mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
136 lines
5.0 KiB
C#
136 lines
5.0 KiB
C#
// /***************************************************************************
|
||
// Aaru Data Preservation Suite
|
||
// ----------------------------------------------------------------------------
|
||
//
|
||
// Filename : Dir.cs
|
||
// Author(s) : Natalia Portillo <claunia@claunia.com>
|
||
//
|
||
// Component : CP/M filesystem plugin.
|
||
//
|
||
// --[ Description ] ----------------------------------------------------------
|
||
//
|
||
// Methods to show the CP/M filesystem directory.
|
||
//
|
||
// --[ 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 © 2011-2023 Natalia Portillo
|
||
// ****************************************************************************/
|
||
|
||
using System;
|
||
using System.Collections.Generic;
|
||
using System.Text;
|
||
using Aaru.CommonTypes.Enums;
|
||
using Aaru.Helpers;
|
||
|
||
namespace Aaru.Filesystems;
|
||
|
||
public sealed partial class CPM
|
||
{
|
||
/// <inheritdoc />
|
||
public ErrorNumber ReadDir(string path, out List<string> contents)
|
||
{
|
||
contents = null;
|
||
|
||
if(!_mounted)
|
||
return ErrorNumber.AccessDenied;
|
||
|
||
if(!string.IsNullOrEmpty(path) &&
|
||
string.Compare(path, "/", StringComparison.OrdinalIgnoreCase) != 0)
|
||
return ErrorNumber.NotSupported;
|
||
|
||
contents = new List<string>(_dirList);
|
||
|
||
return ErrorNumber.NoError;
|
||
}
|
||
|
||
/// <summary>
|
||
/// Checks that the given directory blocks follow the CP/M filesystem directory specification Corrupted
|
||
/// directories will fail. FAT directories will false positive if all files start with 0x05, and do not use full
|
||
/// extensions, for example: "σAFILE.GZ" (using code page 437)
|
||
/// </summary>
|
||
/// <returns>False if the directory does not follow the directory specification</returns>
|
||
/// <param name="directory">Directory blocks.</param>
|
||
bool CheckDir(byte[] directory)
|
||
{
|
||
try
|
||
{
|
||
if(directory == null)
|
||
return false;
|
||
|
||
int fileCount = 0;
|
||
|
||
for(int off = 0; off < directory.Length; off += 32)
|
||
{
|
||
DirectoryEntry entry = Marshal.ByteArrayToStructureLittleEndian<DirectoryEntry>(directory, off, 32);
|
||
|
||
if((entry.statusUser & 0x7F) < 0x20)
|
||
{
|
||
for(int f = 0; f < 8; f++)
|
||
if(entry.filename[f] < 0x20 &&
|
||
entry.filename[f] != 0x00)
|
||
return false;
|
||
|
||
for(int e = 0; e < 3; e++)
|
||
if(entry.extension[e] < 0x20 &&
|
||
entry.extension[e] != 0x00)
|
||
return false;
|
||
|
||
if(!ArrayHelpers.ArrayIsNullOrWhiteSpace(entry.filename))
|
||
fileCount++;
|
||
}
|
||
else
|
||
switch(entry.statusUser)
|
||
{
|
||
case 0x20:
|
||
{
|
||
for(int f = 0; f < 8; f++)
|
||
if(entry.filename[f] < 0x20 &&
|
||
entry.filename[f] != 0x00)
|
||
return false;
|
||
|
||
for(int e = 0; e < 3; e++)
|
||
if(entry.extension[e] < 0x20 &&
|
||
entry.extension[e] != 0x00)
|
||
return false;
|
||
|
||
_label = Encoding.ASCII.GetString(directory, off + 1, 11).Trim();
|
||
_labelCreationDate = new byte[4];
|
||
_labelUpdateDate = new byte[4];
|
||
Array.Copy(directory, off + 24, _labelCreationDate, 0, 4);
|
||
Array.Copy(directory, off + 28, _labelUpdateDate, 0, 4);
|
||
|
||
break;
|
||
}
|
||
case 0x21 when directory[off + 1] == 0x00:
|
||
_thirdPartyTimestamps = true;
|
||
|
||
break;
|
||
case 0x21:
|
||
_standardTimestamps |= directory[off + 21] == 0x00 && directory[off + 31] == 0x00;
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
return fileCount > 0;
|
||
}
|
||
catch
|
||
{
|
||
return false;
|
||
}
|
||
}
|
||
} |