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Read FAT32 root directory.

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This commit is contained in:
Natalia Portillo
2019-04-26 19:57:19 +01:00
parent 35de82ec9f
commit 79d7441db4
1 changed files with 102 additions and 75 deletions
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177
DiscImageChef.Filesystems/FAT/Super.cs
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@@ -49,6 +49,10 @@ namespace DiscImageChef.Filesystems.FAT
{
public partial class FAT
{
uint fatEntriesPerSector;
IMediaImage image;
/// <summary>
/// Mounts an Apple Lisa filesystem
/// </summary>
@@ -84,6 +88,7 @@ namespace DiscImageChef.Filesystems.FAT
uint sectorsPerRealSector = 1;
// This is needed because some OSes don't put volume label as first entry in the root directory
uint sectorsForRootDirectory = 0;
uint rootDirectoryCluster = 0;
switch(bpbKind)
{
@@ -102,6 +107,8 @@ namespace DiscImageChef.Filesystems.FAT
Fat32ParameterBlockShort shortFat32Bpb =
Marshal.ByteArrayToStructureLittleEndian<Fat32ParameterBlockShort>(bpbSector);
rootDirectoryCluster = fat32Bpb.root_cluster;
// This is to support FAT partitions on hybrid ISO/USB images
if(imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
@@ -308,92 +315,112 @@ namespace DiscImageChef.Filesystems.FAT
firstClusterSector += partition.Start;
image = imagePlugin;
if(fat32) fatEntriesPerSector = imagePlugin.Info.SectorSize / 4;
else if(fat16) fatEntriesPerSector = imagePlugin.Info.SectorSize / 2;
else fatEntriesPerSector = imagePlugin.Info.SectorSize * 2 / 3;
fatFirstSector = partition.Start + reservedSectors * sectorsPerRealSector;
rootDirectoryCache = new Dictionary<string, DirectoryEntry>();
byte[] rootDirectory = null;
if(!fat32)
if(firstClusterSector + partition.Start < partition.End &&
imagePlugin.Info.XmlMediaType != XmlMediaType.OpticalDisc)
{
rootDirectory = imagePlugin.ReadSectors(firstClusterSector, sectorsForRootDirectory);
if(bpbKind == BpbKind.DecRainbow)
{
byte[] rootDirectory = imagePlugin.ReadSectors(firstClusterSector, sectorsForRootDirectory);
MemoryStream rootMs = new MemoryStream();
foreach(byte[] tmp in from ulong rootSector in new[] {0x17, 0x19, 0x1B, 0x1D, 0x1E, 0x20}
select imagePlugin.ReadSector(rootSector)) rootMs.Write(tmp, 0, tmp.Length);
if(bpbKind == BpbKind.DecRainbow)
{
MemoryStream rootMs = new MemoryStream();
foreach(byte[] tmp in from ulong rootSector in new[] {0x17, 0x19, 0x1B, 0x1D, 0x1E, 0x20}
select imagePlugin.ReadSector(rootSector))
rootMs.Write(tmp, 0, tmp.Length);
rootDirectory = rootMs.ToArray();
}
}
else
{
if(rootDirectoryCluster == 0) return Errno.InvalidArgument;
rootDirectory = rootMs.ToArray();
}
MemoryStream rootMs = new MemoryStream();
uint[] rootDirectoryClusters = GetClusters(rootDirectoryCluster);
for(int i = 0; i < rootDirectory.Length; i += 32)
{
DirectoryEntry entry =
Marshal.ByteArrayToStructureLittleEndian<DirectoryEntry>(rootDirectory, i, 32);
foreach(uint cluster in rootDirectoryClusters)
{
byte[] buffer =
imagePlugin.ReadSectors(firstClusterSector + (cluster - 2) * sectorsPerCluster,
sectorsPerCluster);
if(entry.filename[0] == DIRENT_FINISHED) break;
// Not a correct entry
if(entry.filename[0] < DIRENT_MIN && entry.filename[0] != DIRENT_E5) continue;
// Deleted or subdirectory entry
if(entry.filename[0] == DIRENT_SUBDIR || entry.filename[0] == DIRENT_DELETED) continue;
// TODO: LFN namespace
if(entry.attributes.HasFlag(FatAttributes.LFN)) continue;
string filename;
if(entry.attributes.HasFlag(FatAttributes.VolumeLabel))
{
byte[] fullname = new byte[11];
Array.Copy(entry.filename, 0, fullname, 0, 8);
Array.Copy(entry.extension, 0, fullname, 8, 3);
string volname = Encoding.GetString(fullname).Trim();
if(!string.IsNullOrEmpty(volname))
XmlFsType.VolumeName = (entry.caseinfo & 0x18) > 0 ? volname.ToLower() : volname;
if(entry.ctime > 0 && entry.cdate > 0)
{
XmlFsType.CreationDate = DateHandlers.DosToDateTime(entry.cdate, entry.ctime);
if(entry.ctime_ms > 0)
XmlFsType.CreationDate =
XmlFsType.CreationDate.AddMilliseconds(entry.ctime_ms * 10);
XmlFsType.CreationDateSpecified = true;
}
if(entry.mtime > 0 && entry.mdate > 0)
{
XmlFsType.ModificationDate =
DateHandlers.DosToDateTime(entry.mdate, entry.mtime);
XmlFsType.ModificationDateSpecified = true;
}
continue;
}
if(entry.filename[0] == DIRENT_E5) entry.filename[0] = DIRENT_DELETED;
string name = Encoding.GetString(entry.filename).Trim();
string extension = Encoding.GetString(entry.extension).Trim();
if((entry.caseinfo & FASTFAT_LOWERCASE_EXTENSION) > 0)
extension = extension.ToLower(CultureInfo.CurrentCulture);
if((entry.caseinfo & FASTFAT_LOWERCASE_BASENAME) > 0)
name = name.ToLower(CultureInfo.CurrentCulture);
if(extension != "") filename = name + "." + extension;
else filename = name;
rootDirectoryCache.Add(filename, entry);
}
rootMs.Write(buffer, 0, buffer.Length);
}
XmlFsType.VolumeName = XmlFsType.VolumeName?.Trim();
fatFirstSector = partition.Start + reservedSectors * sectorsPerRealSector;
rootDirectory = rootMs.ToArray();
}
if(rootDirectory is null) return Errno.InvalidArgument;
for(int i = 0; i < rootDirectory.Length; i += 32)
{
DirectoryEntry entry = Marshal.ByteArrayToStructureLittleEndian<DirectoryEntry>(rootDirectory, i, 32);
if(entry.filename[0] == DIRENT_FINISHED) break;
// Not a correct entry
if(entry.filename[0] < DIRENT_MIN && entry.filename[0] != DIRENT_E5) continue;
// Deleted or subdirectory entry
if(entry.filename[0] == DIRENT_SUBDIR || entry.filename[0] == DIRENT_DELETED) continue;
// TODO: LFN namespace
if(entry.attributes.HasFlag(FatAttributes.LFN)) continue;
string filename;
if(entry.attributes.HasFlag(FatAttributes.VolumeLabel))
{
byte[] fullname = new byte[11];
Array.Copy(entry.filename, 0, fullname, 0, 8);
Array.Copy(entry.extension, 0, fullname, 8, 3);
string volname = Encoding.GetString(fullname).Trim();
if(!string.IsNullOrEmpty(volname))
XmlFsType.VolumeName = (entry.caseinfo & 0x18) > 0 ? volname.ToLower() : volname;
if(entry.ctime > 0 && entry.cdate > 0)
{
XmlFsType.CreationDate = DateHandlers.DosToDateTime(entry.cdate, entry.ctime);
if(entry.ctime_ms > 0)
XmlFsType.CreationDate = XmlFsType.CreationDate.AddMilliseconds(entry.ctime_ms * 10);
XmlFsType.CreationDateSpecified = true;
}
if(entry.mtime > 0 && entry.mdate > 0)
{
XmlFsType.ModificationDate = DateHandlers.DosToDateTime(entry.mdate, entry.mtime);
XmlFsType.ModificationDateSpecified = true;
}
continue;
}
if(entry.filename[0] == DIRENT_E5) entry.filename[0] = DIRENT_DELETED;
string name = Encoding.GetString(entry.filename).Trim();
string extension = Encoding.GetString(entry.extension).Trim();
if((entry.caseinfo & FASTFAT_LOWERCASE_EXTENSION) > 0)
extension = extension.ToLower(CultureInfo.CurrentCulture);
if((entry.caseinfo & FASTFAT_LOWERCASE_BASENAME) > 0) name = name.ToLower(CultureInfo.CurrentCulture);
if(extension != "") filename = name + "." + extension;
else filename = name;
rootDirectoryCache.Add(filename, entry);
}
XmlFsType.VolumeName = XmlFsType.VolumeName?.Trim();
mounted = true;
mounted = true;
return Errno.NoError;
}