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(in-package #:org.shirakumo.file-attributes)
(defconstant CP-UTF8 65001)
(defconstant GENERIC-READ #x80000000)
(defconstant GENERIC-WRITE #x40000000)
(defconstant FILE-SHARE-ALL #x00000007)
(defconstant OPEN-EXISTING 3)
(defconstant FILE-ATTRIBUTE-NORMAL #x80)
(defconstant FILE-OBJECT #x1)
(defconstant OWNER-SECURITY-INFORMATION #x1)
(defconstant GROUP-SECURITY-INFORMATION #x2)
(cffi:defctype hfile :int)
(cffi:defctype byte :uint8)
(cffi:defctype word :uint16)
(cffi:defctype dword :uint32)
(cffi:defcstruct (filetime :conc-name filetime-)
(low-date-time dword)
(high-date-time dword))
(cffi:defcstruct (systemtime :conc-name systemtime-)
(year word)
(month word)
(day-of-week word)
(day word)
(hour word)
(minute word)
(second word)
(milliseconds word))
(cffi:defcstruct (sid :conc-name sid-)
(revision byte)
(authority-count byte)
(identifier byte :count 6)
(sub-authority dword))
(cffi:defcfun (filetime-to-systemtime "FileTimeToSystemTime") :bool
(filetime :pointer)
(systemtime :pointer))
(cffi:defcfun (systemtime-to-filetime "SystemTimeToFileTime") :bool
(systemtime :pointer)
(filetime :pointer))
(cffi:defcfun (get-file-time "GetFileTime") :bool
(file hfile)
(ctime :pointer)
(atime :pointer)
(mtime :pointer))
(cffi:defcfun (set-file-time "SetFileTime") :bool
(file hfile)
(ctime :pointer)
(atime :pointer)
(mtime :pointer))
(cffi:defcfun (create-file "CreateFileW") hfile
(filename :pointer)
(access dword)
(share-mode dword)
(security-attributes :pointer)
(creation-disposition dword)
(flags-and-attributes dword)
(template hfile))
(cffi:defcfun (allocate-sid "AllocateAndInitializeSid") :bool
(authority :pointer)
(sub-authorities byte)
(authority-0 dword)
(authority-1 dword)
(authority-2 dword)
(authority-3 dword)
(authority-4 dword)
(authority-5 dword)
(authority-6 dword)
(authority-7 dword)
(sid :pointer))
(cffi:defcfun (get-security-info "GetSecurityInfo") dword
(handle hfile)
(object-type :int)
(security-info :int)
(owner :pointer)
(group :pointer)
(dacl :pointer)
(sacl :pointer)
(security-descriptor :pointer))
(cffi:defcfun (set-security-info "SetSecurityInfo") dword
(handle hfile)
(object-type :int)
(security-info :int)
(owner :pointer)
(group :pointer)
(dacl :pointer)
(sacl :pointer))
(cffi:defcfun (close-file "CloseHandle") :bool
(object hfile))
(cffi:defcfun (local-free "LocalFree") :pointer
(object :pointer))
(cffi:defcfun (get-file-attributes "GetFileAttributesW") dword
(filename :pointer))
(cffi:defcfun (set-file-attributes "SetFileAttributesW") :bool
(filename :pointer)
(attributes dword))
(cffi:defcfun (wide-char-to-multi-byte "WideCharToMultiByte") :int
(code-page :uint)
(flags dword)
(wide-char-str :pointer)
(wide-char :int)
(multi-byte-str :pointer)
(multi-byte :int)
(default-char :pointer)
(used-default-char :pointer))
(cffi:defcfun (multi-byte-to-wide-char "MultiByteToWideChar") :int
(code-page :uint)
(flags dword)
(multi-byte-str :pointer)
(multi-byte :int)
(wide-char-str :pointer)
(wide-char :int))
(defun wstring->string (pointer &optional (chars -1))
(let ((bytes (wide-char-to-multi-byte CP-UTF8 0 pointer chars (cffi:null-pointer) 0 (cffi:null-pointer) (cffi:null-pointer))))
(cffi:with-foreign-object (string :uchar bytes)
(wide-char-to-multi-byte CP-UTF8 0 pointer chars string bytes (cffi:null-pointer) (cffi:null-pointer))
(cffi:foreign-string-to-lisp string :encoding :utf-8))))
(defun string->wstring (string)
(cffi:with-foreign-string (string string)
(let* ((chars (multi-byte-to-wide-char CP-UTF8 0 string -1 (cffi:null-pointer) 0))
(pointer (cffi:foreign-alloc :uint16 :count chars)))
(multi-byte-to-wide-char CP-UTF8 0 string -1 pointer chars)
pointer)))
(defun open-file (path mode)
(let ((string (string->wstring (enpath path))))
(unwind-protect
(let ((handle (create-file string mode FILE-SHARE-ALL (cffi:null-pointer)
OPEN-EXISTING FILE-ATTRIBUTE-NORMAL 0)))
(if (/= -1 handle)
handle
(error "CreateFile failed.")))
(cffi:foreign-free string))))
(defmacro with-file ((file path mode) &body body)
`(let ((,file (open-file ,path ,mode)))
(unwind-protect (progn ,@body)
(close-file ,file))))
(defun filetime->universal (filetime)
(cffi:with-foreign-object (systemtime '(:struct systemtime))
(if (filetime-to-systemtime filetime systemtime)
(encode-universal-time
(systemtime-second systemtime)
(systemtime-minute systemtime)
(systemtime-hour systemtime)
(systemtime-day systemtime)
(systemtime-month systemtime)
(systemtime-year systemtime) 0)
(error "Failed to convert filetime."))))
(defun universal->filetime (universal filetime)
(cffi:with-foreign-object (systemtime '(:struct systemtime))
(multiple-value-bind (s m h dd mm yy) (decode-universal-time universal 0)
(setf (systemtime-second systemtime) s)
(setf (systemtime-minute systemtime) m)
(setf (systemtime-hour systemtime) h)
(setf (systemtime-day systemtime) dd)
(setf (systemtime-month systemtime) mm)
(setf (systemtime-year systemtime) yy))
(if (systemtime-to-filetime systemtime filetime)
filetime
(error "Failed to convert filetime."))))
(defmacro define-time-reader (name args)
`(define-implementation ,name (file)
(with-file (file file GENERIC-READ)
(cffi:with-foreign-object (filetime '(:struct filetime))
(if (get-file-time file ,@args)
(filetime->universal filetime)
(error "GetFileTime failed."))))))
(defmacro define-time-writer (name args)
`(define-implementation (setf ,name) (value file)
(with-file (file file GENERIC-WRITE)
(cffi:with-foreign-object (filetime '(:struct filetime))
(universal->filetime value filetime)
(if (set-file-time file ,@args)
value
(error "SetFileTime failed."))))))
(define-time-reader access-time ((cffi:null-pointer) filetime (cffi:null-pointer)))
(define-time-writer access-time ((cffi:null-pointer) filetime (cffi:null-pointer)))
(define-time-reader modification-time ((cffi:null-pointer) (cffi:null-pointer) filetime))
(define-time-writer modification-time ((cffi:null-pointer) (cffi:null-pointer) filetime))
(define-time-reader creation-time (filetime (cffi:null-pointer) (cffi:null-pointer)))
(define-time-writer creation-time (filetime (cffi:null-pointer) (cffi:null-pointer)))
(define-implementation user (file)
(with-file (file file GENERIC-READ)
(cffi:with-foreign-objects ((user '(:struct sid))
(attribs :pointer))
(cond ((= 0 (get-security-info file FILE-OBJECT OWNER-SECURITY-INFORMATION user (cffi:null-pointer)
(cffi:null-pointer) (cffi:null-pointer) attribs))
(local-free (cffi:mem-ref attribs :pointer))
(sid-sub-authority user))
(T
(error "GetSecurityInfo failed."))))))
(define-implementation (setf user) (user file)
(with-file (file file GENERIC-WRITE)
(cffi:with-foreign-objects ((user '(:struct sid))
(authority byte 6))
(setf (cffi:mem-aref authority 'byte 6) 5)
(unless (allocate-sid authority 1 user 0 0 0 0 0 0 0 user)
(error "AllocateAndInitializeSid failed."))
(unless (= 0 (set-security-info file FILE-OBJECT USER-SECURITY-INFORMATION user (cffi:null-pointer)
(cffi:null-pointer) (cffi:null-pointer)))
(error "SetSecurityInfo failed."))
user)))
(define-implementation group (file)
(with-file (file file GENERIC-READ)
(cffi:with-foreign-objects ((group '(:struct sid))
(attribs :pointer))
(cond ((= 0 (get-security-info file FILE-OBJECT GROUP-SECURITY-INFORMATION (cffi:null-pointer) group
(cffi:null-pointer) (cffi:null-pointer) attribs))
(local-free (cffi:mem-ref attribs :pointer))
(sid-sub-authority group))
(T
(error "GetSecurityInfo failed."))))))
(define-implementation (setf group) (group file)
(with-file (file file GENERIC-WRITE)
(cffi:with-foreign-objects ((group '(:struct sid))
(authority byte 6))
(setf (cffi:mem-aref authority 'byte 6) 5)
(unless (allocate-sid authority 1 group 0 0 0 0 0 0 0 group)
(error "AllocateAndInitializeSid failed."))
(unless (= 0 (set-security-info file FILE-OBJECT GROUP-SECURITY-INFORMATION (cffi:null-pointer) group
(cffi:null-pointer) (cffi:null-pointer)))
(error "SetSecurityInfo failed."))
group)))
(define-implementation attributes (file)
(let ((string (string->wstring (enpath file))))
(unwind-protect
(let ((attributes (get-file-attributes string)))
(if (= attributes #xFFFFFFFF)
(error "GetFileAttributes failed.")
attributes))
(cffi:foreign-free string))))
(define-implementation (setf attributes) (value file)
(let ((string (string->wstring (enpath file))))
(unwind-protect
(if (set-file-attributes string value)
value
(error "SetFileAttributes failed."))
(cffi:foreign-free string))))
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