/// <summary>
/// Truncates the archiveFile represented by the ZipArchiveFile to be empty and returns a Stream that can be used
/// to write (binary) data into it.
/// </summary>
/// <returns>A Stream that can be written on. </returns>
public Stream Create()
{
if (IsReadOnly)
{
throw new ApplicationException("Archive is ReadOnly");
}
if (uncompressedData != null && (uncompressedData.CanWrite || uncompressedData.CanRead))
{
throw new ApplicationException("ZipArchiveFile already open.");
}
compressedData = null;
positionOfCompressedDataInArchive = 0;
compressedLength = 0;
uncompressedData = new RepairedMemoryStream(256);
return(uncompressedData);
}
internal void WriteToStream(Stream writer)
{
System.Diagnostics.Debug.Assert(!IsReadOnly);
System.Diagnostics.Debug.Assert(positionOfCompressedDataInArchive == 0);
if (uncompressedData != null)
{
if (uncompressedData.CanWrite)
{
throw new Exception("Unclosed writable handle to " + Name + " still exists at Save time");
}
MemoryStream compressedDataStream = new RepairedMemoryStream((int)(uncompressedData.Length * 5 / 8));
Stream compressor = new System.IO.Compression.DeflateStream(compressedDataStream, System.IO.Compression.CompressionMode.Compress);
compressor.Write(uncompressedData.GetBuffer(), 0, (int)uncompressedData.Length);
compressor.Close();
compressionMethod = CompressionMethod.Deflate;
compressedLength = (int)compressedDataStream.Length;
compressedData = compressedDataStream.GetBuffer();
}
System.Diagnostics.Debug.Assert(compressedData != null);
WriteZipFileHeader(writer);
writer.Write(compressedData, 0, compressedLength);
}
