// 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.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.IO;
 
namespace Microsoft.CodeAnalysis.Test.Utilities
{
    /// <summary>
    /// The collection of extension methods for the <see cref="ImmutableArray{T}"/> type
    /// </summary>
    public static class ImmutableArrayTestExtensions
    {
        private const int BufferSize = 4096;
 
        /// <summary>
        /// Writes read-only array of bytes to the specified file.
        /// </summary>
        /// <param name="bytes">Data to write to the file.</param>
        /// <param name="path">File path.</param>
        internal static void WriteToFile(this ImmutableArray<byte> bytes, string path)
        {
            using var fileStream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, BufferSize);
            WriteToStream(bytes, fileStream);
        }
 
        internal static void WriteToStream(this ImmutableArray<byte> bytes, Stream stream)
        {
            const int bufferSize = 4096;
 
            // PERF: Consider using an ObjectPool<byte[]> here
            var buffer = new byte[Math.Min(bufferSize, bytes.Length)];
 
            int offset = 0;
            while (offset < bytes.Length)
            {
                int length = Math.Min(bufferSize, bytes.Length - offset);
                bytes.CopyTo(offset, buffer, 0, length);
                stream.Write(buffer, 0, length);
                offset += length;
            }
        }
    }
}