public IEnumerable<DataRecord> ReadAll(long startOffset, int maxRecordCount)
{
if (startOffset < 0)
throw new ArgumentOutOfRangeException("startOffset");
if (maxRecordCount < 0)
throw new ArgumentOutOfRangeException("maxRecordCount");
var endOffset = GetEndOffset();
if (startOffset >= endOffset)
yield break;
if (!File.Exists(Path.Combine(_path, "stream.dat")))
throw new InvalidOperationException("File stream.chk found but stream.dat file does not exist");
using (_dataStream = new FileStream(Path.Combine(_path, "stream.dat"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
using (_dataBits = new BitReader(_dataStream))
{
_dataStream.Seek(startOffset, SeekOrigin.Begin);
int count = 0;
while (_dataStream.Position < endOffset && count <= maxRecordCount)
{
var key = _dataBits.ReadString();
var length = _dataBits.Reader7BitInt();
if (_dataStream.Position + length > _dataStream.Length)
throw new InvalidOperationException("Data length is out of range.");
var data = _dataBits.ReadBytes(length);
yield return new DataRecord(key, data, _dataStream.Position);
if (count == maxRecordCount)
break;
count++;
}
}
}
}
