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mimic access() behavior on Windows

This commit is contained in:
Vincent Torri 2024-03-19 23:23:15 +01:00 committed by Carsten Haitzler
parent 9e5bb18af1
commit a6915ecfc5
2 changed files with 4 additions and 120 deletions
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123
src/lib/eina/eina_file_win32.c
View File

@ -549,93 +549,6 @@ eina_file_cleanup(Eina_Tmpstr *path)
return result;
}
static Eina_Bool
_eina_file_is_binary(const char *path)
{
HANDLE h;
HANDLE fm;
unsigned char *base;
unsigned char *base_nt;
LARGE_INTEGER sz;
WORD characteristics;
Eina_Bool res;
res = EINA_FALSE;
/*
* we parse the file to check if it is a PE file (EXE or DLL)
* and we finally check whether it's a DLL or not.
* Reference :
* https://docs.microsoft.com/en-us/windows/win32/debug/pe-format
*/
h = CreateFile(path,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (h == INVALID_HANDLE_VALUE)
return EINA_FALSE;
if (!GetFileSizeEx(h, &sz))
goto close_h;
/* a PE file must contain at least the DOS and NT headers */
if (sz.QuadPart < (LONGLONG)(sizeof(IMAGE_DOS_HEADER) + sizeof(IMAGE_NT_HEADERS)))
goto close_h;
fm = CreateFileMapping(h, NULL, PAGE_READONLY, 0, 0, NULL);
if (fm == NULL)
goto close_h;
base = (unsigned char *)MapViewOfFile(fm, FILE_MAP_READ, 0, 0, 0);
CloseHandle(fm);
if (base == NULL)
goto close_h;
/*
* the PE file begins with the DOS header.
* First magic number : the DOS header must begin with a DOS magic
* number, that is "MZ", that is 0x5a4d, stored in a WORD.
*/
if (*((WORD *)base) != 0x5a4d)
goto unmap_view;
/*
* The position of the NT header is located at the offset 0x3c.
*/
base_nt = base + *((DWORD *)(base + 0x3c));
/*
* The NT header begins with the magic number "PE\0\0", that is
* 0x00004550, stored in a DWORD.
*/
if (*((DWORD *)base_nt) != 0x00004550)
goto unmap_view;
/*
* to get informations about executable (EXE or DLL), we look at
* the 'Characteristics' member of the NT header, located at the offset
* 22 (4 for the magic number, 18 for the offset) from base_nt.
* https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#characteristics
*/
characteristics = *((WORD *)(base_nt + 4 + 18));
/*
* 0x0002 : if set, EXE or DLL
* 0x2000 : if set, DLL
*/
res = (characteristics & 0x0002) && !(characteristics & 0x2000);
unmap_view:
UnmapViewOfFile(base);
close_h:
CloseHandle(h);
return res;
}
/*============================================================================*
* API *
*============================================================================*/
@ -1401,42 +1314,14 @@ eina_file_access(const char *path, Eina_File_Access_Mode mode)
if (mode & EINA_FILE_ACCESS_MODE_EXEC)
{
if (attr & FILE_ATTRIBUTE_DIRECTORY)
{
/*
* Some directories have restricted access, like
* c:\Windows\System32\WDI
*/
HANDLE h;
Eina_Bool ret = EINA_FALSE;
h = CreateFile(path,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_ARCHIVE | FILE_FLAG_BACKUP_SEMANTICS,
NULL);
ret = (h == INVALID_HANDLE_VALUE);
CloseHandle(h);
if (ret)
return EINA_FALSE;
}
else
{
/*
* For files, check if it is a binary.
*/
if (!_eina_file_is_binary(path))
return EINA_FALSE;
}
if (!(attr & FILE_ATTRIBUTE_DIRECTORY) &&
!eina_str_has_extension(path, ".exe") &&
!eina_str_has_extension(path, ".bat"))
return EINA_FALSE;
}
if (mode & EINA_FILE_ACCESS_MODE_WRITE)
{
DWORD attr;
attr = GetFileAttributes(path);
if (attr == INVALID_FILE_ATTRIBUTES)
return EINA_FALSE;

1
src/tests/eina/eina_test_file.c
View File

@ -910,7 +910,6 @@ EFL_START_TEST(eina_test_file_access)
#ifdef _WIN32
{ "c:\\Windows", EINA_FILE_ACCESS_MODE_EXIST, EINA_TRUE },
{ "c:\\Windows", EINA_FILE_ACCESS_MODE_EXEC, EINA_TRUE },
{ "c:\\Windows\\System32\\WDI", EINA_FILE_ACCESS_MODE_EXEC, EINA_FALSE },
{ "c:\\Windows\\notepad.exe", EINA_FILE_ACCESS_MODE_EXIST, EINA_TRUE },
{ "c:\\Windows\\notepad.exe", EINA_FILE_ACCESS_MODE_EXEC, EINA_TRUE },
{ "c:\\Windows\\notepad.exe", EINA_FILE_ACCESS_MODE_WRITE, EINA_TRUE },