/// <summary>
/// Writes all key value pairs in current prefix to stream (prefix itself is not written)
/// </summary>
/// <param name="transaction">transaction from where export all data</param>
/// <param name="stream">where to write it to</param>
public static void Export(IKeyValueDBTransaction transaction, Stream stream)
{
if (transaction == null)
{
throw new ArgumentNullException("transaction");
}
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanWrite)
{
throw new ArgumentException("stream must be writeable", "stream");
}
var keyValueCount = transaction.GetKeyValueCount();
var tempbuf = new byte[16];
tempbuf[0] = (byte)'B';
tempbuf[1] = (byte)'T';
tempbuf[2] = (byte)'D';
tempbuf[3] = (byte)'B';
tempbuf[4] = (byte)'E';
tempbuf[5] = (byte)'X';
tempbuf[6] = (byte)'P';
tempbuf[7] = (byte)'1';
PackUnpack.PackInt64LE(tempbuf, 8, keyValueCount);
stream.Write(tempbuf, 0, 16);
transaction.FindFirstKey();
for (long kv = 0; kv < keyValueCount; kv++)
{
var keySize = transaction.GetKeySize();
PackUnpack.PackInt32LE(tempbuf, 0, keySize);
stream.Write(tempbuf, 0, 4);
long ofs = 0;
while (ofs < keySize)
{
int len;
byte[] buf;
int bufOfs;
transaction.PeekKey((int)ofs, out len, out buf, out bufOfs);
stream.Write(buf, bufOfs, len);
ofs += len;
}
var valueSize = transaction.GetValueSize();
PackUnpack.PackInt64LE(tempbuf, 0, valueSize);
stream.Write(tempbuf, 0, 8);
ofs = 0;
while (ofs < valueSize)
{
int len;
byte[] buf;
int bufOfs;
transaction.PeekValue(ofs, out len, out buf, out bufOfs);
stream.Write(buf, bufOfs, len);
ofs += len;
}
transaction.FindNextKey();
}
}
public void Restart()
{
_keySize = _transaction.GetKeySize();
if (_keySize < 0)
{
_keySize = 0;
}
_ofs = 0;
FillBuffer();
}
public static byte[] ReadKey(this IKeyValueDBTransaction transaction)
{
int keySize = transaction.GetKeySize();
if (keySize < 0)
{
return(null);
}
var result = new byte[keySize];
transaction.ReadKey(0, keySize, result, 0);
return(result);
}
/// <summary>
/// Writes all key value pairs in current prefix to stream (prefix itself is not written)
/// </summary>
/// <param name="transaction">transaction from where export all data</param>
/// <param name="stream">where to write it to</param>
public static void Export(IKeyValueDBTransaction transaction, Stream stream)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (stream == null) throw new ArgumentNullException("stream");
if (!stream.CanWrite) throw new ArgumentException("stream must be writeable", "stream");
var keyValueCount = transaction.GetKeyValueCount();
var tempbuf = new byte[16];
tempbuf[0] = (byte)'B';
tempbuf[1] = (byte)'T';
tempbuf[2] = (byte)'D';
tempbuf[3] = (byte)'B';
tempbuf[4] = (byte)'E';
tempbuf[5] = (byte)'X';
tempbuf[6] = (byte)'P';
tempbuf[7] = (byte)'1';
PackUnpack.PackInt64LE(tempbuf, 8, keyValueCount);
stream.Write(tempbuf, 0, 16);
transaction.FindFirstKey();
for (long kv = 0; kv < keyValueCount; kv++)
{
var keySize = transaction.GetKeySize();
PackUnpack.PackInt32LE(tempbuf, 0, keySize);
stream.Write(tempbuf, 0, 4);
long ofs = 0;
while (ofs < keySize)
{
int len;
byte[] buf;
int bufOfs;
transaction.PeekKey((int)ofs, out len, out buf, out bufOfs);
stream.Write(buf, bufOfs, len);
ofs += len;
}
var valueSize = transaction.GetValueSize();
PackUnpack.PackInt64LE(tempbuf, 0, valueSize);
stream.Write(tempbuf, 0, 8);
ofs = 0;
while (ofs < valueSize)
{
int len;
byte[] buf;
int bufOfs;
transaction.PeekValue(ofs, out len, out buf, out bufOfs);
stream.Write(buf, bufOfs, len);
ofs += len;
}
transaction.FindNextKey();
}
}
public int GetKeySize()
{
LogSimpleOperation(KVReplayOperation.GetKeySize);
return(_tr.GetKeySize());
}