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Annotation of XNU/iokit/Families/IOHIDSystem/IOHIDDescriptorParser/HIDProcessCollection.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:           HIDProcessCollection.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:  * HIDProcessCollection - Process a Collection MainItem
        !            54:  *
        !            55:  *      Input:
        !            56:  *                       ptDescriptor                  - The Descriptor Structure
        !            57:  *                       ptPreparsedData               - The PreParsedData Structure
        !            58:  *      Output:
        !            59:  *                       ptDescriptor                  - The Descriptor Structure
        !            60:  *                       ptPreparsedData               - The PreParsedData Structure
        !            61:  *      Returns:
        !            62:  *                       kHIDSuccess              - Success
        !            63:  *                       kHIDNullPointerErr      - Argument, Pointer was Null
        !            64:  *
        !            65:  *------------------------------------------------------------------------------
        !            66: */
        !            67: OSStatus HIDProcessCollection(HIDReportDescriptor *ptDescriptor, HIDPreparsedDataPtr ptPreparsedData)
        !            68: {
        !            69:        HIDCollection *collections;
        !            70:        HIDCollection *ptCollection;
        !            71:        int parent;
        !            72:        int iCollection;
        !            73: /*
        !            74:  *     Disallow NULL Pointers
        !            75: */
        !            76:        if ((ptDescriptor == NULL) || (ptPreparsedData == NULL))
        !            77:                return kHIDNullPointerErr;
        !            78: /*
        !            79:  *     Initialize the new Collection Structure
        !            80: */
        !            81:        iCollection = ptPreparsedData->collectionCount++;
        !            82:        collections = ptPreparsedData->collections;
        !            83:        ptCollection = &collections[iCollection];
        !            84:        ptCollection->data = ptDescriptor->item.unsignedValue;
        !            85:        ptCollection->firstUsageItem = ptDescriptor->firstUsageItem;
        !            86:        ptCollection->usageItemCount = ptPreparsedData->usageItemCount - ptDescriptor->firstUsageItem;
        !            87:        ptDescriptor->firstUsageItem = ptPreparsedData->usageItemCount;
        !            88:        ptCollection->children = 0;
        !            89:        ptCollection->nextSibling = ptDescriptor->sibling;
        !            90:        ptDescriptor->sibling = 0;
        !            91:        ptCollection->firstChild = 0;
        !            92:        ptCollection->usagePage = ptDescriptor->globals.usagePage;
        !            93:        ptCollection->firstReportItem = ptPreparsedData->reportItemCount;
        !            94: /*
        !            95:  *     Set up the relationship with the parent Collection
        !            96: */
        !            97:        parent = ptDescriptor->parent;
        !            98:        ptCollection->parent = parent;
        !            99:        collections[parent].firstChild = iCollection;
        !           100:        collections[parent].children++;
        !           101:        ptDescriptor->parent = iCollection;
        !           102: /*
        !           103:  *     Save the parent Collection Information on the stack
        !           104: */
        !           105:        ptDescriptor->collectionStack[ptDescriptor->collectionNesting++] = parent;
        !           106:        return kHIDSuccess;
        !           107: }
        !           108: 
        !           109: /*
        !           110:  *------------------------------------------------------------------------------
        !           111:  *
        !           112:  * HIDProcessEndCollection - Process an EndCollection MainItem
        !           113:  *
        !           114:  *      Input:
        !           115:  *                       ptDescriptor                  - The Descriptor Structure
        !           116:  *                       ptPreparsedData               - The PreParsedData Structure
        !           117:  *      Output:
        !           118:  *                       ptPreparsedData               - The PreParsedData Structure
        !           119:  *      Returns:
        !           120:  *                       kHIDSuccess              - Success
        !           121:  *                       kHIDNullPointerErr      - Argument, Pointer was Null
        !           122:  *
        !           123:  *------------------------------------------------------------------------------
        !           124: */
        !           125: OSStatus HIDProcessEndCollection(HIDReportDescriptor *ptDescriptor, HIDPreparsedDataPtr ptPreparsedData)
        !           126: {
        !           127:        HIDCollection *ptCollection;
        !           128:        int iCollection;
        !           129: /*
        !           130:  *     Remember the number of ReportItem MainItems in this Collection
        !           131: */
        !           132:        ptCollection = &ptPreparsedData->collections[ptDescriptor->parent];
        !           133:        ptCollection->reportItemCount = ptPreparsedData->reportItemCount - ptCollection->firstReportItem;
        !           134: /*
        !           135:  *     Restore the parent Collection Data
        !           136: */
        !           137:        iCollection = ptDescriptor->collectionStack[--ptDescriptor->collectionNesting];
        !           138:        ptDescriptor->sibling = ptDescriptor->parent;
        !           139:        ptDescriptor->parent = iCollection;
        !           140:        return kHIDSuccess;
        !           141: }

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