mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* $NetBSD: data.c,v 1.8 2000/04/02 11:10:53 augustss Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include "libusb.h"
|
|
|
|
int
|
|
hid_get_data(const void *p, const hid_item_t *h)
|
|
{
|
|
const unsigned char *buf;
|
|
unsigned int hpos;
|
|
unsigned int hsize;
|
|
int data;
|
|
int i, end, offs;
|
|
|
|
buf = p;
|
|
hpos = h->pos; /* bit position of data */
|
|
hsize = h->report_size; /* bit length of data */
|
|
|
|
if (hsize == 0)
|
|
return (0);
|
|
offs = hpos / 8;
|
|
end = (hpos + hsize) / 8 - offs;
|
|
data = 0;
|
|
for (i = 0; i <= end; i++)
|
|
data |= buf[offs + i] << (i*8);
|
|
data >>= hpos % 8;
|
|
data &= (1 << hsize) - 1;
|
|
if (h->logical_minimum < 0) {
|
|
/* Need to sign extend */
|
|
hsize = sizeof data * 8 - hsize;
|
|
data = (data << hsize) >> hsize;
|
|
}
|
|
return (data);
|
|
}
|
|
|
|
void
|
|
hid_set_data(void *p, const hid_item_t *h, int data)
|
|
{
|
|
unsigned char *buf;
|
|
unsigned int hpos;
|
|
unsigned int hsize;
|
|
int i, end, offs, mask;
|
|
|
|
buf = p;
|
|
hpos = h->pos; /* bit position of data */
|
|
hsize = h->report_size; /* bit length of data */
|
|
|
|
if (hsize != 32) {
|
|
mask = (1 << hsize) - 1;
|
|
data &= mask;
|
|
} else
|
|
mask = ~0;
|
|
|
|
data <<= (hpos % 8);
|
|
mask <<= (hpos % 8);
|
|
mask = ~mask;
|
|
|
|
offs = hpos / 8;
|
|
end = (hpos + hsize) / 8 - offs;
|
|
|
|
for (i = 0; i <= end; i++)
|
|
buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
|
|
((data >> (i*8)) & 0xff);
|
|
}
|