/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* File: HIDCheckReport.c */ #include "HIDLib.h" /* *------------------------------------------------------------------------------ * * HIDCheckReport - Check the Report ID, Type, and Length * * Input: * reportType - The Specified Report Type * ptPreparsedData - The Preparsed Data * ptReportItem - The Report Item * psReport - The Report * iReportLength - The Report Length * Output: * Returns: * kHIDSuccess, HidP_IncompatibleReportID, * kHIDInvalidReportLengthErr, kHIDInvalidReportTypeErr * *------------------------------------------------------------------------------ */ OSStatus HIDCheckReport(HIDReportType reportType, HIDPreparsedDataRef preparsedDataRef, HIDReportItem *ptReportItem, void *report, UInt32 iReportLength) { HIDPreparsedDataPtr ptPreparsedData = (HIDPreparsedDataPtr) preparsedDataRef; int reportID, reportIndex; int iExpectedLength; Byte * psReport = report; /* * See if this is the correct Report ID */ reportID = psReport[0]&0xFF; if ((ptPreparsedData->reportCount > 1) && (reportID != ptReportItem->globals.reportID)) return kHIDIncompatibleReportErr; /* * Check for the correct Length for the Type */ reportIndex = ptReportItem->globals.reportIndex; switch(reportType) { case kHIDInputReport: iExpectedLength = (ptPreparsedData->reports[reportIndex].inputBitCount + 7)/8; break; case kHIDOutputReport: iExpectedLength = (ptPreparsedData->reports[reportIndex].outputBitCount + 7)/8; break; case kHIDFeatureReport: iExpectedLength = (ptPreparsedData->reports[reportIndex].featureBitCount + 7)/8; break; default: return kHIDInvalidReportTypeErr; } if (iExpectedLength != iReportLength) return kHIDInvalidReportLengthErr; if (reportType != ptReportItem->reportType) return kHIDIncompatibleReportErr; return kHIDSuccess; }