static public void LoadHeader(Stream stream, out TKey[] keys, out int[] valueLengths, out byte[] valueBuf)
{
// signature 'TBP1' (4 bytes)
var sigBuf = new byte[4];
stream.Read(sigBuf, 0, 4);
if (sigBuf[0] != 0x54 || sigBuf[1] != 0x42 || sigBuf[2] != 0x50 || sigBuf[3] != 0x31)
{
throw new FormatException("Signature mismatch");
}
// count (4 bytes)
var countBuf = new byte[4];
stream.Read(countBuf, 0, 4);
var count = BitConverter.ToInt32(countBuf, 0);
// read keys & values
var keysSizeBuf = new byte[4];
stream.Read(keysSizeBuf, 0, 4);
var keysSize = BitConverter.ToInt32(keysSizeBuf, 0);
var keysBuf = new byte[keysSize];
stream.Read(keysBuf, 0, keysBuf.Length);
keys = new TKey[count];
valueLengths = new int[count];
var valueBufSize = 0;
var keysStream = new MemoryStream(keysBuf);
var keysStreamReader = new BinaryReader(keysStream);
for (var i = 0; i < count; i++)
{
var key = StreamGenericHelper.Read <TKey>(keysStreamReader);
var valueLength = keysStreamReader.ReadInt32();
keys[i] = key;
valueLengths[i] = valueLength;
valueBufSize += valueLength;
}
valueBuf = new byte[valueBufSize];
stream.Read(valueBuf, 0, valueBufSize);
}
static public void Save(IEnumerable <KeyValuePair <TKey, JToken> > itemList, Stream stream)
{
var items = itemList.OrderBy(i => i.Key).ToList();
// signature 'TBP1' (4 bytes)
stream.Write(new byte[] { 0x54, 0x42, 0x50, 0x31 }, 0, 4);
// count (4 bytes)
var countBuf = BitConverter.GetBytes(items.Count);
stream.Write(countBuf, 0, countBuf.Length);
// keys & values
var keysStream = new MemoryStream();
var keysStreamWriter = new BinaryWriter(keysStream);
var valuesStream = new MemoryStream();
foreach (var i in items)
{
// serialize value by BsonWriter
var ms = new MemoryStream(1024);
using (var writer = new BsonWriter(ms))
{
i.Value.WriteTo(writer);
}
var valueBuf = ms.ToArray();
// serialize key and the length of value stream
StreamGenericHelper.Write(keysStreamWriter, i.Key);
keysStreamWriter.Write(valueBuf.Length);
// copy value buffer to valuesStream
valuesStream.Write(valueBuf, 0, valueBuf.Length);
}
var keysBuf = keysStream.ToArray();
stream.Write(BitConverter.GetBytes(keysBuf.Length), 0, 4);
stream.Write(keysBuf, 0, keysBuf.Length);
var valuesBuf = valuesStream.ToArray();
stream.Write(valuesBuf, 0, valuesBuf.Length);
}
public void SaveTo(TemplateTable <TKey, TValue> table, Stream stream)
{
var items = table.ToList();
items.Sort((x, y) => x.Key.CompareTo(y.Key));
// signature 'TPP1' (4 bytes)
stream.Write(new byte[] { 0x54, 0x50, 0x50, 0x31 }, 0, 4);
// count (4 bytes)
var countBuf = BitConverter.GetBytes(items.Count);
stream.Write(countBuf, 0, countBuf.Length);
// keys & values
var keysStream = new MemoryStream();
var keysStreamWriter = new BinaryWriter(keysStream);
var valuesStream = new MemoryStream();
foreach (var i in items)
{
// serialize value by BsonWriter
var curPos = valuesStream.Position;
_typeModel.Serialize(valuesStream, i.Value);
var valueLength = (int)(valuesStream.Position - curPos);
// serialize key and the length of value stream
StreamGenericHelper.Write(keysStreamWriter, i.Key);
keysStreamWriter.Write(valueLength);
}
var keysBuf = keysStream.ToArray();
stream.Write(BitConverter.GetBytes(keysBuf.Length), 0, 4);
stream.Write(keysBuf, 0, keysBuf.Length);
var valuesBuf = valuesStream.ToArray();
stream.Write(valuesBuf, 0, valuesBuf.Length);
}
