public static void ReadFromFile(IndexUnit indexPage, BinaryReader reader)
{
long initPos = reader.Seek(100L + (indexPage.UnitID * 0x1000L));
if (reader.ReadByte() != 2)
{
throw new FileDBException("PageID {0} is not a Index Page", new object[] { indexPage.UnitID });
}
indexPage.NextUnitID = reader.ReadUInt32();
indexPage.NodeIndex = reader.ReadByte();
reader.Seek(initPos + 0x2eL);
for (int i = 0; i <= indexPage.NodeIndex; i++)
{
IndexNode node = indexPage.Nodes[i];
node.ID = reader.ReadGuid();
node.IsDeleted = reader.ReadBoolean();
node.Right.Index = reader.ReadByte();
node.Right.PageID = reader.ReadUInt32();
node.Left.Index = reader.ReadByte();
node.Left.PageID = reader.ReadUInt32();
node.DataPageID = reader.ReadUInt32();
node.FileName = reader.ReadString(0x29);
node.FileExtension = reader.ReadString(5);
node.FileLength = reader.ReadUInt32();
}
}
public void AddPage(IndexUnit indexPage, bool markAsDirty)
{
if (!this._cache.ContainsKey(indexPage.UnitID))
{
if (this._cache.Count >= 200)
{
KeyValuePair<uint, IndexUnit> pageToRemove = default(KeyValuePair<uint, IndexUnit>);
foreach (KeyValuePair<uint, IndexUnit> x in _cache)
{
if (x.Key != this._rootPageID)
{
pageToRemove = x;
break;
}
}
if (pageToRemove.Value.IsDirty)
{
UnitFactory.WriteToFile(pageToRemove.Value, this._writer);
pageToRemove.Value.IsDirty = false;
}
this._cache.Remove(pageToRemove.Key);
}
this._cache.Add(indexPage.UnitID, indexPage);
}
if (markAsDirty)
{
indexPage.IsDirty = true;
}
}
public IndexUnit GetFreeIndexPage()
{
IndexUnit freeIndexPage = this.CacheIndexPage.GetPage(this.Header.FreeIndexPageID);
if (freeIndexPage.NodeIndex >= 0x31)
{
Joy.Data.Header header = this.Header;
header.LastPageID++;
this.Header.IsDirty = true;
IndexUnit newIndexPage = new IndexUnit(this.Header.LastPageID);
freeIndexPage.NextUnitID = newIndexPage.UnitID;
this.Header.FreeIndexPageID = this.Header.LastPageID;
this.CacheIndexPage.AddPage(freeIndexPage, true);
return newIndexPage;
}
freeIndexPage.NodeIndex = (byte) (freeIndexPage.NodeIndex + 1);
return freeIndexPage;
}
public static void CreateEmptyFile(BinaryWriter writer)
{
Header header = new Header {
IndexRootPageID = 0,
FreeIndexPageID = 0,
FreeDataPageID = uint.MaxValue,
LastFreeDataPageID = uint.MaxValue,
LastPageID = 0
};
HeaderFactory.WriteToFile(header, writer);
IndexUnit pageIndex = new IndexUnit(0) {
NodeIndex = 0,
NextUnitID = uint.MaxValue
};
IndexNode indexNode = pageIndex.Nodes[0];
indexNode.ID = new Guid(new byte[] { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f });
indexNode.IsDeleted = true;
indexNode.Right = new IndexLink();
indexNode.Left = new IndexLink();
indexNode.DataPageID = uint.MaxValue;
indexNode.FileName = string.Empty;
indexNode.FileExtension = string.Empty;
UnitFactory.WriteToFile(pageIndex, writer);
}
public static void WriteToFile(IndexUnit indexPage, BinaryWriter writer)
{
long initPos = writer.Seek(100L + (indexPage.UnitID * 0x1000L));
writer.Write((byte) indexPage.Type);
writer.Write(indexPage.NextUnitID);
writer.Write(indexPage.NodeIndex);
writer.Seek(initPos + 0x2eL);
for (int i = 0; i <= indexPage.NodeIndex; i++)
{
IndexNode node = indexPage.Nodes[i];
writer.Write(node.ID);
writer.Write(node.IsDeleted);
writer.Write(node.Right.Index);
writer.Write(node.Right.PageID);
writer.Write(node.Left.Index);
writer.Write(node.Left.PageID);
writer.Write(node.DataPageID);
writer.Write(node.FileName.ToBytes(0x29));
writer.Write(node.FileExtension.ToBytes(5));
writer.Write(node.FileLength);
}
}
public static IndexUnit GetIndexPage(uint pageID, BinaryReader reader)
{
IndexUnit indexPage = new IndexUnit(pageID);
ReadFromFile(indexPage, reader);
return indexPage;
}
public void AddPage(IndexUnit indexPage)
{
this.AddPage(indexPage, false);
}