Aaru/DiscImageChef.Filesystems/ISO9660/Xattr.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Xattr.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : ISO9660 filesystem plugin.
//
// --[ Description ] ----------------------------------------------------------
//
//     Handles extended attributes
//
// --[ 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 © 2011-2020 Natalia Portillo
// In the loving memory of Facunda "Tata" Suárez Domínguez, R.I.P. 2019/07/24
// ****************************************************************************/

using System;
using System.Collections.Generic;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Helpers;

namespace DiscImageChef.Filesystems.ISO9660
{
    public partial class ISO9660
    {
        public Errno ListXAttr(string path, out List<string> xattrs)
        {
            xattrs = null;

            if(!mounted)
                return Errno.AccessDenied;

            Errno err = GetFileEntry(path, out DecodedDirectoryEntry entry);

            if(err != Errno.NoError)
                return err;

            xattrs = new List<string>();

            if(entry.XattrLength > 0)
                xattrs.Add("org.iso.9660.ea");

            if(entry.AssociatedFile != null)
                xattrs.Add("org.iso.9660.AssociatedFile");

            if(entry.AppleDosType != null)
                xattrs.Add("com.apple.dos.type");

            if(entry.AppleProDosType != null)
                xattrs.Add("com.apple.prodos.type");

            if(entry.ResourceFork != null)
                xattrs.Add("com.apple.ResourceFork");

            if(entry.FinderInfo != null)
                xattrs.Add("com.apple.FinderInfo");

            if(entry.AppleIcon != null)
                xattrs.Add("com.apple.Macintosh.Icon");

            if(entry.AmigaComment != null)
                xattrs.Add("com.amiga.comments");

            return Errno.NoError;
        }

        public Errno GetXattr(string path, string xattr, ref byte[] buf)
        {
            buf = null;

            if(!mounted)
                return Errno.AccessDenied;

            Errno err = GetFileEntry(path, out DecodedDirectoryEntry entry);

            if(err != Errno.NoError)
                return err;

            switch(xattr)
            {
                case"org.iso.9660.ea":
                    if(entry.XattrLength == 0)
                        return Errno.NoSuchExtendedAttribute;

                    if(entry.Extents is null)
                        return Errno.InvalidArgument;

                    uint eaSizeInSectors = (uint)(entry.XattrLength / 2048);

                    if(entry.XattrLength % 2048 > 0)
                        eaSizeInSectors++;

                    byte[] ea = ReadSectors(entry.Extents[0].extent, eaSizeInSectors);

                    buf = new byte[entry.AssociatedFile.Size];
                    Array.Copy(ea, 0, buf, 0, buf.LongLength);

                    return Errno.NoError;
                case"org.iso.9660.AssociatedFile":
                    if(entry.AssociatedFile is null)
                        return Errno.NoSuchExtendedAttribute;

                    if(entry.AssociatedFile.Extents is null)
                        return Errno.InvalidArgument;

                    if(entry.AssociatedFile.Size == 0)
                    {
                        buf = new byte[0];

                        return Errno.NoError;
                    }

                    if(entry.AssociatedFile.Extents.Count == 1)
                    {
                        uint associatedFileSize = (uint)(entry.AssociatedFile.Size / 2048);

                        if(entry.AssociatedFile.Size % 2048 > 0)
                            associatedFileSize++;

                        byte[] buffer = ReadSectors(entry.AssociatedFile.Extents[0].extent, associatedFileSize);

                        buf = new byte[entry.AssociatedFile.Size];
                        Array.Copy(buffer, 0, buf, 0, buf.LongLength);
                    }
                    else
                        buf = ReadWithExtents(0, (long)entry.AssociatedFile.Size, entry.AssociatedFile.Extents);

                    return Errno.NoError;
                case"com.apple.dos.type":
                    if(entry.AppleDosType is null)
                        return Errno.NoSuchExtendedAttribute;

                    buf    = new byte[1];
                    buf[0] = entry.AppleDosType.Value;

                    return Errno.NoError;
                case"com.apple.prodos.type":
                    if(entry.AppleProDosType is null)
                        return Errno.NoSuchExtendedAttribute;

                    buf = BitConverter.GetBytes(entry.AppleProDosType.Value);

                    return Errno.NoError;
                case"com.apple.ResourceFork":
                    if(entry.ResourceFork is null)
                        return Errno.NoSuchExtendedAttribute;

                    if(entry.ResourceFork.Extents is null)
                        return Errno.InvalidArgument;

                    if(entry.ResourceFork.Size == 0)
                    {
                        buf = new byte[0];

                        return Errno.NoError;
                    }

                    if(entry.ResourceFork.Extents.Count == 1)
                    {
                        uint rsrcSizeInSectors = (uint)(entry.ResourceFork.Size / 2048);

                        if(entry.AssociatedFile.Size % 2048 > 0)
                            rsrcSizeInSectors++;

                        byte[] buffer = ReadSectors(entry.ResourceFork.Extents[0].extent, rsrcSizeInSectors);

                        buf = new byte[entry.ResourceFork.Size];
                        Array.Copy(buffer, 0, buf, 0, buf.LongLength);
                    }
                    else
                        buf = ReadWithExtents(0, (long)entry.ResourceFork.Size, entry.ResourceFork.Extents);

                    return Errno.NoError;
                case"com.apple.FinderInfo":
                    if(entry.FinderInfo is null)
                        return Errno.NoSuchExtendedAttribute;

                    buf = Marshal.StructureToByteArrayBigEndian(entry.FinderInfo.Value);

                    return Errno.NoError;
                case"com.apple.Macintosh.Icon":
                    if(entry.AppleIcon is null)
                        return Errno.NoSuchExtendedAttribute;

                    buf = new byte[entry.AppleIcon.Length];
                    Array.Copy(entry.AppleIcon, 0, buf, 0, entry.AppleIcon.Length);

                    return Errno.NoError;
                case"com.amiga.comments":
                    if(entry.AmigaComment is null)
                        return Errno.NoSuchExtendedAttribute;

                    buf = new byte[entry.AmigaComment.Length];
                    Array.Copy(entry.AmigaComment, 0, buf, 0, entry.AmigaComment.Length);

                    return Errno.NoError;
                default: return Errno.NoSuchExtendedAttribute;
            }
        }
    }
}