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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDUsageAndPageFromIndex.c, revision 1.1

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: }

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