Multiple tweaks and bugfixes

ICSharpCode.SharpZipLib/Tar/TarArchive.cs

@@ -556,6 +556,9 @@ public void ExtractContents(string destinationDirectory)
 					break;
 				}
 
+				if (entry.TarHeader.TypeFlag == TarHeader.LF_LINK || entry.TarHeader.TypeFlag == TarHeader.LF_SYMLINK)
+					continue;
+
 				ExtractEntry(destinationDirectory, entry);
 			}
 		}

ICSharpCode.SharpZipLib/Tar/TarHeader.cs

@@ -147,6 +147,11 @@ public class TarHeader : ICloneable
 		/// </summary>
 		public const int DEVLEN = 8;
 
+		/// <summary>
+		/// The length of the name prefix field in a header buffer.
+		/// </summary>
+		public const int PREFIXLEN = 155;
+
 		//
 		// LF_ constants represent the "type" of an entry
 		//
@@ -597,21 +602,26 @@ public void ParseBuffer(byte[] header)
 			Magic = ParseName(header, offset, MAGICLEN).ToString();
 			offset += MAGICLEN;
 
-			Version = ParseName(header, offset, VERSIONLEN).ToString();
-			offset += VERSIONLEN;
+			if (Magic == "ustar")
+			{
+				Version = ParseName(header, offset, VERSIONLEN).ToString();
+				offset += VERSIONLEN;
 
-			UserName = ParseName(header, offset, UNAMELEN).ToString();
-			offset += UNAMELEN;
+				UserName = ParseName(header, offset, UNAMELEN).ToString();
+				offset += UNAMELEN;
 
-			GroupName = ParseName(header, offset, GNAMELEN).ToString();
-			offset += GNAMELEN;
+				GroupName = ParseName(header, offset, GNAMELEN).ToString();
+				offset += GNAMELEN;
 
-			DevMajor = (int)ParseOctal(header, offset, DEVLEN);
-			offset += DEVLEN;
+				DevMajor = (int) ParseOctal(header, offset, DEVLEN);
+				offset += DEVLEN;
 
-			DevMinor = (int)ParseOctal(header, offset, DEVLEN);
+				DevMinor = (int) ParseOctal(header, offset, DEVLEN);
+				offset += DEVLEN;
 
-			// Fields past this point not currently parsed or used...
+				string prefix = ParseName(header, offset, PREFIXLEN).ToString();
+				if (!string.IsNullOrEmpty(prefix)) Name = prefix + '/' + Name;
+			}
 
 			isChecksumValid = Checksum == TarHeader.MakeCheckSum(header);
 		}

ICSharpCode.SharpZipLib/Tar/TarInputStream.cs

@@ -491,6 +491,8 @@ public TarEntry GetNextEntry()
 						headerBuf = this.tarBuffer.ReadBlock();
 					} else if (header.TypeFlag != TarHeader.LF_NORMAL &&
 							   header.TypeFlag != TarHeader.LF_OLDNORM &&
+							   header.TypeFlag != TarHeader.LF_LINK &&
+							   header.TypeFlag != TarHeader.LF_SYMLINK &&
 							   header.TypeFlag != TarHeader.LF_DIR) {
 						// Ignore things we dont understand completely for now
 						SkipToNextEntry();

ICSharpCode.SharpZipLib/Zip/ZipEntry.cs

@@ -257,6 +257,7 @@ public ZipEntry(ZipEntry entry)
 			compressedSize = entry.compressedSize;
 			crc = entry.crc;
 			dosTime = entry.dosTime;
+			dateTime = entry.dateTime;
 			method = entry.method;
 			comment = entry.comment;
 			versionToExtract = entry.versionToExtract;
@@ -706,16 +707,7 @@ public long DosTime
 		/// </remarks>
 		public DateTime DateTime
 		{
-			get
-			{
-				uint sec = Math.Min(59, 2 * (dosTime & 0x1f));
-				uint min = Math.Min(59, (dosTime >> 5) & 0x3f);
-				uint hrs = Math.Min(23, (dosTime >> 11) & 0x1f);
-				uint mon = Math.Max(1, Math.Min(12, ((dosTime >> 21) & 0xf)));
-				uint year = ((dosTime >> 25) & 0x7f) + 1980;
-				int day = Math.Max(1, Math.Min(DateTime.DaysInMonth((int)year, (int)mon), (int)((dosTime >> 16) & 0x1f)));
-				return new System.DateTime((int)year, (int)mon, day, (int)hrs, (int)min, (int)sec);
-			}
+			get { return dateTime; }
 
 			set
 			{
@@ -1041,49 +1033,41 @@ internal void ProcessExtraData(bool localHeader)
 				}
 			}
 
-			if (extraData.Find(10)) {
-				// No room for any tags.
-				if (extraData.ValueLength < 4) {
-					throw new ZipException("NTFS Extra data invalid");
-				}
-
-				extraData.ReadInt(); // Reserved
-
-				while (extraData.UnreadCount >= 4) {
-					int ntfsTag = extraData.ReadShort();
-					int ntfsLength = extraData.ReadShort();
-					if (ntfsTag == 1) {
-						if (ntfsLength >= 24) {
-							long lastModification = extraData.ReadLong();
-							long lastAccess = extraData.ReadLong();
-							long createTime = extraData.ReadLong();
-
-							DateTime = System.DateTime.FromFileTime(lastModification);
-						}
-						break;
-					} else {
-						// An unknown NTFS tag so simply skip it.
-						extraData.Skip(ntfsLength);
-					}
-				}
-			} else if (extraData.Find(0x5455)) {
-				int length = extraData.ValueLength;
-				int flags = extraData.ReadByte();
-
-				// Can include other times but these are ignored.  Length of data should
-				// actually be 1 + 4 * no of bits in flags.
-				if (((flags & 1) != 0) && (length >= 5)) {
-					int iTime = extraData.ReadInt();
-
-					DateTime = (new System.DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
-						new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
-				}
-			}
+			dateTime = GetDateTime(extraData);
 			if (method == CompressionMethod.WinZipAES) {
 				ProcessAESExtraData(extraData);
 			}
 		}
 
+		private DateTime GetDateTime(ZipExtraData extraData) {
+			// Check for NT timestamp
+            // NOTE: Disable by default to match behavior of InfoZIP
+#if RESPECT_NT_TIMESTAMP
+			NTTaggedData ntData = extraData.GetData<NTTaggedData>();
+			if (ntData != null)
+				return ntData.LastModificationTime;
+#endif
+
+			// Check for Unix timestamp
+			ExtendedUnixData unixData = extraData.GetData<ExtendedUnixData>();
+			if (unixData != null &&
+				// Only apply modification time, but require all other values to be present
+				// This is done to match InfoZIP's behaviour
+				((unixData.Include & ExtendedUnixData.Flags.ModificationTime) != 0) &&
+				((unixData.Include & ExtendedUnixData.Flags.AccessTime) != 0) &&
+				((unixData.Include & ExtendedUnixData.Flags.CreateTime) != 0))
+				return unixData.ModificationTime;
+
+			// Fall back to DOS time
+			uint sec = Math.Min(59, 2 * (dosTime & 0x1f));
+			uint min = Math.Min(59, (dosTime >> 5) & 0x3f);
+			uint hrs = Math.Min(23, (dosTime >> 11) & 0x1f);
+			uint mon = Math.Max(1, Math.Min(12, ((dosTime >> 21) & 0xf)));
+			uint year = ((dosTime >> 25) & 0x7f) + 1980;
+			int day = Math.Max(1, Math.Min(DateTime.DaysInMonth((int)year, (int)mon), (int)((dosTime >> 16) & 0x1f)));
+			return new DateTime((int)year, (int)mon, day, (int)hrs, (int)min, (int)sec, DateTimeKind.Utc);
+		}
+
 		// For AES the method in the entry is 99, and the real compression method is in the extradata
 		//
 		private void ProcessAESExtraData(ZipExtraData extraData)
@@ -1281,6 +1265,7 @@ public static string CleanName(string name)
 		ushort versionToExtract;                // Version required to extract (library handles <= 2.0)
 		uint crc;
 		uint dosTime;
+		DateTime dateTime;
 
 		CompressionMethod method = CompressionMethod.Deflated;
 		byte[] extra;

ICSharpCode.SharpZipLib/Zip/ZipExtraData.cs

@@ -190,25 +190,29 @@ public void SetData(byte[] data, int index, int count)
 				// bit 2           if set, creation time is present
 
 				_flags = (Flags)helperStream.ReadByte();
-				if (((_flags & Flags.ModificationTime) != 0) && (count >= 5)) {
+				if (((_flags & Flags.ModificationTime) != 0))
+				{
 					int iTime = helperStream.ReadLEInt();
 
-					_modificationTime = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
-						new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
+					_modificationTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc) +
+						new TimeSpan(0, 0, 0, iTime, 0);
+
+					// Central-header version is truncated after modification time
+					if (count <= 5) return;
 				}
 
 				if ((_flags & Flags.AccessTime) != 0) {
 					int iTime = helperStream.ReadLEInt();
 
-					_lastAccessTime = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
-						new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
+					_lastAccessTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc) +
+						new TimeSpan(0, 0, 0, iTime, 0);
 				}
 
 				if ((_flags & Flags.CreateTime) != 0) {
 					int iTime = helperStream.ReadLEInt();
 
-					_createTime = (new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime() +
-						new TimeSpan(0, 0, 0, iTime, 0)).ToLocalTime();
+					_createTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc) +
+						new TimeSpan(0, 0, 0, iTime, 0);
 				}
 			}
 		}
@@ -224,17 +228,17 @@ public byte[] GetData()
 				helperStream.IsStreamOwner = false;
 				helperStream.WriteByte((byte)_flags);     // Flags
 				if ((_flags & Flags.ModificationTime) != 0) {
-					TimeSpan span = _modificationTime.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
+					TimeSpan span = _modificationTime - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
 					var seconds = (int)span.TotalSeconds;
 					helperStream.WriteLEInt(seconds);
 				}
 				if ((_flags & Flags.AccessTime) != 0) {
-					TimeSpan span = _lastAccessTime.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
+					TimeSpan span = _lastAccessTime - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
 					var seconds = (int)span.TotalSeconds;
 					helperStream.WriteLEInt(seconds);
 				}
 				if ((_flags & Flags.CreateTime) != 0) {
-					TimeSpan span = _createTime.ToUniversalTime() - new DateTime(1970, 1, 1, 0, 0, 0).ToUniversalTime();
+					TimeSpan span = _createTime - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
 					var seconds = (int)span.TotalSeconds;
 					helperStream.WriteLEInt(seconds);
 				}
@@ -321,7 +325,7 @@ public DateTime CreateTime
 		/// <summary>
 		/// Get/set the <see cref="Flags">values</see> to include.
 		/// </summary>
-		Flags Include
+		public Flags Include
 		{
 			get { return _flags; }
 			set { _flags = value; }
@@ -365,13 +369,13 @@ public void SetData(byte[] data, int index, int count)
 					if (ntfsTag == 1) {
 						if (ntfsLength >= 24) {
 							long lastModificationTicks = helperStream.ReadLELong();
-							_lastModificationTime = DateTime.FromFileTime(lastModificationTicks);
+							_lastModificationTime = DateTime.FromFileTimeUtc(lastModificationTicks);
 
 							long lastAccessTicks = helperStream.ReadLELong();
-							_lastAccessTime = DateTime.FromFileTime(lastAccessTicks);
+							_lastAccessTime = DateTime.FromFileTimeUtc(lastAccessTicks);
 
 							long createTimeTicks = helperStream.ReadLELong();
-							_createTime = DateTime.FromFileTime(createTimeTicks);
+							_createTime = DateTime.FromFileTimeUtc(createTimeTicks);
 						}
 						break;
 					} else {
@@ -394,9 +398,9 @@ public byte[] GetData()
 				helperStream.WriteLEInt(0);       // Reserved
 				helperStream.WriteLEShort(1);     // Tag
 				helperStream.WriteLEShort(24);    // Length = 3 x 8.
-				helperStream.WriteLELong(_lastModificationTime.ToFileTime());
-				helperStream.WriteLELong(_lastAccessTime.ToFileTime());
-				helperStream.WriteLELong(_createTime.ToFileTime());
+				helperStream.WriteLELong(_lastModificationTime.ToFileTimeUtc());
+				helperStream.WriteLELong(_lastAccessTime.ToFileTimeUtc());
+				helperStream.WriteLELong(_createTime.ToFileTimeUtc());
 				return ms.ToArray();
 			}
 		}
@@ -469,9 +473,9 @@ public DateTime LastAccessTime
 		}
 
 		#region Instance Fields
-		DateTime _lastAccessTime = DateTime.FromFileTime(0);
-		DateTime _lastModificationTime = DateTime.FromFileTime(0);
-		DateTime _createTime = DateTime.FromFileTime(0);
+		DateTime _lastAccessTime = DateTime.FromFileTimeUtc(0);
+		DateTime _lastModificationTime = DateTime.FromFileTimeUtc(0);
+		DateTime _createTime = DateTime.FromFileTimeUtc(0);
 		#endregion
 	}
 
@@ -575,33 +579,18 @@ public Stream GetStreamForTag(int tag)
 		/// <summary>
 		/// Get the <see cref="ITaggedData">tagged data</see> for a tag.
 		/// </summary>
-		/// <param name="tag">The tag to search for.</param>
+		/// <typeparam name="T">The tag to search for.</typeparam>
 		/// <returns>Returns a <see cref="ITaggedData">tagged value</see> or null if none found.</returns>
-		private ITaggedData GetData(short tag)
+		public T GetData<T>()
+			where T : class, ITaggedData, new()
 		{
-			ITaggedData result = null;
-			if (Find(tag)) {
-				result = Create(tag, _data, _readValueStart, _readValueLength);
-			}
-			return result;
-		}
-
-		static ITaggedData Create(short tag, byte[] data, int offset, int count)
-		{
-			ITaggedData result = null;
-			switch (tag) {
-			case 0x000A:
-				result = new NTTaggedData();
-				break;
-			case 0x5455:
-				result = new ExtendedUnixData();
-				break;
-			default:
-				result = new RawTaggedData(tag);
-				break;
+			T result = new T();
+			if (Find(result.TagID))
+			{
+				result.SetData(_data, _readValueStart, _readValueLength);
+				return result;
 			}
-			result.SetData(data, offset, count);
-			return result;
+			else return null;
 		}
 
 		/// <summary>

ICSharpCode.SharpZipLib/Zip/ZipFile.cs

@@ -1194,16 +1194,17 @@ long TestLocalHeader(ZipEntry entry, HeaderTest tests)
 				// Size can be verified only if it is known in the local header.
 				// it will always be known in the central header.
 				if (((localFlags & (int)GeneralBitFlags.Descriptor) == 0) ||
-					((size > 0) || (compressedSize > 0))) {
+					((size > 0 || compressedSize > 0) && entry.Size > 0)) {
 
-					if (size != entry.Size) {
+					if ((size != 0)
+						&& (size != entry.Size)) {
 						throw new ZipException(
 							string.Format("Size mismatch between central header({0}) and local header({1})",
 								entry.Size, size));
 					}
 
-					if (compressedSize != entry.CompressedSize &&
-						compressedSize != 0xFFFFFFFF && compressedSize != -1) {
+					if ((compressedSize != 0)
+						&& (compressedSize != entry.CompressedSize && compressedSize != 0xFFFFFFFF && compressedSize != -1)) {
 						throw new ZipException(
 							string.Format("Compressed size mismatch between central header({0}) and local header({1})",
 							entry.CompressedSize, compressedSize));
@@ -3196,7 +3197,7 @@ Stream CreateAndInitDecryptionStream(Stream baseStream, ZipEntry entry)
 					var decryptor = new ZipAESTransform(rawPassword_, saltBytes, blockSize, false);
 					byte[] pwdVerifyCalc = decryptor.PwdVerifier;
 					if (pwdVerifyCalc[0] != pwdVerifyRead[0] || pwdVerifyCalc[1] != pwdVerifyRead[1])
-						throw new Exception("Invalid password for AES");
+						throw new ZipException("Invalid password for AES");
 					result = new ZipAESStream(baseStream, decryptor, CryptoStreamMode.Read);
 				} else {
 					throw new ZipException("Decryption method not supported");