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//------------------------------------------------------------------------------
// <copyright file="DBPropSet.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>
//------------------------------------------------------------------------------
using System;
using System.Data;
using System.Data.Common;
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;
namespace System.Data.OleDb {
sealed internal class DBPropSet : SafeHandle {
private readonly Int32 propertySetCount;
// VSDD 621427: stores the exception with last error.HRESULT from IDBProperties.GetProperties
private Exception lastErrorFromProvider;
private DBPropSet() : base(IntPtr.Zero, true) {
propertySetCount = 0;
}
internal DBPropSet(int propertysetCount) : this() {
this.propertySetCount = propertysetCount;
IntPtr countOfBytes = (IntPtr)(propertysetCount * ODB.SizeOf_tagDBPROPSET);
RuntimeHelpers.PrepareConstrainedRegions();
try {} finally {
base.handle = SafeNativeMethods.CoTaskMemAlloc(countOfBytes);
if (ADP.PtrZero != base.handle) {
SafeNativeMethods.ZeroMemory(base.handle, countOfBytes);
}
}
if (ADP.PtrZero == base.handle) {
throw new OutOfMemoryException();
}
}
internal DBPropSet(UnsafeNativeMethods.IDBProperties properties, PropertyIDSet propidset, out OleDbHResult hr) : this() {
Debug.Assert(null != properties, "null IDBProperties");
int propidsetcount = 0;
if (null != propidset) {
propidsetcount = propidset.Count;
}
Bid.Trace("<oledb.IDBProperties.GetProperties|API|OLEDB>\n");
hr = properties.GetProperties(propidsetcount, propidset, out this.propertySetCount, out base.handle);
Bid.Trace("<oledb.IDBProperties.GetProperties|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if (hr < 0) {
// VSDD 621427: remember the last HRESULT. Note we do not want to raise exception now to avoid breaking change from Orcas RTM/SP1
SetLastErrorInfo(hr);
}
}
internal DBPropSet(UnsafeNativeMethods.IRowsetInfo properties, PropertyIDSet propidset, out OleDbHResult hr) : this() {
Debug.Assert(null != properties, "null IRowsetInfo");
int propidsetcount = 0;
if (null != propidset) {
propidsetcount = propidset.Count;
}
Bid.Trace("<oledb.IRowsetInfo.GetProperties|API|OLEDB>\n");
hr = properties.GetProperties(propidsetcount, propidset, out this.propertySetCount, out base.handle);
Bid.Trace("<oledb.IRowsetInfo.GetProperties|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if (hr < 0) {
// VSDD 621427: remember the last HRESULT. Note we do not want to raise exception now to avoid breaking change from Orcas RTM/SP1
SetLastErrorInfo(hr);
}
}
internal DBPropSet(UnsafeNativeMethods.ICommandProperties properties, PropertyIDSet propidset, out OleDbHResult hr) : this() {
Debug.Assert(null != properties, "null ICommandProperties");
int propidsetcount = 0;
if (null != propidset) {
propidsetcount = propidset.Count;
}
Bid.Trace("<oledb.ICommandProperties.GetProperties|API|OLEDB>\n");
hr = properties.GetProperties(propidsetcount, propidset, out this.propertySetCount, out base.handle);
Bid.Trace("<oledb.ICommandProperties.GetProperties|API|OLEDB|RET> %08X{HRESULT}\n", hr);
if (hr < 0) {
// VSDD 621427: remember the last HRESULT. Note we do not want to raise exception now to avoid breaking change from Orcas RTM/SP1
SetLastErrorInfo(hr);
}
}
private void SetLastErrorInfo(OleDbHResult lastErrorHr) {
// note: OleDbHResult is actually a simple wrapper over HRESULT with OLEDB-specific codes
UnsafeNativeMethods.IErrorInfo errorInfo = null;
string message = String.Empty;
OleDbHResult errorInfoHr = UnsafeNativeMethods.GetErrorInfo(0, out errorInfo); // 0 - IErrorInfo exists, 1 - no IErrorInfo
if ((errorInfoHr == OleDbHResult.S_OK) && (errorInfo != null)) {
ODB.GetErrorDescription(errorInfo, lastErrorHr, out message);
// note that either GetErrorInfo or GetErrorDescription might fail in which case we will have only the HRESULT value in exception message
}
lastErrorFromProvider = new COMException(message, (int)lastErrorHr);
}
public override bool IsInvalid {
get {
return (IntPtr.Zero == base.handle);
}
}
override protected bool ReleaseHandle() {
// NOTE: The SafeHandle class guarantees this will be called exactly once and is non-interrutible.
IntPtr ptr = base.handle;
base.handle = IntPtr.Zero;
if (ADP.PtrZero != ptr) {
int count = this.propertySetCount;
for (int i = 0, offset = 0; i < count; ++i, offset += ODB.SizeOf_tagDBPROPSET) {
IntPtr rgProperties = Marshal.ReadIntPtr(ptr, offset);
if(ADP.PtrZero != rgProperties) {
int cProperties = Marshal.ReadInt32(ptr, offset + ADP.PtrSize);
IntPtr vptr = ADP.IntPtrOffset(rgProperties, ODB.OffsetOf_tagDBPROP_Value);
for (int k = 0; k < cProperties; ++k, vptr = ADP.IntPtrOffset(vptr, ODB.SizeOf_tagDBPROP)) {
SafeNativeMethods.VariantClear(vptr);
}
SafeNativeMethods.CoTaskMemFree(rgProperties);
}
}
SafeNativeMethods.CoTaskMemFree(ptr);
}
return true;
}
internal int PropertySetCount {
get {
return this.propertySetCount;
}
}
internal tagDBPROP[] GetPropertySet(int index, out Guid propertyset) {
if ((index < 0) || (PropertySetCount <= index)) {
if (lastErrorFromProvider != null)
{
// VSDD 621427: add extra error information for CSS/stress troubleshooting.
// We need to keep same exception type to avoid breaking change with Orcas RTM/SP1.
throw ADP.InternalError(ADP.InternalErrorCode.InvalidBuffer, lastErrorFromProvider);
}
else {
throw ADP.InternalError(ADP.InternalErrorCode.InvalidBuffer);
}
}
tagDBPROPSET propset = new tagDBPROPSET();
tagDBPROP[] properties = null;
bool mustRelease = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
DangerousAddRef(ref mustRelease);
IntPtr propertySetPtr = ADP.IntPtrOffset(DangerousGetHandle(), index * ODB.SizeOf_tagDBPROPSET);
Marshal.PtrToStructure(propertySetPtr, propset);
propertyset = propset.guidPropertySet;
properties = new tagDBPROP[propset.cProperties];
for(int i = 0; i < properties.Length; ++i) {
properties[i] = new tagDBPROP();
IntPtr ptr = ADP.IntPtrOffset(propset.rgProperties, i * ODB.SizeOf_tagDBPROP);
Marshal.PtrToStructure(ptr, properties[i]);
}
}
finally {
if (mustRelease) {
DangerousRelease();
}
}
return properties;
}
internal void SetPropertySet(int index, Guid propertySet, tagDBPROP[] properties) {
if ((index < 0) || (PropertySetCount <= index)) {
if (lastErrorFromProvider != null) {
// VSDD 621427: add extra error information for CSS/stress troubleshooting.
// We need to keep same exception type to avoid breaking change with Orcas RTM/SP1.
throw ADP.InternalError(ADP.InternalErrorCode.InvalidBuffer, lastErrorFromProvider);
}
else {
throw ADP.InternalError(ADP.InternalErrorCode.InvalidBuffer);
}
}
Debug.Assert(Guid.Empty != propertySet, "invalid propertySet");
Debug.Assert((null != properties) && (0 < properties.Length), "invalid properties");
IntPtr countOfBytes = (IntPtr)(properties.Length * ODB.SizeOf_tagDBPROP);
tagDBPROPSET propset = new tagDBPROPSET(properties.Length, propertySet);
bool mustRelease = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
DangerousAddRef(ref mustRelease);
IntPtr propsetPtr = ADP.IntPtrOffset(DangerousGetHandle(), index * ODB.SizeOf_tagDBPROPSET);
RuntimeHelpers.PrepareConstrainedRegions();
try {} finally {
// must allocate and clear the memory without interruption
propset.rgProperties = SafeNativeMethods.CoTaskMemAlloc(countOfBytes);
if (ADP.PtrZero != propset.rgProperties) {
// clearing is important so that we don't treat existing
// garbage as important information during releaseHandle
SafeNativeMethods.ZeroMemory(propset.rgProperties, countOfBytes);
// writing the structure to native memory so that it knows to free the referenced pointers
Marshal.StructureToPtr(propset, propsetPtr, false/*deleteold*/);
}
}
if (ADP.PtrZero == propset.rgProperties) {
throw new OutOfMemoryException();
}
for(int i = 0; i < properties.Length; ++i) {
Debug.Assert(null != properties[i], "null tagDBPROP " + i.ToString(CultureInfo.InvariantCulture));
IntPtr propertyPtr = ADP.IntPtrOffset(propset.rgProperties, i * ODB.SizeOf_tagDBPROP);
Marshal.StructureToPtr(properties[i], propertyPtr, false/*deleteold*/);
}
}
finally {
if (mustRelease) {
DangerousRelease();
}
}
}
static internal DBPropSet CreateProperty(Guid propertySet, int propertyId, bool required, object value) {
tagDBPROP dbprop = new tagDBPROP(propertyId, required, value);
DBPropSet propertyset = new DBPropSet(1);
propertyset.SetPropertySet(0, propertySet, new tagDBPROP[1] { dbprop });
return propertyset;
}
}
}
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