protected override void ReadContent(ByteReader reader)
{
CollectionName = reader.ReadString();
DocumentCount = reader.ReadInt64();
FreeDataPageID = reader.ReadUInt32();
foreach (var index in Indexes)
{
var field = reader.ReadString();
var eq = field.IndexOf('=');
// Use same string to avoid change file defition
if (eq > 0)
{
index.Field = field.Substring(0, eq);
index.Expression = field.Substring(eq + 1);
}
else
{
index.Field = field;
index.Expression = "$." + field;
}
index.Unique = reader.ReadBoolean();
index.HeadNode = reader.ReadPageAddress();
index.TailNode = reader.ReadPageAddress();
index.FreeIndexPageID = reader.ReadUInt32();
}
// position on page-footer (avoid file structure change)
reader.Position = PAGE_SIZE - 8 - CollectionIndex.INDEX_PER_COLLECTION;
foreach (var index in Indexes)
{
var maxLevel = reader.ReadByte();
index.MaxLevel = maxLevel == 0 ? (byte)IndexNode.MAX_LEVEL_LENGTH : maxLevel;
}
Sequence = reader.ReadInt64();
}
/// <summary>
/// Reads an element (key-value) from an reader
/// </summary>
private BsonValue ReadElement(ByteReader reader, out string name)
{
var type = reader.ReadByte();
name = ReadCString(reader);
if (type == 0x01) // Double
{
return(reader.ReadDouble());
}
else if (type == 0x02) // String
{
return(ReadString(reader));
}
else if (type == 0x03) // Document
{
return(ReadDocument(reader));
}
else if (type == 0x04) // Array
{
return(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);
}
var date = BsonValue.UnixEpoch.AddMilliseconds(ts);
return(_utcDate ? date : date.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 == 0x13) // Decimal
{
return(reader.ReadDecimal());
}
else if (type == 0xFF) // MinKey
{
return(BsonValue.MinValue);
}
else if (type == 0x7F) // MaxKey
{
return(BsonValue.MaxValue);
}
throw new NotSupportedException("BSON type not supported");
}