public void Dispose()
{
if (!this.IsDirty)
{
this.stream?.Dispose();
return;
}
var strings = this.entries.Select(entry => new[] { entry.Folder, entry.File }).SelectMany(s => s).Distinct().ToArray();
using var stream = new MemoryStream();
using var writer = new BinaryWriter(stream);
// Header
writer.Write(Idx.MagicHeader);
writer.Write(Idx.Version);
writer.Write(this.entries.Count());
// Strings
writer.Write(Idx.MagicSector);
writer.Write(strings.Length);
writer.Write(strings.Sum(s => s.Length + 1));
foreach (var s in strings)
{
writer.Write(Encoding.ASCII.GetBytes(s));
writer.Write((byte)0x00);
}
// StringInfos
writer.Write(Idx.MagicSector);
foreach (var s in strings)
{
writer.Write((short)s.Length);
writer.Write(Idx.Hash(s));
}
// FileInfos
writer.Write(Idx.MagicSector);
foreach (var entry in this.entries)
{
entry.Write(writer, strings);
}
// Save the file.
var data = stream.GetBuffer().Take((int)stream.Position).ToArray();
Encryption.Encrypt(data);
this.stream.Position = 0;
this.stream.Write(data);
this.stream.SetLength(data.Length);
this.stream?.Dispose();
}
private void Read()
{
this.stream.Position = 0;
var data = new byte[this.stream.Length];
this.stream.Read(data);
Encryption.Decrypt(data);
using var stream = new MemoryStream(data);
using var reader = new BinaryReader(stream);
// Header
if (!reader.ReadChars(4).SequenceEqual(Idx.MagicHeader))
{
throw new Exception("IDX.Header: Wrong identifier!");
}
if (reader.ReadInt32() != Idx.Version)
{
throw new Exception("IDX.header: Wrong version!");
}
var numFiles = reader.ReadInt32();
// Strings
if (!reader.ReadChars(4).SequenceEqual(Idx.MagicSector))
{
throw new Exception("IDX.Strings: Wrong identifier!");
}
var numStrings = reader.ReadInt32();
var dataLength = reader.ReadInt32();
var position = stream.Position;
var strings = new string[numStrings];
for (var i = 0; i < numStrings; i++)
{
var characters = new List <char>();
while (true)
{
var character = reader.ReadChar();
if (character == 0x00)
{
strings[i] = new string(characters.ToArray());
break;
}
characters.Add(character);
}
}
if (stream.Position != position + dataLength)
{
throw new Exception("IDX.Strings: Wrong dataLength!");
}
// StringInfos
if (!reader.ReadChars(4).SequenceEqual(Idx.MagicSector))
{
throw new Exception("IDX.StringInfos: Wrong identifier!");
}
for (var i = 0; i < numStrings; i++)
{
if (reader.ReadInt16() != strings[i].Length)
{
throw new Exception("IDX.StringInfos: Wrong length!");
}
if (reader.ReadInt32() != Idx.Hash(strings[i]))
{
throw new Exception("IDX.StringInfos: Wrong hash!");
}
}
// FileInfos
if (!reader.ReadChars(4).SequenceEqual(Idx.MagicSector))
{
throw new Exception("IDX.FileInfos: Wrong identifier!");
}
for (var i = 0; i < numFiles; i++)
{
// TODO some containers have duplicate paths. verify the load order and store only the valid one.
this.entries.Add(new IdxEntry(reader, strings));
}
// TODO happens when a new patch is applied. Launching the game once will fix the idx file. We should support this too.
if (stream.Position < stream.Length)
{
throw new Exception("IDX: Data at the end!");
}
}