EXE has file junk in it
Andrew Evans
ade@greennet.net
Wed Jun 11 14:52:00 GMT 1997
Sergey Okhapkin wrote:
> I just tried my seek test on NTWS 4.0 - resulting file is zero-filled...
I wrote something similar, though it uses stdio rather than UNIX I/O
functions. It produced files with zero-filled empty space on NT 3.51
and NT 4.0 boxes. 3.51 box is the Workstation distribution with the
appropriate registry tweaks to make it run in server mode. 4.0 box
is an unmodified Workstation distribution. Since the
workstation/server kernels are identical save for the registry keys
that determine which mode they run in, I tend to suspect that a
"real" server distribution would produce files with zero-filled empty
space as well.
Here's my test program, compiled on VC++ 4.2:
#include <stdio.h>
#include <stdlib.h>
void main()
{
FILE* fp;
if (! (fp = fopen("c:\\temp\\empty.dat", "wb")))
{
fprintf(stderr, "Can't open file for writing\n");
exit(1);
}
if (fseek(fp, 20971520, SEEK_END)) // create 20MB of empty data
{
fprintf(stderr, "Can't seek past EOF\n");
exit(1);
}
if (! fprintf(fp, "That's all, folks\n"))
{
fprintf(stderr, "Can't write to file\n");
exit(1);
}
fclose(fp);
exit(0);
-
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