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//------------------------------------------------------------------------------
// <copyright file="SafeHandles.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace System.Data.OleDb {
using System;
using System.Data.Common;
using System.Data.ProviderBase;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Threading;
using System.Runtime.ConstrainedExecution;
internal sealed class DualCoTaskMem : SafeHandle {
private IntPtr handle2; // this must be protected so derived classes can use out params.
private DualCoTaskMem() : base(IntPtr.Zero, true) {
this.handle2 = IntPtr.Zero;
}
// IDBInfo.GetLiteralInfo
internal DualCoTaskMem(UnsafeNativeMethods.IDBInfo dbInfo, int[] literals, out int literalCount, out IntPtr literalInfo, out OleDbHResult hr) : this() {
int count = (null != literals) ? literals.Length : 0;
Bid.Trace("<oledb.IDBInfo.GetLiteralInfo|API|OLEDB>\n");
hr = dbInfo.GetLiteralInfo(count, literals, out literalCount, out base.handle, out this.handle2);
literalInfo = base.handle;
Bid.Trace("<oledb.IDBInfo.GetLiteralInfo|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
// IColumnsInfo.GetColumnInfo
internal DualCoTaskMem(UnsafeNativeMethods.IColumnsInfo columnsInfo, out IntPtr columnCount, out IntPtr columnInfos, out OleDbHResult hr) : this() {
Bid.Trace("<oledb.IColumnsInfo.GetColumnInfo|API|OLEDB>\n");
hr = columnsInfo.GetColumnInfo(out columnCount, out base.handle, out this.handle2);
columnInfos = base.handle;
Bid.Trace("<oledb.IColumnsInfo.GetColumnInfo|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
// IDBSchemaRowset.GetSchemas
internal DualCoTaskMem(UnsafeNativeMethods.IDBSchemaRowset dbSchemaRowset, out int schemaCount, out IntPtr schemaGuids, out IntPtr schemaRestrictions, out OleDbHResult hr) : this() {
Bid.Trace("<oledb.IDBSchemaRowset.GetSchemas|API|OLEDB>\n");
hr = dbSchemaRowset.GetSchemas(out schemaCount, out base.handle, out this.handle2);
schemaGuids = base.handle;
schemaRestrictions = this.handle2;
Bid.Trace("<oledb.IDBSchemaRowset.GetSchemas|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
internal DualCoTaskMem(UnsafeNativeMethods.IColumnsRowset icolumnsRowset, out IntPtr cOptColumns, out OleDbHResult hr) : base(IntPtr.Zero, true) {
Bid.Trace("<oledb.IColumnsRowset.GetAvailableColumns|API|OLEDB>\n");
hr = icolumnsRowset.GetAvailableColumns(out cOptColumns, out base.handle);
Bid.Trace("<oledb.IColumnsRowset.GetAvailableColumns|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
public override bool IsInvalid {
get {
return (((IntPtr.Zero == base.handle)) && (IntPtr.Zero == this.handle2));
}
}
protected override bool ReleaseHandle() {
// NOTE: The SafeHandle class guarantees this will be called exactly once.
IntPtr ptr = base.handle;
base.handle = IntPtr.Zero;
if (IntPtr.Zero != ptr) {
SafeNativeMethods.CoTaskMemFree(ptr);
}
ptr = this.handle2;
this.handle2 = IntPtr.Zero;
if (IntPtr.Zero != ptr) {
SafeNativeMethods.CoTaskMemFree(ptr);
}
return true;
}
}
internal sealed class RowHandleBuffer : DbBuffer {
internal RowHandleBuffer(IntPtr rowHandleFetchCount) : base((int)rowHandleFetchCount*ADP.PtrSize) {
}
internal IntPtr GetRowHandle(int index) {
IntPtr value = ReadIntPtr( index * ADP.PtrSize);
Debug.Assert(ODB.DB_NULL_HROW != value, "bad rowHandle");
return value;
}
}
internal sealed class StringMemHandle : DbBuffer {
internal StringMemHandle(string value) : base((null != value) ? checked(2+2*value.Length) : 0) {
if (null != value) {
// null-termination exists because of the extra 2+ which is zero'd during on allocation
WriteCharArray(0, value.ToCharArray(), 0, value.Length);
}
}
}
internal sealed class ChapterHandle : WrappedIUnknown {
internal static readonly ChapterHandle DB_NULL_HCHAPTER = new ChapterHandle(IntPtr.Zero);
private IntPtr _chapterHandle;
internal static ChapterHandle CreateChapterHandle(object chapteredRowset, RowBinding binding, int valueOffset) {
if ((null == chapteredRowset) || (IntPtr.Zero == binding.ReadIntPtr(valueOffset))) {
return ChapterHandle.DB_NULL_HCHAPTER;
}
return new ChapterHandle(chapteredRowset, binding, valueOffset);
}
// from ADODBRecordSetConstruction we do not want to release the initial chapter handle
internal static ChapterHandle CreateChapterHandle(IntPtr chapter) {
if (IntPtr.Zero == chapter) {
return ChapterHandle.DB_NULL_HCHAPTER;
}
return new ChapterHandle(chapter);
}
// from ADODBRecordSetConstruction we do not want to release the initial chapter handle
private ChapterHandle(IntPtr chapter) : base((object)null) {
_chapterHandle = chapter;
}
private ChapterHandle(object chapteredRowset, RowBinding binding, int valueOffset) : base(chapteredRowset) {
RuntimeHelpers.PrepareConstrainedRegions();
try {} finally {
_chapterHandle = binding.InterlockedExchangePointer(valueOffset);
}
}
internal IntPtr HChapter {
get {
return _chapterHandle;
}
}
protected override bool ReleaseHandle() {
// NOTE: The SafeHandle class guarantees this will be called exactly once and is non-interrutible.
IntPtr chapter = _chapterHandle;
_chapterHandle = IntPtr.Zero;
if ((IntPtr.Zero != base.handle) && (IntPtr.Zero != chapter)) {
Bid.Trace("<oledb.IChapteredRowset.ReleaseChapter|API|OLEDB> Chapter=%Id\n", chapter);
OleDbHResult hr = (OleDbHResult)NativeOledbWrapper.IChapteredRowsetReleaseChapter(base.handle, chapter);
Bid.Trace("<oledb.IChapteredRowset.ReleaseChapter|API|OLEDB|RET> %08X{HRESULT}\n", hr);
}
return base.ReleaseHandle();
}
}
}
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