![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HIDUsageAndPageFromIndex.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple XNU] / XNU / iokit / Families / IOHIDSystem / IOHIDDescriptorParser|
Return to HIDUsageAndPageFromIndex.c CVS log | Up to [Apple XNU] / XNU / iokit / Families / IOHIDSystem / IOHIDDescriptorParser |
1.1 root 1: /*
2: * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: File: HIDUsageAndPageFromIndex.c
24:
25: Contains: xxx put contents here xxx
26:
27: Version: xxx put version here xxx
28:
29: Copyright: � 1999 by Apple Computer, Inc., all rights reserved.
30:
31: File Ownership:
32:
33: DRI: xxx put dri here xxx
34:
35: Other Contact: xxx put other contact here xxx
36:
37: Technology: xxx put technology here xxx
38:
39: Writers:
40:
41: (BWS) Brent Schorsch
42:
43: Change History (most recent first):
44:
45: <USB1> 3/5/99 BWS first checked in
46: */
47:
48: #include "HIDLib.h"
49:
50: /*
51: *------------------------------------------------------------------------------
52: *
53: * HIDUsageAndPageFromIndex
54: *
55: * Input:
56: * ptPreparsedData - The Preparsed Data
57: * ptReportItem - The Report Item
58: * index - The usage Index
59: * ptUsageAndPage - The usage And Page
60: * Output:
61: * Returns:
62: *
63: *------------------------------------------------------------------------------
64: */
65: void HIDUsageAndPageFromIndex (HIDPreparsedDataRef preparsedDataRef,
66: HIDReportItem *ptReportItem, UInt32 index,
67: HIDUsageAndPage *ptUsageAndPage)
68: {
69: HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef;
70: HIDP_UsageItem *ptUsageItem = NULL;
71: int iUsageItem;
72: int iUsages;
73: int i;
74:
75: /*
76: * Disallow NULL Pointers
77: */
78: if ((ptUsageAndPage == NULL) || (ptReportItem == NULL) || (ptPreparsedData == NULL))
79: {
80: ptUsageAndPage->usagePage = 0;
81: return; // kHIDNullPointerErr;
82: }
83:
84: /*
85: * Index through the usage Items for this ReportItem
86: */
87: iUsageItem = ptReportItem->firstUsageItem;
88: for (i=0; i<ptReportItem->usageItemCount; i++)
89: {
90: /*
91: * Each usage Item is either a usage or a usage range
92: */
93: ptUsageItem = &ptPreparsedData->usageItems[iUsageItem++];
94: if (ptUsageItem->isRange)
95: {
96: /*
97: * For usage Ranges
98: * If the index is in the range
99: * then return the usage
100: * Otherwise adjust the index by the size of the range
101: */
102: iUsages = ptUsageItem->usageMaximum - ptUsageItem->usageMinimum + 1;
103: if (iUsages < 0)
104: iUsages = -iUsages;
105: if (iUsages > index)
106: {
107: ptUsageAndPage->usagePage = ptUsageItem->usagePage;
108: ptUsageAndPage->usage = ptUsageItem->usageMinimum + index;
109: return;
110: }
111: index -= iUsages;
112: }
113: else
114: {
115: /*
116: * For Usages
117: * If the index is zero
118: * then return this usage
119: * Otherwise one less to index through
120: */
121: if (index-- == 0)
122: {
123: ptUsageAndPage->usagePage = ptUsageItem->usagePage;
124: ptUsageAndPage->usage = ptUsageItem->usage;
125: return;
126: }
127: }
128: }
129: if (ptUsageItem != NULL)
130: {
131: ptUsageAndPage->usagePage = ptUsageItem->usagePage;
132: if (ptUsageItem->isRange)
133: ptUsageAndPage->usage = ptUsageItem->usageMaximum;
134: else
135: ptUsageAndPage->usage = ptUsageItem->usage;
136: }
137: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.