Adds support for cram filesystem, closes #24

DiscImageChef.Filesystems/Cram.cs

@@ -0,0 +1,205 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Cram.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Cram file system plugin.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Identifies the Cram file system and shows information.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2016 Natalia Portillo
+// ****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Security.Policy;
+
+namespace DiscImageChef.Filesystems
+{
+    class Cram : Filesystem
+    {
+        public Cram()
+        {
+            Name = "Cram filesystem";
+            PluginUUID = new Guid("F8F6E46F-7A2A-48E3-9C0A-46AF4DC29E09");
+        }
+
+        public Cram(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd)
+        {
+            Name = "Cram filesystem";
+            PluginUUID = new Guid("F8F6E46F-7A2A-48E3-9C0A-46AF4DC29E09");
+        }
+
+        enum CramCompression : ushort
+        {
+            Zlib = 1,
+            Lzma = 2,
+            Lzo = 3,
+            Xz = 4,
+            Lz4 = 5
+        }
+
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        struct CramSuperBlock
+        {
+            public uint magic;
+            public uint size;
+            public uint flags;
+            public uint future;
+            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
+            public byte[] signature;
+            public uint crc;
+            public uint edition;
+            public uint blocks;
+            public uint files;
+            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
+            public byte[] name;
+        }
+
+        /// <summary>
+        /// Identifier for Cram
+        /// </summary>
+        const uint Cram_MAGIC = 0x28CD3D45;
+        const uint Cram_CIGAM = 0x453DCD28;
+
+        public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd)
+        {
+            if(partitionStart >= partitionEnd)
+                return false;
+
+            byte[] sector = imagePlugin.ReadSector(partitionStart);
+
+            uint magic = BitConverter.ToUInt32(sector, 0x00);
+
+            return magic == Cram_MAGIC || magic == Cram_CIGAM;
+        }
+
+        public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionStart, ulong partitionEnd, out string information)
+        {
+            byte[] sector = imagePlugin.ReadSector(partitionStart);
+            uint magic = BitConverter.ToUInt32(sector, 0x00);
+
+            CramSuperBlock crSb = new CramSuperBlock();
+            bool littleEndian = true;
+
+            if(magic == Cram_MAGIC)
+            {
+                IntPtr crSbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(crSb));
+                Marshal.Copy(sector, 0, crSbPtr, Marshal.SizeOf(crSb));
+                crSb = (CramSuperBlock)Marshal.PtrToStructure(crSbPtr, typeof(CramSuperBlock));
+                Marshal.FreeHGlobal(crSbPtr);
+            }
+            else if(magic == Cram_CIGAM)
+            {
+                crSb = BigEndianMarshal.ByteArrayToStructureBigEndian<CramSuperBlock>(sector);
+                littleEndian = false;
+            }
+
+            StringBuilder sbInformation = new StringBuilder();
+
+            sbInformation.AppendLine("Cram file system");
+            if(littleEndian)
+                sbInformation.AppendLine("Little-endian");
+            else
+                sbInformation.AppendLine("Big-endian");
+            sbInformation.AppendFormat("Volume edition {0}", crSb.edition).AppendLine();
+            sbInformation.AppendFormat("Volume name: {0}", StringHandlers.CToString(crSb.name)).AppendLine();
+            sbInformation.AppendFormat("Volume has {0} bytes", crSb.size).AppendLine();
+            sbInformation.AppendFormat("Volume has {0} blocks", crSb.blocks).AppendLine();
+            sbInformation.AppendFormat("Volume has {0} files", crSb.files).AppendLine();
+
+            information = sbInformation.ToString();
+
+            xmlFSType = new Schemas.FileSystemType();
+            xmlFSType.VolumeName = StringHandlers.CToString(crSb.name);
+            xmlFSType.Type = "Cram file system";
+            xmlFSType.Clusters = crSb.blocks;
+            xmlFSType.Files = crSb.files;
+            xmlFSType.FilesSpecified = true;
+            xmlFSType.FreeClusters = 0;
+            xmlFSType.FreeClustersSpecified = true;
+        }
+
+        public override Errno Mount()
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno Mount(bool debug)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno Unmount()
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno MapBlock(string path, long fileBlock, ref long deviceBlock)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno GetAttributes(string path, ref FileAttributes attributes)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno ListXAttr(string path, ref List<string> xattrs)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno GetXattr(string path, string xattr, ref byte[] buf)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno Read(string path, long offset, long size, ref byte[] buf)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno ReadDir(string path, ref List<string> contents)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno StatFs(ref FileSystemInfo stat)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno Stat(string path, ref FileEntryInfo stat)
+        {
+            return Errno.NotImplemented;
+        }
+
+        public override Errno ReadLink(string path, ref string dest)
+        {
+            return Errno.NotImplemented;
+        }
+    }
+}

DiscImageChef.Filesystems/DiscImageChef.Filesystems.csproj

@@ -110,6 +110,7 @@
     <Compile Include="VMfs.cs" />
     <Compile Include="VxFS.cs" />
     <Compile Include="Squash.cs" />
+    <Compile Include="Cram.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

README.md

@@ -136,6 +136,7 @@ Supported file systems for identification and information only
 * VMware file system (VMFS)
 * Veritas file system
 * Squash file system
+* Cram file system
 
 Supported checksums
 ===================

TODO

@@ -13,7 +13,6 @@ Filesystem plugins:
 --- Add support for CBM filesystem
 --- Add support for ZFS
 --- Add support for UDF
---- Add support for CramFS
 --- Add support for NwFS
 --- Add support for X-Box filesystems
 --- Add support for ReFS