Re: [PHP4BETA] bugs and a leak

Okay, so I've got this partially figure out but I'm wondering if there's a better way. So fread returns a binary string, what's the best way to do a comparison on this? For my case here i can do an ord() on $one and $two thus making it an integer and the & and comparison then work. But what about for a larger value? Would I have to loop through and call ord() on each byte? > 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!