/// <summary>
/// read data from the internal stores
/// </summary>
/// <param name="buffer">the buffer to write to</param>
/// <param name="offset">the offset into our storage to read from</param>
public virtual void Read(byte[] buffer, int offset)
{
//if (this._property.ShouldUseSmallBlocks)
//{
// SmallDocumentBlock.Read(this._small_store.Blocks, buffer, offset);
//}
//else
//{
// DocumentBlock.Read(this._big_store.Blocks, buffer, offset);
//}
int len = buffer.Length;
DataInputBlock currentBlock = GetDataInputBlock(offset);
int blockAvailable = currentBlock.Available();
if (blockAvailable > len)
{
currentBlock.ReadFully(buffer, 0, len);
return;
}
// else read big amount in chunks
int remaining = len;
int writePos = 0;
int currentOffset = offset;
while (remaining > 0)
{
bool blockIsExpiring = remaining >= blockAvailable;
int reqSize;
if (blockIsExpiring)
{
reqSize = blockAvailable;
}
else
{
reqSize = remaining;
}
currentBlock.ReadFully(buffer, writePos, reqSize);
remaining -= reqSize;
writePos += reqSize;
currentOffset += reqSize;
if (blockIsExpiring)
{
if (currentOffset == _size)
{
if (remaining > 0)
{
throw new InvalidOperationException("reached end of document stream unexpectedly");
}
currentBlock = null;
break;
}
currentBlock = GetDataInputBlock(currentOffset);
blockAvailable = currentBlock.Available();
}
}
}
public override void ReadFully(byte[] buf, int off, int len)
{
CheckAvaliable(len);
int blockAvailable = _currentBlock.Available();
if (blockAvailable > len)
{
_currentBlock.ReadFully(buf, off, len);
_current_offset += len;
return;
}
// else read big amount in chunks
int remaining = len;
int WritePos = off;
while (remaining > 0)
{
bool blockIsExpiring = remaining >= blockAvailable;
int reqSize;
if (blockIsExpiring)
{
reqSize = blockAvailable;
}
else
{
reqSize = remaining;
}
_currentBlock.ReadFully(buf, WritePos, reqSize);
remaining -= reqSize;
WritePos += reqSize;
_current_offset += reqSize;
if (blockIsExpiring)
{
if (_current_offset == _document_size)
{
if (remaining > 0)
{
throw new InvalidOperationException(
"reached end of document stream unexpectedly");
}
_currentBlock = null;
break;
}
_currentBlock = GetDataInputBlock(_current_offset);
blockAvailable = _currentBlock.Available();
}
}
}
