private void AddEntry(ZipFile workFile, ZipUpdate update) { Stream source = null; if (update.Entry.IsFile) { source = update.GetSource(); if (source == null) { source = updateDataSource_.GetSource(update.Entry, null); } } if (source != null) { using (source) { var sourceStreamLength = source.Length; if (update.OutEntry.Size < 0) { update.OutEntry.Size = sourceStreamLength; } else { // Check for errant entries. if (update.OutEntry.Size != sourceStreamLength) { throw new ZipException("Entry size/stream size mismatch"); } } workFile.WriteLocalEntryHeader(update); var dataStart = workFile.baseStream_.Position; using (var output = workFile.GetOutputStream(update.OutEntry)) { CopyBytes(update, output, source, sourceStreamLength, true); } var dataEnd = workFile.baseStream_.Position; update.OutEntry.CompressedSize = dataEnd - dataStart; if ((update.OutEntry.Flags & (int) GeneralBitFlags.Descriptor) == (int) GeneralBitFlags.Descriptor) { var helper = new ZipHelperStream(workFile.baseStream_); helper.WriteDataDescriptor(update.OutEntry); } } } else { workFile.WriteLocalEntryHeader(update); update.OutEntry.CompressedSize = 0; } }