/**
* Constructor for a new Document
*
* @param name the name of the POIFSDocument
* @param stream the InputStream we read data from
*/
public NPOIFSDocument(String name, NPOIFSFileSystem filesystem, Stream stream)
{
this._filesystem = filesystem;
// Buffer the contents into memory. This is a bit icky...
// TODO Replace with a buffer up to the mini stream size, then streaming write
byte[] contents;
if (stream is MemoryStream)
{
MemoryStream bais = (MemoryStream)stream;
contents = new byte[bais.Length];
bais.Read(contents, 0, contents.Length);
}
else
{
MemoryStream baos = new MemoryStream();
IOUtils.Copy(stream, baos);
contents = baos.ToArray();
}
// Do we need to store as a mini stream or a full one?
if (contents.Length <= POIFSConstants.BIG_BLOCK_MINIMUM_DOCUMENT_SIZE)
{
_stream = new NPOIFSStream(filesystem.GetMiniStore());
_block_size = _filesystem.GetMiniStore().GetBlockStoreBlockSize();
}
else
{
_stream = new NPOIFSStream(filesystem);
_block_size = _filesystem.GetBlockStoreBlockSize();
}
// Store it
_stream.UpdateContents(contents);
// And build the property for it
this._property = new DocumentProperty(name, contents.Length);
_property.StartBlock = _stream.GetStartBlock();
}
/**
* Load the block, extending the underlying stream if needed
*/
public override ByteBuffer CreateBlockIfNeeded(int offset)
{
// Try to Get it without extending the stream
try
{
return(GetBlockAt(offset));
}
catch (IndexOutOfRangeException)
{
// Need to extend the stream
// TODO Replace this with proper append support
// For now, do the extending by hand...
// Ask for another block
int newBigBlock = _filesystem.GetFreeBlock();
_filesystem.CreateBlockIfNeeded(newBigBlock);
// Tack it onto the end of our chain
ChainLoopDetector loopDetector = _filesystem.GetChainLoopDetector();
int block = _mini_stream.GetStartBlock();
while (true)
{
loopDetector.Claim(block);
int next = _filesystem.GetNextBlock(block);
if (next == POIFSConstants.END_OF_CHAIN)
{
break;
}
block = next;
}
_filesystem.SetNextBlock(block, newBigBlock);
_filesystem.SetNextBlock(newBigBlock, POIFSConstants.END_OF_CHAIN);
// Now try again to Get it
return(CreateBlockIfNeeded(offset));
}
}
