Date: Tue, 15 Nov 2011 22:14:43 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Marcus von Appen <mva@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: uhid(4) and report structures Message-ID: <201111152214.43361.hselasky@c2i.net> In-Reply-To: <20111115205406.GB1922@medusa.sysfault.org> References: <mailpost.1321385868.5489178.82004.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw> <4EC2C757.4060303@FreeBSD.org> <20111115205406.GB1922@medusa.sysfault.org>
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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
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