internal static ZipIOLocalFileBlock CreateNew(ZipIOBlockManager blockManager,
string fileName,
CompressionMethodEnum compressionMethod,
DeflateOptionEnum deflateOption)
{
//this should be ensured by the higher levels
Debug.Assert(Enum.IsDefined(typeof(CompressionMethodEnum), compressionMethod));
Debug.Assert(Enum.IsDefined(typeof(DeflateOptionEnum), deflateOption));
ZipIOLocalFileBlock block = new ZipIOLocalFileBlock(blockManager, false, false);
block._localFileHeader = ZipIOLocalFileHeader.CreateNew
(fileName,
blockManager.Encoding,
compressionMethod,
deflateOption, blockManager.Streaming);
// if in streaming mode - force to Zip64 mode in case the streams get large
if (blockManager.Streaming)
{
block._localFileDataDescriptor = ZipIOLocalFileDataDescriptor.CreateNew();
}
block._offset = 0; // intial value, that is not too important for the brand new File item
block._dirtyFlag = true;
block._fileItemStream = new ZipIOFileItemStream(blockManager,
block,
block._offset + block._localFileHeader.Size,
0);
// create deflate wrapper if necessary
if (compressionMethod == CompressionMethodEnum.Deflated)
{
Debug.Assert(block._fileItemStream.Position == 0, "CompressStream assumes base stream is at position zero");
// Pass bool to indicate that this stream is "new" and must be dirty so that
// the valid empty deflate stream is emitted (2-byte sequence - see CompressStream for details).
block._deflateStream = new CompressStream(block._fileItemStream, 0, true);
block._crcCalculatingStream = new ProgressiveCrcCalculatingStream(blockManager, block._deflateStream);
}
else
{
block._crcCalculatingStream = new ProgressiveCrcCalculatingStream(blockManager, block._fileItemStream);
}
return(block);
}
