protected override void ReadContent(LiteDB.ByteReader reader)
{
this.Nodes = new Dictionary <ushort, IndexNode>(this.ItemCount);
for (var i = 0; i < this.ItemCount; i++)
{
var index = reader.ReadUInt16();
var levels = reader.ReadByte();
var node = new IndexNode(levels);
node.Page = this;
node.Position = new LiteDB.PageAddress(this.PageID, index);
node.KeyLength = reader.ReadUInt16();
node.Key = ReadBsonValue(reader, node.KeyLength);
node.DataBlock = reader.ReadPageAddress();
for (var j = 0; j < node.Prev.Length; j++)
{
node.Prev[j] = reader.ReadPageAddress();
node.Next[j] = reader.ReadPageAddress();
}
this.Nodes.Add(node.Position.Index, node);
}
}
private void ReadHeader(LiteDB.ByteReader reader)
{
// first 5 bytes (pageID + pageType) was readed before class create
// this.PageID
// this.PageType
this.PrevPageID = reader.ReadUInt32();
this.NextPageID = reader.ReadUInt32();
this.ItemCount = reader.ReadUInt16();
reader.ReadUInt16(); // FreeBytes;
reader.Skip(8); // reserved 8 bytes
}
/// <summary>
/// Read a page with correct instance page object. Checks for pageType
/// </summary>
public static BasePage ReadPage(byte[] buffer)
{
var reader = new LiteDB.ByteReader(buffer);
var pageID = reader.ReadUInt32();
var pageType = (PageType)reader.ReadByte();
var page = CreateInstance(pageID, pageType);
page.ReadHeader(reader);
page.ReadContent(reader);
return(page);
}
protected override void ReadContent(LiteDB.ByteReader reader)
{
reader.ReadString(HEADER_INFO.Length);
reader.ReadByte();
this.ChangeID = reader.ReadUInt16();
this.FreeEmptyPageID = reader.ReadUInt32();
this.LastPageID = reader.ReadUInt32();
this.DbVersion = reader.ReadUInt16();
this.Password = reader.ReadBytes(this.Password.Length);
// read page collections references (position on end of page)
var cols = reader.ReadByte();
for (var i = 0; i < cols; i++)
{
this.CollectionPages.Add(reader.ReadString(), reader.ReadUInt32());
}
}
/// <summary>
/// Write a custom ReadBsonValue because BsonType changed from v6 to v7
/// </summary>
private LiteDB.BsonValue ReadBsonValue(LiteDB.ByteReader reader, ushort length)
{
var type = reader.ReadByte();
// using numbers because BsonType changed
switch (type)
{
case 1: return(LiteDB.BsonValue.Null);
case 2: return(reader.ReadInt32());
case 3: return(reader.ReadInt64());
case 4: return(reader.ReadDouble());
case 5: return(reader.ReadString(length));
case 6: return(new LiteDB.BsonReader(false).ReadDocument(reader));
case 7: return(new LiteDB.BsonReader(false).ReadArray(reader));
case 8: return(reader.ReadBytes(length));
case 9: return(reader.ReadObjectId());
case 10: return(reader.ReadGuid());
case 11: return(reader.ReadBoolean());
case 12: return(reader.ReadDateTime());
case 13: return(reader.ReadDateTimeOffset(length));
case 0: return(LiteDB.BsonValue.MinValue);
case 14: return(LiteDB.BsonValue.MaxValue);
}
throw new NotImplementedException();
}
protected override void ReadContent(LiteDB.ByteReader reader)
{
this.DataBlocks = new Dictionary <ushort, DataBlock>(ItemCount);
for (var i = 0; i < ItemCount; i++)
{
var block = new DataBlock();
block.Page = this;
block.Position = new LiteDB.PageAddress(this.PageID, reader.ReadUInt16());
block.ExtendPageID = reader.ReadUInt32();
for (var j = 0; j < CollectionIndex.INDEX_PER_COLLECTION; j++)
{
block.IndexRef[j] = reader.ReadPageAddress();
}
var size = reader.ReadUInt16();
block.Data = reader.ReadBytes(size);
this.DataBlocks.Add(block.Position.Index, block);
}
}
protected override void ReadContent(LiteDB.ByteReader reader)
{
this.CollectionName = reader.ReadString();
this.FreeDataPageID = reader.ReadUInt32();
var uintCount = reader.ReadUInt32(); // read as uint (4 bytes)
foreach (var index in this.Indexes)
{
index.Field = reader.ReadString();
index.HeadNode = reader.ReadPageAddress();
index.TailNode = reader.ReadPageAddress();
index.FreeIndexPageID = reader.ReadUInt32();
index.Unique = reader.ReadBoolean();
reader.ReadBoolean(); // IgnoreCase
reader.ReadBoolean(); // TrimWhitespace
reader.ReadBoolean(); // EmptyStringToNull
reader.ReadBoolean(); // RemoveAccents
}
// be compatible with v2_beta
var longCount = reader.ReadInt64();
this.DocumentCount = Math.Max(uintCount, longCount);
}
protected abstract void ReadContent(LiteDB.ByteReader reader);
protected override void ReadContent(LiteDB.ByteReader reader)
{
this.Data = reader.ReadBytes(this.ItemCount);
}
