, :data:`RAR_OS_UNIX`.
mode
File attributes. May be either dos-style or unix-style, depending on host_os.
mtime
File modification time. Same value as :attr:`date_time`
but as :class:`datetime.datetime` object with extended precision.
ctime
Optional time field: creation time. As :class:`datetime.datetime` object.
atime
Optional time field: last access time. As :class:`datetime.datetime` object.
arctime
Optional time field: archival time. As :class:`datetime.datetime` object.
(RAR3-only)
CRC
CRC-32 of uncompressed file, unsigned int.
RAR5: may be None.
blake2sp_hash
Blake2SP hash over decompressed data. (RAR5-only)
comment
Optional file comment field. Unicode string. (RAR3-only)
file_redir
If not None, file is link of some sort. Contains tuple of (type, flags, target).
(RAR5-only)
Type is one of constants:
:data:`RAR5_XREDIR_UNIX_SYMLINK`
unix symlink to target.
:data:`RAR5_XREDIR_WINDOWS_SYMLINK`
windows symlink to target.
:data:`RAR5_XREDIR_WINDOWS_JUNCTION`
windows junction.
:data:`RAR5_XREDIR_HARD_LINK`
hard link to target.
:data:`RAR5_XREDIR_FILE_COPY`
current file is copy of another archive entry.
Flags may contain :data:`RAR5_XREDIR_ISDIR` bit.
volume
Volume nr, starting from 0.
volume_file
Volume file name, where file starts.
"""
# zipfile-compatible fields
filename = None
file_size = None
compress_size = None
date_time = None
comment = None
CRC = None
volume = None
orig_filename = None
# optional extended time fields, datetime() objects.
mtime = None
ctime = None
atime = None
extract_version = None
mode = None
host_os = None
compress_type = None
# rar3-only fields
comment = None
arctime = None
# rar5-only fields
blake2sp_hash = None
file_redir = None
# internal fields
flags = 0
type = None
def isdir(self):
"""Returns True if entry is a directory.
"""
if self.type == RAR_BLOCK_FILE:
return (self.flags & RAR_FILE_DIRECTORY) == RAR_FILE_DIRECTORY
return False
def needs_password(self):
"""Returns True if data is stored password-protected.
"""
if self.type == RAR_BLOCK_FILE:
return (self.flags & RAR_FILE_PASSWORD) > 0
return False
class RarFile(object):
"""Parse RAR structure, provide access to files in archive.
"""
#: Archive comment. Unicode string or None.
comment = None
def __init__(self, rarfile, mode="r", charset=None, info_callback=None,
crc_check=True, errors="stop"):
"""Open and parse a RAR archive.
Parameters:
rarfile
archive file name
mode
only 'r' is supported.
charset
fallback charset to use, if filenames are not already Unicode-enabled.
info_callback
debug callback, gets to see all archive entries.
crc_check
set to False to disable CRC checks
errors
Either "stop" to quietly stop parsing on errors,
or "strict" to raise errors. Default is "stop".
"""
self._rarfile = rarfile
self._charset = charset or DEFAULT_CHARSET
self._info_callback = info_callback
self._crc_check = crc_check
self._password = None
self._file_parser = None
if errors == "stop":
self._strict = False
elif errors == "strict":
self._strict = True
else:
raise ValueError("Invalid value for 'errors' parameter.")
if mode != "r":
raise NotImplementedError("RarFile supports only mode=r")
self._parse()
def __enter__(self):
"""Open context."""
return self
def __exit__(self, typ, value, traceback):
"""Exit context"""
self.close()
def setpassword(self, password):
"""Sets the password to use when extracting.
"""
self._password = password
if self._file_parser:
if self._file_parser.has_header_encryption():
self._file_parser = None
if not self._file_parser:
self._parse()
else:
self._file_parser.setpassword(self._password)
def needs_password(self):
"""Returns True if any archive entries require password for extraction.
"""
return self._file_parser.needs_password()
def namelist(self):
"""Return list of filenames in archive.
"""
return [f.filename for f in self.infolist()]
def infolist(self):
"""Return RarInfo objects for all files/directories in archive.
"""
return self._file_parser.infolist()
def volumelist(self):
"""Returns filenames of archive volumes.
In case of single-volume archive, the list contains
just the name of main archive file.
"""
return self._file_parser.volumelist()
def getinfo(self, fname):
"""Return RarInfo for file.
"""
return self._file_parser.getinfo(fname)
def open(self, fname, mode='r', psw=None):
"""Returns file-like object (:class:`RarExtFile`) from where the data can be read.
The object implements :class:`io.RawIOBase` interface, so it can
be further wrapped with :class:`io.BufferedReader`
and :class:`io.TextIOWrapper`.
On older Python where io module is not available, it implements
only .read(), .seek(), .tell() and .close() methods.
The object is seekable, although the seeking is fast only on
uncompressed files, on compressed files the seeking is implemented
by reading ahead and/or restarting the decompression.
Parameters:
fname
file name or RarInfo instance.
mode
must be 'r'
psw
password to use for extracting.
"""
if mode != 'r':
raise NotImplementedError("RarFile.open() supports only mode=r")
# entry lookup
inf = self.getinfo(fname)
if inf.isdir():
raise TypeError("Directory does not have any data: " + inf.filename)
# check password
if inf.needs_password():
psw = psw or self._password
if psw is None:
raise PasswordRequired("File %s requires password" % inf.filename)
else:
psw = None
return self._file_parser.open(inf, psw)
def read(self, fname, psw=None):
"""Return uncompressed data for archive entry.
For longer files using :meth:`RarFile.open` may be better idea.
Parameters:
fname
filename or RarInfo instance
psw
password to use for extracting.
"""
with self.open(fname, 'r', psw) as f:
return f.read()
def close(self):
"""Release open resources."""
pass
def printdir(self):
"""Print archive file list to stdout."""
for f in self.infolist():
print(f.filename)
def extract(self, member, path=None, pwd=None):
"""Extract single file into current directory.
Parameters:
member
filename or :class:`RarInfo` instance
path
optional destination path
pwd
optional password to use
"""
if isinstance(member, RarInfo):
fname = member.filename
else:
fname = member
self._extract([fname], path, pwd)
def extractall(self, path=None, members=None, pwd=None):
"""Extract all files into current directory.
Parameters:
path
optional destination path
members
optional filename or :class:`RarInfo` instance list to extract
pwd
optional password to use
"""
fnlist = []
if members is not None:
for m in members:
if isinstance(m, RarInfo):
fnlist.append(m.filename)
else:
fnlist.append(m)
self._extract(fnlist, path, pwd)
def testrar(self):
"""Let 'unrar' test the archive.
"""
cmd = [UNRAR_TOOL] + list(TEST_ARGS)
add_password_arg(cmd, self._password)
cmd.append('--')
with XTempFile(self._rarfile) as rarfile:
cmd.append(rarfile)
p = custom_popen(cmd)
output = p.communicate()[0]
check_returncode(p, output)
def strerror(self):
"""Return error string if parsing failed or None if no problems.
"""
if not self._file_parser:
return "Not a RAR file"
return self._file_parser.strerror()
##
## private methods
##
def _parse(self):
ver = _get_rar_version(self._rarfile)
if ver == 3:
p3 = RAR3Parser(self._rarfile, self._password, self._crc_check,
self._charset, self._strict, self._info_callback)
self._file_parser = p3 # noqa
elif ver == 5:
p5 = RAR5Parser(self._rarfile, self._password, self._crc_check,
self._charset, self._strict, self._info_callback)
self._file_parser = p5 # noqa
else:
raise BadRarFile("Not a RAR file")
self._file_parser.parse()
self.comment = self._file_parser.comment
# call unrar to extract a file
def _extract(self, fnlist, path=None, psw=None):
cmd = [UNRAR_TOOL] + list(EXTRACT_ARGS)
# pasoword
psw = psw or self._password
add_password_arg(cmd, psw)
cmd.append('--')
# rar file
with XTempFile(self._rarfile) as rarfn:
cmd.append(rarfn)
# file list
for fn in fnlist:
if os.sep != PATH_SEP:
fn = fn.replace(PATH_SEP, os.sep)
cmd.append(fn)
# destination path
if path is not None:
cmd.append(path + os.sep)
# call
p = custom_popen(cmd)
output = p.communicate()[0]
check_returncode(p, output)
#
# File format parsing
#
class CommonParser(object):
"""Shared parser parts."""
_main = None
_hdrenc_main = None
_needs_password = False
_fd = None
_expect_sig = None
_parse_error = None
_password = None
comment = None
def __init__(self, rarfile, password, crc_check, charset, strict, info_cb):
self._rarfile = rarfile
self._password = password
self._crc_check = crc_check
self._charset = charset
self._strict = strict
self._info_callback = info_cb
self._info_list = []
self._info_map = {}
self._vol_list = []
def has_header_encryption(self):
"""Returns True if headers are encrypted
"""
if self._hdrenc_main:
return True
if self._main:
if self._main.flags & RAR_MAIN_PASSWORD:
return True
return False
def setpassword(self, psw):
"""Set cached password."""
self._password = psw
def volumelist(self):
"""Volume files"""
return self._vol_list
def needs_password(self):
"""Is password required"""
return self._needs_password
def strerror(self):
"""Last error"""
return self._parse_error
def infolist(self):
"""List of RarInfo records.
"""
return self._info_list
def getinfo(self, member):
"""Return RarInfo for filename
"""
if isinstance(member, RarInfo):
fname = member.filename
else:
fname = member
# accept both ways here
if PATH_SEP == '/':
fname2 = fname.replace("\\", "/")
else:
fname2 = fname.replace("/", "\\")
try:
return self._info_map[fname]
except KeyError:
try:
return self._info_map[fname2]
except KeyError:
raise NoRarEntry("No such file: %s" % fname)
# read rar
def parse(self):
"""Process file."""
self._fd = None
try:
self._parse_real()
finally:
if self._fd:
self._fd.close()
self._fd = None
def _parse_real(self):
fd = XFile(self._rarfile)
self._fd = fd
sig = fd.read(len(self._expect_sig))
if sig != self._expect_sig:
if isinstance(self._rarfile, (str, unicode)):
raise NotRarFile("Not a Rar archive: {}".format(self._rarfile))
raise NotRarFile("Not a Rar archive")
volume = 0 # first vol (.rar) is 0
more_vols = False
endarc = False
volfile = self._rarfile
self._vol_list = [self._rarfile]
while 1:
if endarc:
h = None # don't read past ENDARC
else:
h = self._parse_header(fd)
if not h:
if more_vols:
volume += 1
fd.close()
try:
volfile = self._next_volname(volfile)
fd = XFile(volfile)
except IOError:
self._set_error("Cannot open next volume: %s", volfile)
break
self._fd = fd
sig = fd.read(len(self._expect_sig))
if sig != self._expect_sig:
self._set_error("Invalid volume sig: %s", volfile)
break
more_vols = False
endarc = False
self._vol_list.append(volfile)
continue
break
h.volume = volume
h.volume_file = volfile
if h.type == RAR_BLOCK_MAIN and not self._main:
self._main = h
if h.flags & RAR_MAIN_NEWNUMBERING:
# RAR 2.x does not set FIRSTVOLUME,
# so check it only if NEWNUMBERING is used
if (h.flags & RAR_MAIN_FIRSTVOLUME) == 0:
raise NeedFirstVolume("Need to start from first volume")
if h.flags & RAR_MAIN_PASSWORD:
self._needs_password = True
if not self._password:
break
elif h.type == RAR_BLOCK_ENDARC:
more_vols = (h.flags & RAR_ENDARC_NEXT_VOLUME) > 0
endarc = True
elif h.type == RAR_BLOCK_FILE:
# RAR 2.x does not write RAR_BLOCK_ENDARC
if h.flags & RAR_FILE_SPLIT_AFTER:
more_vols = True
# RAR 2.x does not set RAR_MAIN_FIRSTVOLUME
if volume == 0 and h.flags & RAR_FILE_SPLIT_BEFORE:
raise NeedFirstVolume("Need to start from first volume")
if h.needs_password():
self._needs_password = True
# store it
self.process_entry(fd, h)
if self._info_callback:
self._info_callback(h)
# go to next header
if h.add_size > 0:
fd.seek(h.data_offset + h.add_size, 0)
def process_entry(self, fd, item):
"""Examine item, add into lookup cache."""
raise NotImplementedError()
def _decrypt_header(self, fd):
raise NotImplementedError('_decrypt_header')
def _parse_block_header(self, fd):
raise NotImplementedError('_parse_block_header')
def _open_hack(self, inf, psw):
raise NotImplementedError('_open_hack')
# read single header
def _parse_header(self, fd):
try:
# handle encrypted headers
if (self._main and self._main.flags & RAR_MAIN_PASSWORD) or self._hdrenc_main:
if not self._password:
return
fd = self._decrypt_header(fd)
# now read actual header
return self._parse_block_header(fd)
except struct.error:
self._set_error('Broken header in RAR file')
return None
# given current vol name, construct next one
def _next_volname(self, volfile):
if is_filelike(volfile):
raise IOError("Working on single FD")
if self._main.flags & RAR_MAIN_NEWNUMBERING:
return _next_newvol(volfile)
return _next_oldvol(volfile)
def _set_error(self, msg, *args):
if args:
msg = msg % args
self._parse_error = msg
if self._strict:
raise BadRarFile(msg)
def open(self, inf, psw):
"""Return stream object for file data."""
if inf.file_redir:
# cannot leave to unrar as it expects copied file to exist
if inf.file_redir[0] in (RAR5_XREDIR_FILE_COPY, RAR5_XREDIR_HARD_LINK):
inf = self.getinfo(inf.file_redir[2])
if not inf:
raise BadRarFile('cannot find copied file')
if inf.flags & RAR_FILE_SPLIT_BEFORE:
raise NeedFirstVolume("Partial file, please start from first volume: " + inf.filename)
# is temp write usable?
use_hack = 1
if not self._main:
use_hack = 0
elif self._main._must_disable_hack():
use_hack = 0
elif inf._must_disable_hack():
use_hack = 0
elif is_filelike(self._rarfile):
pass
elif inf.file_size > HACK_SIZE_LIMIT:
use_hack = 0
elif not USE_EXTRACT_HACK:
use_hack = 0
# now extract
if inf.compress_type == RAR_M0 and (inf.flags & RAR_FILE_PASSWORD) == 0 and inf.file_redir is None:
return self._open_clear(inf)
elif use_hack:
return self._open_hack(inf, psw)
elif is_filelike(self._rarfile):
return self._open_unrar_membuf(self._rarfile, inf, psw)
else:
return self._open_unrar(self._rarfile, inf, psw)
def _open_clear(self, inf):
return DirectReader(self, inf)
def _open_hack_core(self, inf, psw, prefix, suffix):
size = inf.compress_size + inf.header_size
rf = XFile(inf.volume_file, 0)
rf.seek(inf.header_offset)
tmpfd, tmpname = mkstemp(suffix='.rar')
tmpf = os.fdopen(tmpfd, "wb")
try:
tmpf.write(prefix)
while size > 0:
if size > BSIZE:
buf = rf.read(BSIZE)
else:
buf = rf.read(size)
if not buf:
raise BadRarFile('read failed: ' + inf.filename)
tmpf.write(buf)
size -= len(buf)
tmpf.write(suffix)
tmpf.close()
rf.close()
except:
rf.close()
tmpf.close()
os.unlink(tmpname)
raise
return self._open_unrar(tmpname, inf, psw, tmpname)
# write in-memory archive to temp file - needed for solid archives
def _open_unrar_membuf(self, memfile, inf, psw):
tmpname = membuf_tempfile(memfile)
return self._open_unrar(tmpname, inf, psw, tmpname, force_file=True)
# extract using unrar
def _open_unrar(self, rarfile, inf, psw=None, tmpfile=None, force_file=False):
cmd = [UNRAR_TOOL] + list(OPEN_ARGS)
add_password_arg(cmd, psw)
cmd.append("--")
cmd.append(rarfile)
# not giving filename avoids encoding related problems
if not tmpfile or force_file:
fn = inf.filename
if PATH_SEP != os.sep:
fn = fn.replace(PATH_SEP, os.sep)
cmd.append(fn)
# read from unrar pipe
return PipeReader(self, inf, cmd, tmpfile)
#
# RAR3 format
#
class Rar3Info(RarInfo):
"""RAR3 specific fields."""
extract_version = 15
salt = None
add_size = 0
header_crc = None
header_size = None
header_offset = None
data_offset = None
_md_class = None
_md_expect = None
# make sure some rar5 fields are always present
file_redir = None
blake2sp_hash = None
def _must_disable_hack(self):
if self.type == RAR_BLOCK_FILE:
if self.flags & RAR_FILE_PASSWORD:
return True
elif self.flags & (RAR_FILE_SPLIT_BEFORE | RAR_FILE_SPLIT_AFTER):
return True
elif self.type == RAR_BLOCK_MAIN:
if self.flags & (RAR_MAIN_SOLID | RAR_MAIN_PASSWORD):
return True
return False
class RAR3Parser(CommonParser):
"""Parse RAR3 file format.
"""
_expect_sig = RAR_ID
_last_aes_key = (None, None, None) # (salt, key, iv)
def _decrypt_header(self, fd):
if not _have_crypto:
raise NoCrypto('Cannot parse encrypted headers - no crypto')
salt = fd.read(8)
if self._last_aes_key[0] == salt:
key, iv = self._last_aes_key[1:]
else:
key, iv = rar3_s2k(self._password, salt)
self._last_aes_key = (salt, key, iv)
return HeaderDecrypt(fd, key, iv)
# common header
def _parse_block_header(self, fd):
h = Rar3Info()
h.header_offset = fd.tell()
# read and parse base header
buf = fd.read(S_BLK_HDR.size)
if not buf:
return None
t = S_BLK_HDR.unpack_from(buf)
h.header_crc, h.type, h.flags, h.header_size = t
# read full header
if h.header_size > S_BLK_HDR.size:
hdata = buf + fd.read(h.header_size - S_BLK_HDR.size)
else:
hdata = buf
h.data_offset = fd.tell()
# unexpected EOF?
if len(hdata) != h.header_size:
self._set_error('Unexpected EOF when reading header')
return None
pos = S_BLK_HDR.size
# block has data assiciated with it?
if h.flags & RAR_LONG_BLOCK:
h.add_size, pos = load_le32(hdata, pos)
else:
h.add_size = 0
# parse interesting ones, decide header boundaries for crc
if h.type == RAR_BLOCK_MARK:
return h
elif h.type == RAR_BLOCK_MAIN:
pos += 6
if h.flags & RAR_MAIN_ENCRYPTVER:
pos += 1
crc_pos = pos
if h.flags & RAR_MAIN_COMMENT:
self._parse_subblocks(h, hdata, pos)
elif h.type == RAR_BLOCK_FILE:
pos = self._parse_file_header(h, hdata, pos - 4)
crc_pos = pos
if h.flags & RAR_FILE_COMMENT:
pos = self._parse_subblocks(h, hdata, pos)
elif h.type == RAR_BLOCK_SUB:
pos = self._parse_file_header(h, hdata, pos - 4)
crc_pos = h.header_size
elif h.type == RAR_BLOCK_OLD_AUTH:
pos += 8
crc_pos = pos
elif h.type == RAR_BLOCK_OLD_EXTRA:
pos += 7
crc_pos = pos
else:
crc_pos = h.header_size
# check crc
if h.type == RAR_BLOCK_OLD_SUB:
crcdat = hdata[2:] + fd.read(h.add_size)
else:
crcdat = hdata[2:crc_pos]
calc_crc = rar_crc32(crcdat) & 0xFFFF
# return good header
if h.header_crc == calc_crc:
return h
# header parsing failed.
self._set_error('Header CRC error (%02x): exp=%x got=%x (xlen = %d)',
h.type, h.header_crc, calc_crc, len(crcdat))
# instead panicing, send eof
return None
# read file-specific header
def _parse_file_header(self, h, hdata, pos):
fld = S_FILE_HDR.unpack_from(hdata, pos)
pos += S_FILE_HDR.size
h.compress_size = fld[0]
h.file_size = fld[1]
h.host_os = fld[2]
h.CRC = fld[3]
h.date_time = parse_dos_time(fld[4])
h.mtime = to_datetime(h.date_time)
h.extract_version = fld[5]
h.compress_type = fld[6]
name_size = fld[7]
h.mode = fld[8]
h._md_class = CRC32Context
h._md_expect = h.CRC
if h.flags & RAR_FILE_LARGE:
h1, pos = load_le32(hdata, pos)
h2, pos = load_le32(hdata, pos)
h.compress_size |= h1 << 32
h.file_size |= h2 << 32
h.add_size = h.compress_size
name, pos = load_bytes(hdata, name_size, pos)
if h.flags & RAR_FILE_UNICODE:
nul = name.find(ZERO)
h.orig_filename = name[:nul]
u = UnicodeFilename(h.orig_filename, name[nul + 1:])
h.filename = u.decode()
# if parsing failed fall back to simple name
if u.failed:
h.filename = self._decode(h.orig_filename)
else:
h.orig_filename = name
h.filename = self._decode(name)
# change separator, if requested
if PATH_SEP != '\\':
h.filename = h.filename.replace('\\', PATH_SEP)
if h.flags & RAR_FILE_SALT:
h.salt, pos = load_bytes(hdata, 8, pos)
else:
h.salt = None
# optional extended time stamps
if h.flags & RAR_FILE_EXTTIME:
pos = _parse_ext_time(h, hdata, pos)
else:
h.mtime = h.atime = h.ctime = h.arctime = None
return pos
# find old-style comment subblock
def _parse_subblocks(self, h, hdata, pos):
while pos < len(hdata):
# ordinary block header
t = S_BLK_HDR.unpack_from(hdata, pos)
___scrc, stype, sflags, slen = t
pos_next = pos + slen
pos += S_BLK_HDR.size
# corrupt header
if pos_next < pos:
break
# followed by block-specific header
if stype == RAR_BLOCK_OLD_COMMENT and pos + S_COMMENT_HDR.size <= pos_next:
declen, ver, meth, crc = S_COMMENT_HDR.unpack_from(hdata, pos)
pos += S_COMMENT_HDR.size
data = hdata[pos : pos_next]
cmt = rar3_decompress(ver, meth, data, declen, sflags,
crc, self._password)
if not self._crc_check:
h.comment = self._decode_comment(cmt)
elif rar_crc32(cmt) & 0xFFFF == crc:
h.comment = self._decode_comment(cmt)
pos = pos_next
return pos
def _read_comment_v3(self, inf, psw=None):
# read data
with XFile(inf.volume_file) as rf:
rf.seek(inf.data_offset)
data = rf.read(inf.compress_size)
# decompress
cmt = rar3_decompress(inf.extract_version, inf.compress_type, data,
inf.file_size, inf.flags, inf.CRC, psw, inf.salt)
# check crc
if self._crc_check:
crc = rar_crc32(cmt)
if crc != inf.CRC:
return None
return self._decode_comment(cmt)
def _decode(self, val):
for c in TRY_ENCODINGS:
try:
return val.decode(c)
except UnicodeError:
pass
return val.decode(self._charset, 'replace')
def _decode_comment(self, val):
return self._decode(val)
def process_entry(self, fd, item):
if item.type == RAR_BLOCK_FILE:
# use only first part
if (item.flags & RAR_FILE_SPLIT_BEFORE) == 0:
self._info_map[item.filename] = item
self._info_list.append(item)
elif len(self._info_list) > 0:
# final crc is in last block
old = self._info_list[-1]
old.CRC = item.CRC
old._md_expect = item._md_expect
old.compress_size += item.compress_size
# parse new-style comment
if item.type == RAR_BLOCK_SUB and item.filename == 'CMT':
if item.flags & (RAR_FILE_SPLIT_BEFORE | RAR_FILE_SPLIT_AFTER):
pass
elif item.flags & RAR_FILE_SOLID:
# file comment
cmt = self._read_comment_v3(item, self._password)
if len(self._info_list) > 0:
old = self._info_list[-1]
old.comment = cmt
else:
# archive comment
cmt = self._read_comment_v3(item, self._password)
self.comment = cmt
if item.type == RAR_BLOCK_MAIN:
if item.flags & RAR_MAIN_COMMENT:
self.comment = item.comment
if item.flags & RAR_MAIN_PASSWORD:
self._needs_password = True
# put file compressed data into temporary .rar archive, and run
# unrar on that, thus avoiding unrar going over whole archive
def _open_hack(self, inf, psw):
# create main header: crc, type, flags, size, res1, res2
prefix = RAR_ID + S_BLK_HDR.pack(0x90CF, 0x73, 0, 13) + ZERO * (2 + 4)
return self._open_hack_core(inf, psw, prefix, EMPTY)
#
# RAR5 format
#
class Rar5Info(RarInfo):
"""Shared fields for RAR5 records.
"""
extract_version = 50
header_crc = None
header_size = None
header_offset = None
data_offset = None
# type=all
block_type = None
block_flags = None
add_size = 0
block_extra_size = 0
# type=MAIN
volume_number = None
_md_class = None
_md_expect = None
def _must_disable_hack(self):
return False
class Rar5BaseFile(Rar5Info):
"""Shared sturct for file & service record.
"""
type = -1
file_flags = None
file_encryption = (0, 0, 0, EMPTY, EMPTY, EMPTY)
file_compress_flags = None
file_redir = None
file_owner = None
file_version = None
blake2sp_hash = None
def _must_disable_hack(self):
if self.flags & RAR_FILE_PASSWORD:
return True
if self.block_flags & (RAR5_BLOCK_FLAG_SPLIT_BEFORE | RAR5_BLOCK_FLAG_SPLIT_AFTER):
return True
if self.file_compress_flags & RAR5_COMPR_SOLID:
return True
if self.file_redir:
return True
return False
class Rar5FileInfo(Rar5BaseFile):
"""RAR5 file record.
"""
type = RAR_BLOCK_FILE
class Rar5ServiceInfo(Rar5BaseFile):
"""RAR5 service record.
"""
type = RAR_BLOCK_SUB
class Rar5MainInfo(Rar5Info):
"""RAR5 archive main record.
"""
type = RAR_BLOCK_MAIN
main_flags = None
main_volume_number = None
def _must_disable_hack(self):
if self.main_flags & RAR5_MAIN_FLAG_SOLID:
return True
return False
class Rar5EncryptionInfo(Rar5Info):
"""RAR5 archive header encryption record.
"""
type = RAR5_BLOCK_ENCRYPTION
encryption_algo = None
encryption_flags = None
encryption_kdf_count = None
encryption_salt = None
encryption_check_value = None
def needs_password(self):
return True
class Rar5EndArcInfo(Rar5Info):
"""RAR5 end of archive record.
"""
type = RAR_BLOCK_ENDARC
endarc_flags = None
class RAR5Parser(CommonParser):
"""Parse RAR5 format.
"""
_expect_sig = RAR5_ID
_hdrenc_main = None
# AES encrypted headers
_last_aes256_key = (-1, None, None) # (kdf_count, salt, key)
def _gen_key(self, kdf_count, salt):
if self._last_aes256_key[:2] == (kdf_count, salt):
return self._last_aes256_key[2]
if kdf_count > 24:
raise BadRarFile('Too large kdf_count')
psw = self._password
if isinstance(psw, unicode):
psw = psw.encode('utf8')
key = pbkdf2_sha256(psw, salt, 1 << kdf_count)
self._last_aes256_key = (kdf_count, salt, key)
return key
def _decrypt_header(self, fd):
if not _have_crypto:
raise NoCrypto('Cannot parse encrypted headers - no crypto')
h = self._hdrenc_main
key = self._gen_key(h.encryption_kdf_count, h.encryption_salt)
iv = fd.read(16)
return HeaderDecrypt(fd, key, iv)
# common header
def _parse_block_header(self, fd):
header_offset = fd.tell()
preload = 4 + 3
start_bytes = fd.read(preload)
header_crc, pos = load_le32(start_bytes, 0)
hdrlen, pos = load_vint(start_bytes, pos)
if hdrlen > 2 * 1024 * 1024:
return None
header_size = pos + hdrlen
# read full header, check for EOF
hdata = start_bytes + fd.read(header_size - len(start_bytes))
if len(hdata) != header_size:
self._set_error('Unexpected EOF when reading header')
return None
data_offset = fd.tell()
calc_crc = rar_crc32(memoryview(hdata)[4:])
if header_crc != calc_crc:
# header parsing failed.
self._set_error('Header CRC error: exp=%x got=%x (xlen = %d)',
header_crc, calc_crc, len(hdata))
return None
block_type, pos = load_vint(hdata, pos)
if block_type == RAR5_BLOCK_MAIN:
h, pos = self._parse_block_common(Rar5MainInfo(), hdata)
h = self._parse_main_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_FILE:
h, pos = self._parse_block_common(Rar5FileInfo(), hdata)
h = self._parse_file_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_SERVICE:
h, pos = self._parse_block_common(Rar5ServiceInfo(), hdata)
h = self._parse_file_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_ENCRYPTION:
h, pos = self._parse_block_common(Rar5EncryptionInfo(), hdata)
h = self._parse_encryption_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_ENDARC:
h, pos = self._parse_block_common(Rar5EndArcInfo(), hdata)
h = self._parse_endarc_block(h, hdata, pos)
else:
h = None
if h:
h.header_offset = header_offset
h.data_offset = data_offset
return h
def _parse_block_common(self, h, hdata):
h.header_crc, pos = load_le32(hdata, 0)
hdrlen, pos = load_vint(hdata, pos)
h.header_size = hdrlen + pos
h.block_type, pos = load_vint(hdata, pos)
h.block_flags, pos = load_vint(hdata, pos)
if h.block_flags & RAR5_BLOCK_FLAG_EXTRA_DATA:
h.block_extra_size, pos = load_vint(hdata, pos)
if h.block_flags & RAR5_BLOCK_FLAG_DATA_AREA:
h.add_size, pos = load_vint(hdata, pos)
h.compress_size = h.add_size
if h.block_flags & RAR5_BLOCK_FLAG_SKIP_IF_UNKNOWN:
h.flags |= RAR_SKIP_IF_UNKNOWN
if h.block_flags & RAR5_BLOCK_FLAG_DATA_AREA:
h.flags |= RAR_LONG_BLOCK
return h, pos
def _parse_main_block(self, h, hdata, pos):
h.main_flags, pos = load_vint(hdata, pos)
if h.main_flags & RAR5_MAIN_FLAG_HAS_VOLNR:
h.main_volume_number = load_vint(hdata, pos)
h.flags |= RAR_MAIN_NEWNUMBERING
if h.main_flags & RAR5_MAIN_FLAG_SOLID:
h.flags |= RAR_MAIN_SOLID
if h.main_flags & RAR5_MAIN_FLAG_ISVOL:
h.flags |= RAR_MAIN_VOLUME
if h.main_flags & RAR5_MAIN_FLAG_RECOVERY:
h.flags |= RAR_MAIN_RECOVERY
if self._hdrenc_main:
h.flags |= RAR_MAIN_PASSWORD
if h.main_flags & RAR5_MAIN_FLAG_HAS_VOLNR == 0:
h.flags |= RAR_MAIN_FIRSTVOLUME
return h
def _parse_file_block(self, h, hdata, pos):
h.file_flags, pos = load_vint(hdata, pos)
h.file_size, pos = load_vint(hdata, pos)
h.mode, pos = load_vint(hdata, pos)
if h.file_flags & RAR5_FILE_FLAG_HAS_MTIME:
h.mtime, pos = load_unixtime(hdata, pos)
h.date_time = h.mtime.timetuple()[:6]
if h.file_flags & RAR5_FILE_FLAG_HAS_CRC32:
h.CRC, pos = load_le32(hdata, pos)
h._md_class = CRC32Context
h._md_expect = h.CRC
h.file_compress_flags, pos = load_vint(hdata, pos)
h.file_host_os, pos = load_vint(hdata, pos)
h.orig_filename, pos = load_vstr(hdata, pos)
h.filename = h.orig_filename.decode('utf8', 'replace')
# use compatible values
if h.file_host_os == RAR5_OS_WINDOWS:
h.host_os = RAR_OS_WIN32
else:
h.host_os = RAR_OS_UNIX
h.compress_type = RAR_M0 + ((h.file_compress_flags >> 7) & 7)
if h.block_extra_size:
# allow 1 byte of garbage
while pos < len(hdata) - 1:
xsize, pos = load_vint(hdata, pos)
xdata, pos = load_bytes(hdata, xsize, pos)
self._process_file_extra(h, xdata)
if h.block_flags & RAR5_BLOCK_FLAG_SPLIT_BEFORE:
h.flags |= RAR_FILE_SPLIT_BEFORE
if h.block_flags & RAR5_BLOCK_FLAG_SPLIT_AFTER:
h.flags |= RAR_FILE_SPLIT_AFTER
if h.file_flags & RAR5_FILE_FLAG_ISDIR:
h.flags |= RAR_FILE_DIRECTORY
if h.file_compress_flags & RAR5_COMPR_SOLID:
h.flags |= RAR_FILE_SOLID
return h
def _parse_endarc_block(self, h, hdata, pos):
h.endarc_flags, pos = load_vint(hdata, pos)
if h.endarc_flags & RAR5_ENDARC_FLAG_NEXT_VOL:
h.flags |= RAR_ENDARC_NEXT_VOLUME
return h
def _parse_encryption_block(self, h, hdata, pos):
h.encryption_algo, pos = load_vint(hdata, pos)
h.encryption_flags, pos = load_vint(hdata, pos)
h.encryption_kdf_count, pos = load_byte(hdata, pos)
h.encryption_salt, pos = load_bytes(hdata, 16, pos)
if h.encryption_flags & RAR5_ENC_FLAG_HAS_CHECKVAL:
h.encryption_check_value = load_bytes(hdata, 12, pos)
if h.encryption_algo != RAR5_XENC_CIPHER_AES256:
raise BadRarFile('Unsupported header encryption cipher')
self._hdrenc_main = h
return h
# file extra record
def _process_file_extra(self, h, xdata):
xtype, pos = load_vint(xdata, 0)
if xtype == RAR5_XFILE_TIME:
self._parse_file_xtime(h, xdata, pos)
elif xtype == RAR5_XFILE_ENCRYPTION:
self._parse_file_encryption(h, xdata, pos)
elif xtype == RAR5_XFILE_HASH:
self._parse_file_hash(h, xdata, pos)
elif xtype == RAR5_XFILE_VERSION:
self._parse_file_version(h, xdata, pos)
elif xtype == RAR5_XFILE_REDIR:
self._parse_file_redir(h, xdata, pos)
elif xtype == RAR5_XFILE_OWNER:
self._parse_file_owner(h, xdata, pos)
elif xtype == RAR5_XFILE_SERVICE:
pass
else:
pass
# extra block for file time record
def _parse_file_xtime(self, h, xdata, pos):
tflags, pos = load_vint(xdata, pos)
ldr = load_windowstime
if tflags & RAR5_XTIME_UNIXTIME:
ldr = load_unixtime
if tflags & RAR5_XTIME_HAS_MTIME:
h.mtime, pos = ldr(xdata, pos)
h.date_time = h.mtime.timetuple()[:6]
if tflags & RAR5_XTIME_HAS_CTIME:
h.ctime, pos = ldr(xdata, pos)
if tflags & RAR5_XTIME_HAS_ATIME:
h.atime, pos = ldr(xdata, pos)
# just remember encryption info
def _parse_file_encryption(self, h, xdata, pos):
algo, pos = load_vint(xdata, pos)
flags, pos = load_vint(xdata, pos)
kdf_count, pos = load_byte(xdata, pos)
salt, pos = load_bytes(xdata, 16, pos)
iv, pos = load_bytes(xdata, 16, pos)
checkval = None
if flags & RAR5_XENC_CHECKVAL:
checkval, pos = load_bytes(xdata, 12, pos)
if flags & RAR5_XENC_TWEAKED:
h._md_expect = None
h._md_class = NoHashContext
h.file_encryption = (algo, flags, kdf_count, salt, iv, checkval)
h.flags |= RAR_FILE_PASSWORD
def _parse_file_hash(self, h, xdata, pos):
hash_type, pos = load_vint(xdata, pos)
if hash_type == RAR5_XHASH_BLAKE2SP:
h.blake2sp_hash, pos = load_bytes(xdata, 32, pos)
if _have_blake2 and (h.file_encryption[1] & RAR5_XENC_TWEAKED) == 0:
h._md_class = Blake2SP
h._md_expect = h.blake2sp_hash
def _parse_file_version(self, h, xdata, pos):
flags, pos = load_vint(xdata, pos)
version, pos = load_vint(xdata, pos)
h.file_version = (flags, version)
def _parse_file_redir(self, h, xdata, pos):
redir_type, pos = load_vint(xdata, pos)
redir_flags, pos = load_vint(xdata, pos)
redir_name, pos = load_vstr(xdata, pos)
redir_name = redir_name.decode('utf8', 'replace')
h.file_redir = (redir_type, redir_flags, redir_name)
def _parse_file_owner(self, h, xdata, pos):
user_name = group_name = user_id = group_id = None
flags, pos = load_vint(xdata, pos)
if flags & RAR5_XOWNER_UNAME:
user_name, pos = load_vstr(xdata, pos)
if flags & RAR5_XOWNER_GNAME:
group_name, pos = load_vstr(xdata, pos)
if flags & RAR5_XOWNER_UID:
user_id, pos = load_vint(xdata, pos)
if flags & RAR5_XOWNER_GID:
group_id, pos = load_vint(xdata, pos)
h.file_owner = (user_name, group_name, user_id, group_id)
def process_entry(self, fd, item):
if item.block_type == RAR5_BLOCK_FILE:
# use only first part
if (item.block_flags & RAR5_BLOCK_FLAG_SPLIT_BEFORE) == 0:
self._info_map[item.filename] = item
self._info_list.append(item)
elif len(self._info_list) > 0:
# final crc is in last block
old = self._info_list[-1]
old.CRC = item.CRC
old._md_expect = item._md_expect
old.blake2sp_hash = item.blake2sp_hash
old.compress_size += item.compress_size
elif item.block_type == RAR5_BLOCK_SERVICE:
if item.filename == 'CMT':
self._load_comment(fd, item)
def _load_comment(self, fd, item):
if item.block_flags & (RAR5_BLOCK_FLAG_SPLIT_BEFORE | RAR5_BLOCK_FLAG_SPLIT_AFTER):
return None
if item.compress_type != RAR_M0:
return None
if item.flags & RAR_FILE_PASSWORD:
algo, ___flags, kdf_count, salt, iv, ___checkval = item.file_encryption
if algo != RAR5_XENC_CIPHER_AES256:
return None
key = self._gen_key(kdf_count, salt)
f = HeaderDecrypt(fd, key, iv)
cmt = f.read(item.file_size)
else:
# archive comment
with self._open_clear(item) as cmtstream:
cmt = cmtstream.read()
# rar bug? - appends zero to comment
cmt = cmt.split(ZERO, 1)[0]
self.comment = cmt.decode('utf8')
def _open_hack(self, inf, psw):
# len, type, blk_flags, flags
main_hdr = b'\x03\x01\x00\x00'
endarc_hdr = b'\x03\x05\x00\x00'
main_hdr = S_LONG.pack(rar_crc32(main_hdr)) + main_hdr
endarc_hdr = S_LONG.pack(rar_crc32(endarc_hdr)) + endarc_hdr
return self._open_hack_core(inf, psw, RAR5_ID + main_hdr, endarc_hdr)
##
## Utility classes
##
class UnicodeFilename(object):
"""Handle RAR3 unicode filename decompression.
"""
def __init__(self, name, encdata):
self.std_name = bytearray(name)
self.encdata = bytearray(encdata)
self.pos = self.encpos = 0
self.buf = bytearray()
self.failed = 0
def enc_byte(self):
"""Copy encoded byte."""
try:
c = self.encdata[self.encpos]
self.encpos += 1
return c
except IndexError:
self.failed = 1
return 0
def std_byte(self):
"""Copy byte from 8-bit representation."""
try:
return self.std_name[self.pos]
except IndexError:
self.failed = 1
return ord('?')
def put(self, lo, hi):
"""Copy 16-bit value to result."""
self.buf.append(lo)
self.buf.append(hi)
self.pos += 1
def decode(self):
"""Decompress compressed UTF16 value."""
hi = self.enc_byte()
flagbits = 0
while self.encpos < len(self.encdata):
if flagbits == 0:
flags = self.enc_byte()
flagbits = 8
flagbits -= 2
t = (flags >> flagbits) & 3
if t == 0:
self.put(self.enc_byte(), 0)
elif t == 1:
self.put(self.enc_byte(), hi)
elif t == 2:
self.put(self.enc_byte(), self.enc_byte())
else:
n = self.enc_byte()
if n & 0x80:
c = self.enc_byte()
for _ in range((n & 0x7f) + 2):
lo = (self.std_byte() + c) & 0xFF
self.put(lo, hi)
else:
for _ in range(n + 2):
self.put(self.std_byte(), 0)
return self.buf.decode("utf-16le", "replace")
class RarExtFile(RawIOBase):
"""Base class for file-like object that :meth:`RarFile.open` returns.
Provides public methods and common crc checking.
Behaviour:
- no short reads - .read() and .readinfo() read as much as requested.
- no internal buffer, use io.BufferedReader for that.
"""
#: Filename of the archive entry
name = None
def __init__(self, parser, inf):
"""Open archive entry.
"""
super(RarExtFile, self).__init__()
# standard io.* properties
self.name = inf.filename
self.mode = 'rb'
self._parser = parser
self._inf = inf
self._fd = None
self._remain = 0
self._returncode = 0
self._md_context = None
self._open()
def _open(self):
if self._fd:
self._fd.close()
md_class = self._inf._md_class or NoHashContext
self._md_context = md_class()
self._fd = None
self._remain = self._inf.file_size
def read(self, cnt=None):
"""Read all or specified amount of data from archive entry."""
# sanitize cnt
if cnt is None or cnt < 0:
cnt = self._remain
elif cnt > self._remain:
cnt = self._remain
if cnt == 0:
return EMPTY
# actual read
data = self._read(cnt)
if data:
self._md_context.update(data)
self._remain -= len(data)
if len(data) != cnt:
raise BadRarFile("Failed the read enough data")
# done?
if not data or self._remain == 0:
# self.close()
self._check()
return data
def _check(self):
"""Check final CRC."""
final = self._md_context.digest()
exp = self._inf._md_expect
if exp is None:
return
if final is None:
return
if self._returncode:
check_returncode(self, '')
if self._remain != 0:
raise BadRarFile("Failed the read enough data")
if final != exp:
raise BadRarFile("Corrupt file - CRC check failed: %s - exp=%r got=%r" % (
self._inf.filename, exp, final))
def _read(self, cnt):
"""Actual read that gets sanitized cnt."""
def close(self):
"""Close open resources."""
super(RarExtFile, self).close()
if self._fd:
self._fd.close()
self._fd = None
def __del__(self):
"""Hook delete to make sure tempfile is removed."""
self.close()
def readinto(self, buf):
"""Zero-copy read directly into buffer.
Returns bytes read.
"""
raise NotImplementedError('readinto')
def tell(self):
"""Return current reading position in uncompressed data."""
return self._inf.file_size - self._remain
def seek(self, ofs, whence=0):
"""Seek in data.
On uncompressed files, the seeking works by actual
seeks so it's fast. On compresses files its slow
- forward seeking happends by reading ahead,
backwards by re-opening and decompressing from the start.
"""
# disable crc check when seeking
self._md_context = NoHashContext()
fsize = self._inf.file_size
cur_ofs = self.tell()
if whence == 0: # seek from beginning of file
new_ofs = ofs
elif whence == 1: # seek from current position
new_ofs = cur_ofs + ofs
elif whence == 2: # seek from end of file
new_ofs = fsize + ofs
else:
raise ValueError('Invalid value for whence')
# sanity check
if new_ofs < 0:
new_ofs = 0
elif new_ofs > fsize:
new_ofs = fsize
# do the actual seek
if new_ofs >= cur_ofs:
self._skip(new_ofs - cur_ofs)
else:
# reopen and seek
self._open()
self._skip(new_ofs)
return self.tell()
def _skip(self, cnt):
"""Read and discard data"""
while cnt > 0:
if cnt > 8192:
buf = self.read(8192)
else:
buf = self.read(cnt)
if not buf:
break
cnt -= len(buf)
def readable(self):
"""Returns True"""
return True
def writable(self):
"""Returns False.
Writing is not supported.
"""
return False
def seekable(self):
"""Returns True.
Seeking is supported, although it's slow on compressed files.
"""
return True
def readall(self):
"""Read all remaining data"""
# avoid RawIOBase default impl
return self.read()
class PipeReader(RarExtFile):
"""Read data from pipe, handle tempfile cleanup."""
def __init__(self, rf, inf, cmd, tempfile=None):
self._cmd = cmd
self._proc = None
self._tempfile = tempfile
super(PipeReader, self).__init__(rf, inf)
def _close_proc(self):
if not self._proc:
return
if self._proc.stdout:
self._proc.stdout.close()
if self._proc.stdin:
self._proc.stdin.close()
if self._proc.stderr:
self._proc.stderr.close()
self._proc.wait()
self._returncode = self._proc.returncode
self._proc = None
def _open(self):
super(PipeReader, self)._open()
# stop old process
self._close_proc()
# launch new process
self._returncode = 0
self._proc = custom_popen(self._cmd)
self._fd = self._proc.stdout
# avoid situation where unrar waits on stdin
if self._proc.stdin:
self._proc.stdin.close()
def _read(self, cnt):
"""Read from pipe."""
# normal read is usually enough
data = self._fd.read(cnt)
if len(data) == cnt or not data:
return data
# short read, try looping
buf = [data]
cnt -= len(data)
while cnt > 0:
data = self._fd.read(cnt)
if not data:
break
cnt -= len(data)
buf.append(data)
return EMPTY.join(buf)
def close(self):
"""Close open resources."""
self._close_proc()
super(PipeReader, self).close()
if self._tempfile:
try:
os.unlink(self._tempfile)
except OSError:
pass
self._tempfile = None
def readinto(self, buf):
"""Zero-copy read directly into buffer."""
cnt = len(buf)
if cnt > self._remain:
cnt = self._remain
vbuf = memoryview(buf)
res = got = 0
while got < cnt:
res = self._fd.readinto(vbuf[got : cnt])
if not res:
break
self._md_context.update(vbuf[got : got + res])
self._remain -= res
got += res
return got
class DirectReader(RarExtFile):
"""Read uncompressed data directly from archive.
"""
_cur = None
_cur_avail = None
_volfile = None
def _open(self):
super(DirectReader, self)._open()
self._volfile = self._inf.volume_file
self._fd = XFile(self._volfile, 0)
self._fd.seek(self._inf.header_offset, 0)
self._cur = self._parser._parse_header(self._fd)
self._cur_avail = self._cur.add_size
def _skip(self, cnt):
"""RAR Seek, skipping through rar files to get to correct position
"""
while cnt > 0:
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# fd is in read pos, do the read
if cnt > self._cur_avail:
cnt -= self._cur_avail
self._remain -= self._cur_avail
self._cur_avail = 0
else:
self._fd.seek(cnt, 1)
self._cur_avail -= cnt
self._remain -= cnt
cnt = 0
def _read(self, cnt):
"""Read from potentially multi-volume archive."""
buf = []
while cnt > 0:
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# fd is in read pos, do the read
if cnt > self._cur_avail:
data = self._fd.read(self._cur_avail)
else:
data = self._fd.read(cnt)
if not data:
break
# got some data
cnt -= len(data)
self._cur_avail -= len(data)
buf.append(data)
if len(buf) == 1:
return buf[0]
return EMPTY.join(buf)
def _open_next(self):
"""Proceed to next volume."""
# is the file split over archives?
if (self._cur.flags & RAR_FILE_SPLIT_AFTER) == 0:
return False
if self._fd:
self._fd.close()
self._fd = None
# open next part
self._volfile = self._parser._next_volname(self._volfile)
fd = open(self._volfile, "rb", 0)
self._fd = fd
sig = fd.read(len(self._parser._expect_sig))
if sig != self._parser._expect_sig:
raise BadRarFile("Invalid signature")
# loop until first file header
while 1:
cur = self._parser._parse_header(fd)
if not cur:
raise BadRarFile("Unexpected EOF")
if cur.type in (RAR_BLOCK_MARK, RAR_BLOCK_MAIN):
if cur.add_size:
fd.seek(cur.add_size, 1)
continue
if cur.orig_filename != self._inf.orig_filename:
raise BadRarFile("Did not found file entry")
self._cur = cur
self._cur_avail = cur.add_size
return True
def readinto(self, buf):
"""Zero-copy read directly into buffer."""
got = 0
vbuf = memoryview(buf)
while got < len(buf):
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# length for next read
cnt = len(buf) - got
if cnt > self._cur_avail:
cnt = self._cur_avail
# read into temp view
res = self._fd.readinto(vbuf[got : got + cnt])
if not res:
break
self._md_context.update(vbuf[got : got + res])
self._cur_avail -= res
self._remain -= res
got += res
return got
class HeaderDecrypt(object):
"""File-like object that decrypts from another file"""
def __init__(self, f, key, iv):
self.f = f
self.ciph = AES_CBC_Decrypt(key, iv)
self.buf = EMPTY
def tell(self):
"""Current file pos - works only on block boundaries."""
return self.f.tell()
def read(self, cnt=None):
"""Read and decrypt."""
if cnt > 8 * 1024:
raise BadRarFile('Bad count to header decrypt - wrong password?')
# consume old data
if cnt <= len(self.buf):
res = self.buf[:cnt]
self.buf = self.buf[cnt:]
return res
res = self.buf
self.buf = EMPTY
cnt -= len(res)
# decrypt new data
blklen = 16
while cnt > 0:
enc = self.f.read(blklen)
if len(enc) < blklen:
break
dec = self.ciph.decrypt(enc)
if cnt >= len(dec):
res += dec
cnt -= len(dec)
else:
res += dec[:cnt]
self.buf = dec[cnt:]
cnt = 0
return res
# handle (filename|filelike) object
class XFile(object):
"""Input may be filename or file object.
"""
__slots__ = ('_fd', '_need_close')
def __init__(self, xfile, bufsize=1024):
if is_filelike(xfile):
self._need_close = False
self._fd = xfile
self._fd.seek(0)
else:
self._need_close = True
self._fd = open(xfile, 'rb', bufsize)
def read(self, n=None):
"""Read from file."""
return self._fd.read(n)
def tell(self):
"""Return file pos."""
return self._fd.tell()
def seek(self, ofs, whence=0):
"""Move file pos."""
return self._fd.seek(ofs, whence)
def readinto(self, dst):
"""Read into buffer."""
return self._fd.readinto(dst)
def close(self):
"""Close file object."""
if self._need_close:
self._fd.close()
def __enter__(self):
return self
def __exit__(self, typ, val, tb):
self.close()
class NoHashContext(object):
"""No-op hash function."""
def __init__(self, data=None):
"""Initialize"""
def update(self, data):
"""Update data"""
def digest(self):
"""Final hash"""
def hexdigest(self):
"""Hexadecimal digest."""
class CRC32Context(object):
"""Hash context that uses CRC32."""
__slots__ = ['_crc']
def __init__(self, data=None):
self._crc = 0
if data:
self.update(data)
def update(self, data):
"""Process data."""
self._crc = rar_crc32(data, self._crc)
def digest(self):
"""Final hash."""
return self._crc
def hexdigest(self):
"""Hexadecimal digest."""
return '%08x' % self.digest()
class Blake2SP(object):
"""Blake2sp hash context.
"""
__slots__ = ['_thread', '_buf', '_cur', '_digest']
digest_size = 32
block_size = 64
parallelism = 8
def __init__(self, data=None):
self._buf = b''
self._cur = 0
self._digest = None
self._thread = []
for i in range(self.parallelism):
ctx = self._blake2s(i, 0, i == (self.parallelism - 1))
self._thread.append(ctx)
if data:
self.update(data)
def _blake2s(self, ofs, depth, is_last):
return blake2s(node_offset=ofs, node_depth=depth, last_node=is_last,
depth=2, inner_size=32, fanout=self.parallelism)
def _add_block(self, blk):
self._thread[self._cur].update(blk)
self._cur = (self._cur + 1) % self.parallelism
def update(self, data):
"""Hash data.
"""
view = memoryview(data)
bs = self.block_size
if self._buf:
need = bs - len(self._buf)
if len(view) < need:
self._buf += view.tobytes()
return
self._add_block(self._buf + view[:need].tobytes())
view = view[need:]
while len(view) >= bs:
self._add_block(view[:bs])
view = view[bs:]
self._buf = view.tobytes()
def digest(self):
"""Return final digest value.
"""
if self._digest is None:
if self._buf:
self._add_block(self._buf)
self._buf = EMPTY
ctx = self._blake2s(0, 1, True)
for t in self._thread:
ctx.update(t.digest())
self._digest = ctx.digest()
return self._digest
def hexdigest(self):
"""Hexadecimal digest."""
return tohex(self.digest())
class Rar3Sha1(object):
"""Bug-compat for SHA1
"""
digest_size = 20
block_size = 64
_BLK_BE = struct.Struct(b'>16L')
_BLK_LE = struct.Struct(b'<16L')
__slots__ = ('_nbytes', '_md', '_rarbug')
def __init__(self, data=b'', rarbug=False):
self._md = sha1()
self._nbytes = 0
self._rarbug = rarbug
self.update(data)
def update(self, data):
"""Process more data."""
self._md.update(data)
bufpos = self._nbytes & 63
self._nbytes += len(data)
if self._rarbug and len(data) > 64:
dpos = self.block_size - bufpos
while dpos + self.block_size <= len(data):
self._corrupt(data, dpos)
dpos += self.block_size
def digest(self):
"""Return final state."""
return self._md.digest()
def hexdigest(self):
"""Return final state as hex string."""
return self._md.hexdigest()
def _corrupt(self, data, dpos):
"""Corruption from SHA1 core."""
ws = list(self._BLK_BE.unpack_from(data, dpos))
for t in range(16, 80):
tmp = ws[(t - 3) & 15] ^ ws[(t - 8) & 15] ^ ws[(t - 14) & 15] ^ ws[(t - 16) & 15]
ws[t & 15] = ((tmp << 1) | (tmp >> (32 - 1))) & 0xFFFFFFFF
self._BLK_LE.pack_into(data, dpos, *ws)
##
## Utility functions
##
S_LONG = Struct('<L')
S_SHORT = Struct('<H')
S_BYTE = Struct('<B')
S_BLK_HDR = Struct('<HBHH')
S_FILE_HDR = Struct('<LLBLLBBHL')
S_COMMENT_HDR = Struct('<HBBH')
def load_vint(buf, pos):
"""Load variable-size int."""
limit = min(pos + 11, len(buf))
res = ofs = 0
while pos < limit:
b = _byte_code(buf[pos])
res += ((b & 0x7F) << ofs)
pos += 1
ofs += 7
if b < 0x80:
return res, pos
raise BadRarFile('cannot load vint')
def load_byte(buf, pos):
"""Load single byte"""
end = pos + 1
if end > len(buf):
raise BadRarFile('cannot load byte')
return S_BYTE.unpack_from(buf, pos)[0], end
def load_le32(buf, pos):
"""Load little-endian 32-bit integer"""
end = pos + 4
if end > len(buf):
raise BadRarFile('cannot load le32')
return S_LONG.unpack_from(buf, pos)[0], pos + 4
def load_bytes(buf, num, pos):
"""Load sequence of bytes"""
end = pos + num
if end > len(buf):
raise BadRarFile('cannot load bytes')
return buf[pos : end], end
def load_vstr(buf, pos):
"""Load bytes prefixed by vint length"""
slen, pos = load_vint(buf, pos)
return load_bytes(buf, slen, pos)
def load_dostime(buf, pos):
"""Load LE32 dos timestamp"""
stamp, pos = load_le32(buf, pos)
tup = parse_dos_time(stamp)
return to_datetime(tup), pos
def load_unixtime(buf, pos):
"""Load LE32 unix timestamp"""
secs, pos = load_le32(buf, pos)
dt = datetime.fromtimestamp(secs, UTC)
return dt, pos
def load_windowstime(buf, pos):
"""Load LE64 windows timestamp"""
# unix epoch (1970) in seconds from windows epoch (1601)
unix_epoch = 11644473600
val1, pos = load_le32(buf, pos)
val2, pos = load_le32(buf, pos)
secs, n1secs = divmod((val2 << 32) | val1, 10000000)
dt = datetime.fromtimestamp(secs - unix_epoch, UTC)
dt = dt.replace(microsecond=n1secs // 10)
return dt, pos
# new-style next volume
def _next_newvol(volfile):
i = len(volfile) - 1
while i >= 0:
if volfile[i] >= '0' and volfile[i] <= '9':
return _inc_volname(volfile, i)
i -= 1
raise BadRarName("Cannot construct volume name: " + volfile)
# old-style next volume
def _next_oldvol(volfile):
# rar -> r00
if volfile[-4:].lower() == '.rar':
return volfile[:-2] + '00'
return _inc_volname(volfile, len(volfile) - 1)
# increase digits with carry, otherwise just increment char
def _inc_volname(volfile, i):
fn = list(volfile)
while i >= 0:
if fn[i] != '9':
fn[i] = chr(ord(fn[i]) + 1)
break
fn[i] = '0'
i -= 1
return ''.join(fn)
# rar3 extended time fields
def _parse_ext_time(h, data, pos):
# flags and rest of data can be missing
flags = 0
if pos + 2 <= len(data):
flags = S_SHORT.unpack_from(data, pos)[0]
pos += 2
mtime, pos = _parse_xtime(flags >> 3 * 4, data, pos, h.mtime)
h.ctime, pos = _parse_xtime(flags >> 2 * 4, data, pos)
h.atime, pos = _parse_xtime(flags >> 1 * 4, data, pos)
h.arctime, pos = _parse_xtime(flags >> 0 * 4, data, pos)
if mtime:
h.mtime = mtime
h.date_time = mtime.timetuple()[:6]
return pos
# rar3 one extended time field
def _parse_xtime(flag, data, pos, basetime=None):
res = None
if flag & 8:
if not basetime:
basetime, pos = load_dostime(data, pos)
# load second fractions
rem = 0
cnt = flag & 3
for _ in range(cnt):
b, pos = load_byte(data, pos)
rem = (b << 16) | (rem >> 8)
# convert 100ns units to microseconds
usec = rem // 10
if usec > 1000000:
usec = 999999
# dostime has room for 30 seconds only, correct if needed
if flag & 4 and basetime.second < 59:
res = basetime.replace(microsecond=usec, second=basetime.second + 1)
else:
res = basetime.replace(microsecond=usec)
return res, pos
def is_filelike(obj):
"""Filename or file object?
"""
if isinstance(obj, (bytes, unicode)):
return False
res = True
for a in ('read', 'tell', 'seek'):
res = res and hasattr(obj, a)
if not res:
raise ValueError("Invalid object passed as file")
return True
def rar3_s2k(psw, salt):
"""String-to-key hash for RAR3.
"""
if not isinstance(psw, unicode):
psw = psw.decode('utf8')
seed = bytearray(psw.encode('utf-16le') + salt)
h = Rar3Sha1(rarbug=True)
iv = EMPTY
for i in range(16):
for j in range(0x4000):
cnt = S_LONG.pack(i * 0x4000 + j)
h.update(seed)
h.update(cnt[:3])
if j == 0:
iv += h.digest()[19:20]
key_be = h.digest()[:16]
key_le = pack("<LLLL", *unpack(">LLLL", key_be))
return key_le, iv
def rar3_decompress(vers, meth, data, declen=0, flags=0, crc=0, psw=None, salt=None):
"""Decompress blob of compressed data.
Used for data with non-standard header - eg. comments.
"""
# already uncompressed?
if meth == RAR_M0 and (flags & RAR_FILE_PASSWORD) == 0:
return data
# take only necessary flags
flags = flags & (RAR_FILE_PASSWORD | RAR_FILE_SALT | RAR_FILE_DICTMASK)
flags |= RAR_LONG_BLOCK
# file header
fname = b'data'
date = 0
mode = 0x20
fhdr = S_FILE_HDR.pack(len(data), declen, RAR_OS_MSDOS, crc,
date, vers, meth, len(fname), mode)
fhdr += fname
if flags & RAR_FILE_SALT:
if not salt:
return EMPTY
fhdr += salt
# full header
hlen = S_BLK_HDR.size + len(fhdr)
hdr = S_BLK_HDR.pack(0, RAR_BLOCK_FILE, flags, hlen) + fhdr
hcrc = rar_crc32(hdr[2:]) & 0xFFFF
hdr = S_BLK_HDR.pack(hcrc, RAR_BLOCK_FILE, flags, hlen) + fhdr
# archive main header
mh = S_BLK_HDR.pack(0x90CF, RAR_BLOCK_MAIN, 0, 13) + ZERO * (2 + 4)
# decompress via temp rar
tmpfd, tmpname = mkstemp(suffix='.rar')
tmpf = os.fdopen(tmpfd, "wb")
try:
tmpf.write(RAR_ID + mh + hdr + data)
tmpf.close()
cmd = [UNRAR_TOOL] + list(OPEN_ARGS)
add_password_arg(cmd, psw, (flags & RAR_FILE_PASSWORD))
cmd.append(tmpname)
p = custom_popen(cmd)
return p.communicate()[0]
finally:
tmpf.close()
os.unlink(tmpname)
def to_datetime(t):
"""Convert 6-part time tuple into datetime object.
"""
if t is None:
return None
# extract values
year, mon, day, h, m, s = t
# assume the values are valid
try:
return datetime(year, mon, day, h, m, s)
except ValueError:
pass
# sanitize invalid values
mday = (0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
if mon < 1:
mon = 1
if mon > 12:
mon = 12
if day < 1:
day = 1
if day > mday[mon]:
day = mday[mon]
if h > 23:
h = 23
if m > 59:
m = 59
if s > 59:
s = 59
if mon == 2 and day == 29:
try:
return datetime(year, mon, day, h, m, s)
except ValueError:
day = 28
return datetime(year, mon, day, h, m, s)
def parse_dos_time(stamp):
"""Parse standard 32-bit DOS timestamp.
"""
sec, stamp = stamp & 0x1F, stamp >> 5
mn, stamp = stamp & 0x3F, stamp >> 6
hr, stamp = stamp & 0x1F, stamp >> 5
day, stamp = stamp & 0x1F, stamp >> 5
mon, stamp = stamp & 0x0F, stamp >> 4
yr = (stamp & 0x7F) + 1980
return (yr, mon, day, hr, mn, sec * 2)
def custom_popen(cmd):
"""Disconnect cmd from parent fds, read only from stdout.
"""
# needed for py2exe
creationflags = 0
if sys.platform == 'win32':
creationflags = 0x08000000 # CREATE_NO_WINDOW
# run command
try:
p = Popen(cmd, bufsize=0, stdout=PIPE, stdin=PIPE, stderr=STDOUT,
creationflags=creationflags)
except OSError as ex:
if ex.errno == errno.ENOENT:
raise RarCannotExec("Unrar not installed? (rarfile.UNRAR_TOOL=%r)" % UNRAR_TOOL)
if ex.errno == errno.EACCES or ex.errno == errno.EPERM:
raise RarCannotExec("Cannot execute unrar (rarfile.UNRAR_TOOL=%r)" % UNRAR_TOOL)
raise
return p
def custom_check(cmd, ignore_retcode=False):
"""Run command, collect output, raise error if needed.
"""
p = custom_popen(cmd)
out, _ = p.communicate()
if p.returncode and not ignore_retcode:
raise RarExecError("Check-run failed")
return out
def add_password_arg(cmd, psw, ___required=False):
"""Append password switch to commandline.
"""
if UNRAR_TOOL == ALT_TOOL:
return
if psw is not None:
cmd.append('-p' + psw)
else:
cmd.append('-p-')
def check_returncode(p, out):
"""Raise exception according to unrar exit code.
"""
code = p.returncode
if code == 0:
return
# map return code to exception class, codes from rar.txt
errmap = [None,
RarWarning, RarFatalError, RarCRCError, RarLockedArchiveError, # 1..4
RarWriteError, RarOpenError, RarUserError, RarMemoryError, # 5..8
RarCreateError, RarNoFilesError, RarWrongPassword] # 9..11
if UNRAR_TOOL == ALT_TOOL:
errmap = [None]
if code > 0 and code < len(errmap):
exc = errmap[code]
elif code == 255:
exc = RarUserBreak
elif code < 0:
exc = RarSignalExit
else:
exc = RarUnknownError
# format message
if out:
msg = "%s [%d]: %s" % (exc.__doc__, p.returncode, out)
else:
msg = "%s [%d]" % (exc.__doc__, p.returncode)
raise exc(msg)
def hmac_sha256(key, data):
"""HMAC-SHA256"""
return HMAC(key, data, sha256).digest()
def membuf_tempfile(memfile):
"""Write in-memory file object to real file."""
memfile.seek(0, 0)
tmpfd, tmpname = mkstemp(suffix='.rar')
tmpf = os.fdopen(tmpfd, "wb")
try:
while True:
buf = memfile.read(BSIZE)
if not buf:
break
tmpf.write(buf)
tmpf.close()
except:
tmpf.close()
os.unlink(tmpname)
raise
return tmpname
class XTempFile(object):
"""Real file for archive.
"""
__slots__ = ('_tmpfile', '_filename')
def __init__(self, rarfile):
if is_filelike(rarfile):
self._tmpfile = membuf_tempfile(rarfile)
self._filename = self._tmpfile
else:
self._tmpfile = None
self._filename = rarfile
def __enter__(self):
return self._filename
def __exit__(self, exc_type, exc_value, tb):
if self._tmpfile:
try:
os.unlink(self._tmpfile)
except OSError:
pass
self._tmpfile = None
#
# Check if unrar works
#
ORIG_UNRAR_TOOL = UNRAR_TOOL
ORIG_OPEN_ARGS = OPEN_ARGS
ORIG_EXTRACT_ARGS = EXTRACT_ARGS
ORIG_TEST_ARGS = TEST_ARGS
def _check_unrar_tool():
global UNRAR_TOOL, OPEN_ARGS, EXTRACT_ARGS, TEST_ARGS
try:
# does UNRAR_TOOL work?
custom_check([ORIG_UNRAR_TOOL], True)
UNRAR_TOOL = ORIG_UNRAR_TOOL
OPEN_ARGS = ORIG_OPEN_ARGS
EXTRACT_ARGS = ORIG_EXTRACT_ARGS
TEST_ARGS = ORIG_TEST_ARGS
except RarCannotExec:
try:
# does ALT_TOOL work?
custom_check([ALT_TOOL] + list(ALT_CHECK_ARGS), True)
# replace config
UNRAR_TOOL = ALT_TOOL
OPEN_ARGS = ALT_OPEN_ARGS
EXTRACT_ARGS = ALT_EXTRACT_ARGS
TEST_ARGS = ALT_TEST_ARGS
except RarCannotExec:
# no usable tool, only uncompressed archives work
return False
return True
_check_unrar_tool()
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