/// <summary> /// Complete cleanup as the final part of closing. /// </summary> /// <param name="testCrc">True if the crc value should be tested</param> void CompleteCloseEntry(bool testCrc) { StopDecrypting(); if ((flags & 8) != 0) { ReadDataDescriptor(); } size = 0; if ( testCrc && ((crc.Value & 0xFFFFFFFFL) != entry.Crc) && (entry.Crc != -1)) { throw new ZipException("CRC mismatch"); } crc.Reset(); if (method == (int)CompressionMethod.Deflated) { inf.Reset(); } entry = null; }
/// <summary> /// Closes the zip input stream /// </summary> public override void Close() { internalReader = new ReadDataHandler(ReadingNotAvailable); crc = null; entry = null; base.Close(); }
/// <summary> /// Advances to the next entry in the archive /// </summary> /// <returns> /// The next <see cref="ZipEntry">entry</see> in the archive or null if there are no more entries. /// </returns> /// <remarks> /// If the previous entry is still open <see cref="CloseEntry">CloseEntry</see> is called. /// </remarks> /// <exception cref="InvalidOperationException"> /// Input stream is closed /// </exception> /// <exception cref="ZipException"> /// Password is not set, password is invalid, compression method is invalid, /// version required to extract is not supported /// </exception> public ZipEntry GetNextEntry() { if (crc == null) { throw new InvalidOperationException("Closed."); } if (entry != null) { CloseEntry(); } int header = inputBuffer.ReadLeInt(); if (header == ZipConstants.CentralHeaderSignature || header == ZipConstants.EndOfCentralDirectorySignature || header == ZipConstants.CentralHeaderDigitalSignature || header == ZipConstants.ArchiveExtraDataSignature || header == ZipConstants.Zip64CentralFileHeaderSignature) { // No more individual entries exist Close(); return null; } // -jr- 07-Dec-2003 Ignore spanning temporary signatures if found // Spanning signature is same as descriptor signature and is untested as yet. if ( (header == ZipConstants.SpanningTempSignature) || (header == ZipConstants.SpanningSignature) ) { header = inputBuffer.ReadLeInt(); } if (header != ZipConstants.LocalHeaderSignature) { throw new ZipException("Wrong Local header signature: 0x" + String.Format("{0:X}", header)); } short versionRequiredToExtract = (short)inputBuffer.ReadLeShort(); flags = inputBuffer.ReadLeShort(); method = inputBuffer.ReadLeShort(); uint dostime = (uint)inputBuffer.ReadLeInt(); int crc2 = inputBuffer.ReadLeInt(); csize = inputBuffer.ReadLeInt(); size = inputBuffer.ReadLeInt(); int nameLen = inputBuffer.ReadLeShort(); int extraLen = inputBuffer.ReadLeShort(); bool isCrypted = (flags & 1) == 1; byte[] buffer = new byte[nameLen]; inputBuffer.ReadRawBuffer(buffer); string name = ZipConstants.ConvertToStringExt(flags, buffer); entry = new ZipEntry(name, versionRequiredToExtract); entry.Flags = flags; entry.CompressionMethod = (CompressionMethod)method; if ((flags & 8) == 0) { entry.Crc = crc2 & 0xFFFFFFFFL; entry.Size = size & 0xFFFFFFFFL; entry.CompressedSize = csize & 0xFFFFFFFFL; entry.CryptoCheckValue = (byte)((crc2 >> 24) & 0xff); } else { // This allows for GNU, WinZip and possibly other archives, the PKZIP spec // says these values are zero under these circumstances. if (crc2 != 0) { entry.Crc = crc2 & 0xFFFFFFFFL; } if (size != 0) { entry.Size = size & 0xFFFFFFFFL; } if (csize != 0) { entry.CompressedSize = csize & 0xFFFFFFFFL; } entry.CryptoCheckValue = (byte)((dostime >> 8) & 0xff); } entry.DosTime = dostime; // If local header requires Zip64 is true then the extended header should contain // both values. // Handle extra data if present. This can set/alter some fields of the entry. if (extraLen > 0) { byte[] extra = new byte[extraLen]; inputBuffer.ReadRawBuffer(extra); entry.ExtraData = extra; } entry.ProcessExtraData(true); if ( entry.CompressedSize >= 0 ) { csize = entry.CompressedSize; } if ( entry.Size >= 0 ) { size = entry.Size; } if (method == (int)CompressionMethod.Stored && (!isCrypted && csize != size || (isCrypted && csize - ZipConstants.CryptoHeaderSize != size))) { throw new ZipException("Stored, but compressed != uncompressed"); } // Determine how to handle reading of data if this is attempted. if (entry.IsCompressionMethodSupported()) { internalReader = new ReadDataHandler(InitialRead); } else { internalReader = new ReadDataHandler(ReadingNotSupported); } return entry; }
public ZipEntry(ZipEntry entry) { if ( entry == null ) { throw new ArgumentNullException("entry"); } known = entry.known; name = entry.name; size = entry.size; compressedSize = entry.compressedSize; crc = entry.crc; dosTime = entry.dosTime; method = entry.method; comment = entry.comment; versionToExtract = entry.versionToExtract; versionMadeBy = entry.versionMadeBy; externalFileAttributes = entry.externalFileAttributes; flags = entry.flags; zipFileIndex = entry.zipFileIndex; offset = entry.offset; forceZip64_ = entry.forceZip64_; if ( entry.extra != null ) { extra = new byte[entry.extra.Length]; Array.Copy(entry.extra, 0, extra, 0, entry.extra.Length); } }