Re: [PHP4BETA] bugs and a leak

> I think you are confusing fread() and fseek() here. Sorry, yes, fseek is what I mean, more specifically seeking from the end. Is there any way to do SEEK_END here? I suppose you could open it in append mode and then do -128, but I can't assume the files will have write permissions. Doing a filesize and subtracting 128 would require two file system accesses, correct (one for fopen, one for filesize)? Is there a better way to do this I'm missing? > I am not sure I am explaining this very well. How about an example: > > $a = 255; > $b = 0xff; > if($a==$b) echo "They are equal"; > > This prints "They are equal"; Here is my example. I have a file whose first two bytes are 0xff and 0xfb. Here is the script: $file = "test"; $fp = fopen($file, "r"); $one = fread($fp, 1); $two = fread($fp, 1); $two &= 0xf0; if ($one == 0xff && $two == 0xf0) { echo "Got it"; } else { echo "Invalid file"; } This outputs "Invalid file", which it should not as the first byte is 0xff and the second byte 0xfb & 0xf0 should be 0xf0. If I echo out $one, it is a y with an umlaut over it. If I echo out dechex($one) it is 0. If I echo out bin2hex($one), it is ff. If I try $one == 255, it is false as is $one == 0xff. So yes, I am confused as to how $one is represented and how I should check this. Based on what you have said, the above *should* work. What I am trying to do is the equivalent of this in C #include <stdio.h> #include <unistd.h> #include <stdlib.h> int main() { FILE *fp; unsigned char tmp[2]; fp = fopen("test", "r"); fread(tmp, sizeof(tmp), 1, fp); tmp[1] &= 0xf0; if (tmp[0] == 0xff && tmp[1] == 0xf0) { printf("It's good!"); } else { printf("Invalid file"); } fclose(fp); } It seems to me the above php code is a direct translation of this working C code, so I must be misunderstanding something about the differences between C and php here... -- Chad Cunningham ccunning@math.ohio-state.edu Only 159 days until RSA Patent expiration!