123 lines
3.7 KiB
Python
123 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2014 Thomas Amland <thomas.amland@gmail.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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:module: watchdog.utils.win32stat
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:synopsis: Implementation of stat with st_ino and st_dev support.
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Functions
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---------
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.. autofunction:: stat
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"""
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import ctypes
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import ctypes.wintypes
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import stat as stdstat
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from collections import namedtuple
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INVALID_HANDLE_VALUE = ctypes.c_void_p(-1).value
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OPEN_EXISTING = 3
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FILE_READ_ATTRIBUTES = 0x80
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FILE_ATTRIBUTE_NORMAL = 0x80
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FILE_ATTRIBUTE_READONLY = 0x1
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FILE_ATTRIBUTE_DIRECTORY = 0x10
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FILE_FLAG_BACKUP_SEMANTICS = 0x02000000
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FILE_FLAG_OPEN_REPARSE_POINT = 0x00200000
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class FILETIME(ctypes.Structure):
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_fields_ = [("dwLowDateTime", ctypes.wintypes.DWORD),
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("dwHighDateTime", ctypes.wintypes.DWORD)]
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class BY_HANDLE_FILE_INFORMATION(ctypes.Structure):
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_fields_ = [('dwFileAttributes', ctypes.wintypes.DWORD),
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('ftCreationTime', FILETIME),
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('ftLastAccessTime', FILETIME),
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('ftLastWriteTime', FILETIME),
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('dwVolumeSerialNumber', ctypes.wintypes.DWORD),
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('nFileSizeHigh', ctypes.wintypes.DWORD),
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('nFileSizeLow', ctypes.wintypes.DWORD),
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('nNumberOfLinks', ctypes.wintypes.DWORD),
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('nFileIndexHigh', ctypes.wintypes.DWORD),
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('nFileIndexLow', ctypes.wintypes.DWORD)]
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CreateFile = ctypes.windll.kernel32.CreateFileW
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CreateFile.restype = ctypes.wintypes.HANDLE
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CreateFile.argtypes = (
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ctypes.c_wchar_p,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.c_void_p,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.DWORD,
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ctypes.wintypes.HANDLE,
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)
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GetFileInformationByHandle = ctypes.windll.kernel32.GetFileInformationByHandle
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GetFileInformationByHandle.restype = ctypes.wintypes.BOOL
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GetFileInformationByHandle.argtypes = (
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ctypes.wintypes.HANDLE,
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ctypes.wintypes.POINTER(BY_HANDLE_FILE_INFORMATION),
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)
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CloseHandle = ctypes.windll.kernel32.CloseHandle
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CloseHandle.restype = ctypes.wintypes.BOOL
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CloseHandle.argtypes = (ctypes.wintypes.HANDLE,)
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StatResult = namedtuple('StatResult', 'st_dev st_ino st_mode st_mtime')
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def _to_mode(attr):
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m = 0
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if (attr & FILE_ATTRIBUTE_DIRECTORY):
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m |= stdstat.S_IFDIR | 0o111
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else:
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m |= stdstat.S_IFREG
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if (attr & FILE_ATTRIBUTE_READONLY):
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m |= 0o444
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else:
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m |= 0o666
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return m
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def _to_unix_time(ft):
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t = (ft.dwHighDateTime) << 32 | ft.dwLowDateTime
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return (t / 10000000) - 11644473600
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def stat(path):
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hfile = CreateFile(path,
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FILE_READ_ATTRIBUTES,
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0,
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None,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
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None)
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if hfile == INVALID_HANDLE_VALUE:
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raise ctypes.WinError()
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info = BY_HANDLE_FILE_INFORMATION()
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r = GetFileInformationByHandle(hfile, info)
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CloseHandle(hfile)
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if not r:
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raise ctypes.WinError()
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return StatResult(st_dev=info.dwVolumeSerialNumber,
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st_ino=(info.nFileIndexHigh << 32) + info.nFileIndexLow,
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st_mode=_to_mode(info.dwFileAttributes),
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st_mtime=_to_unix_time(info.ftLastWriteTime)
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)
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