def unpack$\_$transfer$\_$request$\_$message$($self$,$ bytes$)$:

$"""$

Unpack a client transfer request message into its component fields.

A transfer request message consists of the following fields:

$-$ Filename length $($unsigned short$)$

$-$ Filename $($string of variable length$)$

$-$ File size in bytes $($unsigned int$)$

$-$ Chunk size in bytes $($unsigned short$)$

$-$ Checksum length in bytes $($unsigned char$)$

Since you don't know how long the filename is you'll want to first unpack the filename$\_$length

field and then use that to unpack the rest of the message.

Args:

bytes $($bytes$)$: The packed binary transfer request message from the client.

Returns:

tuple: A tuple $($filename$,$ file$\_$size, chunk$\_$size, checksum$\_$length$),$ where:

$-$ filename $($str$)$: The name of the file being transferred.

$-$ file$\_$size $($int$)$: The total size of the file in bytes.

$-$ chunk$\_$size $($int$)$: The size of each chunk of the file to be sent.

$-$ checksum$\_$length $($int$)$: The length in bytes of the checksum hash used.

Useage Example:

filename, file$\_$size, chunk$\_$size, checksum$\_$length $=$ self.unpack$\_$transfer$\_$request$\_$message$($data$)$

$""".$ Please Answer in Python. Thank You