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/* $OpenBSD: data.c,v 1.8 2014/06/04 12:13:30 mpi Exp $ */ |
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/* $NetBSD: data.c,v 1.1 2001/12/28 17:45:26 augustss Exp $ */ |
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/* |
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* Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <stdlib.h> |
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#include "usbhid.h" |
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int32_t |
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hid_get_data(const void *p, const hid_item_t *h) |
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{ |
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const uint8_t *buf; |
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uint32_t hpos; |
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uint32_t hsize; |
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uint32_t data; |
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int i, end, offs; |
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buf = p; |
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#if 0 |
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/* Skip report ID byte. */ |
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if (h->report_ID > 0) |
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buf++; |
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#endif |
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hpos = h->pos; /* bit position of data */ |
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hsize = h->report_size; /* bit length of data */ |
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/* Range check and limit */ |
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if (hsize == 0) |
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return (0); |
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if (hsize > 32) |
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hsize = 32; |
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offs = hpos / 8; |
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end = (hpos + hsize) / 8 - offs; |
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data = 0; |
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for (i = 0; i <= end; i++) |
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data |= buf[offs + i] << (i*8); |
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/* Correctly shift down data */ |
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data >>= hpos % 8; |
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hsize = 32 - hsize; |
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/* Mask and sign extend in one */ |
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if ((h->logical_minimum < 0) || (h->logical_maximum < 0)) |
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data = (int32_t)((int32_t)data << hsize) >> hsize; |
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else |
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data = (uint32_t)((uint32_t)data << hsize) >> hsize; |
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return (data); |
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} |
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void |
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hid_set_data(void *p, const hid_item_t *h, int32_t data) |
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{ |
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uint8_t *buf; |
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uint32_t hpos; |
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uint32_t hsize; |
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uint32_t mask; |
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int i; |
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int end; |
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int offs; |
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buf = p; |
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#if 0 |
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/* Set report ID byte. */ |
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if (h->report_ID > 0) |
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*buf++ = h->report_ID & 0xff; |
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#endif |
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hpos = h->pos; /* bit position of data */ |
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hsize = h->report_size; /* bit length of data */ |
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if (hsize != 32) { |
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mask = (1 << hsize) - 1; |
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data &= mask; |
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} else |
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mask = ~0; |
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data <<= (hpos % 8); |
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mask <<= (hpos % 8); |
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mask = ~mask; |
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offs = hpos / 8; |
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end = (hpos + hsize) / 8 - offs; |
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for (i = 0; i <= end; i++) |
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buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) | |
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((data >> (i*8)) & 0xff); |
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} |