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From: Hans Petter Selasky <hselasky@c2i.net>
To: Marcus von Appen <mva@freebsd.org>
Date: Tue, 15 Nov 2011 22:14:43 +0100
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Cc: freebsd-current@freebsd.org
Subject: Re: uhid(4) and report structures
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On Tuesday 15 November 2011 21:54:06 Marcus von Appen wrote:
> struct usb_ctl_report {
>     int     ucr_report;
>     u_char  ucr_data[1024];
> };

Hi,

Before the descriptor length was limited to 1024 bytes.

Now it is limited to 65535 bytes, which is the USB maximum for control 
endpoints.

Having a buffer this large by default does not make sense, so a pointer and 
length is the best solution.

The application also sometimes know about what descriptor size(s) it expects.

--HPS