63 lines
2.5 KiB
C#
63 lines
2.5 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="PropertyIDSet.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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using System;
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using System.Data;
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using System.Data.Common;
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using System.Data.ProviderBase;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using System.Security;
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using System.Security.Permissions;
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namespace System.Data.OleDb {
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internal sealed class PropertyIDSet : DbBuffer {
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static private readonly int PropertyIDSetAndValueSize = ODB.SizeOf_tagDBPROPIDSET + ADP.PtrSize; // sizeof(tagDBPROPIDSET) + sizeof(int)
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static private readonly int PropertyIDSetSize = ODB.SizeOf_tagDBPROPIDSET;
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private int _count;
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// the PropertyID is stored at the end of the tagDBPROPIDSET structure
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// this way only a single memory allocation is required instead of two
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internal PropertyIDSet(Guid propertySet, int propertyID) : base(PropertyIDSetAndValueSize) {
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_count = 1;
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// rgPropertyIDs references where that PropertyID is stored
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// depending on IntPtr.Size, tagDBPROPIDSET is either 24 or 28 bytes long
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IntPtr ptr = ADP.IntPtrOffset(base.handle, PropertyIDSetSize);
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Marshal.WriteIntPtr(base.handle, 0, ptr);
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Marshal.WriteInt32(base.handle, ADP.PtrSize, /*propertyid count*/1);
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ptr = ADP.IntPtrOffset(base.handle, ODB.OffsetOf_tagDBPROPIDSET_PropertySet);
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Marshal.StructureToPtr(propertySet, ptr, false/*deleteold*/);
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// write the propertyID at the same offset
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Marshal.WriteInt32(base.handle, PropertyIDSetSize, propertyID);
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}
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// no propertyIDs, just the propertyset guids
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internal PropertyIDSet(Guid[] propertySets) : base(PropertyIDSetSize * propertySets.Length) {
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_count = propertySets.Length;
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for(int i = 0; i < propertySets.Length; ++i) {
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IntPtr ptr = ADP.IntPtrOffset(base.handle, (i * PropertyIDSetSize) + ODB.OffsetOf_tagDBPROPIDSET_PropertySet);
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Marshal.StructureToPtr(propertySets[i], ptr, false/*deleteold*/);
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}
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}
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internal int Count {
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get {
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return _count;
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}
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}
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}
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}
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