/// <summary> /// Starts a new Zip entry. It automatically closes the previous /// entry if present. /// All entry elements bar name are optional, but must be correct if present. /// If the compression method is stored and the output is not patchable /// the compression for that entry is automatically changed to deflate level 0 /// </summary> /// <param name="entry"> /// the entry. /// </param> /// <exception cref="System.ArgumentNullException"> /// if entry passed is null. /// </exception> /// <exception cref="System.IO.IOException"> /// if an I/O error occured. /// </exception> /// <exception cref="System.InvalidOperationException"> /// if stream was finished /// </exception> /// <exception cref="ZipException"> /// Too many entries in the Zip file<br/> /// Entry name is too long<br/> /// Finish has already been called<br/> /// </exception> public void PutNextEntry(ZipEntry entry) { if (entry == null) { throw new ArgumentNullException(nameof(entry)); } if (entries == null) { throw new InvalidOperationException("ZipOutputStream was finished"); } if (curEntry != null) { CloseEntry(); } if (entries.Count == int.MaxValue) { throw new ZipException("Too many entries for Zip file"); } CompressionMethod method = entry.CompressionMethod; int compressionLevel = defaultCompressionLevel; // Clear flags that the library manages internally entry.Flags &= (int)GeneralBitFlags.UnicodeText; patchEntryHeader = false; bool headerInfoAvailable; // No need to compress - definitely no data. if (entry.Size == 0) { entry.CompressedSize = entry.Size; entry.Crc = 0; method = CompressionMethod.Stored; headerInfoAvailable = true; } else { headerInfoAvailable = (entry.Size >= 0) && entry.HasCrc && entry.CompressedSize >= 0; // Switch to deflation if storing isnt possible. if (method == CompressionMethod.Stored) { if (!headerInfoAvailable) { if (!CanPatchEntries) { // Can't patch entries so storing is not possible. method = CompressionMethod.Deflated; compressionLevel = 0; } } else // entry.size must be > 0 { entry.CompressedSize = entry.Size; headerInfoAvailable = entry.HasCrc; } } } if (headerInfoAvailable == false) { if (CanPatchEntries == false) { // Only way to record size and compressed size is to append a data descriptor // after compressed data. // Stored entries of this form have already been converted to deflating. entry.Flags |= 8; } else { patchEntryHeader = true; } } if (Password != null) { entry.IsCrypted = true; if (entry.Crc < 0) { // Need to append a data descriptor as the crc isnt available for use // with encryption, the date is used instead. Setting the flag // indicates this to the decompressor. entry.Flags |= 8; } } entry.Offset = offset; entry.CompressionMethod = (CompressionMethod)method; curMethod = method; sizePatchPos = -1; if ((useZip64_ == UseZip64.On) || ((entry.Size < 0) && (useZip64_ == UseZip64.Dynamic))) { entry.ForceZip64(); } // Write the local file header WriteLeInt(ZipConstants.LocalHeaderSignature); WriteLeShort(entry.Version); WriteLeShort(entry.Flags); WriteLeShort((byte)entry.CompressionMethodForHeader); WriteLeInt((int)entry.DosTime); // TODO: Refactor header writing. Its done in several places. if (headerInfoAvailable) { WriteLeInt((int)entry.Crc); if (entry.LocalHeaderRequiresZip64) { WriteLeInt(-1); WriteLeInt(-1); } else { WriteLeInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CryptoHeaderSize : (int)entry.CompressedSize); WriteLeInt((int)entry.Size); } } else { if (patchEntryHeader) { crcPatchPos = baseOutputStream_.Position; } WriteLeInt(0); // Crc if (patchEntryHeader) { sizePatchPos = baseOutputStream_.Position; } // For local header both sizes appear in Zip64 Extended Information if (entry.LocalHeaderRequiresZip64 || patchEntryHeader) { WriteLeInt(-1); WriteLeInt(-1); } else { WriteLeInt(0); // Compressed size WriteLeInt(0); // Uncompressed size } } byte[] name = ZipStrings.ConvertToArray(entry.Flags, entry.Name); if (name.Length > 0xFFFF) { throw new ZipException("Entry name too long."); } var ed = new ZipExtraData(entry.ExtraData); if (entry.LocalHeaderRequiresZip64) { ed.StartNewEntry(); if (headerInfoAvailable) { ed.AddLeLong(entry.Size); ed.AddLeLong(entry.CompressedSize); } else { ed.AddLeLong(-1); ed.AddLeLong(-1); } ed.AddNewEntry(1); if (!ed.Find(1)) { throw new ZipException("Internal error cant find extra data"); } if (patchEntryHeader) { sizePatchPos = ed.CurrentReadIndex; } } else { ed.Delete(1); } if (entry.AESKeySize > 0) { AddExtraDataAES(entry, ed); } byte[] extra = ed.GetEntryData(); WriteLeShort(name.Length); WriteLeShort(extra.Length); if (name.Length > 0) { baseOutputStream_.Write(name, 0, name.Length); } if (entry.LocalHeaderRequiresZip64 && patchEntryHeader) { sizePatchPos += baseOutputStream_.Position; } if (extra.Length > 0) { baseOutputStream_.Write(extra, 0, extra.Length); } offset += ZipConstants.LocalHeaderBaseSize + name.Length + extra.Length; // Fix offsetOfCentraldir for AES if (entry.AESKeySize > 0) { offset += entry.AESOverheadSize; } // Activate the entry. curEntry = entry; crc.Reset(); if (method == CompressionMethod.Deflated) { deflater_.Reset(); deflater_.SetLevel(compressionLevel); } size = 0; if (entry.IsCrypted) { if (entry.AESKeySize > 0) { WriteAESHeader(entry); } else { if (entry.Crc < 0) { // so testing Zip will says its ok WriteEncryptionHeader(entry.DosTime << 16); } else { WriteEncryptionHeader(entry.Crc); } } } }