private Stream OpenFile(int index)
{
FATEntry fatEntry = FAT[index];
uint len = fatEntry.End - fatEntry.Start;
return(new SubStream(DataStream, fatEntry.Start, len));
}
public Pointer GetStructPtr(FATEntry.Type type, ushort index, bool global = false)
{
FATEntry entry = GetEntry(type, index, global: global);
if (entry != null)
{
return(new Pointer(entry.off_data, files_array[SMem.Data]));
}
else
{
return(null);
}
}
public FAT(EndianBinaryReader er)
{
long baseoffset = er.BaseStream.Position;
Signature = er.ReadString(Encoding.ASCII, 4);
if (Signature != "FAT ")
{
throw new SignatureNotCorrectException(Signature, "FAT ", er.BaseStream.Position - 4);
}
SectionSize = er.ReadUInt32();
NrEntries = er.ReadUInt32();
Entries = new FATEntry[NrEntries];
for (int i = 0; i < NrEntries; i++)
{
Entries[i] = new FATEntry(er);
}
er.BaseStream.Position = baseoffset + SectionSize;
}
public FATEntry GetEntry(ushort type, ushort index, bool global = false)
{
type = (ushort)(type & 0x7FFF);
index = (ushort)(index & 0x7FFF);
FATEntry levelEntry = fatTables[CurrentLevel + 2].entries.FirstOrDefault(e => e.type == type && e.index == index);
if (levelEntry != null)
{
return(levelEntry);
}
FATEntry fix2Entry = fatTables[1].entries.FirstOrDefault(e => e.type == type && e.index == index);
if (fix2Entry != null)
{
return(fix2Entry);
}
FATEntry fixEntry = fatTables[0].entries.FirstOrDefault(e => e.type == type && e.index == index);
if (fixEntry != null)
{
return(fixEntry);
}
if (global)
{
for (int i = 2; i < fatTables.Length; i++)
{
if (i == CurrentLevel + 2)
{
continue;
}
FATEntry entry = fatTables[i].entries.FirstOrDefault(e => e.type == type && e.index == index);
if (entry != null)
{
return(entry);
}
}
}
return(null);
}
public FATEntry GetEntry(FATEntry.Type type, ushort index, bool global = false)
{
bool isFix = (index & (ushort)FATEntry.Flag.Fix) == (ushort)FATEntry.Flag.Fix;
ushort ind = (ushort)(index & 0x7FFF);
if (!global)
{
if (!isFix)
{
FATEntry levelEntry = fatTables[CurrentLevel + 2].GetEntry(type, ind);
if (levelEntry != null)
{
return(levelEntry);
}
FATEntry fix2Entry = fatTables[1].GetEntry(type, ind);
if (fix2Entry != null)
{
return(fix2Entry);
}
}
else
{
FATEntry fixEntry = fatTables[0].GetEntry(type, ind);
if (fixEntry != null)
{
return(fixEntry);
}
}
}
else
{
FATEntry levelEntry = fatTables[CurrentLevel + 2].GetEntry(type, ind);
if (levelEntry != null)
{
return(levelEntry);
}
FATEntry fix2Entry = fatTables[1].GetEntry(type, ind);
if (fix2Entry != null)
{
return(fix2Entry);
}
FATEntry fixEntry = fatTables[0].GetEntry(type, ind);
if (fixEntry != null)
{
return(fixEntry);
}
for (int i = 2; i < fatTables.Length; i++)
{
if (i == CurrentLevel + 2)
{
continue;
}
FATEntry entry = fatTables[i].GetEntry(type, ind);
if (entry != null)
{
return(entry);
}
}
}
return(null);
}
private void AccolateCluster()
{
FATEntry target = BPB.FileTable.NextFreeFATEntry();
}
