protected override void ReadContent(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 PageAddress(this.PageID, index);
node.Slot = reader.ReadByte();
node.PrevNode = reader.ReadPageAddress();
node.NextNode = reader.ReadPageAddress();
node.KeyLength = reader.ReadUInt16();
node.Key = reader.ReadBsonValue(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 string ReadCString(ByteReader reader)
{
var pos = 0;
while (true)
{
byte buf = reader.ReadByte();
if (buf == 0x00) break;
_strBuffer[pos++] = buf;
}
return Encoding.UTF8.GetString(_strBuffer, 0, pos);
}
/// <summary>
/// Read a BsonDocument from reader
/// </summary>
public BsonDocument ReadDocument(ByteReader reader)
{
var length = reader.ReadInt32();
var end = reader.Position + length - 5;
var obj = new BsonDocument();
while (reader.Position < end)
{
string name;
var value = this.ReadElement(reader, out name);
obj.RawValue[name] = value;
}
reader.ReadByte(); // zero
return obj;
}
/// <summary>
/// Read an BsonArray from reader
/// </summary>
public BsonArray ReadArray(ByteReader reader)
{
var length = reader.ReadInt32();
var end = reader.Position + length - 5;
var arr = new BsonArray();
while (reader.Position < end)
{
string name;
var value = this.ReadElement(reader, out name);
arr.Add(value);
}
reader.ReadByte(); // zero
return arr;
}
protected override void ReadContent(ByteReader reader)
{
var info = reader.ReadString(HEADER_INFO.Length);
var ver = reader.ReadByte();
if (info != HEADER_INFO) throw LiteException.InvalidDatabase();
if (ver != FILE_VERSION) throw LiteException.InvalidDatabaseVersion(ver);
this.ChangeID = reader.ReadUInt16();
this.FreeEmptyPageID = reader.ReadUInt32();
this.LastPageID = reader.ReadUInt32();
this.DbParams.Read(reader);
// 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>
/// Reads an element (key-value) from an reader
/// </summary>
private BsonValue ReadElement(ByteReader reader, out string name)
{
var type = reader.ReadByte();
name = this.ReadCString(reader);
if (type == 0x01) // Double
{
return reader.ReadDouble();
}
else if (type == 0x02) // String
{
return this.ReadString(reader);
}
else if (type == 0x03) // Document
{
return this.ReadDocument(reader);
}
else if (type == 0x04) // Array
{
return this.ReadArray(reader);
}
else if (type == 0x05) // Binary
{
var length = reader.ReadInt32();
var subType = reader.ReadByte();
var bytes = reader.ReadBytes(length);
switch (subType)
{
case 0x00: return bytes;
case 0x04: return new Guid(bytes);
}
}
else if (type == 0x07) // ObjectId
{
return new ObjectId(reader.ReadBytes(12));
}
else if (type == 0x08) // Boolean
{
return reader.ReadBoolean();
}
else if (type == 0x09) // DateTime
{
var ts = reader.ReadInt64();
// catch specific values for MaxValue / MinValue #19
if (ts == 253402300800000) return DateTime.MaxValue;
if (ts == -62135596800000) return DateTime.MinValue;
return BsonValue.UnixEpoch.AddMilliseconds(ts).ToLocalTime();
}
else if (type == 0x0A) // Null
{
return BsonValue.Null;
}
else if (type == 0x10) // Int32
{
return reader.ReadInt32();
}
else if (type == 0x12) // Int64
{
return reader.ReadInt64();
}
else if (type == 0xFF) // MinKey
{
return BsonValue.MinValue;
}
else if (type == 0x7F) // MaxKey
{
return BsonValue.MaxValue;
}
throw new NotSupportedException("BSON type not supported");
}
private string ReadString(ByteReader reader)
{
var length = reader.ReadInt32();
var bytes = reader.ReadBytes(length - 1);
reader.ReadByte(); // discard \x00
return Encoding.UTF8.GetString(bytes);
}
/// <summary>
/// Reads an element (key-value) from an reader
/// </summary>
private BsonValue ReadElement(ByteReader reader, out string name)
{
var type = reader.ReadByte();
name = this.ReadCString(reader);
if (type == 0x01) // Double
{
return(reader.ReadDouble());
}
else if (type == 0x02) // String
{
return(this.ReadString(reader));
}
else if (type == 0x03) // Document
{
return(this.ReadDocument(reader));
}
else if (type == 0x04) // Array
{
return(this.ReadArray(reader));
}
else if (type == 0x05) // Binary
{
var length = reader.ReadInt32();
var subType = reader.ReadByte();
var bytes = reader.ReadBytes(length);
switch (subType)
{
case 0x00: return(bytes);
case 0x04: return(new Guid(bytes));
}
}
else if (type == 0x07) // ObjectId
{
return(new ObjectId(reader.ReadBytes(12)));
}
else if (type == 0x08) // Boolean
{
return(reader.ReadBoolean());
}
else if (type == 0x09) // DateTime
{
var ts = reader.ReadInt64();
// catch specific values for MaxValue / MinValue #19
if (ts == 253402300800000)
{
return(DateTime.MaxValue);
}
if (ts == -62135596800000)
{
return(DateTime.MinValue);
}
return(BsonValue.UnixEpoch.AddMilliseconds(ts).ToLocalTime());
}
else if (type == 0x0A) // Null
{
return(BsonValue.Null);
}
else if (type == 0x10) // Int32
{
return(reader.ReadInt32());
}
else if (type == 0x12) // Int64
{
return(reader.ReadInt64());
}
else if (type == 0xFF) // MinKey
{
return(BsonValue.MinValue);
}
else if (type == 0x7F) // MaxKey
{
return(BsonValue.MaxValue);
}
throw new NotSupportedException("BSON type not supported");
}