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Top Forums Shell Programming and Scripting Extract sequences of bytes from binary for differents blocks Post 302844249 by Ophiuchus on Saturday 17th of August 2013 05:15:14 PM
Old 08-17-2013
Hello ahamed,

Sorry, maybe I didn't explaine me very well.

The sequence after FF 34 if present is 0x03 and after 0x03 could be follow by 0x80 or 0x81.... etc. Because of that I've put 0x8Z, where Z=0,1,3,4,6 or 7.

But independently which is the byte that appear after 0x03, the byte 0x03 only will appear once to represent the begin of this sub-block of sequences.

So, if I call the sequences like follow:
Z1=80 B1 B2 ... B16
Z2=81 B1 B2 ... B16
Z3=83 B1 B2 ... B16
.
.
Z6=87 B1 B2 ... B16

Then, if 0x03 is present the "sub-block" could contain:
0x03 Z1 Z2 Z3
or
0x03 Z2 Z3 Z6
or
0x03 Z1 Z2 Z3 Z4 Z5 Z6
or only one sequence like
0x03 Zx

But I would like to extract all the sequences in sub-block independently if
has all sequences Z1 to Z6 or if only have 1 sequence Zx.

I hope is not too complicated and you can help me.

Thanks in advance for all the help.
 

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SOCKET_SENDTO(3)							 1							  SOCKET_SENDTO(3)

socket_sendto - Sends a message to a socket, whether it is connected or not

SYNOPSIS
int socket_sendto (resource $socket, string $buf, int $len, int $flags, string $addr, [int $port]) DESCRIPTION
The function socket_sendto(3) sends $len bytes from $buf through the socket $socket to the $port at the address $addr. PARAMETERS
o $socket - A valid socket resource created using socket_create(3). o $buf - The sent data will be taken from buffer $buf. o $len -$len bytes from $buf will be sent. o $flags - The value of $flags can be any combination of the following flags, joined with the binary OR ( |) operator. Possible values for $flags +--------------+---------------------------------------------------+ | | | | MSG_OOB | | | | | | | Send OOB (out-of-band) data. | | | | | | | | MSG_EOR | | | | | | | Indicate a record mark. The sent data completes | | | the record. | | | | | | | | MSG_EOF | | | | | | | Close the sender side of the socket and include | | | an appropriate notification of this at the end of | | | the sent data. The sent data completes the trans- | | | action. | | | | | | | |MSG_DONTROUTE | | | | | | | Bypass routing, use direct interface. | | | | +--------------+---------------------------------------------------+ o $addr - IP address of the remote host. o $port -$port is the remote port number at which the data will be sent. RETURN VALUES
socket_sendto(3) returns the number of bytes sent to the remote host, or FALSE if an error occurred. EXAMPLES
Example #1 socket_sendto(3) Example <?php $sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); $msg = "Ping !"; $len = strlen($msg); socket_sendto($sock, $msg, $len, 0, '127.0.0.1', 1223); socket_close($sock); ?> SEE ALSO
socket_send(3). PHP Documentation Group SOCKET_SENDTO(3)
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