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/* Copyright 2015 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
namespace Org.Brotli.Dec
{
/// <summary>A set of utility methods.</summary>
internal sealed class Utils
{
private static readonly byte[] ByteZeroes = new byte[1024];
private static readonly int[] IntZeroes = new int[1024];
/// <summary>Fills byte array with zeroes.</summary>
/// <remarks>
/// Fills byte array with zeroes.
/// <p> Current implementation uses
/// <see cref="System.Array.Copy(object, int, object, int, int)"/>
/// , so it should be used for length not
/// less than 16.
/// </remarks>
/// <param name="dest">array to fill with zeroes</param>
/// <param name="offset">the first byte to fill</param>
/// <param name="length">number of bytes to change</param>
internal static void FillWithZeroes(byte[] dest, int offset, int length)
{
int cursor = 0;
while (cursor < length)
{
int step = System.Math.Min(cursor + 1024, length) - cursor;
System.Array.Copy(ByteZeroes, 0, dest, offset + cursor, step);
cursor += step;
}
}
/// <summary>Fills int array with zeroes.</summary>
/// <remarks>
/// Fills int array with zeroes.
/// <p> Current implementation uses
/// <see cref="System.Array.Copy(object, int, object, int, int)"/>
/// , so it should be used for length not
/// less than 16.
/// </remarks>
/// <param name="dest">array to fill with zeroes</param>
/// <param name="offset">the first item to fill</param>
/// <param name="length">number of item to change</param>
internal static void FillWithZeroes(int[] dest, int offset, int length)
{
int cursor = 0;
while (cursor < length)
{
int step = System.Math.Min(cursor + 1024, length) - cursor;
System.Array.Copy(IntZeroes, 0, dest, offset + cursor, step);
cursor += step;
}
}
}
}
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