/// <summary>
/// Writes data to the stream at the current location.
/// </summary>
/// <param name="buffer">The data to write</param>
/// <param name="offset">The first byte to write from buffer</param>
/// <param name="count">The number of bytes to write</param>
public override void Write(byte[] buffer, int offset, int count)
{
CheckDisposed();
_stats.TotalWritesIn++;
int blockSize = _settings.BlockSize;
long firstBlock = _position / blockSize;
long endBlock = Utilities.Ceil(Math.Min(_position + count, Length), blockSize);
int numBlocks = (int)(endBlock - firstBlock);
try
{
_wrappedStream.Position = _position;
_wrappedStream.Write(buffer, offset, count);
}
catch
{
InvalidateBlocks(firstBlock, numBlocks);
throw;
}
int offsetInNextBlock = (int)(_position % blockSize);
if (offsetInNextBlock != 0)
{
_stats.UnalignedWritesIn++;
}
// For each block touched, if it's cached, update it
int bytesProcessed = 0;
for (int i = 0; i < numBlocks; ++i)
{
int bufferPos = offset + bytesProcessed;
int bytesThisBlock = Math.Min(count - bytesProcessed, blockSize - offsetInNextBlock);
Block block;
if (_cache.TryGetBlock(firstBlock + i, out block))
{
Array.Copy(buffer, bufferPos, block.Data, offsetInNextBlock, bytesThisBlock);
block.Available = Math.Max(block.Available, offsetInNextBlock + bytesThisBlock);
}
offsetInNextBlock = 0;
bytesProcessed += bytesThisBlock;
}
_position += count;
}
/// <summary>
/// Writes data to the stream (not currently supported).
/// </summary>
/// <param name="buffer">The data to write</param>
/// <param name="offset">The first byte to write</param>
/// <param name="count">The number of bytes to write</param>
public override void Write(byte[] buffer, int offset, int count)
{
lock (_common)
{
SparseStream wrapped = Wrapped;
if (_position + count > wrapped.Length)
{
throw new IOException("Attempt to extend stream");
}
wrapped.Position = _position;
wrapped.Write(buffer, offset, count);
_position += count;
}
}
/// <summary>
/// Writes a byte array into the buffer.
/// </summary>
/// <param name="pos">The start offset within the buffer.</param>
/// <param name="buffer">The source byte array.</param>
/// <param name="offset">The start offset within the source byte array.</param>
/// <param name="count">The number of bytes to write.</param>
public override void Write(long pos, byte[] buffer, int offset, int count)
{
_stream.Position = pos;
_stream.Write(buffer, offset, count);
}