fread() question

I have an open socket that I am reading from. The code looks like the
following:

$contentLength = 0 + $this->response['headers']['content-length'];

do{
$status = socket_get_status($this->socket);

if( $status['eof'] == 1 ) {
if( $this->clientOptions['debug'] & DBGSOCK ) echo("DBG.SOCK status
eof met, finished socket_read\n");
break;
}

if($status['unread_bytes'] > 0) {

if($contentLength > $status['unread_bytes']) {
echo("DBG.SOCK reading {$status['unread_bytes']} bytes...\n");
$buffer = @fread($this->socket, $status['unread_bytes']);

$contentLength = $contentLength - $status['unread_bytes'];
} else {
$buffer = @fread($this->socket, $contentLength);
$contentLength = 0;
}
} else {
if( $this->clientOptions['debug'] & DBGSOCK ) echo("DBG.SOCK reading
{$status['unread_bytes']} bytes...\n");
usleep(1);
continue;
}

$data .= $buffer;
} while($contentLength > 0);


Now, the above code hangs (infinite loop, actually), ultimately returning
something like:

DBG.SOCK reading 3993 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
DBG.SOCK reading 0 bytes...
etc...

On the other hand, if I change the following lines:

$buffer = @fread($this->socket, $status['unread_bytes'] - 1);

$contentLength = $contentLength - $status['unread_bytes'] - 1;

Then I get something that looks like:

DBG.SOCK reading 3993 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
DBG.SOCK reading 1 bytes...
etc...

until the entire response has been read (88771 bytes in this case). Also,
this would mean that the effective fread would be:

$buffer = @fread($this->socket, 0);

However, if I just do:

$data = @fread($this->socket, $contentLength);

it works as expected. So what's going on?

For now, I will use the single command in place of the loop, but I really
wanted to monitor the current unread bytes. Any thoughts appreciated.

---
Seairth Jacobs
seairth@seairth.com

Wouldn't it be easier to use something like the following?

while (!feof ($handle)) {
$buffer = fgets($handle, 4096);
echo $buffer;
}

This will read until there's nothing more to read. Isn't that what
you're trying to do?

Read more about it at http://se2.php.net/manual/en/function.fgets.php

//Simon

Seairth Jacobs wrote:
> I have an open socket that I am reading from. The code looks like the
> following:
>
> $contentLength = 0 + $this->response['headers']['content-length'];
>
> do{
> $status = socket_get_status($this->socket);
>
> if( $status['eof'] == 1 ) {
> if( $this->clientOptions['debug'] & DBGSOCK ) echo("DBG.SOCK status
> eof met, finished socket_read\n");
> break;
> }
>
> if($status['unread_bytes'] > 0) {
>
> if($contentLength > $status['unread_bytes']) {
> echo("DBG.SOCK reading {$status['unread_bytes']} bytes...\n");
> $buffer = @fread($this->socket, $status['unread_bytes']);
>
> $contentLength = $contentLength - $status['unread_bytes'];
> } else {
> $buffer = @fread($this->socket, $contentLength);
> $contentLength = 0;
> }
> } else {
> if( $this->clientOptions['debug'] & DBGSOCK ) echo("DBG.SOCK reading
> {$status['unread_bytes']} bytes...\n");
> usleep(1);
> continue;
> }
>
> $data .= $buffer;
> } while($contentLength > 0);
>
>
> Now, the above code hangs (infinite loop, actually), ultimately returning
> something like:
>
> DBG.SOCK reading 3993 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> DBG.SOCK reading 0 bytes...
> etc...
>
> On the other hand, if I change the following lines:
>
> $buffer = @fread($this->socket, $status['unread_bytes'] - 1);
>
> $contentLength = $contentLength - $status['unread_bytes'] - 1;
>
> Then I get something that looks like:
>
> DBG.SOCK reading 3993 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> DBG.SOCK reading 1 bytes...
> etc...
>
> until the entire response has been read (88771 bytes in this case). Also,
> this would mean that the effective fread would be:
>
> $buffer = @fread($this->socket, 0);
>
> However, if I just do:
>
> $data = @fread($this->socket, $contentLength);
>
> it works as expected. So what's going on?
>
> For now, I will use the single command in place of the loop, but I really
> wanted to monitor the current unread bytes. Any thoughts appreciated.
>
> ---
> Seairth Jacobs
> seairth@seairth.com
>
>