void CopyEntry(ZipFile workFile, ZipUpdate update) { workFile.WriteLocalEntryHeader(update); if (update.Entry.CompressedSize > 0) { const int NameLengthOffset = 26; long entryDataOffset = update.Entry.Offset + NameLengthOffset; // TODO: This wont work for SFX files! baseStream_.Seek(entryDataOffset, SeekOrigin.Begin); uint nameLength = ReadLEUshort(); uint extraLength = ReadLEUshort(); baseStream_.Seek(nameLength + extraLength, SeekOrigin.Current); CopyBytes(update, workFile.baseStream_, baseStream_, update.Entry.CompressedSize, false); } CopyDescriptorBytes(update, workFile.baseStream_, baseStream_); }
void ModifyEntry(ZipFile workFile, ZipUpdate update) { workFile.WriteLocalEntryHeader(update); long dataStart = workFile.baseStream_.Position; // TODO: This is slow if the changes don't effect the data!! if (update.Entry.IsFile && (update.Filename != null)) { using (Stream output = workFile.GetOutputStream(update.OutEntry)) { using (Stream source = this.GetInputStream(update.Entry)) { CopyBytes(update, output, source, source.Length, true); } } } long dataEnd = workFile.baseStream_.Position; update.Entry.CompressedSize = dataEnd - dataStart; }
void CopyEntryDirect(ZipFile workFile, ZipUpdate update, ref long destinationPosition) { bool skipOver = false; if (update.Entry.Offset == destinationPosition) { skipOver = true; } if (!skipOver) { baseStream_.Position = destinationPosition; workFile.WriteLocalEntryHeader(update); destinationPosition = baseStream_.Position; } long sourcePosition = 0; const int NameLengthOffset = 26; // TODO: Add base for SFX friendly handling long entryDataOffset = update.Entry.Offset + NameLengthOffset; baseStream_.Seek(entryDataOffset, SeekOrigin.Begin); // Clumsy way of handling retrieving the original name and extra data length for now. // TODO: Stop re-reading name and data length in CopyEntryDirect. uint nameLength = ReadLEUshort(); uint extraLength = ReadLEUshort(); sourcePosition = baseStream_.Position + nameLength + extraLength; if (skipOver) { if (update.OffsetBasedSize != -1) destinationPosition += update.OffsetBasedSize; else // TODO: Find out why this calculation comes up 4 bytes short on some entries in ODT (Office Document Text) archives. // WinZip produces a warning on these entries: // "caution: value of lrec.csize (compressed size) changed from ..." destinationPosition += (sourcePosition - entryDataOffset) + NameLengthOffset + // Header size update.Entry.CompressedSize + GetDescriptorSize(update); } else { if (update.Entry.CompressedSize > 0) { CopyEntryDataDirect(update, baseStream_, false, ref destinationPosition, ref sourcePosition); } CopyDescriptorBytesDirect(update, baseStream_, ref destinationPosition, sourcePosition); } }
void AddEntry(ZipFile workFile, ZipUpdate update) { Stream source = null; if (update.Entry.IsFile) { source = update.GetSource(); if (source == null) { source = updateDataSource_.GetSource(update.Entry, update.Filename); } } if (source != null) { using (source) { long 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); long dataStart = workFile.baseStream_.Position; using (Stream output = workFile.GetOutputStream(update.OutEntry)) { CopyBytes(update, output, source, sourceStreamLength, true); } long dataEnd = workFile.baseStream_.Position; update.OutEntry.CompressedSize = dataEnd - dataStart; if ((update.OutEntry.Flags & (int)GeneralBitFlags.Descriptor) == (int)GeneralBitFlags.Descriptor) { ZipHelperStream helper = new ZipHelperStream(workFile.baseStream_); helper.WriteDataDescriptor(update.OutEntry); } } } else { workFile.WriteLocalEntryHeader(update); update.OutEntry.CompressedSize = 0; } }