void ExtractEntry(ZipEntry entry) { bool doExtraction = NameIsValid(entry.Name) && entry.IsCompressionMethodSupported(); // TODO: Fire delegate were compression method not supported. string dirName = null; string targetName = null; if (doExtraction) { string entryFileName; if (Path.IsPathRooted(entry.Name)) { string workName = Path.GetPathRoot(entry.Name); workName = entry.Name.Substring(workName.Length); entryFileName = Path.Combine(Path.GetDirectoryName(workName), Path.GetFileName(entry.Name)); } else { entryFileName = entry.Name; } targetName = Path.Combine(targetDirectory_, entryFileName); dirName = Path.GetDirectoryName(Path.GetFullPath(targetName)); doExtraction = (entryFileName.Length > 0); } if (doExtraction && !Directory.Exists(dirName)) { if (!entry.IsDirectory || CreateEmptyDirectories) { try { Directory.CreateDirectory(dirName); } catch { doExtraction = false; } } } if (doExtraction && entry.IsFile) { ExtractFileEntry(entry, targetName); } }
private void ExtractEntry(ZipEntry entry) { bool flag = FastZip.NameIsValid(entry.Name) && entry.IsCompressionMethodSupported(); string path = null; string text = null; if (flag) { string text3; if (Path.IsPathRooted(entry.Name)) { string text2 = Path.GetPathRoot(entry.Name); text2 = entry.Name.Substring(text2.Length); text3 = Path.Combine(Path.GetDirectoryName(text2), Path.GetFileName(entry.Name)); } else { text3 = entry.Name; } text = Path.Combine(this.targetDirectory_, text3); path = Path.GetDirectoryName(Path.GetFullPath(text)); flag = (text3.Length > 0); } if (flag && !Directory.Exists(path)) { if (entry.IsDirectory) { if (!this.CreateEmptyDirectories) { goto IL_B9; } } try { Directory.CreateDirectory(path); } catch { flag = false; } } IL_B9: if (flag && entry.IsFile) { this.ExtractFileEntry(entry, text); } }
/// <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); } 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 ReaderDelegate(InitialRead); } else { internalReader = new ReaderDelegate(ReadingNotSupported); } return entry; }
void ExtractEntry(ZipEntry entry) { bool doExtraction = false; string nameText = entry.Name; if ( entry.IsFile ) { // TODO: Translate invalid names allowing extraction still. doExtraction = NameIsValid(nameText) && entry.IsCompressionMethodSupported(); } else if ( entry.IsDirectory ) { doExtraction = NameIsValid(nameText); } // TODO: Fire delegate were compression method not supported, or name is invalid? string dirName = null; string targetName = null; if ( doExtraction ) { // Handle invalid entry names by chopping of path root. if (Path.IsPathRooted(nameText)) { string workName = Path.GetPathRoot(nameText); nameText = nameText.Substring(workName.Length); } if ( nameText.Length > 0 ) { targetName = Path.Combine(targetDirectory_, nameText); if ( entry.IsDirectory ) { dirName = targetName; } else { dirName = Path.GetDirectoryName(Path.GetFullPath(targetName)); } } else { doExtraction = false; } } if ( doExtraction && !Directory.Exists(dirName) ) { if ( !entry.IsDirectory || CreateEmptyDirectories ) { try { Directory.CreateDirectory(dirName); } catch (Exception ex) { doExtraction = false; if ( events_ != null ) { if ( entry.IsDirectory ) { continueRunning_ = events_.OnDirectoryFailure(targetName, ex); } else { continueRunning_ = events_.OnFileFailure(targetName, ex); } } else { continueRunning_ = false; } } } } if ( doExtraction && entry.IsFile ) { ExtractFileEntry(entry, targetName); } }
/// <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); } 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 ReaderDelegate(InitialRead); } else { internalReader = new ReaderDelegate(ReadingNotSupported); } return(entry); }
/// <summary> /// Test a local header against that provided from the central directory /// </summary> /// <param name="entry"> /// The entry to test against /// </param> /// <param name="tests">The type of <see cref="HeaderTest">tests</see> to carry out.</param> /// <returns>The offset of the entries data in the file</returns> long TestLocalHeader(ZipEntry entry, HeaderTest tests) { lock(baseStream_) { bool testHeader = (tests & HeaderTest.Header) != 0; bool testData = (tests & HeaderTest.Extract) != 0; baseStream_.Seek(offsetOfFirstEntry + entry.Offset, SeekOrigin.Begin); if ((int)ReadLEUint() != ZipConstants.LocalHeaderSignature) { throw new ZipException(string.Format("Wrong local header signature @{0:X}", offsetOfFirstEntry + entry.Offset)); } short extractVersion = ( short )ReadLEUshort(); short localFlags = ( short )ReadLEUshort(); short compressionMethod = ( short )ReadLEUshort(); short fileTime = ( short )ReadLEUshort(); short fileDate = ( short )ReadLEUshort(); uint crcValue = ReadLEUint(); long size = ReadLEUint(); long compressedSize = ReadLEUint(); int storedNameLength = ReadLEUshort(); int extraDataLength = ReadLEUshort(); // eliminate system id from version (use version only) extractVersion &= 0x00FF; if ( testData ) { if ( entry.IsFile ) { if ( !entry.IsCompressionMethodSupported() ) { throw new ZipException("Compression method not supported"); } if ( (extractVersion > ZipConstants.VersionMadeBy) || ((extractVersion > 20) && (extractVersion < ZipConstants.VersionZip64)) ) { throw new ZipException(string.Format("Version required to extract this entry not supported ({0})", extractVersion)); } if ( (localFlags & ( int )(GeneralBitFlags.Patched | GeneralBitFlags.StrongEncryption | GeneralBitFlags.EnhancedCompress | GeneralBitFlags.HeaderMasked)) != 0 ) { throw new ZipException("The library does not support the zip version required to extract this entry"); } } } if ( testHeader ) { if ((extractVersion <= 63) && // Ignore later versions as we dont know about them.. (extractVersion != 10) && (extractVersion != 11) && (extractVersion != 20) && (extractVersion != 21) && (extractVersion != 25) && (extractVersion != 27) && (extractVersion != 45) && (extractVersion != 46) && (extractVersion != 50) && (extractVersion != 51) && (extractVersion != 52) && (extractVersion != 61) && (extractVersion != 62) && (extractVersion != 63) ) { throw new ZipException(string.Format("Version required to extract this entry is invalid ({0})", extractVersion)); } // Local entry flags dont have reserved bit set on. if ( (localFlags & ( int )(GeneralBitFlags.ReservedPKware4 | GeneralBitFlags.ReservedPkware14 | GeneralBitFlags.ReservedPkware15)) != 0 ) { throw new ZipException("Reserved bit flags cannot be set."); } // Encryption requires extract version >= 20 if ( ((localFlags & ( int )GeneralBitFlags.Encrypted) != 0) && (extractVersion < 20) ) { throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion)); } // Strong encryption requires encryption flag to be set and extract version >= 50. if ( (localFlags & (int)GeneralBitFlags.StrongEncryption) != 0 ) { if ( (localFlags & (int)GeneralBitFlags.Encrypted) == 0 ) { throw new ZipException("Strong encryption flag set but encryption flag is not set"); } if ( extractVersion < 50 ) { throw new ZipException(string.Format("Version required to extract this entry is too low for encryption ({0})", extractVersion)); } } // Patched entries require extract version >= 27 if ( ((localFlags & ( int )GeneralBitFlags.Patched) != 0) && (extractVersion < 27) ) { throw new ZipException(string.Format("Patched data requires higher version than ({0})", extractVersion)); } // Central header flags match local entry flags. if ( localFlags != entry.Flags ) { throw new ZipException("Central header/local header flags mismatch"); } // Central header compression method matches local entry if ( entry.CompressionMethod != ( CompressionMethod )compressionMethod ) { throw new ZipException("Central header/local header compression method mismatch"); } // Strong encryption and extract version match if ( (localFlags & ( int )GeneralBitFlags.StrongEncryption) != 0 ) { if ( extractVersion < 62 ) { throw new ZipException("Strong encryption flag set but version not high enough"); } } if ( (localFlags & ( int )GeneralBitFlags.HeaderMasked) != 0 ) { if ( (fileTime != 0) || (fileDate != 0) ) { throw new ZipException("Header masked set but date/time values non-zero"); } } if ( (localFlags & ( int )GeneralBitFlags.Descriptor) == 0 ) { if ( crcValue != (uint)entry.Crc ) { throw new ZipException("Central header/local header crc mismatch"); } } // Crc valid for empty entry. if ( (size == 0) && (compressedSize == 0) ) { if ( crcValue != 0 ) { throw new ZipException("Invalid CRC for empty entry"); } } // TODO: make test more correct... can't compare lengths as was done originally as this can fail for MBCS strings // Assuming a code page at this point is not valid? Best is to store the name length in the ZipEntry probably if ( entry.Name.Length > storedNameLength ) { throw new ZipException("File name length mismatch"); } byte[] nameData = new byte[storedNameLength]; StreamUtils.ReadFully(baseStream_, nameData); string localName = ZipConstants.ConvertToStringExt(localFlags, nameData); // Central directory and local entry name match if ( localName != entry.Name ) { throw new ZipException("Central header and local header file name mismatch"); } // Directories have zero size. if ( entry.IsDirectory ) { if ( (compressedSize != 0) || (size != 0) ) { throw new ZipException("Directory cannot have size"); } } if ( !ZipNameTransform.IsValidName(localName, true) ) { throw new ZipException("Name is invalid"); } byte[] data = new byte[extraDataLength]; StreamUtils.ReadFully(baseStream_, data); ZipExtraData ed = new ZipExtraData(data); // Extra data / zip64 checks if ( ed.Find(1) ) { // Zip64 extra data but 'extract version' is too low if ( extractVersion < ZipConstants.VersionZip64 ) { throw new ZipException( string.Format("Extra data contains Zip64 information but version {0}.{1} is not high enough", extractVersion / 10, extractVersion % 10)); } // Zip64 extra data but size fields dont indicate its required. if ( (( uint )size != uint.MaxValue) && (( uint )compressedSize != uint.MaxValue) ) { throw new ZipException("Entry sizes not correct for Zip64"); } size = ed.ReadLong(); compressedSize = ed.ReadLong(); } else { // No zip64 extra data but entry requires it. if ( (extractVersion >= ZipConstants.VersionZip64) && ((( uint )size == uint.MaxValue) || (( uint )compressedSize == uint.MaxValue)) ) { throw new ZipException("Required Zip64 extended information missing"); } } } int extraLength = storedNameLength + extraDataLength; return offsetOfFirstEntry + entry.Offset + ZipConstants.LocalHeaderBaseSize + extraLength; } }
private void ExtractEntry(ZipEntry entry) { bool flag = entry.IsCompressionMethodSupported(); string name = entry.Name; if (flag) { if (entry.IsFile) { name = _extractNameTransform.TransformFile(name); } else if (entry.IsDirectory) { name = _extractNameTransform.TransformDirectory(name); } flag = (name != null) && (name.Length != 0); } string path = null; if (flag) { if (entry.IsDirectory) { path = name; } else { path = Path.GetDirectoryName(Path.GetFullPath(name)); } } if ((flag && !Directory.Exists(path)) && (!entry.IsDirectory || CreateEmptyDirectories)) { try { Directory.CreateDirectory(path); } catch (Exception exception) { flag = false; if (_events != null) { if (entry.IsDirectory) { _continueRunning = _events.OnDirectoryFailure(name, exception); } else { _continueRunning = _events.OnFileFailure(name, exception); } } else { _continueRunning = false; throw; } } } if (flag && entry.IsFile) { ExtractFileEntry(entry, name); } }
public bool IsCompressionMethodSupported() { return(ZipEntry.IsCompressionMethodSupported(this.CompressionMethod)); }
void ExtractEntry(ZipEntry entry) { bool doExtraction = NameIsValid(entry.Name) && entry.IsCompressionMethodSupported(); // TODO: Fire delegate were compression method not supported. string dirName = null; string targetName = null; if ( doExtraction ) { string entryFileName; if (Path.IsPathRooted(entry.Name)) { string workName = Path.GetPathRoot(entry.Name); workName = entry.Name.Substring(workName.Length); entryFileName = Path.Combine(Path.GetDirectoryName(workName), Path.GetFileName(entry.Name)); } else { entryFileName = entry.Name; } targetName = Path.Combine(targetDirectory_, entryFileName); dirName = Path.GetDirectoryName(Path.GetFullPath(targetName)); doExtraction = (entryFileName.Length > 0); } if ( doExtraction && !Directory.Exists(dirName) ) { if ( !entry.IsDirectory || CreateEmptyDirectories ) { try { Directory.CreateDirectory(dirName); } catch { doExtraction = false; } } } if ( doExtraction && entry.IsFile ) { ExtractFileEntry(entry, targetName); } }
public ZipEntry GetNextEntry() { if (_crc == null) { throw new InvalidOperationException("Closed."); } if (_entry != null) { CloseEntry(); } var num = InputBuffer.ReadLeInt(); switch (num) { case ZipConstants.CentralHeaderSignature: case ZipConstants.EndOfCentralDirectorySignature: case ZipConstants.CentralHeaderDigitalSignature: case ZipConstants.ArchiveExtraDataSignature: case 0x6064b50: Close(); return null; case 0x30304b50: case ZipConstants.SpanningSignature: num = InputBuffer.ReadLeInt(); break; } if (num != ZipConstants.LocalHeaderSignature) { throw new ZipException("Wrong Local header signature: 0x" + $"{num:X}"); } var versionRequiredToExtract = (short)InputBuffer.ReadLeShort(); _flags = InputBuffer.ReadLeShort(); _method = InputBuffer.ReadLeShort(); var num3 = (uint)InputBuffer.ReadLeInt(); var num4 = InputBuffer.ReadLeInt(); Csize = InputBuffer.ReadLeInt(); _size = InputBuffer.ReadLeInt(); var num5 = InputBuffer.ReadLeShort(); var num6 = InputBuffer.ReadLeShort(); var flag = (_flags & 1) == 1; var buffer = new byte[num5]; InputBuffer.ReadRawBuffer(buffer); var name = ZipConstants.ConvertToStringExt(_flags, buffer); _entry = new ZipEntry(name, versionRequiredToExtract) { Flags = _flags, CompressionMethod = (CompressionMethod) _method }; if ((_flags & 8) == 0) { _entry.Crc = num4 & 0xffffffffL; _entry.Size = _size & 0xffffffffL; _entry.CompressedSize = Csize & 0xffffffffL; _entry.CryptoCheckValue = (byte)((num4 >> 0x18) & 0xff); } else { if (num4 != 0) { _entry.Crc = num4 & 0xffffffffL; } if (_size != 0L) { _entry.Size = _size & 0xffffffffL; } if (Csize != 0L) { _entry.CompressedSize = Csize & 0xffffffffL; } _entry.CryptoCheckValue = (byte)((num3 >> 8) & 0xff); } _entry.DosTime = num3; if (num6 > 0) { var buffer2 = new byte[num6]; InputBuffer.ReadRawBuffer(buffer2); _entry.ExtraData = buffer2; } _entry.ProcessExtraData(true); if (_entry.CompressedSize >= 0L) { Csize = _entry.CompressedSize; } if (_entry.Size >= 0L) { _size = _entry.Size; } if ((_method == 0) && ((!flag && (Csize != _size)) || (flag && ((Csize - 12L) != _size)))) { throw new ZipException("Stored, but compressed != uncompressed"); } if (_entry.IsCompressionMethodSupported()) { _internalReader = InitialRead; } else { _internalReader = ReadingNotSupported; } return _entry; }
public ZipEntry GetNextEntry() { if (_crc == null) { throw new InvalidOperationException("Closed."); } if (_entry != null) { CloseEntry(); } var num = InputBuffer.ReadLeInt(); switch (num) { case ZipConstants.CentralHeaderSignature: case ZipConstants.EndOfCentralDirectorySignature: case ZipConstants.CentralHeaderDigitalSignature: case ZipConstants.ArchiveExtraDataSignature: case 0x6064b50: Close(); return(null); case 0x30304b50: case ZipConstants.SpanningSignature: num = InputBuffer.ReadLeInt(); break; } if (num != ZipConstants.LocalHeaderSignature) { throw new ZipException("Wrong Local header signature: 0x" + $"{num:X}"); } var versionRequiredToExtract = (short)InputBuffer.ReadLeShort(); _flags = InputBuffer.ReadLeShort(); _method = InputBuffer.ReadLeShort(); var num3 = (uint)InputBuffer.ReadLeInt(); var num4 = InputBuffer.ReadLeInt(); Csize = InputBuffer.ReadLeInt(); _size = InputBuffer.ReadLeInt(); var num5 = InputBuffer.ReadLeShort(); var num6 = InputBuffer.ReadLeShort(); var flag = (_flags & 1) == 1; var buffer = new byte[num5]; InputBuffer.ReadRawBuffer(buffer); var name = ZipConstants.ConvertToStringExt(_flags, buffer); _entry = new ZipEntry(name, versionRequiredToExtract) { Flags = _flags, CompressionMethod = (CompressionMethod)_method }; if ((_flags & 8) == 0) { _entry.Crc = num4 & 0xffffffffL; _entry.Size = _size & 0xffffffffL; _entry.CompressedSize = Csize & 0xffffffffL; _entry.CryptoCheckValue = (byte)((num4 >> 0x18) & 0xff); } else { if (num4 != 0) { _entry.Crc = num4 & 0xffffffffL; } if (_size != 0L) { _entry.Size = _size & 0xffffffffL; } if (Csize != 0L) { _entry.CompressedSize = Csize & 0xffffffffL; } _entry.CryptoCheckValue = (byte)((num3 >> 8) & 0xff); } _entry.DosTime = num3; if (num6 > 0) { var buffer2 = new byte[num6]; InputBuffer.ReadRawBuffer(buffer2); _entry.ExtraData = buffer2; } _entry.ProcessExtraData(true); if (_entry.CompressedSize >= 0L) { Csize = _entry.CompressedSize; } if (_entry.Size >= 0L) { _size = _entry.Size; } if ((_method == 0) && ((!flag && (Csize != _size)) || (flag && ((Csize - 12L) != _size)))) { throw new ZipException("Stored, but compressed != uncompressed"); } if (_entry.IsCompressionMethodSupported()) { _internalReader = InitialRead; } else { _internalReader = ReadingNotSupported; } return(_entry); }
private long TestLocalHeader(ZipEntry entry, HeaderTest tests) { lock (_baseStream) { var flag = (tests & HeaderTest.Header) != 0; var flag2 = (tests & HeaderTest.Extract) != 0; _baseStream.Seek(_offsetOfFirstEntry + entry.Offset, SeekOrigin.Begin); if (ReadLeUint() != ZipConstants.LocalHeaderSignature) { throw new ZipException($"Wrong local header signature @{_offsetOfFirstEntry + entry.Offset:X}"); } var num = (short)ReadLeUshort(); var flags = (short)ReadLeUshort(); var num3 = (short)ReadLeUshort(); var num4 = (short)ReadLeUshort(); var num5 = (short)ReadLeUshort(); var num6 = ReadLeUint(); long num7 = ReadLeUint(); long num8 = ReadLeUint(); int num9 = ReadLeUshort(); int num10 = ReadLeUshort(); var buffer = new byte[num9]; StreamUtils.ReadFully(_baseStream, buffer); var buffer2 = new byte[num10]; StreamUtils.ReadFully(_baseStream, buffer2); var data = new ZipExtraData(buffer2); if (data.Find(1)) { num8 = data.ReadLong(); num7 = data.ReadLong(); if ((flags & 8) != 0) { if ((num8 != -1L) && (num8 != entry.Size)) { throw new ZipException("Size invalid for descriptor"); } if ((num7 != -1L) && (num7 != entry.CompressedSize)) { throw new ZipException("Compressed size invalid for descriptor"); } } } else if ((num >= 0x2d) && ((((uint)num8) == uint.MaxValue) || (((uint)num7) == uint.MaxValue))) { throw new ZipException("Required Zip64 extended information missing"); } if (flag2 && entry.IsFile) { if (!entry.IsCompressionMethodSupported()) { throw new ZipException("Compression method not supported"); } if ((num > 0x33) || ((num > 20) && (num < 0x2d))) { throw new ZipException($"Version required to extract this entry not supported ({num})"); } if ((flags & 0x3060) != 0) { throw new ZipException("The library does not support the zip version required to extract this entry"); } } if (flag) { if (((((num <= 0x3f) && (num != 10)) && ((num != 11) && (num != 20))) && (((num != 0x15) && (num != 0x19)) && ((num != 0x1b) && (num != 0x2d)))) && ((((num != ZipConstants.CentralHeaderBaseSize) && (num != 50)) && ((num != 0x33) && (num != 0x34))) && (((num != 0x3d) && (num != 0x3e)) && (num != 0x3f)))) { throw new ZipException($"Version required to extract this entry is invalid ({num})"); } if ((flags & 0xc010) != 0) { throw new ZipException("Reserved bit flags cannot be set."); } if (((flags & 1) != 0) && (num < 20)) { throw new ZipException( $"Version required to extract this entry is too low for encryption ({num})"); } if ((flags & 0x40) != 0) { if ((flags & 1) == 0) { throw new ZipException("Strong encryption flag set but encryption flag is not set"); } if (num < 50) { throw new ZipException( $"Version required to extract this entry is too low for encryption ({num})"); } } if (((flags & 0x20) != 0) && (num < 0x1b)) { throw new ZipException($"Patched data requires higher version than ({num})"); } if (flags != entry.Flags) { throw new ZipException("Central header/local header flags mismatch"); } if (entry.CompressionMethod != ((CompressionMethod)num3)) { throw new ZipException("Central header/local header compression method mismatch"); } if (entry.Version != num) { throw new ZipException("Extract version mismatch"); } if (((flags & 0x40) != 0) && (num < 0x3e)) { throw new ZipException("Strong encryption flag set but version not high enough"); } if (((flags & 0x2000) != 0) && ((num4 != 0) || (num5 != 0))) { throw new ZipException("Header masked set but date/time values non-zero"); } if (((flags & 8) == 0) && (num6 != ((uint)entry.Crc))) { throw new ZipException("Central header/local header crc mismatch"); } if (((num8 == 0L) && (num7 == 0L)) && (num6 != 0)) { throw new ZipException("Invalid CRC for empty entry"); } if (entry.Name.Length > num9) { throw new ZipException("File name length mismatch"); } var name = ZipConstants.ConvertToStringExt(flags, buffer); if (name != entry.Name) { throw new ZipException("Central header and local header file name mismatch"); } if (entry.IsDirectory) { if (num8 > 0L) { throw new ZipException("Directory cannot have size"); } if (entry.IsCrypted) { if (num7 > 14L) { throw new ZipException("Directory compressed size invalid"); } } else if (num7 > 2L) { throw new ZipException("Directory compressed size invalid"); } } if (!ZipNameTransform.IsValidName(name, true)) { throw new ZipException("Name is invalid"); } } if ((((flags & 8) == 0) || (num8 > 0L)) || (num7 > 0L)) { if (num8 != entry.Size) { throw new ZipException( $"Size mismatch between central header({entry.Size}) and local header({num8})"); } if (((num7 != entry.CompressedSize) && (num7 != 0xffffffffL)) && (num7 != -1L)) { throw new ZipException( $"Compressed size mismatch between central header({entry.CompressedSize}) and local header({num7})"); } } var num11 = num9 + num10; return (((_offsetOfFirstEntry + entry.Offset) + 30L) + num11); } }