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281 lines
11 KiB
C#
281 lines
11 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : PCExchange.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Filters.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Provides a filter to open handle files written by PCExchange in FAT
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// volumes
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Globalization;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes.Interfaces;
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namespace DiscImageChef.Filters
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{
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/// <summary>
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/// Decodes PCExchange files
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/// </summary>
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public class PCExchange : IFilter
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{
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const string FILE_ID = "FILEID.DAT";
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const string FINDER_INFO = "FINDER.DAT";
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const string RESOURCES = "RESOURCE.FRK";
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string basePath;
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DateTime creationTime;
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long dataLen;
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string dataPath;
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DateTime lastWriteTime;
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bool opened;
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long rsrcLen;
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string rsrcPath;
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public string Name => "PCExchange";
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public Guid Id => new Guid("9264EB9F-D634-4F9B-BE12-C24CD44988C6");
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public string Author => "Natalia Portillo";
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public void Close()
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{
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opened = false;
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}
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public string GetBasePath() => basePath;
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public DateTime GetCreationTime() => creationTime;
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public long GetDataForkLength() => dataLen;
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public Stream GetDataForkStream() => new FileStream(dataPath, FileMode.Open, FileAccess.Read);
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public string GetFilename() => Path.GetFileName(basePath);
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public DateTime GetLastWriteTime() => lastWriteTime;
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public long GetLength() => dataLen + rsrcLen;
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public string GetParentFolder() => Path.GetDirectoryName(basePath);
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public string GetPath() => basePath;
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public long GetResourceForkLength() => rsrcLen;
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public Stream GetResourceForkStream() => new FileStream(rsrcPath, FileMode.Open, FileAccess.Read);
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public bool HasResourceFork() => rsrcPath != null;
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public bool Identify(byte[] buffer) => false;
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public bool Identify(Stream stream) => false;
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public bool Identify(string path)
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{
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string parentFolder = Path.GetDirectoryName(path);
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if(!File.Exists(Path.Combine(parentFolder ?? throw new InvalidOperationException(), FINDER_INFO)))
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return false;
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if(!Directory.Exists(Path.Combine(parentFolder, RESOURCES))) return false;
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string baseFilename = Path.GetFileName(path);
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bool dataFound = false;
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bool rsrcFound = false;
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FileStream finderDatStream =
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new FileStream(Path.Combine(parentFolder, FINDER_INFO), FileMode.Open, FileAccess.Read);
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while(finderDatStream.Position + 0x5C <= finderDatStream.Length)
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{
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PCExchangeEntry datEntry = new PCExchangeEntry();
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byte[] datEntry_b = new byte[Marshal.SizeOf(datEntry)];
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finderDatStream.Read(datEntry_b, 0, Marshal.SizeOf(datEntry));
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datEntry = BigEndianMarshal.ByteArrayToStructureBigEndian<PCExchangeEntry>(datEntry_b);
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// TODO: Add support for encoding on filters
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string macName =
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StringHandlers.PascalToString(datEntry.macName, Encoding.GetEncoding("macintosh"));
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byte[] tmpDosName_b = new byte[8];
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byte[] tmpDosExt_b = new byte[3];
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Array.Copy(datEntry.dosName, 0, tmpDosName_b, 0, 8);
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Array.Copy(datEntry.dosName, 8, tmpDosExt_b, 0, 3);
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string dosName = Encoding.ASCII.GetString(tmpDosName_b).Trim() + "." +
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Encoding.ASCII.GetString(tmpDosExt_b).Trim();
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string dosNameLow = dosName.ToLower(CultureInfo.CurrentCulture);
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if(baseFilename != macName && baseFilename != dosName && baseFilename != dosNameLow) continue;
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dataFound |=
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File.Exists(Path.Combine(parentFolder, macName ?? throw new InvalidOperationException())) ||
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File.Exists(Path.Combine(parentFolder, dosName)) ||
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File.Exists(Path.Combine(parentFolder, dosNameLow));
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rsrcFound |= File.Exists(Path.Combine(parentFolder, RESOURCES, dosName)) ||
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File.Exists(Path.Combine(parentFolder, RESOURCES, dosNameLow));
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break;
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}
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finderDatStream.Close();
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return dataFound && rsrcFound;
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}
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public bool IsOpened() => opened;
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public void Open(byte[] buffer)
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{
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throw new NotSupportedException();
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}
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public void Open(Stream stream)
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{
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throw new NotSupportedException();
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}
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public void Open(string path)
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{
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string parentFolder = Path.GetDirectoryName(path);
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string baseFilename = Path.GetFileName(path);
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FileStream finderDatStream =
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new FileStream(Path.Combine(parentFolder ?? throw new InvalidOperationException(), FINDER_INFO),
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FileMode.Open, FileAccess.Read);
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while(finderDatStream.Position + 0x5C <= finderDatStream.Length)
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{
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PCExchangeEntry datEntry = new PCExchangeEntry();
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byte[] datEntry_b = new byte[Marshal.SizeOf(datEntry)];
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finderDatStream.Read(datEntry_b, 0, Marshal.SizeOf(datEntry));
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datEntry = BigEndianMarshal.ByteArrayToStructureBigEndian<PCExchangeEntry>(datEntry_b);
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string macName =
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StringHandlers.PascalToString(datEntry.macName, Encoding.GetEncoding("macintosh"));
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byte[] tmpDosName_b = new byte[8];
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byte[] tmpDosExt_b = new byte[3];
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Array.Copy(datEntry.dosName, 0, tmpDosName_b, 0, 8);
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Array.Copy(datEntry.dosName, 8, tmpDosExt_b, 0, 3);
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string dosName = Encoding.ASCII.GetString(tmpDosName_b).Trim() + "." +
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Encoding.ASCII.GetString(tmpDosExt_b).Trim();
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string dosNameLow = dosName.ToLower(CultureInfo.CurrentCulture);
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if(baseFilename != macName && baseFilename != dosName && baseFilename != dosNameLow) continue;
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if(File.Exists(Path.Combine(parentFolder, macName ?? throw new InvalidOperationException())))
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dataPath = Path.Combine(parentFolder, macName);
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else if(File.Exists(Path.Combine(parentFolder, dosName)))
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dataPath = Path.Combine(parentFolder, dosName);
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else if(File.Exists(Path.Combine(parentFolder, dosNameLow)))
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dataPath = Path.Combine(parentFolder, dosNameLow);
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else dataPath = null;
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if(File.Exists(Path.Combine(parentFolder, RESOURCES, dosName)))
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rsrcPath = Path.Combine(parentFolder, RESOURCES, dosName);
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else if(File.Exists(Path.Combine(parentFolder, RESOURCES, dosNameLow)))
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rsrcPath = Path.Combine(parentFolder, RESOURCES, dosNameLow);
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else rsrcPath = null;
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lastWriteTime = DateHandlers.MacToDateTime(datEntry.modificationDate);
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creationTime = DateHandlers.MacToDateTime(datEntry.creationDate);
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break;
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}
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dataLen = new FileInfo(dataPath ?? throw new InvalidOperationException()).Length;
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rsrcLen = new FileInfo(rsrcPath ?? throw new InvalidOperationException()).Length;
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basePath = path;
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opened = true;
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finderDatStream.Close();
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct PCExchangeEntry
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{
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/// <summary>
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/// Name in Macintosh. If PCExchange version supports FAT's LFN they are the same.
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/// Illegal characters for FAT get substituted with '_' both here and in FAT's LFN entry.
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
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public byte[] macName;
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/// <summary>
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/// File type
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/// </summary>
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public uint type;
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/// <summary>
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/// File creator
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/// </summary>
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public uint creator;
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/// <summary>
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/// Finder flags
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/// </summary>
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public ushort fdFlags;
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/// <summary>
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/// File's icon vertical position within its window
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/// </summary>
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public ushort verticalPosition;
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/// <summary>
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/// File's icon horizontal position within its window
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/// </summary>
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public ushort horizontalPosition;
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/// <summary>
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/// Unknown, all bytes are empty but last, except in volume's label entry
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 18)]
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public byte[] unknown1;
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/// <summary>
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/// File's creation date
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/// </summary>
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public uint creationDate;
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/// <summary>
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/// File's modification date
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/// </summary>
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public uint modificationDate;
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/// <summary>
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/// File's last backup date
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/// </summary>
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public uint backupDate;
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/// <summary>
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/// Unknown, but is unique, starts 0x7FFFFFFF and counts in reverse.
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/// Probably file ID for alias look up?
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/// </summary>
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public uint unknown2;
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/// <summary>
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/// Name as in FAT entry (not LFN).
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/// Resource fork file is always using this name, never LFN.
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
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public byte[] dosName;
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/// <summary>
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/// Unknown, flags?
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/// </summary>
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public byte unknown3;
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}
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}
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} |