PHP function unpack

Hi,

I'm new to the list and I've search internet and didn't find an answer
to my problem.

I'm converting a perl script to PHP and I've done almost everything.
The only part of the code that I didn't get working on PHP was:

(PERL CODE)
foreach ($b_length,$b_mac,$b_crlf,$b_crlf,$a_body) {
$d_checksum += unpack("%16n*", $_);
}

The idea is to make a 16-bit checksum of all elements
($b_length,$b_mac,$b_crlf,$b_crlf,$a_body).

I'm tried translating the code to:

$arr_checksum = array($b_length,$b_mac,$b_crlf,$b_crlf,$File_Content);

$d_checksum = 0;
foreach($arr_checksum as $check_elem){
$d_check = unpack("n*", $check_elem);
for ($i=0;$i<4;$i++){
$d_checksum += $d_check["$i"];
}
}

But the result is different. I know that unpack in perl and php are
different, but I cant find a way to translate the format %16n* of perl
to php and generate a 16-bit checksum.

Any help will be appreciated.

[]'s
Gabriel.

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Re: PHP function unpack

Hi,

I've sent this mail a few days ago, but as this list have a very high
traffic maybe my mail disappear from you inbox.

Any help would be appreciated.

Thanks in advance,
Gabriel.

On Sun, Oct 11, 2009 at 4:42 PM, Gabriel Hahmann
wrote:
> Hi,
>
> I'm new to the list and I've search internet and didn't find an answer
> to my problem.
>
> I'm converting a perl script to PHP and I've done almost everything.
> The only part of the code that I didn't get working on PHP was:
>
> (PERL CODE)
> foreach ($b_length,$b_mac,$b_crlf,$b_crlf,$a_body) {
> =A0 =A0 =A0 =A0$d_checksum +=3D unpack("%16n*", $_);
> }
>
> The idea is to make a 16-bit checksum of all elements
> ($b_length,$b_mac,$b_crlf,$b_crlf,$a_body).
>
> I'm tried translating the code to:
>
> $arr_checksum =3D array($b_length,$b_mac,$b_crlf,$b_crlf,$File_Content);
>
> $d_checksum =3D 0;
> foreach($arr_checksum as $check_elem){
> =A0 =A0 =A0 =A0$d_check =3D unpack("n*", $check_elem);
> =A0 =A0 =A0 =A0for ($i=3D0;$i<4;$i++){
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0$d_checksum +=3D $d_check["$i"];
> =A0 =A0 =A0 =A0}
> }
>
> But the result is different. I know that unpack in perl and php are
> different, but I cant find a way to translate the format %16n* of perl
> to php and generate a 16-bit checksum.
>
> Any help will be appreciated.
>
> []'s
> Gabriel.
>

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