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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDCheckReport.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:           HIDCheckReport.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:  * HIDCheckReport - Check the Report ID, Type, and Length
        !            54:  *
        !            55:  *      Input:
        !            56:  *                       reportType               - The Specified Report Type
        !            57:  *                       ptPreparsedData               - The Preparsed Data
        !            58:  *                       ptReportItem                  - The Report Item
        !            59:  *                       psReport                              - The Report
        !            60:  *                       iReportLength                 - The Report Length
        !            61:  *      Output:
        !            62:  *      Returns:
        !            63:  *                       kHIDSuccess, HidP_IncompatibleReportID,
        !            64:  *                       kHIDInvalidReportLengthErr, kHIDInvalidReportTypeErr
        !            65:  *
        !            66:  *------------------------------------------------------------------------------
        !            67: */
        !            68: OSStatus HIDCheckReport(HIDReportType reportType, HIDPreparsedDataRef preparsedDataRef,
        !            69:                                                         HIDReportItem *ptReportItem, void *report, UInt32 iReportLength)
        !            70: {
        !            71:        HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef;
        !            72:        int reportID, reportIndex;
        !            73:        int iExpectedLength;
        !            74:        Byte * psReport = report;
        !            75: /*
        !            76:  *     See if this is the correct Report ID
        !            77: */
        !            78:        reportID = psReport[0]&0xFF;
        !            79:        if ((ptPreparsedData->reportCount > 1)
        !            80:         && (reportID != ptReportItem->globals.reportID))
        !            81:                return kHIDIncompatibleReportErr;
        !            82: /*
        !            83:  *     Check for the correct Length for the Type
        !            84: */
        !            85:        reportIndex = ptReportItem->globals.reportIndex;
        !            86:        switch(reportType)
        !            87:        {
        !            88:                case kHIDInputReport:
        !            89:                        iExpectedLength = (ptPreparsedData->reports[reportIndex].inputBitCount + 7)/8;
        !            90:                        break;
        !            91:                case kHIDOutputReport:
        !            92:                        iExpectedLength = (ptPreparsedData->reports[reportIndex].outputBitCount + 7)/8;
        !            93:                        break;
        !            94:                case kHIDFeatureReport:
        !            95:                        iExpectedLength = (ptPreparsedData->reports[reportIndex].featureBitCount + 7)/8;
        !            96:                        break;
        !            97:                default:
        !            98:                        return kHIDInvalidReportTypeErr;
        !            99:        }
        !           100:        if (iExpectedLength != iReportLength)
        !           101:                return kHIDInvalidReportLengthErr;
        !           102:        if (reportType != ptReportItem->reportType)
        !           103:                return kHIDIncompatibleReportErr;
        !           104:        return kHIDSuccess;
        !           105: }

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