public static NativePathEntry FromReader(BinaryReader reader)
{
NativePathEntry npe = new NativePathEntry();
npe.ChildLengths = new Dictionary <string, int>();
byte nameLength = reader.ReadByte();
byte extraSectors = reader.ReadByte();
Debug.Assert(extraSectors == 0);
npe.FirstSector = reader.ReadInt32();
npe.ParentEntry = reader.ReadInt16() - 1; // Fixup because we are 0 based
if (reader.PeekChar() == 0)
{
//reader.BaseStream.Seek( nameLength, SeekOrigin.Current );
npe.IsRoot = true;
reader.ReadByte();
}
else
{
npe.Name = ReadString(reader, nameLength);
}
if (nameLength % 2 == 1)
{
reader.BaseStream.Seek(1, SeekOrigin.Current);
}
return(npe);
}
public static NativePrimaryDescriptor?FromStream(BinaryReader reader)
{
NativePrimaryDescriptor npd = new NativePrimaryDescriptor();
// Starts at logical block 16 (0x8000)
reader.BaseStream.Seek(16 * 2048, SeekOrigin.Begin);
reader.BaseStream.Seek(1, SeekOrigin.Current);
string magic = ReadString(reader, 5);
if (magic != "CD001")
{
return(null);
}
reader.BaseStream.Seek(2, SeekOrigin.Current);
npd.SystemID = ReadString(reader, 32);
npd.VolumeID = ReadString(reader, 32);
reader.BaseStream.Seek(8, SeekOrigin.Current);
npd.SectorCount = reader.ReadInt32();
reader.BaseStream.Seek(4 + 32 + 4 + 4, SeekOrigin.Current);
npd.SectorSize = reader.ReadInt16();
reader.BaseStream.Seek(2, SeekOrigin.Current);
npd.PathTableLength = reader.ReadInt32();
reader.BaseStream.Seek(4, SeekOrigin.Current);
npd.PathTableStart = reader.ReadInt32();
npd.AltPathTableStart = reader.ReadInt32();
reader.BaseStream.Seek(8, SeekOrigin.Current);
long x = reader.BaseStream.Position;
NativePathEntry npe = NativePathEntry.FromReader(reader);
Debug.Assert(npe != null);
npd.Root = npe;
long z = reader.BaseStream.Position - x;
reader.BaseStream.Seek(34 - z, SeekOrigin.Current);
npd.VolumeName = ReadString(reader, 128);
npd.Publisher = ReadString(reader, 128);
reader.BaseStream.Seek(128, SeekOrigin.Current);
npd.Application = ReadString(reader, 128);
reader.BaseStream.Seek(37 + 37 + 37, SeekOrigin.Current);
string creationString = ReadString(reader, 17);
npd.Created = ParseDate(creationString);
// Seek to the end
reader.BaseStream.Seek(17 * 2048, SeekOrigin.Begin);
return(npd);
}
protected MediaFolder ParseIsoFileSystem(string path, bool minimalCache)
{
Debug.Assert(path != null);
Debug.Assert(File.Exists(path) == true);
if (File.Exists(path) == false)
{
return(null);
}
using (FileStream stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read))
using (BinaryReader reader = new BinaryReader(stream))
{
NativePrimaryDescriptor?npdv = NativePrimaryDescriptor.FromStream(reader);
Debug.Assert(npdv != null);
if (npdv == null)
{
return(null);
}
NativePrimaryDescriptor npd = npdv.Value;
List <NativePathEntry> npes = new List <NativePathEntry>();
stream.Seek(npd.PathTableStart * 2048, SeekOrigin.Begin);
while (stream.Position < (npd.PathTableStart * 2048) + npd.PathTableLength)
{
NativePathEntry npe = NativePathEntry.FromReader(reader);
if (npe == null)
{
continue;
}
npes.Add(npe);
}
List <MediaFolder> folders = new List <MediaFolder>(npes.Count);
for (int n = 0; n < npes.Count; n++)
{
NativePathEntry npe = npes[n];
MediaFolder current = null;
MediaFolder parent = null;
if (npe.IsRoot == false)
{
parent = folders[npe.ParentEntry];
}
if (npe.Length == 0)
{
// Look in parent for length
if (parent != null)
{
NativePathEntry pe = npes[npe.ParentEntry];
npe.Length = pe.ChildLengths[npe.Name];
}
else
{
npe.Length = 2048;
}
}
int m = 0;
for (int s = 0; s < npe.Length / 2048; s++)
{
stream.Seek((npe.FirstSector + s) * 2048, SeekOrigin.Begin);
while (true)
{
NativeEntry?nev = NativeEntry.FromReader(reader);
if (nev == null)
{
break;
}
NativeEntry ne = nev.Value;
if (m == 0)
{
// '.' this dir
MediaItemAttributes attributes = MediaItemAttributes.Normal;
if ((ne.Flags & NativeEntryFlags.Hidden) == NativeEntryFlags.Hidden)
{
attributes |= MediaItemAttributes.Hidden;
}
current = new MediaFolder(this, parent, npe.Name, attributes, ne.Timestamp);
folders.Add(current);
}
else if (m == 1)
{
// '..' parent dir - ignored
}
else
{
// Child
if ((ne.Flags & NativeEntryFlags.Directory) == NativeEntryFlags.Directory)
{
// Directories are handled when it is their turn to be added
// EXCEPT for size, which we need to get now and store back
// At this time in the code, we have all dirs prior to the one whose length
// we just got - since we have already added ourselves, we know we have its
// parent too
npe.ChildLengths.Add(ne.Name, ne.Length);
}
else
{
MediaItemAttributes attributes = MediaItemAttributes.Normal;
if ((ne.Flags & NativeEntryFlags.Hidden) == NativeEntryFlags.Hidden)
{
attributes |= MediaItemAttributes.Hidden;
}
long lbn = ne.FirstSector /* * 2048*/;
MediaFile file = new MediaFile(this, current, ne.Name, attributes, ne.Timestamp, lbn * 2048, ne.Length);
//Log.WriteLine(Verbosity.Normal, Feature.Bios, "{0} = {1}", ne.Name, lbn);
// Pretty sure this is wrong, but it shouldn't matter
Debug.Assert(_lbnLookup.ContainsKey(lbn) == false);
_lbnLookup[lbn] = file;
}
}
m++;
if ((ne.Flags & NativeEntryFlags.LastEntry) == NativeEntryFlags.LastEntry)
{
break;
}
}
}
}
return(folders[0]);
}
}
public static NativePathEntry FromReader( BinaryReader reader )
{
NativePathEntry npe = new NativePathEntry();
npe.ChildLengths = new Dictionary<string, int>();
byte nameLength = reader.ReadByte();
byte extraSectors = reader.ReadByte();
Debug.Assert( extraSectors == 0 );
npe.FirstSector = reader.ReadInt32();
npe.ParentEntry = reader.ReadInt16() - 1; // Fixup because we are 0 based
if( reader.PeekChar() == 0 )
{
//reader.BaseStream.Seek( nameLength, SeekOrigin.Current );
npe.IsRoot = true;
reader.ReadByte();
}
else
npe.Name = ReadString( reader, nameLength );
if( nameLength % 2 == 1 )
reader.BaseStream.Seek( 1, SeekOrigin.Current );
return npe;
}
