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windows-xp/Source/XPSP1/NT/base/win32/client/tfile.c

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/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
tfile.c
Abstract:
Test program for Win32 Base File API calls
Author:
Mark Lucovsky (markl) 26-Sep-1990
Revision History:
--*/
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <assert.h>
#include <stdio.h>
#include <windows.h>
#include <string.h>
#include <memory.h>
#define xassert ASSERT
DWORD
main(
int argc,
char *argv[],
char *envp[]
)
{
HANDLE iFile,oFile,fFile,mFile,n1,o1;
DWORD n,n2;
LONG Size;
BYTE buff[512],cbuff[512];
DWORD attr;
FILETIME Mtime, Mtime0, Mtime1;
PWIN32_FIND_DATA FindFileData;
BOOL b;
WORD w1,w2;
DWORD dw,spc,bps,fc,tc;
LPSTR base;
LPSTR l;
OFSTRUCT reopen1, reopen2;
DWORD volsn[2];
printf("Drives = 0x%lx\n",GetLogicalDrives());
n = GetLogicalDriveStrings(511,buff);
if ( n < 512 ) {
l = buff;
while ( *l ) {
printf("%s\n",l);
n2 = strlen(l);
l += (n2+1);;
}
}
n = GetLogicalDriveStringsW(511,buff);
xassert(!SetCurrentDirectory("X:\\"));
FindFileData = (PWIN32_FIND_DATA)buff;
fFile = FindFirstFile(
"e:\\nt\\dll\\nul",
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
FindClose(fFile);
FindFileData = (PWIN32_FIND_DATA)buff;
fFile = FindFirstFile(
"e:\\",
FindFileData
);
xassert(fFile == INVALID_HANDLE_VALUE);
b = GetVolumeInformation("",NULL,0,volsn,NULL,NULL,NULL,0);
assert(!b);
b = GetVolumeInformation("e:\\",NULL,0,volsn,NULL,NULL,NULL,0);
assert(b);
w2 = GetTempFileName("e:\\zzzxtmp","zz",0,buff);
xassert(w2 == 0 );
b = GetDiskFreeSpace(NULL,&spc,&bps,&fc,&tc);
xassert(b && spc && (bps == 512) && fc && tc);
printf("SPC = %d, BPS = %d, FC = %d, TC = %d\n",spc,bps,fc,tc);
SearchPath(
".;e:\\nt;e:\\nt\\dll",
"base",
".dll",
512,
cbuff,
NULL
);
SearchPath(
NULL,
"win386.exe",
".EXe",
512,
cbuff,
NULL
);
(VOID)argc;
(VOID)argv;
(VOID)envp;
#if 0
CreateDirectory("e:\\zyx",NULL);
xassert(SetCurrentDirectory("e:\\zyx"));
*buff = '\0';
xassert(GetTempPath(8,buff) == 7 && !_strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(7,buff) == 7 && !_strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(6,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(5,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(4,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(3,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(2,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(1,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
*buff = '\0';
xassert(GetTempPath(0,buff) == 7 && _strcmpi(buff,"e:\\zyx\\") );
#endif
xassert(SetCurrentDirectory("e:\\nt"));
b = SetEnvironmentVariable("TMP","d:\\tmp");
xassert(b);
#if 0
*buff = '\0';
xassert(GetTempPath(8,buff) == 7 && !_strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(7,buff) == 7 && !_strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(6,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(5,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(4,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(3,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(2,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(1,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(0,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
#endif
b = SetEnvironmentVariable("TMP","d:\\tmp\\");
xassert(b);
#if 0
*buff = '\0';
xassert(GetTempPath(8,buff) == 7 && !_strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(7,buff) == 7 && !_strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(6,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(5,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(4,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(3,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(2,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(1,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
*buff = '\0';
xassert(GetTempPath(0,buff) == 7 && _strcmpi(buff,"d:\\tmp\\") );
#endif
w1 = GetTempFileName("e:\\tmp\\","foo",0,buff);
iFile = CreateFile(
buff,
GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(iFile != INVALID_HANDLE_VALUE);
w2 = GetTempFileName("e:\\tmp","foobar",w1,buff);
xassert(w1 == w2);
oFile = CreateFile(
buff,
GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(oFile == INVALID_HANDLE_VALUE);
CloseHandle(iFile);
xassert(CopyFile("e:\\nt\\dll\\usersrv.dll",buff,FALSE));
DeleteFile("xyzzy");
xassert(MoveFile(buff,"xyzzy"));
xassert(!DeleteFile(buff));
DeleteFile("rrxyzzy");
xassert(MoveFile("xyzzy","rrxyzzy"));
oFile = CreateFile(
"rrxyzzy",
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(oFile != INVALID_HANDLE_VALUE);
iFile = CreateFile(
"e:\\nt\\dll\\usersrv.dll",
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(iFile != INVALID_HANDLE_VALUE);
fFile = CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,8192,NULL);
xassert(fFile);
base = MapViewOfFile(fFile,FILE_MAP_WRITE,0,0,0);
xassert(base);
strcpy(base,"Hello World\n");
printf("%s",base);
xassert(UnmapViewOfFile(base));
CloseHandle(fFile);
fFile = CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READONLY,0,8192,NULL);
xassert(fFile);
CloseHandle(fFile);
fFile = CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READONLY,0,0,NULL);
xassert(!fFile);
mFile = CreateFileMapping(oFile,NULL,PAGE_READONLY,0,0,NULL);
xassert(mFile);
n1 = CreateFileMapping(oFile,NULL,PAGE_READONLY,0,0,"named-map");
xassert(n1);
o1 = OpenFileMapping(FILE_MAP_WRITE,FALSE,"named-map");
xassert(o1);
base = MapViewOfFile(o1,FILE_MAP_WRITE,0,0,0);
xassert(!base);
base = MapViewOfFile(n1,FILE_MAP_READ,0,0,0);
xassert(base);
FindFileData = (PWIN32_FIND_DATA)buff;
fFile = FindFirstFile(
"e:\\nt\\dll\\usersrv.dll",
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
l = LocalAlloc(LMEM_ZEROINIT,FindFileData->nFileSizeLow);
xassert(l);
b = ReadFile(iFile,l,FindFileData->nFileSizeLow,&n,NULL);
xassert(b);
xassert(n == FindFileData->nFileSizeLow);
CloseHandle(oFile);
xassert(memcmp(l,base,FindFileData->nFileSizeLow) == 0 );
xassert(DeleteFile("rrxyzzy"));
w2 = GetTempFileName("e:\\tmp","foobar",(WORD)0xf7ff,buff);
xassert(w2 == 0xf7ff);
oFile = CreateFile(
buff,
GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(oFile == INVALID_HANDLE_VALUE);
w2 = GetTempFileName("e:\\xtmp","foobar",0,buff);
xassert(w2 == 0);
xassert(!RemoveDirectory("e:\\"));
xassert(SetCurrentDirectory("e:\\nt"));
xassert(!RemoveDirectory("."));
n = GetCurrentDirectory(0,buff);
xassert(n == 5);
n = GetCurrentDirectory(4,buff);
xassert(n == 5);
*buff = '\0';
n = GetCurrentDirectory(5,buff);
xassert(n == 5 && strcmp(buff,"e:\\nt") == 0 );
*buff = '\0';
n = GetCurrentDirectory(500,buff);
xassert(n == 5 && strcmp(buff,"e:\\nt") == 0 );
xassert(SetCurrentDirectory("e:\\"));
*buff = '\0';
n = GetCurrentDirectory(500,buff);
xassert(n == 3 && strcmp(buff,"e:\\") == 0 );
*buff = '\0';
n = GetCurrentDirectory(3,buff);
xassert(n == 3 && strcmp(buff,"e:\\") == 0 );
*buff = '\0';
n = GetCurrentDirectory(2,buff);
xassert(n == 3 && strcmp(buff,"e:\\") != 0 );
xassert(SetCurrentDirectory("e:\\nt"));
*buff = '\0';
n = GetCurrentDirectory(500,buff);
xassert(n == 5 && strcmp(buff,"e:\\nt") == 0 );
xassert(SetCurrentDirectory("."));
*buff = '\0';
n = GetCurrentDirectory(500,buff);
xassert(n == 5 && strcmp(buff,"e:\\nt") == 0 );
xassert(GetDriveType("Z:\\") == 1);
xassert(GetDriveType(".") == 1);
xassert(GetDriveType("e:\\NT") == 1);
xassert(GetDriveType(NULL) == DRIVE_FIXED);
xassert(GetDriveType("e:\\") == DRIVE_FIXED);
xassert(GetDriveType("A:\\") == DRIVE_REMOVABLE);
xassert(!CreateDirectory(".",NULL));
xassert(CreateDirectory("xyzzy",NULL));
FindFileData = (PWIN32_FIND_DATA)buff;
fFile = FindFirstFile(
"xyzzy\\*.*",
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
b = TRUE;
while(b) {
printf("0x%08x %08d %s\n",
FindFileData->dwFileAttributes,
FindFileData->nFileSizeLow,
FindFileData->cFileName
);
b = FindNextFile(fFile,FindFileData);
}
FindClose(fFile);
xassert(!FindClose(fFile));
xassert(RemoveDirectory("xyzzy"));
iFile = CreateFile(
"",
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(iFile == INVALID_HANDLE_VALUE);
iFile = CreateFile(
"nt.cfg",
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(iFile != INVALID_HANDLE_VALUE);
xassert(!FlushFileBuffers(iFile));
xassert(LockFile(iFile,0,0,10,0));
xassert(LockFile(iFile,10,0,10,0));
xassert(!LockFile(iFile,1,0,1,0));
xassert(!LockFile(iFile,0,0,11,0));
xassert(!LockFile(iFile,0,0,20,0));
xassert(!UnlockFile(iFile,1,0,1,0));
xassert(!UnlockFile(iFile,0,0,11,0));
xassert(!UnlockFile(iFile,0,0,20,0));
xassert(UnlockFile(iFile,0,0,10,0));
xassert(UnlockFile(iFile,10,0,10,0));
xassert(LockFile(iFile,0,0,10,0));
xassert(LockFile(iFile,10,0,10,0));
fFile = CreateFile(
"nt.cfg",
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(fFile != INVALID_HANDLE_VALUE);
b = ReadFile(fFile,&buff,1, &n, NULL);
xassert(!b);
xassert(SetFilePointer(INVALID_HANDLE_VALUE,0,NULL,FILE_BEGIN) == 0xffffffff);
b = ReadFile(fFile,&buff,11, &n, NULL);
xassert(SetFilePointer(fFile,0,NULL,FILE_BEGIN) == 0);
b = ReadFile(fFile,&buff,11, &n, NULL);
xassert(!b);
xassert(SetFilePointer(fFile,10,NULL,FILE_BEGIN) == 10);
b = ReadFile(fFile,&buff,1,&n,NULL);
xassert(!b);
xassert(SetFilePointer(fFile,10,NULL,FILE_BEGIN) == 10);
b = ReadFile(fFile,&buff,1,&n,NULL);
xassert(!b);
xassert(SetFilePointer(fFile,20,NULL,FILE_BEGIN) == 20);
b = ReadFile(fFile,&buff,1, &n, NULL);
xassert(b && n == 1);
xassert(UnlockFile(iFile,0,0,10,0));
xassert(UnlockFile(iFile,10,0,10,0));
CloseHandle(fFile);
SetHandleCount(255);
oFile = CreateFile(
"ntos3.cfg",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_HIDDEN,
NULL
);
xassert(oFile != INVALID_HANDLE_VALUE);
xassert(FlushFileBuffers(oFile));
//
// Copy iFile to oFile
//
Size = 0;
b = ReadFile(iFile,&buff,512, &n, NULL);
while(b && n){
Size += n;
b = WriteFile(oFile,&buff,n, &n, NULL);
xassert(b && n);
b = ReadFile(iFile,&buff,512, &n, NULL);
}
//
// Make sure that we can not truncate a read only file
//
xassert(!SetEndOfFile(iFile));
//
// Go back to beginning of the iFile
//
xassert(SetFilePointer(iFile,0,NULL,FILE_BEGIN) == 0);
xassert(SetFilePointer(oFile,-Size,NULL,FILE_CURRENT) == 0);
b = ReadFile(iFile,&buff,512, &n, NULL);
xassert(b && n);
b = ReadFile(oFile,&cbuff,n, &n2, NULL);
xassert(b && (n2 == n) );
while(n && (n == n2) ){
xassert(memcmp(&buff,&cbuff,n) == 0);
ReadFile(iFile,&buff,512, &n, NULL);
ReadFile(oFile,&cbuff,n, &n2, NULL);
xassert(n2 == n);
}
printf("End of Loop. n2 = %ld GLE = 0x%lx\n",n2,GetLastError());
//
// Truncate the file to 128 bytes
//
xassert(SetFilePointer(oFile,128,NULL,FILE_BEGIN) == 128);
xassert(SetEndOfFile(oFile));
xassert(SetFilePointer(oFile,0,NULL,FILE_BEGIN) == 0);
xassert(SetFilePointer(oFile,0,NULL,FILE_END) != -1);
xassert(SetFilePointer(oFile,0,NULL,FILE_BEGIN) == 0);
ReadFile(oFile,&cbuff,512, &n2, NULL);
xassert(n2 == 128);
CloseHandle(iFile);
CloseHandle(oFile);
oFile = CreateFile(
"ntos3.cfg",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
CREATE_NEW,
FILE_ATTRIBUTE_NORMAL,
NULL
);
xassert(oFile == INVALID_HANDLE_VALUE);
attr = GetFileAttributes("ntos3.cfg");
xassert(attr == (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_ARCHIVE));
xassert(SetFileAttributes("ntos3.cfg", FILE_ATTRIBUTE_NORMAL));
attr = GetFileAttributes("ntos3.cfg");
xassert(attr == FILE_ATTRIBUTE_NORMAL);
oFile = CreateFile(
"ntos3.cfg",
GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(oFile != INVALID_HANDLE_VALUE);
xassert(!DeleteFile("ntos3.cfg"));
CloseHandle(oFile);
xassert(DeleteFile("ntos3.cfg"));
oFile = CreateFile(
"ntos3.cfg",
GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL
);
xassert(oFile == INVALID_HANDLE_VALUE);
FindFileData = (PWIN32_FIND_DATA)buff;
fFile = FindFirstFile(
"dll\\*.*",
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
b = TRUE;
while(b) {
printf("0x%08x %08d %s\n",
FindFileData->dwFileAttributes,
FindFileData->nFileSizeLow,
FindFileData->cFileName
);
b = FindNextFile(fFile,FindFileData);
}
FindClose(fFile);
xassert(!FindClose(fFile));
n = GetWindowsDirectory(cbuff,512);
printf("Windows directory %s length %d\n",cbuff,n);
strcat(cbuff,"\\*.*");
fFile = FindFirstFile(
cbuff,
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
b = TRUE;
while(b) {
printf("0x%08x %08d %s\n",
FindFileData->dwFileAttributes,
FindFileData->nFileSizeLow,
FindFileData->cFileName
);
b = FindNextFile(fFile,FindFileData);
}
FindClose(fFile);
xassert(!FindClose(fFile));
GetSystemDirectory(cbuff,512);
strcat(cbuff,"\\*.*");
fFile = FindFirstFile(
cbuff,
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
b = TRUE;
while(b) {
printf("0x%08x %08d %s\n",
FindFileData->dwFileAttributes,
FindFileData->nFileSizeLow,
FindFileData->cFileName
);
b = FindNextFile(fFile,FindFileData);
}
FindClose(fFile);
xassert(!FindClose(fFile));
iFile = (HANDLE)OpenFile("xyzzy.ggg",&reopen1, OF_PARSE);
xassert(iFile == 0);
dw = GetFullPathName("xyzzy.ggg",512,buff,&l);
xassert(!_stricmp(buff,&reopen1.szPathName[0]));
iFile = (HANDLE)OpenFile("",&reopen1, OF_READ);
xassert(iFile == INVALID_HANDLE_VALUE);
iFile = (HANDLE)OpenFile("ls.exe",&reopen1, OF_READ);
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
xassert(!_stricmp("e:\\nt\\bin\\ls.exe",&reopen1.szPathName[0]));
CloseHandle(iFile);
reopen2 = reopen1;
iFile = (HANDLE)OpenFile("ls.exe",&reopen1, OF_VERIFY | OF_READ);
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
xassert(!_stricmp("e:\\nt\\bin\\ls.exe",&reopen1.szPathName[0]));
CloseHandle(iFile);
iFile = (HANDLE)OpenFile("",&reopen1, OF_REOPEN | OF_READ);
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
xassert(!_stricmp("e:\\nt\\bin\\ls.exe",&reopen1.szPathName[0]));
CloseHandle(iFile);
iFile = (HANDLE)OpenFile("ls.exe",&reopen2, OF_VERIFY | OF_READ);
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
xassert(!_stricmp("e:\\nt\\bin\\ls.exe",&reopen2.szPathName[0]));
CloseHandle(iFile);
iFile = (HANDLE)OpenFile("ls.exe",&reopen2, OF_EXIST );
xassert(!CloseHandle(iFile));
xassert(CopyFile("e:\\nt\\bin\\ls.exe","xxx.xxx",FALSE));
iFile = (HANDLE)OpenFile("xxx.xxx",&reopen1, OF_EXIST );
xassert(!CloseHandle(iFile));
iFile = (HANDLE)OpenFile("xxx.xxx",&reopen1, OF_READWRITE );
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
Sleep(3000);
b = WriteFile(iFile,"Hello World",12,&n,NULL);
xassert(b && n == 12);
CloseHandle(iFile);
iFile = (HANDLE)OpenFile("xxx.xxx",&reopen1, OF_VERIFY | OF_READ);
xassert(iFile == INVALID_HANDLE_VALUE);
iFile = (HANDLE)OpenFile("xxx.xxx",&reopen1, OF_DELETE );
xassert(!CloseHandle(iFile));
iFile = (HANDLE)OpenFile("xxx.xxx",&reopen1, OF_EXIST );
printf("iFile %lx nErrCode %d\n",iFile,reopen1.nErrCode);
xassert(iFile == INVALID_HANDLE_VALUE && reopen1.nErrCode == ERROR_FILE_NOT_FOUND);
fFile = FindFirstFile(
"e:\\nt\\nt.cfg",
FindFileData
);
xassert(fFile != INVALID_HANDLE_VALUE);
iFile = (HANDLE)OpenFile("e:\\nt\\nt.cfg",&reopen1, OF_READ);
xassert(iFile && iFile != INVALID_HANDLE_VALUE);
n = GetFileSize(iFile,NULL);
xassert(n != -1);
xassert(n==FindFileData->nFileSizeLow);
FindClose(fFile);
CloseHandle(iFile);
xassert(CopyFile("e:\\nt\\bin\\ls.exe","xxx.xxx",FALSE));
iFile = _lopen("xxx.xxx",OF_READ);
xassert(iFile != INVALID_HANDLE_VALUE);
oFile = _lcreat("xxx.zzz",0);
xassert(oFile != INVALID_HANDLE_VALUE);
Size = 0;
b = ReadFile(iFile,&buff,512, &n, NULL);
while(b && n){
Size += n;
b = WriteFile(oFile,&buff,n, &n, NULL);
xassert(b && n);
b = ReadFile(iFile,&buff,512, &n, NULL);
}
CloseHandle(iFile);
CloseHandle(oFile);
iFile = _lopen("xxx.xxx",OF_WRITE);
xassert(iFile != INVALID_HANDLE_VALUE);
CloseHandle(iFile);
iFile = _lopen("xxx.xxx",OF_READ);
b = ReadFile(iFile,&buff,512, &n, NULL);
xassert(b && n == 0 && GetLastError() == 0);
return 1;
}