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DiscUtils: Fat: Fix an issue with no long path name support in the upstream library
This commit is contained in:
Gustave Monce
@@ -0,0 +1,210 @@
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//
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// Copyright (c) 2008-2011, Kenneth Bell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using DiscUtils.Streams;
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namespace DiscUtils.Fat
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{
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internal class DirectoryEntry
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{
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private readonly FatType _fatVariant;
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private readonly FatFileSystemOptions _options;
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private byte _attr;
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private ushort _creationDate;
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private ushort _creationTime;
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private byte _creationTimeTenth;
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private uint _fileSize;
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private ushort _firstClusterHi;
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private ushort _firstClusterLo;
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private ushort _lastAccessDate;
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private ushort _lastWriteDate;
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private ushort _lastWriteTime;
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internal DirectoryEntry(FatFileSystemOptions options, Stream stream, FatType fatVariant)
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{
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_options = options;
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_fatVariant = fatVariant;
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byte[] buffer = StreamUtilities.ReadExact(stream, 32);
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Load(buffer, 0);
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}
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internal DirectoryEntry(FatFileSystemOptions options, FileName name, FatAttributes attrs, FatType fatVariant)
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{
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_options = options;
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_fatVariant = fatVariant;
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Name = name;
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_attr = (byte)attrs;
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}
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internal DirectoryEntry(DirectoryEntry toCopy)
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{
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_options = toCopy._options;
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_fatVariant = toCopy._fatVariant;
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Name = toCopy.Name;
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_attr = toCopy._attr;
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_creationTimeTenth = toCopy._creationTimeTenth;
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_creationTime = toCopy._creationTime;
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_creationDate = toCopy._creationDate;
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_lastAccessDate = toCopy._lastAccessDate;
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_firstClusterHi = toCopy._firstClusterHi;
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_lastWriteTime = toCopy._lastWriteTime;
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_firstClusterLo = toCopy._firstClusterLo;
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_fileSize = toCopy._fileSize;
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}
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public FatAttributes Attributes
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{
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get { return (FatAttributes)_attr; }
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set { _attr = (byte)value; }
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}
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public DateTime CreationTime
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{
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get { return FileTimeToDateTime(_creationDate, _creationTime, _creationTimeTenth); }
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set { DateTimeToFileTime(value, out _creationDate, out _creationTime, out _creationTimeTenth); }
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}
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public int FileSize
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{
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get { return (int)_fileSize; }
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set { _fileSize = (uint)value; }
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}
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public uint FirstCluster
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{
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get
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{
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if (_fatVariant == FatType.Fat32)
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{
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return (uint)(_firstClusterHi << 16) | _firstClusterLo;
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}
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return _firstClusterLo;
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}
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set
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{
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if (_fatVariant == FatType.Fat32)
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{
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_firstClusterHi = (ushort)((value >> 16) & 0xFFFF);
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}
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_firstClusterLo = (ushort)(value & 0xFFFF);
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}
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}
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public DateTime LastAccessTime
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{
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get { return FileTimeToDateTime(_lastAccessDate, 0, 0); }
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set { DateTimeToFileTime(value, out _lastAccessDate); }
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}
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public DateTime LastWriteTime
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{
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get { return FileTimeToDateTime(_lastWriteDate, _lastWriteTime, 0); }
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set { DateTimeToFileTime(value, out _lastWriteDate, out _lastWriteTime); }
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}
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public FileName Name { get; set; }
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internal void WriteTo(Stream stream)
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{
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byte[] buffer = new byte[32];
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Name.GetBytes(buffer, 0);
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buffer[11] = _attr;
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buffer[13] = _creationTimeTenth;
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EndianUtilities.WriteBytesLittleEndian(_creationTime, buffer, 14);
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EndianUtilities.WriteBytesLittleEndian(_creationDate, buffer, 16);
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EndianUtilities.WriteBytesLittleEndian(_lastAccessDate, buffer, 18);
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EndianUtilities.WriteBytesLittleEndian(_firstClusterHi, buffer, 20);
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EndianUtilities.WriteBytesLittleEndian(_lastWriteTime, buffer, 22);
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EndianUtilities.WriteBytesLittleEndian(_lastWriteDate, buffer, 24);
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EndianUtilities.WriteBytesLittleEndian(_firstClusterLo, buffer, 26);
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EndianUtilities.WriteBytesLittleEndian(_fileSize, buffer, 28);
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stream.Write(buffer, 0, buffer.Length);
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}
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private static DateTime FileTimeToDateTime(ushort date, ushort time, byte tenths)
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{
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if (date == 0 || date == 0xFFFF)
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{
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// Return Epoch - this is an invalid date
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return FatFileSystem.Epoch;
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}
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int year = 1980 + ((date & 0xFE00) >> 9);
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int month = (date & 0x01E0) >> 5;
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int day = date & 0x001F;
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int hour = (time & 0xF800) >> 11;
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int minute = (time & 0x07E0) >> 5;
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int second = (time & 0x001F) * 2 + tenths / 100;
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int millis = tenths % 100 * 10;
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return new DateTime(year, month, day, hour, minute, second, millis);
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}
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private static void DateTimeToFileTime(DateTime value, out ushort date)
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{
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byte tenths;
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ushort time;
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DateTimeToFileTime(value, out date, out time, out tenths);
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}
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private static void DateTimeToFileTime(DateTime value, out ushort date, out ushort time)
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{
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byte tenths;
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DateTimeToFileTime(value, out date, out time, out tenths);
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}
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private static void DateTimeToFileTime(DateTime value, out ushort date, out ushort time, out byte tenths)
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{
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if (value.Year < 1980)
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{
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value = FatFileSystem.Epoch;
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}
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date =
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(ushort)((((value.Year - 1980) << 9) & 0xFE00) | ((value.Month << 5) & 0x01E0) | (value.Day & 0x001F));
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time =
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(ushort)(((value.Hour << 11) & 0xF800) | ((value.Minute << 5) & 0x07E0) | ((value.Second / 2) & 0x001F));
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tenths = (byte)(value.Second % 2 * 100 + value.Millisecond / 10);
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}
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private void Load(byte[] data, int offset)
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{
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Name = new FileName(data, offset);
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_attr = data[offset + 11];
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_creationTimeTenth = data[offset + 13];
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_creationTime = EndianUtilities.ToUInt16LittleEndian(data, offset + 14);
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_creationDate = EndianUtilities.ToUInt16LittleEndian(data, offset + 16);
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_lastAccessDate = EndianUtilities.ToUInt16LittleEndian(data, offset + 18);
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_firstClusterHi = EndianUtilities.ToUInt16LittleEndian(data, offset + 20);
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_lastWriteTime = EndianUtilities.ToUInt16LittleEndian(data, offset + 22);
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_lastWriteDate = EndianUtilities.ToUInt16LittleEndian(data, offset + 24);
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_firstClusterLo = EndianUtilities.ToUInt16LittleEndian(data, offset + 26);
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_fileSize = EndianUtilities.ToUInt32LittleEndian(data, offset + 28);
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}
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}
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}
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