freebsd-dev/lib/libusbhid/parse.c
2000-07-07 08:15:19 +00:00

389 lines
7.8 KiB
C

/* $NetBSD: parse.c,v 1.9 2000/03/17 18:09:17 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 <string.h>
#include <sys/time.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>
#include "libusb.h"
#include "usbvar.h"
#define MAXUSAGE 100
struct hid_data {
u_char *start;
u_char *end;
u_char *p;
hid_item_t cur;
unsigned int usages[MAXUSAGE];
int nusage;
int minset;
int multi;
int multimax;
int kindset;
};
static int min(int x, int y) { return x < y ? x : y; }
static void
hid_clear_local(hid_item_t *c)
{
c->usage = 0;
c->usage_minimum = 0;
c->usage_maximum = 0;
c->designator_index = 0;
c->designator_minimum = 0;
c->designator_maximum = 0;
c->string_index = 0;
c->string_minimum = 0;
c->string_maximum = 0;
c->set_delimiter = 0;
}
hid_data_t
hid_start_parse(report_desc_t d, int kindset)
{
struct hid_data *s;
s = malloc(sizeof *s);
memset(s, 0, sizeof *s);
s->start = s->p = d->data;
s->end = d->data + d->size;
s->kindset = kindset;
return (s);
}
void
hid_end_parse(hid_data_t s)
{
while (s->cur.next) {
hid_item_t *hi = s->cur.next->next;
free(s->cur.next);
s->cur.next = hi;
}
free(s);
}
int
hid_get_item(hid_data_t s, hid_item_t *h)
{
hid_item_t *c;
unsigned int bTag = 0, bType = 0, bSize, oldpos;
unsigned char *data;
int dval;
unsigned char *p;
hid_item_t *hi;
int i;
c = &s->cur;
top:
if (s->multimax) {
if (s->multi < s->multimax) {
c->usage = s->usages[min(s->multi, s->nusage-1)];
s->multi++;
*h = *c;
c->pos += c->report_size;
h->next = 0;
return (1);
} else {
c->report_count = s->multimax;
s->multimax = 0;
s->nusage = 0;
hid_clear_local(c);
}
}
for (;;) {
p = s->p;
if (p >= s->end)
return (0);
bSize = *p++;
if (bSize == 0xfe) {
/* long item */
bSize = *p++;
bSize |= *p++ << 8;
bTag = *p++;
data = p;
p += bSize;
} else {
/* short item */
bTag = bSize >> 4;
bType = (bSize >> 2) & 3;
bSize &= 3;
if (bSize == 3) bSize = 4;
data = p;
p += bSize;
}
s->p = p;
/*
* The spec is unclear if the data is signed or unsigned.
*/
switch(bSize) {
case 0:
dval = 0;
break;
case 1:
dval = (int8_t)*data++;
break;
case 2:
dval = *data++;
dval |= *data++ << 8;
dval = (int16_t)dval;
break;
case 4:
dval = *data++;
dval |= *data++ << 8;
dval |= *data++ << 16;
dval |= *data++ << 24;
break;
default:
return (-1);
}
switch (bType) {
case 0: /* Main */
switch (bTag) {
case 8: /* Input */
if (!(s->kindset & (1 << hid_input)))
continue;
c->kind = hid_input;
c->flags = dval;
ret:
if (c->flags & HIO_VARIABLE) {
s->multimax = c->report_count;
s->multi = 0;
c->report_count = 1;
if (s->minset) {
for (i = c->usage_minimum;
i <= c->usage_maximum;
i++) {
s->usages[s->nusage] = i;
if (s->nusage < MAXUSAGE-1)
s->nusage++;
}
s->minset = 0;
}
goto top;
} else {
if (s->minset)
c->usage = c->usage_minimum;
*h = *c;
h->next = 0;
c->pos += c->report_size * c->report_count;
hid_clear_local(c);
s->minset = 0;
return (1);
}
case 9: /* Output */
if (!(s->kindset & (1 << hid_output)))
continue;
c->kind = hid_output;
c->flags = dval;
goto ret;
case 10: /* Collection */
c->kind = hid_collection;
c->collection = dval;
c->collevel++;
*h = *c;
hid_clear_local(c);
c->report_ID = NO_REPORT_ID;
s->nusage = 0;
return (1);
case 11: /* Feature */
if (!(s->kindset & (1 << hid_feature)))
continue;
c->kind = hid_feature;
c->flags = dval;
goto ret;
case 12: /* End collection */
c->kind = hid_endcollection;
c->collevel--;
*h = *c;
/*hid_clear_local(c);*/
s->nusage = 0;
return (1);
default:
return (-2);
}
case 1: /* Global */
switch (bTag) {
case 0:
c->_usage_page = dval << 16;
break;
case 1:
c->logical_minimum = dval;
break;
case 2:
c->logical_maximum = dval;
break;
case 3:
c->physical_maximum = dval;
break;
case 4:
c->physical_maximum = dval;
break;
case 5:
c->unit_exponent = dval;
break;
case 6:
c->unit = dval;
break;
case 7:
c->report_size = dval;
break;
case 8:
c->report_ID = dval;
break;
case 9:
c->report_count = dval;
break;
case 10: /* Push */
hi = malloc(sizeof *hi);
*hi = s->cur;
c->next = hi;
break;
case 11: /* Pop */
hi = c->next;
oldpos = c->pos;
s->cur = *hi;
c->pos = oldpos;
free(hi);
break;
default:
return (-3);
}
break;
case 2: /* Local */
switch (bTag) {
case 0:
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage = dval;
if (s->nusage < MAXUSAGE)
s->usages[s->nusage++] = dval;
/* else XXX */
break;
case 1:
s->minset = 1;
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage_minimum = dval;
break;
case 2:
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage_maximum = dval;
break;
case 3:
c->designator_index = dval;
break;
case 4:
c->designator_minimum = dval;
break;
case 5:
c->designator_maximum = dval;
break;
case 7:
c->string_index = dval;
break;
case 8:
c->string_minimum = dval;
break;
case 9:
c->string_maximum = dval;
break;
case 10:
c->set_delimiter = dval;
break;
default:
return (-4);
}
break;
default:
return (-5);
}
}
}
int
hid_report_size(report_desc_t r, enum hid_kind k, int *idp)
{
struct hid_data *d;
hid_item_t h;
int size, id;
id = 0;
if (idp)
*idp = 0;
memset(&h, 0, sizeof h);
for (d = hid_start_parse(r, 1<<k); hid_get_item(d, &h); ) {
if (h.report_ID != NO_REPORT_ID) {
if (idp)
*idp = h.report_ID;
id = 8;
}
}
hid_end_parse(d);
size = h.pos + id;
return ((size + 7) / 8);
}
int
hid_locate(desc, u, k, h)
report_desc_t desc;
unsigned int u;
enum hid_kind k;
hid_item_t *h;
{
hid_data_t d;
for (d = hid_start_parse(desc, 1<<k); hid_get_item(d, h); ) {
if (h->kind == k && !(h->flags & HIO_CONST) && h->usage == u) {
hid_end_parse(d);
return (1);
}
}
hid_end_parse(d);
h->report_size = 0;
return (0);
}