ProjectArcade

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.IO;
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namespace EmulatorLauncher.Common.FileFormats
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{
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    public class MultiDiskImageFile
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    {
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        public string[] Files { get; set; }
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        public static MultiDiskImageFile FromFile(string file)
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        {
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            var files = new List<string>();
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            string path = Path.GetDirectoryName(file);
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            string ext = Path.GetExtension(file).ToLowerInvariant();
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            if (ext == ".cue")
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            {
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                string start = "FILE";
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                foreach (var line in File.ReadAllLines(file))
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                {
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                    if (string.IsNullOrEmpty(line) || !line.StartsWith(start))
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                        continue;
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                    var tokens = getTokens(line);
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                    if (tokens.Length > 1)
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                        files.Add(Path.Combine(path, tokens[1]));
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                }
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            }
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            else if (ext == ".ccd")
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            {
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                string stem = Path.GetFileNameWithoutExtension(file);
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                files.Add(Path.Combine(path, stem + ".cue"));
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                files.Add(Path.Combine(path, stem + ".img"));
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                files.Add(Path.Combine(path, stem + ".bin"));
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                files.Add(Path.Combine(path, stem + ".sub"));
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            }
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            else if (ext == ".m3u")
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            {
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                foreach (var line in File.ReadAllLines(file))
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                {
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                    var trim = (line ?? "").Trim();
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                    if (string.IsNullOrEmpty(trim) || trim[0] == '#' || trim[0] == '\\' || trim[0] == '/')
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                        continue;
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                    files.Add(Path.Combine(path, trim));
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                }
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            }
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            else if (ext == ".gdi")
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            {
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                foreach (var line in File.ReadAllLines(file))
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                {
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                    var tokens = getTokens(line);
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                    if (tokens.Length > 5 && tokens[4].Contains("."))
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                        files.Add(Path.Combine(path, tokens[4]));
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                }
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            }
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            if (files.Any())
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                return new MultiDiskImageFile() { Files = files.ToArray() };
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            return null;
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        }
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        private static string[] getTokens(string line)
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        {
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            var tokens = new List<string>();
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            bool inString = false;
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            int startPos = 0;
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            int i = 0;
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            while(i < line.Length)
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            {
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                char c = line[i];
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                switch (c)
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                {
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                    case '\"':
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                        inString = !inString;
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                        if (inString)
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                            startPos = i + 1;
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                        if (!inString)
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                        {
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                            string value = line.Substring(startPos, i - startPos);
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                            if (!string.IsNullOrEmpty(value))
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                                tokens.Add(value);
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                            startPos = i + 1;
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                        }
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                        break;
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                    case '\0':
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                    case ' ':
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                    case '\t':
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                    case '\r':
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                    case '\n':
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                        if (!inString)
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                        {
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                            string value = line.Substring(startPos, i - startPos);
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                            if (!string.IsNullOrEmpty(value))
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                                tokens.Add(value);
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                            startPos = i + 1;
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                        }
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                        break;
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                }
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                if (c == '\0')
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                    break;
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                i++;
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            }
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            return tokens.ToArray();
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        }
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    }
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}
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