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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDUsageInRange.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:           HIDUsageInRange.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:  * HIDUsageInRange
        !            54:  *
        !            55:  *      Input:
        !            56:  *                       ptUsage                               - The usage/UsageRange Item
        !            57:  *                       usagePage                        - The usagePage of the Item - or zero
        !            58:  *                       usage                            - The usage of the Item
        !            59:  *      Output:
        !            60:  *      Returns:
        !            61:  *                       true                                  - usagePage/usage is in usage/UsageRange
        !            62:  *                       false                                 - usagePage/usage is not in usage/UsageRange
        !            63:  *
        !            64:  *------------------------------------------------------------------------------
        !            65: */
        !            66: Boolean HIDUsageInRange (HIDP_UsageItem *ptUsage, HIDUsage usagePage, HIDUsage usage)
        !            67: {
        !            68: /*
        !            69:  *     Disallow Null Pointers
        !            70: */
        !            71:        if (ptUsage == NULL)
        !            72:                return false;
        !            73: /*
        !            74:  *     Check for the proper Page, 0 means don't care
        !            75: */
        !            76:        if ((usagePage != 0) && (ptUsage->usagePage != usagePage))
        !            77:                return false;
        !            78: /*
        !            79:  *     usage = 0 means don't care
        !            80: */
        !            81:        if (usage == 0)
        !            82:                return true;
        !            83: /*
        !            84:  *     The requested usage must match or be in the range
        !            85: */
        !            86:        if (ptUsage->isRange)
        !            87:        {
        !            88:                if ((ptUsage->usageMinimum > usage) || (ptUsage->usageMaximum < usage))
        !            89:                        return false;
        !            90:        }
        !            91:        else
        !            92:        {
        !            93:                if (ptUsage->usage != usage)
        !            94:                        return false;
        !            95:        }
        !            96:        return true;
        !            97: }

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