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/*
* Firebird ADO.NET Data provider for .NET and Mono
*
* The contents of this file are subject to the Initial
* Developer's Public License Version 1.0 (the "License");
* you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
* http://www.firebirdsql.org/index.php?op=doc&id=idpl
*
* Software distributed under the License is distributed on
* an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the License for the specific
* language governing rights and limitations under the License.
*
* Copyright (c) 2002, 2005 Carlos Guzman Alvarez
* All Rights Reserved.
*/
using System;
using System.Runtime.InteropServices;
using FirebirdSql.Data.Common;
namespace FirebirdSql.Data.Embedded
{
internal class ArrayDescMarshaler
{
#region Static Fields
private static ArrayDescMarshaler instance;
#endregion
#region Constructors
private ArrayDescMarshaler()
{
}
#endregion
#region Methods
public static ArrayDescMarshaler GetInstance()
{
if (ArrayDescMarshaler.instance == null)
{
ArrayDescMarshaler.instance = new ArrayDescMarshaler();
}
return ArrayDescMarshaler.instance;
}
public void CleanUpNativeData(ref IntPtr pNativeData)
{
if (pNativeData != IntPtr.Zero)
{
// Destroy ArrayDescMarshal structure
Marshal.DestroyStructure(pNativeData, typeof(ArrayDescMarshal));
// Destroy ArrayBound structures
for (int i = 0; i < 16; i++)
{
Marshal.DestroyStructure(
(IntPtr)(pNativeData.ToInt32() + ArrayDescMarshal.ComputeLength(i)),
typeof(ArrayBoundMarshal));
}
// Free pointer memory
Marshal.FreeHGlobal(pNativeData);
pNativeData = IntPtr.Zero;
}
}
public IntPtr MarshalManagedToNative(ArrayDesc descriptor)
{
ArrayDescMarshal arrayDesc = new ArrayDescMarshal();
arrayDesc.DataType = descriptor.DataType;
arrayDesc.Scale = (byte)descriptor.Scale;
arrayDesc.Length = descriptor.Length;
arrayDesc.FieldName = descriptor.FieldName;
arrayDesc.RelationName = descriptor.RelationName;
arrayDesc.Dimensions = descriptor.Dimensions;
arrayDesc.Flags = descriptor.Flags;
ArrayBoundMarshal[] arrayBounds = new ArrayBoundMarshal[descriptor.Bounds.Length];
for (int i = 0; i < descriptor.Dimensions; i++)
{
arrayBounds[i].LowerBound = (short)descriptor.Bounds[i].LowerBound;
arrayBounds[i].UpperBound = (short)descriptor.Bounds[i].UpperBound;
}
return this.MarshalManagedToNative(arrayDesc, arrayBounds);
}
public IntPtr MarshalManagedToNative(
ArrayDescMarshal arrayDesc,
ArrayBoundMarshal[] arrayBounds)
{
int size = ArrayDescMarshal.ComputeLength(arrayBounds.Length);
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(arrayDesc, ptr, true);
for (int i = 0; i < arrayBounds.Length; i++)
{
Marshal.StructureToPtr(
arrayBounds[i],
(IntPtr)(ptr.ToInt32() + ArrayDescMarshal.ComputeLength(i)),
true);
}
return ptr;
}
#endregion
}
}
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