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# Copyright 2020 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Win32 functions and constants."""
import ctypes
import ctypes.wintypes
GENERIC_WRITE = 0x40000000
CREATE_ALWAYS = 0x00000002
FILE_ATTRIBUTE_NORMAL = 0x00000080
LOCKFILE_EXCLUSIVE_LOCK = 0x00000002
LOCKFILE_FAIL_IMMEDIATELY = 0x00000001
class Overlapped(ctypes.Structure):
"""Overlapped is required and used in LockFileEx and UnlockFileEx."""
_fields_ = [('Internal', ctypes.wintypes.LPVOID),
('InternalHigh', ctypes.wintypes.LPVOID),
('Offset', ctypes.wintypes.DWORD),
('OffsetHigh', ctypes.wintypes.DWORD),
('Pointer', ctypes.wintypes.LPVOID),
('hEvent', ctypes.wintypes.HANDLE)]
# https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew
CreateFileW = ctypes.windll.kernel32.CreateFileW
CreateFileW.argtypes = [
ctypes.wintypes.LPCWSTR, # lpFileName
ctypes.wintypes.DWORD, # dwDesiredAccess
ctypes.wintypes.DWORD, # dwShareMode
ctypes.wintypes.LPVOID, # lpSecurityAttributes
ctypes.wintypes.DWORD, # dwCreationDisposition
ctypes.wintypes.DWORD, # dwFlagsAndAttributes
ctypes.wintypes.LPVOID, # hTemplateFile
]
CreateFileW.restype = ctypes.wintypes.HANDLE
# https://docs.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-closehandle
CloseHandle = ctypes.windll.kernel32.CloseHandle
CloseHandle.argtypes = [
ctypes.wintypes.HANDLE, # hFile
]
CloseHandle.restype = ctypes.wintypes.BOOL
# https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-lockfileex
LockFileEx = ctypes.windll.kernel32.LockFileEx
LockFileEx.argtypes = [
ctypes.wintypes.HANDLE, # hFile
ctypes.wintypes.DWORD, # dwFlags
ctypes.wintypes.DWORD, # dwReserved
ctypes.wintypes.DWORD, # nNumberOfBytesToLockLow
ctypes.wintypes.DWORD, # nNumberOfBytesToLockHigh
ctypes.POINTER(Overlapped), # lpOverlapped
]
LockFileEx.restype = ctypes.wintypes.BOOL
# Commonly used functions are listed here so callers don't need to import
# ctypes.
GetLastError = ctypes.GetLastError
Handle = ctypes.wintypes.HANDLE
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