Quasar/Server/Core/Helper/Helper.cs

using System;
using System.Drawing;
using System.IO;

namespace Core
{
    class Helper
    {
        private const string CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        private static Random _rnd = new Random(Environment.TickCount);

        public static string GetRandomFilename(int length, string extension)
        {
            char[] tempChars = new char[length];
            for (int i = 0; i < length; i++)
                tempChars[i] = CHARS[_rnd.Next(CHARS.Length)];

            return new string(tempChars) + extension;
        }

        public static string GetRandomName(int length)
        {
            char[] tempChars = new char[length];
            for (int i = 0; i < length; i++)
                tempChars[i] = CHARS[_rnd.Next(CHARS.Length)];

            return new string(tempChars);
        }

        public static Image CByteToImg(byte[] img)
        {
            MemoryStream ms = new MemoryStream(img, 0, img.Length);
            ms.Write(img, 0, img.Length);
            return Image.FromStream(ms, true);
        }

        public static string GetFileSize(long size)
        {
            string[] sizes = { "B", "KB", "MB", "GB" };
            double len = size;
            int order = 0;
            while (len >= 1024 && order + 1 < sizes.Length)
            {
                order++;
                len = len / 1024;
            }
            return string.Format("{0:0.##} {1}", len, sizes[order]);
        }

        public static int GetFileIcon(string Extension)
        {
            if (!string.IsNullOrEmpty(Extension))
            {
                switch (Extension.ToLower())
                {
                    default:
                        return 2;
                    case ".exe":
                        return 3;
                    case ".txt":
                        return 4;
                    case ".rar":
                    case ".zip":
                    case ".zipx":
                    case ".tar":
                    case ".tgz":
                    case ".s7z":
                    case ".7z":
                    case ".bz2":
                    case ".cab":
                    case ".zz":
                        return 5;
                    case ".doc":
                    case ".docx":
                    case ".odt":
                        return 6;
                    case ".pdf":
                        return 7;
                    case ".jpg":
                    case ".jpeg":
                    case ".png":
                    case ".bmp":
                    case ".gif":
                        return 8;
                    case ".mp4":
                    case ".mov":
                    case ".avi":
                    case ".wmv":
                        return 9;
                    case ".mp3":
                    case ".wav":
                        return 10;
                }
            }
            else
                return 2;
        }
    }
}