The USB library from NetBSD by Lennart Augustsson <lennart@augustsson.net>.

1 files changed, 99 insertions, 0 deletions

diff --git a/lib/libusbhid/data.c b/lib/libusbhid/data.c
new file mode 100644
index 0000000..26b33b3
--- /dev/null
+++ b/lib/libusbhid/data.c
@@ -0,0 +1,99 @@
+/*	$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;
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(h != NULL);
+
+	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;
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(h != NULL);
+
+	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);
+}