Aaru/Aaru.Helpers/ArrayFill.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : ArrayFill.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Helpers.
//
// --[ Description ] ----------------------------------------------------------
//
//     Fills an array with a specified value.
//
// --[ License ] --------------------------------------------------------------
//
//     No license specified by creator.
//
//     Published on https://github.com/mykohsu/Extensions/blob/master/ArrayExtensions.cs
//
//     Assuming open source.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2023 Natalia Portillo
// Copyright(C) 2014 mykohsu
// ****************************************************************************/

using System;
using System.Text;

namespace Aaru.Helpers;

public static partial class ArrayHelpers
{
    /// <summary>Fills an array with the specified value</summary>
    /// <param name="destinationArray">Array</param>
    /// <param name="value">Value</param>
    /// <typeparam name="T">Array type</typeparam>
    public static void ArrayFill<T>(T[] destinationArray, T value) => ArrayFill(destinationArray, new[]
    {
        value
    });

    /// <summary>Fills an array with the contents of the specified array</summary>
    /// <param name="destinationArray">Array</param>
    /// <param name="value">Value</param>
    /// <typeparam name="T">Array type</typeparam>
    public static void ArrayFill<T>(T[] destinationArray, T[] value)
    {
        ArgumentNullException.ThrowIfNull(destinationArray);

        if(value.Length > destinationArray.Length)
            throw new ArgumentException(Localization.Length_of_value_array_must_not_be_more_than_length_of_destination);

        // set the initial array value
        Array.Copy(value, destinationArray, value.Length);

        int arrayToFillHalfLength = destinationArray.Length / 2;
        int copyLength;

        for(copyLength = value.Length; copyLength < arrayToFillHalfLength; copyLength <<= 1)
            Array.Copy(destinationArray, 0, destinationArray, copyLength, copyLength);

        Array.Copy(destinationArray, 0, destinationArray, copyLength, destinationArray.Length - copyLength);
    }

    /// <summary>Converts a byte array to its hexadecimal representation</summary>
    /// <param name="array">Byte array</param>
    /// <param name="upper"><c>true</c> to use uppercase</param>
    /// <returns></returns>
    public static string ByteArrayToHex(byte[] array, bool upper = false)
    {
        var sb = new StringBuilder();

        for(long i = 0; i < array.LongLength; i++)
            sb.Append($"{array[i]:x2}");

        return upper ? sb.ToString().ToUpper() : sb.ToString();
    }
}