ISCSIConsole-Fork/DiskAccessLibrary/Mod/DiskImage.cs

using System;
using System.IO;
using System.Text;
using static DiskAccessLibrary.Mod.Consts;

namespace DiskAccessLibrary
{
    public abstract partial class DiskImage
    {
        public static string GetDiskImageInfo(string path)
        {
            if (path == null) throw new ArgumentNullException(nameof(path));

            var info = new StringBuilder();
            if (false == File.Exists(path))
            {
                info.AppendLine("** File not found **");
            }
            else
            {
                var extension = System.IO.Path.GetExtension(path).ToLower();
                switch (extension)
                {
                    default:
                        info.AppendLine($"No info for extension {extension}");
                        break;
                    case ".img":
                        var rawLength = new FileInfo(path).Length;
                        info.AppendLine("Raw Disk Image");
                        info.AppendLine($"Size:  {rawLength / MegaByte:N0} MB");
                        break;
                    case ".bdd":
                        info.AppendLine("Block Differencing Disk Image");
                        var bdd = new BddInfo(path, false);

                        if (null == bdd.BasedImagePath)
                        {
                            info.AppendLine("** No Base Image Mode **");
                        }
                        else
                        {
                            if (false == File.Exists(bdd.BasedImagePath))
                            {
                                info.AppendLine("** Based image file not found **");
                                info.AppendLine($"Based on: {bdd.BasedImagePath}");
                                break;
                            }

                            long baseLength;
                            using (var fs = new FileStream(bdd.BasedImagePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                                baseLength = fs.Length;

                            info.AppendLine($"Based on:    {bdd.BasedImagePath}");
                            info.AppendLine($"Based Size:  {baseLength / MegaByte:N0} MB");
                            if (baseLength != bdd.Length)
                            {
                                info.AppendLine("** Fully Size not match to base **");
                                break;
                            }
                        }

                        info.AppendLine($"Block Size:  {bdd.BlockSize / KiloByte:N0} KB");
                        info.AppendLine($"Block Count: {bdd.NumberOfBlocks:N0}");
                        info.AppendLine($"Fully Size:  {bdd.Length / MegaByte:N0} MB");

                        break;
                }
            }

            return info.ToString();
        }
    }
}