public void SaveFilesystem()
{
MemoryStream memoryStream = new MemoryStream();
BinaryWriter binWriter = new BinaryWriter((Stream)memoryStream, Encoding.ASCII);
List <NitroROM.FileEntry> list1 = ((IEnumerable <NitroROM.FileEntry>) this.m_FileEntries).ToList <NitroROM.FileEntry>();
list1.RemoveAll((Predicate <NitroROM.FileEntry>)(x => x.Name == ""));
list1.Sort((Comparison <NitroROM.FileEntry>)((x, y) =>
{
if ((int)x.ParentID > (int)y.ParentID)
{
return(1);
}
return((int)x.ParentID >= (int)y.ParentID ? string.Compare(x.Name, y.Name) : -1);
}));
this.m_BinReader.BaseStream.Position = 0L;
binWriter.Write(this.m_BinReader.ReadBytes(16384));
this.m_BinReader.BaseStream.Position = 44L;
int count = this.m_BinReader.ReadInt32();
this.m_BinReader.BaseStream.Position = 16384L;
binWriter.Write(this.m_BinReader.ReadBytes(count));
int position1 = (int)binWriter.BaseStream.Position;
binWriter.BaseStream.Position = 48L;
binWriter.Write(position1);
this.m_BinReader.BaseStream.Position = 48L;
int num1 = this.m_BinReader.ReadInt32();
binWriter.BaseStream.Position = (long)position1;
this.m_BinReader.BaseStream.Position = (long)num1;
binWriter.Write(this.m_BinReader.ReadBytes(150308));
int[] numArray1 = new int[this.m_OverlayEntries.Length + list1.Count];
int[] numArray2 = new int[this.m_OverlayEntries.Length + list1.Count];
numArray1[0] = (int)binWriter.BaseStream.Position;
int length = list1.Max <NitroROM.FileEntry>((Func <NitroROM.FileEntry, int>)(x => x.InternalID != ushort.MaxValue ? (int)x.InternalID : 0)) + 1;
NitroOverlay nitroOverlay = new NitroOverlay(this, 0U);
int position2 = (int)binWriter.BaseStream.Position;
binWriter.Write(nitroOverlay.ReadBlock(0U, 156U));
binWriter.Write(length);
binWriter.Write(nitroOverlay.Read32(160U));
binWriter.Write(uint.MaxValue);
binWriter.Write(nitroOverlay.ReadBlock(168U, 24U));
int[] numArray3 = new int[length];
for (int index = 0; index < list1.Count; ++index)
{
if (list1[index].InternalID != ushort.MaxValue)
{
numArray3[(int)list1[index].InternalID] = (int)binWriter.BaseStream.Position - position2 + 34251808;
binWriter.Write((list1[index].FullName + "\0").ToCharArray());
Helper.AlignWriter(binWriter, 4U);
}
}
Helper.WritePosAndRestore(binWriter, (uint)(position2 + 164), (uint)(34251808 - position2));
foreach (int num2 in numArray3)
{
binWriter.Write(num2);
}
numArray2[0] = (int)binWriter.BaseStream.Position;
for (int index = 1; index < this.m_OverlayEntries.Length; ++index)
{
numArray1[index] = (int)binWriter.BaseStream.Position;
NitroROM.FileEntry fileEntry = this.m_FileEntries[(int)this.m_OverlayEntries[index].FileID];
if (fileEntry.Data != null)
{
binWriter.Write(fileEntry.Data);
}
else
{
this.m_BinReader.BaseStream.Position = (long)fileEntry.Offset;
binWriter.Write(this.m_BinReader.ReadBytes((int)fileEntry.Size));
}
numArray2[index] = (int)binWriter.BaseStream.Position;
Helper.AlignWriter(binWriter, 4U);
}
Helper.WritePosAndRestore(binWriter, 80U, 0U);
for (int index = 0; index < this.m_OverlayEntries.Length; ++index)
{
binWriter.Write(index);
binWriter.Write(this.m_OverlayEntries[index].RAMAddress);
binWriter.Write(this.m_OverlayEntries[index].RAMSize);
binWriter.Write(this.m_OverlayEntries[index].BSSSize);
binWriter.Write(this.m_OverlayEntries[index].StaticInitStart);
binWriter.Write(this.m_OverlayEntries[index].StaticInitEnd);
binWriter.Write(index);
binWriter.Write((uint)((long)this.m_OverlayEntries[index].Flags & (long)~(index == 0 ? 16777216 : 0)));
}
for (int index = 0; index < list1.Count; ++index)
{
numArray1[index + this.m_OverlayEntries.Length] = (int)binWriter.BaseStream.Position;
if (list1[index].Data != null)
{
binWriter.Write(list1[index].Data);
NitroROM.FileEntry fileEntry = list1[index];
fileEntry.Data = (byte[])null;
list1[index] = fileEntry;
}
else
{
this.m_BinReader.BaseStream.Position = (long)list1[index].Offset;
binWriter.Write(this.m_BinReader.ReadBytes((int)list1[index].Size));
}
numArray2[index + this.m_OverlayEntries.Length] = (int)binWriter.BaseStream.Position;
Helper.AlignWriter(binWriter, 4U);
}
int position3 = (int)binWriter.BaseStream.Position;
binWriter.Write(new byte[8 * this.m_DirEntries.Length]);
int[] numArray4 = new int[this.m_DirEntries.Length];
List <NitroROM.DirEntry> list2 = ((IEnumerable <NitroROM.DirEntry>) this.m_DirEntries).ToList <NitroROM.DirEntry>();
list2.RemoveAt(0);
list2.Sort((Comparison <NitroROM.DirEntry>)((x, y) =>
{
if ((int)x.ParentID > (int)y.ParentID)
{
return(1);
}
return((int)x.ParentID >= (int)y.ParentID ? string.Compare(x.Name, y.Name) : -1);
}));
int index1 = 0;
int index2 = 0;
for (int index3 = 0; index3 < this.m_DirEntries.Length; ++index3)
{
numArray4[index3] = (int)binWriter.BaseStream.Position - position3;
for (; index1 < list1.Count && (int)list1[index1].ParentID == index3 + 61440; ++index1)
{
binWriter.Write((byte)list1[index1].Name.Length);
binWriter.Write(list1[index1].Name.ToCharArray());
}
for (; index2 < list2.Count && (int)list2[index2].ParentID == index3 + 61440; ++index2)
{
binWriter.Write((byte)(list2[index2].Name.Length + 128));
binWriter.Write(list2[index2].Name.ToCharArray());
binWriter.Write(list2[index2].ID);
}
binWriter.Write((byte)0);
}
Helper.AlignWriter(binWriter, 4U);
int position4 = (int)binWriter.BaseStream.Position;
binWriter.BaseStream.Position = (long)position3;
int index4 = 0;
for (int index3 = 0; index3 < this.m_DirEntries.Length; ++index3)
{
binWriter.Write(numArray4[index3]);
binWriter.Write((ushort)(index4 + this.m_OverlayEntries.Length));
if (index3 == 0)
{
binWriter.Write((ushort)this.m_DirEntries.Length);
}
else
{
binWriter.Write(this.m_DirEntries[index3].ParentID);
}
while (index4 < list1.Count && (int)list1[index4].ParentID == index3 + 61440)
{
++index4;
}
}
binWriter.BaseStream.Position = (long)position4;
for (int index3 = 0; index3 < numArray1.Length; ++index3)
{
binWriter.Write(numArray1[index3]);
binWriter.Write(numArray2[index3]);
}
int position5 = (int)binWriter.BaseStream.Position;
binWriter.BaseStream.Position = 64L;
binWriter.Write(position3);
binWriter.Write(position4 - position3);
binWriter.Write(position4);
binWriter.Write(position5 - position4);
binWriter.BaseStream.Position = 20L;
byte num3 = 0;
int num4 = position5;
while (num4 > 131072)
{
num4 >>= 1;
++num3;
}
binWriter.Write(num3);
binWriter.BaseStream.Position = 128L;
binWriter.Write(position5);
this.m_FileStream.Close();
this.m_FileStream = (Stream)memoryStream;
this.m_BinReader = new BinaryReader(this.m_FileStream, Encoding.ASCII);
this.m_BinWriter = binWriter;
this.FixCRC16();
this.AllowEmptySpaceInOv0();
this.m_BinWriter.BaseStream.SetLength((long)position5);
this.EndRW(true);
}