DanhengServer-OpenSource/Common/Util/Extensions.cs

using System.Buffers.Binary;

namespace EggLink.DanhengServer.Util;

public static class Extensions
{
    public static string JoinFormat<T>(this IEnumerable<T> list, string separator,
                               string formatString)
    {
        formatString = string.IsNullOrWhiteSpace(formatString) ? "{0}" : formatString;
        return string.Join(separator,
                           list.Select(item => string.Format(formatString, item)));
    }
    public static void WriteConvID(this BinaryWriter bw, long convId)
    {
        //bw.Write(convId);
        bw.Write((int)(convId >> 32));
        bw.Write((int)(convId & 0xFFFFFFFF));
    }

    public static long GetNextAvailableIndex<T>(this SortedList<long, T> sortedList)
    {
        long key = 1;
        long count = sortedList.Count;
        long counter = 0;
        do
        {
            if (count == 0) break;
            long nextKeyInList = sortedList.Keys.ElementAt((Index)counter++);
            if (key != nextKeyInList) break;
            key = nextKeyInList + 1;
        } while (count != 1 && counter != count && key == sortedList.Keys.ElementAt((Index)counter));
        return key;
    }

    public static long AddNext<T>(this SortedList<long, T> sortedList, T item)
    {
        long key = sortedList.GetNextAvailableIndex();
        sortedList.Add(key, item);
        return key;
    }
    public static int ReadInt32BE(this BinaryReader br) => BinaryPrimitives.ReadInt32BigEndian(br.ReadBytes(sizeof(int)));
    public static uint ReadUInt32BE(this BinaryReader br) => BinaryPrimitives.ReadUInt32BigEndian(br.ReadBytes(sizeof(uint)));
    public static ushort ReadUInt16BE(this BinaryReader br) => BinaryPrimitives.ReadUInt16BigEndian(br.ReadBytes(sizeof(ushort)));
    public static void WriteUInt16BE(this BinaryWriter bw, ushort value)
    {
        Span<byte> data = stackalloc byte[sizeof(ushort)];
        BinaryPrimitives.WriteUInt16BigEndian(data, value);
        bw.Write(data);
    }
    public static void WriteInt32BE(this BinaryWriter bw, int value)
    {
        Span<byte> data = stackalloc byte[sizeof(int)];
        BinaryPrimitives.WriteInt32BigEndian(data, value);
        bw.Write(data);
    }
    public static void WriteUInt32BE(this BinaryWriter bw, uint value)
    {
        Span<byte> data = stackalloc byte[sizeof(uint)];
        BinaryPrimitives.WriteUInt32BigEndian(data, value);
        bw.Write(data);
    }

    public static void WriteUInt64BE(this BinaryWriter bw, ulong value)
    {
        Span<byte> data = stackalloc byte[sizeof(ulong)];
        BinaryPrimitives.WriteUInt64BigEndian(data, value);
        bw.Write(data);
    }
}