public static void Serialize(this IDictionary <short, Field> fields, Compression compression, Stream stream)
{
foreach (var field in fields)
{
byte[] keyBytes = BitConverter.GetBytes(field.Key);
byte[] valBytes;
string toStore = field.Value.Store ? field.Value.Value : string.Empty;
if (compression == Compression.GZip)
{
valBytes = Deflator.Compress(Encoding.GetBytes(toStore));
}
else if (compression == Compression.Lz)
{
valBytes = QuickLZ.compress(Encoding.GetBytes(toStore), 1);
}
else
{
valBytes = Encoding.GetBytes(toStore);
}
byte[] valLengthBytes = BitConverter.GetBytes(valBytes.Length);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(keyBytes);
Array.Reverse(valBytes);
Array.Reverse(valLengthBytes);
}
stream.Write(keyBytes, 0, sizeof(short));
stream.Write(valLengthBytes, 0, sizeof(int));
stream.Write(valBytes, 0, valBytes.Length);
}
}
public static byte[] Serialize(this IList <Field> fields, Compression compression)
{
using (var stream = new MemoryStream())
{
foreach (var field in fields)
{
byte[] keyBytes = Encoding.GetBytes(field.Key);
byte[] keyLengthBytes = BitConverter.GetBytes((short)keyBytes.Length);
byte[] valBytes;
string toStore = field.Store ? field.Value : string.Empty;
if (compression == Compression.GZip)
{
valBytes = Deflator.Compress(Encoding.GetBytes(toStore));
}
else if (compression == Compression.QuickLz)
{
valBytes = QuickLZ.compress(Encoding.GetBytes(toStore), 1);
}
else
{
valBytes = Encoding.GetBytes(toStore);
}
byte[] valLengthBytes = BitConverter.GetBytes(valBytes.Length);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(keyLengthBytes);
Array.Reverse(keyBytes);
Array.Reverse(valBytes);
Array.Reverse(valLengthBytes);
}
stream.Write(keyLengthBytes, 0, sizeof(short));
stream.Write(keyBytes, 0, keyBytes.Length);
stream.Write(valLengthBytes, 0, sizeof(int));
stream.Write(valBytes, 0, valBytes.Length);
}
return(stream.ToArray());
}
}
public static IEnumerable <Field> DeserializeFields(Stream stream, int documentId, Compression compression)
{
while (true)
{
var keyLengthBytes = new byte[sizeof(short)];
var read = stream.Read(keyLengthBytes, 0, sizeof(short));
if (read == 0)
{
break;
}
short keyLength = BitConverter.ToInt16(keyLengthBytes, 0);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(keyLengthBytes);
}
byte[] keyBytes = new byte[keyLength];
stream.Read(keyBytes, 0, keyLength);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(keyBytes);
}
string key = Encoding.GetString(keyBytes);
var valLengthBytes = new byte[sizeof(int)];
stream.Read(valLengthBytes, 0, sizeof(int));
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(valLengthBytes);
}
int valLength = BitConverter.ToInt32(valLengthBytes, 0);
byte[] valBytes = new byte[valLength];
stream.Read(valBytes, 0, valLength);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(valBytes);
}
string value;
if (compression == Compression.GZip)
{
value = Encoding.GetString(Deflator.Deflate(valBytes));
}
else if (compression == Compression.Lz)
{
value = Encoding.GetString(QuickLZ.decompress(valBytes));
}
else
{
value = Encoding.GetString(valBytes);
}
yield return(new Field(documentId, key, value));
}
}
