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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
namespace Grpc.Core.Internal
{
/// <summary>
/// grpc_metadata_array from <grpc/grpc.h>
/// </summary>
internal class MetadataArraySafeHandle : SafeHandleZeroIsInvalid
{
[DllImport("grpc_csharp_ext.dll")]
static extern MetadataArraySafeHandle grpcsharp_metadata_array_create(UIntPtr capacity);
[DllImport("grpc_csharp_ext.dll", CharSet = CharSet.Ansi)]
static extern void grpcsharp_metadata_array_add(MetadataArraySafeHandle array, string key, byte[] value, UIntPtr valueLength);
[DllImport("grpc_csharp_ext.dll")]
static extern UIntPtr grpcsharp_metadata_array_count(IntPtr metadataArray);
[DllImport("grpc_csharp_ext.dll")]
static extern IntPtr grpcsharp_metadata_array_get_key(IntPtr metadataArray, UIntPtr index);
[DllImport("grpc_csharp_ext.dll")]
static extern IntPtr grpcsharp_metadata_array_get_value(IntPtr metadataArray, UIntPtr index);
[DllImport("grpc_csharp_ext.dll")]
static extern UIntPtr grpcsharp_metadata_array_get_value_length(IntPtr metadataArray, UIntPtr index);
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_metadata_array_destroy_full(IntPtr array);
private MetadataArraySafeHandle()
{
}
public static MetadataArraySafeHandle Create(Metadata metadata)
{
// TODO(jtattermusch): we might wanna check that the metadata is readonly
var metadataArray = grpcsharp_metadata_array_create(new UIntPtr((ulong)metadata.Count));
for (int i = 0; i < metadata.Count; i++)
{
grpcsharp_metadata_array_add(metadataArray, metadata[i].Key, metadata[i].ValueBytes, new UIntPtr((ulong)metadata[i].ValueBytes.Length));
}
return metadataArray;
}
/// <summary>
/// Reads metadata from pointer to grpc_metadata_array
/// </summary>
public static Metadata ReadMetadataFromPtrUnsafe(IntPtr metadataArray)
{
if (metadataArray == IntPtr.Zero)
{
return null;
}
ulong count = grpcsharp_metadata_array_count(metadataArray).ToUInt64();
var metadata = new Metadata();
for (ulong i = 0; i < count; i++)
{
var index = new UIntPtr(i);
string key = Marshal.PtrToStringAnsi(grpcsharp_metadata_array_get_key(metadataArray, index));
var bytes = new byte[grpcsharp_metadata_array_get_value_length(metadataArray, index).ToUInt64()];
Marshal.Copy(grpcsharp_metadata_array_get_value(metadataArray, index), bytes, 0, bytes.Length);
metadata.Add(new Metadata.Entry(key, bytes));
}
return metadata;
}
internal IntPtr Handle
{
get
{
return handle;
}
}
protected override bool ReleaseHandle()
{
grpcsharp_metadata_array_destroy_full(handle);
return true;
}
}
}
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