Aaru.Server/FileSystemIDandChk/Plugins/extFS.cs

using System;
using System.IO;
using System.Text;
using FileSystemIDandChk;

namespace FileSystemIDandChk.Plugins
{
	class extFS : Plugin
	{
		public extFS(PluginBase Core)
        {
            base.Name = "Linux extended Filesystem";
			base.PluginUUID = new Guid("076CB3A2-08C2-4D69-BC8A-FCAA2E502BE2");
        }
		
		public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset)
		{
			byte[] sb_sector = imagePlugin.ReadSector (2 + partitionOffset); // Superblock resides at 0x400

			UInt16 magic = BitConverter.ToUInt16(sb_sector, 0x038); // Here should reside magic number
			
			if(magic == extFSMagic)
				return true;
			else
				return false;
		}
		
		public override void GetInformation (ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset, out string information)
		{
			information = "";
			
			StringBuilder sb = new StringBuilder();

			byte[] sb_sector = imagePlugin.ReadSector (2 + partitionOffset); // Superblock resides at 0x400
			extFSSuperBlock ext_sb = new extFSSuperBlock();

			ext_sb.inodes = BitConverter.ToUInt32(sb_sector, 0x000);
			ext_sb.zones = BitConverter.ToUInt32(sb_sector, 0x004);
			ext_sb.firstfreeblk = BitConverter.ToUInt32(sb_sector, 0x008);
			ext_sb.freecountblk = BitConverter.ToUInt32(sb_sector, 0x00C);
			ext_sb.firstfreeind = BitConverter.ToUInt32(sb_sector, 0x010);
			ext_sb.freecountind = BitConverter.ToUInt32(sb_sector, 0x014);
			ext_sb.firstdatazone = BitConverter.ToUInt32(sb_sector, 0x018);
			ext_sb.logzonesize = BitConverter.ToUInt32(sb_sector, 0x01C);
			ext_sb.maxsize = BitConverter.ToUInt32(sb_sector, 0x020);

			sb.AppendLine("ext filesystem");
			sb.AppendFormat("{0} zones on volume", ext_sb.zones);
			sb.AppendFormat("{0} free blocks ({1} bytes)", ext_sb.freecountblk, ext_sb.freecountblk*1024);
			sb.AppendFormat("{0} inodes on volume, {1} free ({2}%)", ext_sb.inodes, ext_sb.freecountind, ext_sb.freecountind*100/ext_sb.inodes);
			sb.AppendFormat("First free inode is {0}", ext_sb.firstfreeind);
			sb.AppendFormat("First free block is {0}", ext_sb.firstfreeblk);
			sb.AppendFormat("First data zone is {0}", ext_sb.firstdatazone);
			sb.AppendFormat("Log zone size: {0}", ext_sb.logzonesize);
			sb.AppendFormat("Max zone size: {0}", ext_sb.maxsize);

			information = sb.ToString();
		}

		public const UInt16 extFSMagic = 0x137D;

		public struct extFSSuperBlock
		{
			public UInt32 inodes;        // 0x000, inodes on volume
			public UInt32 zones;         // 0x004, zones on volume
			public UInt32 firstfreeblk;  // 0x008, first free block
			public UInt32 freecountblk;  // 0x00C, free blocks count
			public UInt32 firstfreeind;  // 0x010, first free inode
			public UInt32 freecountind;  // 0x014, free inodes count
			public UInt32 firstdatazone; // 0x018, first data zone
			public UInt32 logzonesize;   // 0x01C, log zone size
			public UInt32 maxsize;       // 0x020, max zone size
			public UInt32 reserved1;     // 0x024, reserved
			public UInt32 reserved2;     // 0x028, reserved
			public UInt32 reserved3;     // 0x02C, reserved
			public UInt32 reserved4;     // 0x030, reserved
			public UInt32 reserved5;     // 0x034, reserved
			public UInt16 magic;         // 0x038, 0x137D (little endian)
		}
	}
}