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Old 04-13-2002, 09:45 AM   #1
tyler_durden
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Registered: May 2001
Posts: 125

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Writing encrytped data to a disk


I am writing a program that writes encrypted data to a file. i am worried that one of the encrypted strings might carry the EOF charachter in it and prematurely end the file. Is there a way i can avoid this? thank you
 
Old 04-13-2002, 05:48 PM   #2
rstrong
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Registered: Apr 2002
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Thumbs up No Problem

The EOF character is only a reading concept for some file input fuctions which return characters one at a time. For instance if you use fgetc and it returns you the EOF character, you might be at the end of the file but you will not know until you check with a call to feof. Reading EOF from a file is not a problem when using functions like fread, it's just another character.

#include <stdio.h>
#include <stdlib.h>

int main()
{
char buff[100] = { '\0' };
FILE *fp;
fp = fopen("blahblah","w");
fprintf(fp,"Hello%c World\n",EOF);
fclose(fp);
fp = fopen("blahblah");
fread(buff,1,100,fp);
printf("%s",buff);
fclose(fp);
}
 
Old 04-17-2002, 11:18 PM   #3
zmedico
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Location: Mission Viejo, California, USA
Distribution: Gentoo
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The filesystem knows where EOF is based on the *length* of the file, not on data inside the file.
 
  


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