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GuidConverter.cs
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GuidConverter.cs
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/* Copyright 2010-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
namespace MongoDB.Bson
{
/// <summary>
/// A static class containing methods to convert to and from Guids and byte arrays in various byte orders.
/// </summary>
public static class GuidConverter
{
/// <summary>
/// Converts a byte array to a Guid.
/// </summary>
/// <param name="bytes">The byte array.</param>
/// <param name="representation">The representation of the Guid in the byte array.</param>
/// <returns>A Guid.</returns>
public static Guid FromBytes(byte[] bytes, GuidRepresentation representation)
{
if (bytes.Length != 16)
{
var message = string.Format("Length of byte array must be 16, not {0}.", bytes.Length);
throw new ArgumentException(message);
}
bytes = (byte[])bytes.Clone();
switch (representation)
{
case GuidRepresentation.CSharpLegacy:
break;
case GuidRepresentation.JavaLegacy:
Array.Reverse(bytes, 0, 8);
Array.Reverse(bytes, 8, 8);
Array.Reverse(bytes, 0, 4);
Array.Reverse(bytes, 4, 2);
Array.Reverse(bytes, 6, 2);
break;
case GuidRepresentation.PythonLegacy:
case GuidRepresentation.Standard:
Array.Reverse(bytes, 0, 4);
Array.Reverse(bytes, 4, 2);
Array.Reverse(bytes, 6, 2);
break;
case GuidRepresentation.Unspecified:
throw new InvalidOperationException("Unable to convert byte array to Guid because GuidRepresentation is Unspecified.");
default:
throw new BsonInternalException("Unexpected GuidRepresentation.");
}
return new Guid(bytes);
}
/// <summary>
/// Gets the sub type that corresponds to the guidRepresentation.
/// </summary>
/// <param name="guidRepresentation">The Guid representation.</param>
/// <returns>The sub type.</returns>
public static BsonBinarySubType GetSubType(GuidRepresentation guidRepresentation)
{
switch (guidRepresentation)
{
case GuidRepresentation.Standard:
return BsonBinarySubType.UuidStandard;
case GuidRepresentation.CSharpLegacy:
case GuidRepresentation.JavaLegacy:
case GuidRepresentation.PythonLegacy:
return BsonBinarySubType.UuidLegacy;
default:
throw new ArgumentException("Invalid GuidRepresentation.", nameof(guidRepresentation));
}
}
/// <summary>
/// Converts a Guid to a byte array.
/// </summary>
/// <param name="guid">The Guid.</param>
/// <param name="guidRepresentation">The representation of the Guid in the byte array.</param>
/// <returns>A byte array.</returns>
public static byte[] ToBytes(Guid guid, GuidRepresentation guidRepresentation)
{
var bytes = (byte[])guid.ToByteArray().Clone();
switch (guidRepresentation)
{
case GuidRepresentation.CSharpLegacy:
break;
case GuidRepresentation.JavaLegacy:
Array.Reverse(bytes, 0, 4);
Array.Reverse(bytes, 4, 2);
Array.Reverse(bytes, 6, 2);
Array.Reverse(bytes, 0, 8);
Array.Reverse(bytes, 8, 8);
break;
case GuidRepresentation.PythonLegacy:
case GuidRepresentation.Standard:
Array.Reverse(bytes, 0, 4);
Array.Reverse(bytes, 4, 2);
Array.Reverse(bytes, 6, 2);
break;
case GuidRepresentation.Unspecified:
throw new InvalidOperationException("Unable to convert Guid to byte array because GuidRepresentation is Unspecified.");
default:
throw new ArgumentException($"Invalid guidRepresentation: {guidRepresentation}.", nameof(guidRepresentation));
}
return bytes;
}
}
}