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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDCheckReport.c, revision 1.1.1.1

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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