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Implement LFN namespace in FAT.

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This commit is contained in:
Natalia Portillo
2019-04-27 13:04:59 +01:00
parent 511378a6be
commit c12b0d91db
6 changed files with 138 additions and 14 deletions
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56
DiscImageChef.Filesystems/FAT/Dir.cs
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@@ -34,6 +34,7 @@ using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Helpers;
@@ -118,18 +119,47 @@ namespace DiscImageChef.Filesystems.FAT
}
currentDirectory = new Dictionary<string, DirectoryEntry>();
byte[] lastLfnName = null;
byte lastLfnChecksum = 0;
int pos = 0;
while(pos < directoryBuffer.Length)
for(int pos = 0; pos < directoryBuffer.Length; pos += Marshal.SizeOf<DirectoryEntry>())
{
DirectoryEntry dirent =
Marshal.ByteArrayToStructureLittleEndian<DirectoryEntry>(directoryBuffer, pos,
Marshal.SizeOf<DirectoryEntry>());
pos += Marshal.SizeOf<DirectoryEntry>();
if(dirent.filename[0] == DIRENT_FINISHED) break;
if(dirent.attributes.HasFlag(FatAttributes.LFN))
{
if(@namespace != Namespace.Lfn) continue;
LfnEntry lfnEntry =
Marshal.ByteArrayToStructureLittleEndian<LfnEntry>(directoryBuffer, pos,
Marshal.SizeOf<LfnEntry>());
int lfnSequence = lfnEntry.sequence & LFN_MASK;
if((lfnEntry.sequence & LFN_ERASED) > 0) continue;
if((lfnEntry.sequence & LFN_LAST) > 0)
{
lastLfnName = new byte[lfnSequence * 26];
lastLfnChecksum = lfnEntry.checksum;
}
if(lastLfnName is null) continue;
if(lfnEntry.checksum != lastLfnChecksum) continue;
lfnSequence--;
Array.Copy(lfnEntry.name1, 0, lastLfnName, lfnSequence * 26, 10);
Array.Copy(lfnEntry.name2, 0, lastLfnName, lfnSequence * 26 + 10, 12);
Array.Copy(lfnEntry.name3, 0, lastLfnName, lfnSequence * 26 + 22, 4);
continue;
}
// Not a correct entry
if(dirent.filename[0] < DIRENT_MIN && dirent.filename[0] != DIRENT_E5) continue;
@@ -142,13 +172,25 @@ namespace DiscImageChef.Filesystems.FAT
// Deleted
if(dirent.filename[0] == DIRENT_DELETED) continue;
// TODO: LFN namespace
if(dirent.attributes.HasFlag(FatAttributes.LFN)) continue;
string filename;
if(dirent.attributes.HasFlag(FatAttributes.VolumeLabel)) continue;
if(@namespace == Namespace.Lfn && lastLfnName != null)
{
byte calculatedLfnChecksum = LfnChecksum(dirent.filename, dirent.extension);
if(calculatedLfnChecksum == lastLfnChecksum)
{
filename = StringHandlers.CToString(lastLfnName, Encoding.Unicode, true);
currentDirectory[filename] = dirent;
lastLfnName = null;
lastLfnChecksum = 0;
continue;
}
}
if(dirent.filename[0] == DIRENT_E5) dirent.filename[0] = DIRENT_DELETED;
string name = Encoding.GetString(dirent.filename).TrimEnd();