diff options
Diffstat (limited to 'src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs')
-rw-r--r-- | src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs b/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs new file mode 100644 index 0000000000..8ff0e045ca --- /dev/null +++ b/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs @@ -0,0 +1,46 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +namespace System.IO +{ + /// <summary>Provides methods to help in the implementation of Stream-derived types.</summary> + internal static partial class StreamHelpers + { + /// <summary>Validate the arguments to CopyTo, as would Stream.CopyTo.</summary> + public static void ValidateCopyToArgs(Stream source, Stream destination, int bufferSize) + { + if (destination == null) + { + throw new ArgumentNullException(nameof(destination)); + } + + if (bufferSize <= 0) + { + throw new ArgumentOutOfRangeException(nameof(bufferSize), bufferSize, Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum")); + } + + bool sourceCanRead = source.CanRead; + if (!sourceCanRead && !source.CanWrite) + { + throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_StreamClosed")); + } + + bool destinationCanWrite = destination.CanWrite; + if (!destinationCanWrite && !destination.CanRead) + { + throw new ObjectDisposedException(nameof(destination), Environment.GetResourceString("ObjectDisposed_StreamClosed")); + } + + if (!sourceCanRead) + { + throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnreadableStream")); + } + + if (!destinationCanWrite) + { + throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnwritableStream")); + } + } + } +} |