ZipFileUtils.cs

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using System.Buffers;
using System.Collections.Generic;
 
namespace System.IO.Compression;
 
internal static class ZipFileUtils
{
    public static string EntryFromPath(string entry, int offset, int length, ref char[] buffer, bool appendPathSeparator = false)
    {
        while (length > 0 && (entry[offset] == Path.DirectorySeparatorChar || entry[offset] == Path.AltDirectorySeparatorChar))
        {
            offset++;
            length--;
        }
        if (length == 0)
        {
            if (!appendPathSeparator)
            {
                return string.Empty;
            }
            return "/";
        }
        int num = (appendPathSeparator ? (length + 1) : length);
        EnsureCapacity(ref buffer, num);
        entry.CopyTo(offset, buffer, 0, length);
        for (int i = 0; i < length; i++)
        {
            char c = buffer[i];
            if (c == Path.DirectorySeparatorChar || c == Path.AltDirectorySeparatorChar)
            {
                buffer[i] = '/';
            }
        }
        if (appendPathSeparator)
        {
            buffer[length] = '/';
        }
        return new string(buffer, 0, num);
    }
 
    public static void EnsureCapacity(ref char[] buffer, int min)
    {
        if (buffer.Length < min)
        {
            int num = buffer.Length * 2;
            if (num < min)
            {
                num = min;
            }
            char[] array = buffer;
            buffer = ArrayPool<char>.Shared.Rent(num);
            ArrayPool<char>.Shared.Return(array);
        }
    }
 
    public static bool IsDirEmpty(DirectoryInfo possiblyEmptyDir)
    {
        using IEnumerator<string> enumerator = Directory.EnumerateFileSystemEntries(possiblyEmptyDir.FullName).GetEnumerator();
        return !enumerator.MoveNext();
    }
}