private void ReadNumberVector(List<byte[]> dataVector, int numFiles, Action<int, long?> action)
        {
            var defined = ReadOptionalBitVector(numFiles);

            using (CStreamSwitch streamSwitch = new CStreamSwitch())
            {
                streamSwitch.Set(this, dataVector);

                for (int i = 0; i < numFiles; i++)
                {
                    if (defined[i])
                        action(i, checked((long)ReadUInt64()));
                    else
                        action(i, null);
                }
            }
        }
 private void ReadAttributeVector(List<byte[]> dataVector, int numFiles, Action<int, uint?> action)
 {
     BitVector boolVector = ReadOptionalBitVector(numFiles);
     using (var streamSwitch = new CStreamSwitch())
     {
         streamSwitch.Set(this, dataVector);
         for (int i = 0; i < numFiles; i++)
         {
             if (boolVector[i])
                 action(i, ReadUInt32());
             else
                 action(i, null);
         }
     }
 }
        private void ReadHeader(ArchiveDatabase db, IPasswordProvider getTextPassword)
        {
            #if DEBUG
            Log.WriteLine("-- ReadHeader --");
            Log.PushIndent();
            #endif
            try
            {
                BlockType? type = ReadId();

                if (type == BlockType.ArchiveProperties)
                {
                    ReadArchiveProperties();
                    type = ReadId();
                }

                List<byte[]> dataVector = null;
                if (type == BlockType.AdditionalStreamsInfo)
                {
                    dataVector = ReadAndDecodePackedStreams(db.StartPositionAfterHeader, getTextPassword);
                    type = ReadId();
                }

                List<long> unpackSizes;
                List<uint?> digests;

                if (type == BlockType.MainStreamsInfo)
                {
                    ReadStreamsInfo(dataVector,
                                    out db.DataStartPosition,
                                    out db.PackSizes,
                                    out db.PackCRCs,
                                    out db.Folders,
                                    out db.NumUnpackStreamsVector,
                                    out unpackSizes,
                                    out digests);

                    db.DataStartPosition += db.StartPositionAfterHeader;
                    type = ReadId();
                }
                else
                {
                    unpackSizes = new List<long>(db.Folders.Count);
                    digests = new List<uint?>(db.Folders.Count);
                    db.NumUnpackStreamsVector = new List<int>(db.Folders.Count);
                    for (int i = 0; i < db.Folders.Count; i++)
                    {
                        var folder = db.Folders[i];
                        unpackSizes.Add(folder.GetUnpackSize());
                        digests.Add(folder.UnpackCRC);
                        db.NumUnpackStreamsVector.Add(1);
                    }
                }

                db.Files.Clear();

                if (type == BlockType.End)
                    return;

                if (type != BlockType.FilesInfo)
                    throw new InvalidOperationException();

                int numFiles = ReadNum();
            #if DEBUG
                Log.WriteLine("NumFiles: " + numFiles);
            #endif
                db.Files = new List<CFileItem>(numFiles);
                for (int i = 0; i < numFiles; i++)
                    db.Files.Add(new CFileItem());

                BitVector emptyStreamVector = new BitVector(numFiles);
                BitVector emptyFileVector = null;
                BitVector antiFileVector = null;
                int numEmptyStreams = 0;

                for (; ; )
                {
                    type = ReadId();
                    if (type == BlockType.End)
                        break;

                    long size = checked((long)ReadNumber()); // TODO: throw invalid data on negative
                    int oldPos = _currentReader.Offset;
                    switch (type)
                    {
                        case BlockType.Name:
                            using (var streamSwitch = new CStreamSwitch())
                            {
                                streamSwitch.Set(this, dataVector);
            #if DEBUG
                                Log.Write("FileNames:");
            #endif
                                for (int i = 0; i < db.Files.Count; i++)
                                {
                                    db.Files[i].Name = _currentReader.ReadString();
            #if DEBUG
                                    Log.Write("  " + db.Files[i].Name);
            #endif
                                }
            #if DEBUG
                                Log.WriteLine();
            #endif
                            }
                            break;
                        case BlockType.WinAttributes:
            #if DEBUG
                            Log.Write("WinAttributes:");
            #endif
                            ReadAttributeVector(dataVector, numFiles, delegate(int i, uint? attr)
                                                                          {
                                                                              db.Files[i].Attrib = attr;
            #if DEBUG
                                                                              Log.Write("  " + (attr.HasValue ? attr.Value.ToString("x8") : "n/a"));
            #endif
                                                                          });
            #if DEBUG
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.EmptyStream:
                            emptyStreamVector = ReadBitVector(numFiles);
            #if DEBUG

                            Log.Write("EmptyStream: ");
            #endif
                            for (int i = 0; i < emptyStreamVector.Length; i++)
                            {
                                if (emptyStreamVector[i])
                                {
            #if DEBUG
                                    Log.Write("x");
            #endif
                                    numEmptyStreams++;
                                }
                                else
                                {
            #if DEBUG
                                    Log.Write(".");
            #endif
                                }
                            }
            #if DEBUG
                            Log.WriteLine();
            #endif

                            emptyFileVector = new BitVector(numEmptyStreams);
                            antiFileVector = new BitVector(numEmptyStreams);
                            break;
                        case BlockType.EmptyFile:
                            emptyFileVector = ReadBitVector(numEmptyStreams);
            #if DEBUG
                            Log.Write("EmptyFile: ");
                            for (int i = 0; i < numEmptyStreams; i++)
                                Log.Write(emptyFileVector[i] ? "x" : ".");
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.Anti:
                            antiFileVector = ReadBitVector(numEmptyStreams);
            #if DEBUG
                            Log.Write("Anti: ");
                            for (int i = 0; i < numEmptyStreams; i++)
                                Log.Write(antiFileVector[i] ? "x" : ".");
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.StartPos:
            #if DEBUG
                            Log.Write("StartPos:");
            #endif
                            ReadNumberVector(dataVector, numFiles, delegate(int i, long? startPos)
                                                                       {
                                                                           db.Files[i].StartPos = startPos;
            #if DEBUG
                                                                           Log.Write("  " + (startPos.HasValue ? startPos.Value.ToString() : "n/a"));
            #endif
                                                                       });
            #if DEBUG
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.CTime:
            #if DEBUG
                            Log.Write("CTime:");
            #endif
                            ReadDateTimeVector(dataVector, numFiles, delegate(int i, DateTime? time)
                                                                         {
                                                                             db.Files[i].CTime = time;
            #if DEBUG
                                                                             Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
            #endif
                                                                         });
            #if DEBUG
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.ATime:
            #if DEBUG
                            Log.Write("ATime:");
            #endif
                            ReadDateTimeVector(dataVector, numFiles, delegate(int i, DateTime? time)
                                                                         {
                                                                             db.Files[i].ATime = time;
            #if DEBUG
                                                                             Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
            #endif
                                                                         });
            #if DEBUG
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.MTime:
            #if DEBUG
                            Log.Write("MTime:");
            #endif
                            ReadDateTimeVector(dataVector, numFiles, delegate(int i, DateTime? time)
                                                                         {
                                                                             db.Files[i].MTime = time;
            #if DEBUG
                                                                             Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
            #endif
                                                                         });
            #if DEBUG
                            Log.WriteLine();
            #endif
                            break;
                        case BlockType.Dummy:
            #if DEBUG
                            Log.Write("Dummy: " + size);
            #endif
                            for (long j = 0; j < size; j++)
                                if (ReadByte() != 0)
                                    throw new InvalidOperationException();
                            break;
                        default:
                            SkipData(size);
                            break;
                    }

                    // since 0.3 record sizes must be correct
                    bool checkRecordsSize = (db.MajorVersion > 0 || db.MinorVersion > 2);
                    if (checkRecordsSize && _currentReader.Offset - oldPos != size)
                        throw new InvalidOperationException();
                }

                int emptyFileIndex = 0;
                int sizeIndex = 0;
                for (int i = 0; i < numFiles; i++)
                {
                    CFileItem file = db.Files[i];
                    file.HasStream = !emptyStreamVector[i];
                    if (file.HasStream)
                    {
                        file.IsDir = false;
                        file.IsAnti = false;
                        file.Size = unpackSizes[sizeIndex];
                        file.Crc = digests[sizeIndex];
                        sizeIndex++;
                    }
                    else
                    {
                        file.IsDir = !emptyFileVector[emptyFileIndex];
                        file.IsAnti = antiFileVector[emptyFileIndex];
                        emptyFileIndex++;
                        file.Size = 0;
                        file.Crc = null;
                    }
                }
            }
            finally
            {
            #if DEBUG
                Log.PopIndent();
            #endif
            }
        }
        private void ReadUnpackInfo(List<byte[]> dataVector, out List<CFolder> folders)
        {
            #if DEBUG
            Log.WriteLine("-- ReadUnpackInfo --");
            Log.PushIndent();
            #endif
            try
            {
                WaitAttribute(BlockType.Folder);
                int numFolders = ReadNum();
            #if DEBUG
                Log.WriteLine("NumFolders: {0}", numFolders);
            #endif

                using (CStreamSwitch streamSwitch = new CStreamSwitch())
                {
                    streamSwitch.Set(this, dataVector);
                    //folders.Clear();
                    //folders.Reserve(numFolders);
                    folders = new List<CFolder>(numFolders);
                    int index = 0;
                    for (int i = 0; i < numFolders; i++)
                    {
                        var f = new CFolder { FirstPackStreamId = index };
                        folders.Add(f);
                        GetNextFolderItem(f);
                        index += f.PackStreams.Count;
                    }
                }

                WaitAttribute(BlockType.CodersUnpackSize);
            #if DEBUG
                Log.WriteLine("UnpackSizes:");
            #endif
                for (int i = 0; i < numFolders; i++)
                {
                    CFolder folder = folders[i];
            #if DEBUG
                    Log.Write("  #" + i + ":");
            #endif
                    int numOutStreams = folder.GetNumOutStreams();
                    for (int j = 0; j < numOutStreams; j++)
                    {
                        long size = checked((long)ReadNumber());
            #if DEBUG
                        Log.Write("  " + size);
            #endif
                        folder.UnpackSizes.Add(size);
                    }
            #if DEBUG
                    Log.WriteLine();
            #endif
                }

                for (; ; )
                {
                    BlockType? type = ReadId();
                    if (type == BlockType.End)
                        return;

                    if (type == BlockType.CRC)
                    {
                        List<uint?> crcs = ReadHashDigests(numFolders);
                        for (int i = 0; i < numFolders; i++)
                            folders[i].UnpackCRC = crcs[i];
                        continue;
                    }

                    SkipData();
                }
            }
            finally
            {
            #if DEBUG
                Log.PopIndent();
            #endif
            }
        }
        public ArchiveDatabase ReadDatabase(IPasswordProvider pass)
        {
            var db = new ArchiveDatabase();
            db.Clear();

            db.MajorVersion = _header[6];
            db.MinorVersion = _header[7];

            if (db.MajorVersion != 0)
                throw new InvalidOperationException();

            uint crcFromArchive = DataReader.Get32(_header, 8);
            long nextHeaderOffset = (long)DataReader.Get64(_header, 0xC);
            long nextHeaderSize = (long)DataReader.Get64(_header, 0x14);
            uint nextHeaderCrc = DataReader.Get32(_header, 0x1C);

            uint crc = CRC.kInitCRC;
            crc = CRC.Update(crc, nextHeaderOffset);
            crc = CRC.Update(crc, nextHeaderSize);
            crc = CRC.Update(crc, nextHeaderCrc);
            crc = CRC.Finish(crc);

            if (crc != crcFromArchive)
                throw new InvalidOperationException();

            db.StartPositionAfterHeader = _streamOrigin + 0x20;

            // empty header is ok
            if (nextHeaderSize == 0)
            {
                db.Fill();
                return db;
            }

            if (nextHeaderOffset < 0 || nextHeaderSize < 0 || nextHeaderSize > Int32.MaxValue)
                throw new InvalidOperationException();

            if (nextHeaderOffset > _streamEnding - db.StartPositionAfterHeader)
                throw new IndexOutOfRangeException();

            _stream.Seek(nextHeaderOffset, SeekOrigin.Current);

            byte[] header = new byte[nextHeaderSize];
            _stream.ReadExact(header, 0, header.Length);

            if (CRC.Finish(CRC.Update(CRC.kInitCRC, header, 0, header.Length)) != nextHeaderCrc)
                throw new InvalidOperationException();

            using (CStreamSwitch streamSwitch = new CStreamSwitch())
            {
                streamSwitch.Set(this, header);

                BlockType? type = ReadId();
                if (type != BlockType.Header)
                {
                    if (type != BlockType.EncodedHeader)
                        throw new InvalidOperationException();

                    var dataVector = ReadAndDecodePackedStreams(db.StartPositionAfterHeader, pass);

                    // compressed header without content is odd but ok
                    if (dataVector.Count == 0)
                    {
                        db.Fill();
                        return db;
                    }

                    if (dataVector.Count != 1)
                        throw new InvalidOperationException();

                    streamSwitch.Set(this, dataVector[0]);

                    if (ReadId() != BlockType.Header)
                        throw new InvalidOperationException();
                }

                ReadHeader(db, pass);
            }
            db.Fill();
            return db;
        }
 private void ReadNumberVector(List<byte[]> dataVector, int numFiles, Action<int, long?> action)
 {
     BitVector vector = this.ReadOptionalBitVector(numFiles);
     using (CStreamSwitch switch2 = new CStreamSwitch())
     {
         switch2.Set(this, dataVector);
         for (int i = 0; i < numFiles; i++)
         {
             if (vector[i])
             {
                 action(i, new long?((long) this.ReadUInt64()));
             }
             else
             {
                 long? nullable = null;
                 action(i, nullable);
             }
         }
     }
 }
        private void ReadHeader(ArchiveDatabase db, IPasswordProvider getTextPassword)
        {
            Action<int, uint?> action = null;
            Action<int, long?> action2 = null;
            Action<int, DateTime?> action3 = null;
            Action<int, DateTime?> action4 = null;
            Action<int, DateTime?> action5 = null;
            SharpCompress.Compressor.LZMA.Log.WriteLine("-- ReadHeader --");
            SharpCompress.Compressor.LZMA.Log.PushIndent("  ");
            try
            {
                List<long> list2;
                List<uint?> list3;
                int num;
                long num6;
                int num7;
                bool flag2;
                BlockType? nullable = this.ReadId();
                if (((BlockType) nullable) == BlockType.ArchiveProperties)
                {
                    this.ReadArchiveProperties();
                    nullable = this.ReadId();
                }
                List<byte[]> dataVector = null;
                if (((BlockType) nullable) == BlockType.AdditionalStreamsInfo)
                {
                    dataVector = this.ReadAndDecodePackedStreams(db.StartPositionAfterHeader, getTextPassword);
                    nullable = this.ReadId();
                }
                if (((BlockType) nullable) == BlockType.MainStreamsInfo)
                {
                    this.ReadStreamsInfo(dataVector, out db.DataStartPosition, out db.PackSizes, out db.PackCRCs, out db.Folders, out db.NumUnpackStreamsVector, out list2, out list3);
                    db.DataStartPosition += db.StartPositionAfterHeader;
                    nullable = this.ReadId();
                }
                else
                {
                    list2 = new List<long>(db.Folders.Count);
                    list3 = new List<uint?>(db.Folders.Count);
                    db.NumUnpackStreamsVector = new List<int>(db.Folders.Count);
                    for (num = 0; num < db.Folders.Count; num++)
                    {
                        CFolder folder = db.Folders[num];
                        list2.Add(folder.GetUnpackSize());
                        list3.Add(folder.UnpackCRC);
                        db.NumUnpackStreamsVector.Add(1);
                    }
                }
                db.Files.Clear();
                if (((BlockType) nullable) == BlockType.End)
                {
                    return;
                }
                if (((BlockType) nullable) != BlockType.FilesInfo)
                {
                    throw new InvalidOperationException();
                }
                int capacity = this.ReadNum();
                SharpCompress.Compressor.LZMA.Log.WriteLine("NumFiles: " + capacity);
                db.Files = new List<CFileItem>(capacity);
                num = 0;
                while (num < capacity)
                {
                    db.Files.Add(new CFileItem());
                    num++;
                }
                BitVector vector = new BitVector(capacity);
                BitVector vector2 = null;
                BitVector vector3 = null;
                int length = 0;
                goto Label_06FC;
            Label_02DA:
                nullable = this.ReadId();
                if (((BlockType) nullable) == BlockType.End)
                {
                    goto Label_0704;
                }
                long size = (long) this.ReadNumber();
                int offset = this._currentReader.Offset;
                BlockType valueOrDefault = nullable.GetValueOrDefault();
                if (nullable.HasValue)
                {
                    switch (valueOrDefault)
                    {
                        case BlockType.EmptyStream:
                            vector = this.ReadBitVector(capacity);
                            SharpCompress.Compressor.LZMA.Log.Write("EmptyStream: ");
                            num = 0;
                            goto Label_04AD;

                        case BlockType.EmptyFile:
                            vector2 = this.ReadBitVector(length);
                            SharpCompress.Compressor.LZMA.Log.Write("EmptyFile: ");
                            num = 0;
                            goto Label_0519;

                        case BlockType.Anti:
                            vector3 = this.ReadBitVector(length);
                            SharpCompress.Compressor.LZMA.Log.Write("Anti: ");
                            num = 0;
                            goto Label_056E;

                        case BlockType.Name:
                            goto Label_0370;

                        case BlockType.CTime:
                            goto Label_05BC;

                        case BlockType.ATime:
                            goto Label_05F3;

                        case BlockType.MTime:
                            goto Label_062A;

                        case BlockType.WinAttributes:
                            goto Label_0420;

                        case BlockType.StartPos:
                            goto Label_0585;

                        case BlockType.Dummy:
                            SharpCompress.Compressor.LZMA.Log.Write("Dummy: " + size);
                            num6 = 0L;
                            goto Label_0697;
                    }
                }
                goto Label_06A5;
            Label_0370:
                using (CStreamSwitch switch2 = new CStreamSwitch())
                {
                    switch2.Set(this, dataVector);
                    SharpCompress.Compressor.LZMA.Log.Write("FileNames:");
                    num = 0;
                    while (num < db.Files.Count)
                    {
                        db.Files[num].Name = this._currentReader.ReadString();
                        SharpCompress.Compressor.LZMA.Log.Write("  " + db.Files[num].Name);
                        num++;
                    }
                    SharpCompress.Compressor.LZMA.Log.WriteLine();
                }
                goto Label_06B0;
            Label_0420:
                SharpCompress.Compressor.LZMA.Log.Write("WinAttributes:");
                if (action == null)
                {
                    action = delegate (int i, uint? attr) {
                        db.Files[i].Attrib = attr;
                        SharpCompress.Compressor.LZMA.Log.Write("  " + (attr.HasValue ? attr.Value.ToString("x8") : "n/a"));
                    };
                }
                this.ReadAttributeVector(dataVector, capacity, action);
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_0471:
                if (vector[num])
                {
                    SharpCompress.Compressor.LZMA.Log.Write("x");
                    length++;
                }
                else
                {
                    SharpCompress.Compressor.LZMA.Log.Write(".");
                }
                num++;
            Label_04AD:
                if (num < vector.Length)
                {
                    goto Label_0471;
                }
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                vector2 = new BitVector(length);
                vector3 = new BitVector(length);
                goto Label_06B0;
            Label_04F5:
                SharpCompress.Compressor.LZMA.Log.Write(vector2[num] ? "x" : ".");
                num++;
            Label_0519:
                if (num < length)
                {
                    goto Label_04F5;
                }
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_054A:
                SharpCompress.Compressor.LZMA.Log.Write(vector3[num] ? "x" : ".");
                num++;
            Label_056E:
                if (num < length)
                {
                    goto Label_054A;
                }
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_0585:
                SharpCompress.Compressor.LZMA.Log.Write("StartPos:");
                if (action2 == null)
                {
                    action2 = delegate (int i, long? startPos) {
                        db.Files[i].StartPos = startPos;
                        SharpCompress.Compressor.LZMA.Log.Write("  " + (startPos.HasValue ? startPos.Value.ToString() : "n/a"));
                    };
                }
                this.ReadNumberVector(dataVector, capacity, action2);
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_05BC:
                SharpCompress.Compressor.LZMA.Log.Write("CTime:");
                if (action3 == null)
                {
                    action3 = delegate (int i, DateTime? time) {
                        db.Files[i].CTime = time;
                        SharpCompress.Compressor.LZMA.Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
                    };
                }
                this.ReadDateTimeVector(dataVector, capacity, action3);
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_05F3:
                SharpCompress.Compressor.LZMA.Log.Write("ATime:");
                if (action4 == null)
                {
                    action4 = delegate (int i, DateTime? time) {
                        db.Files[i].ATime = time;
                        SharpCompress.Compressor.LZMA.Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
                    };
                }
                this.ReadDateTimeVector(dataVector, capacity, action4);
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_062A:
                SharpCompress.Compressor.LZMA.Log.Write("MTime:");
                if (action5 == null)
                {
                    action5 = delegate (int i, DateTime? time) {
                        db.Files[i].MTime = time;
                        SharpCompress.Compressor.LZMA.Log.Write("  " + (time.HasValue ? time.Value.ToString() : "n/a"));
                    };
                }
                this.ReadDateTimeVector(dataVector, capacity, action5);
                SharpCompress.Compressor.LZMA.Log.WriteLine();
                goto Label_06B0;
            Label_067B:
                if (this.ReadByte() != 0)
                {
                    throw new InvalidOperationException();
                }
                num6 += 1L;
            Label_0697:
                if (num6 < size)
                {
                    goto Label_067B;
                }
                goto Label_06B0;
            Label_06A5:
                this.SkipData(size);
            Label_06B0:
                if (((db.MajorVersion > 0) || (db.MinorVersion > 2)) && ((this._currentReader.Offset - offset) != size))
                {
                    throw new InvalidOperationException();
                }
            Label_06FC:
                flag2 = true;
                goto Label_02DA;
            Label_0704:
                num7 = 0;
                int num8 = 0;
                for (num = 0; num < capacity; num++)
                {
                    CFileItem item = db.Files[num];
                    item.HasStream = !vector[num];
                    if (item.HasStream)
                    {
                        item.IsDir = false;
                        item.IsAnti = false;
                        item.Size = list2[num8];
                        item.Crc = list3[num8];
                        num8++;
                    }
                    else
                    {
                        item.IsDir = !vector2[num7];
                        item.IsAnti = vector3[num7];
                        num7++;
                        item.Size = 0L;
                        item.Crc = null;
                    }
                }
            }
            finally
            {
                SharpCompress.Compressor.LZMA.Log.PopIndent();
            }
        }
 private void ReadAttributeVector(List<byte[]> dataVector, int numFiles, Action<int, uint?> action)
 {
     BitVector vector = this.ReadOptionalBitVector(numFiles);
     using (CStreamSwitch switch2 = new CStreamSwitch())
     {
         switch2.Set(this, dataVector);
         for (int i = 0; i < numFiles; i++)
         {
             if (vector[i])
             {
                 action(i, new uint?(this.ReadUInt32()));
             }
             else
             {
                 uint? nullable = null;
                 action(i, nullable);
             }
         }
     }
 }
 public ArchiveDatabase ReadDatabase(IPasswordProvider pass)
 {
     ArchiveDatabase db = new ArchiveDatabase();
     db.Clear();
     db.MajorVersion = this._header[6];
     db.MinorVersion = this._header[7];
     if (db.MajorVersion != 0)
     {
         throw new InvalidOperationException();
     }
     uint num = DataReader.Get32(this._header, 8);
     long num2 = (long) DataReader.Get64(this._header, 12);
     long num3 = (long) DataReader.Get64(this._header, 20);
     uint num4 = DataReader.Get32(this._header, 0x1c);
     uint maxValue = uint.MaxValue;
     if (CRC.Finish(CRC.Update(CRC.Update(CRC.Update(maxValue, num2), num3), num4)) != num)
     {
         throw new InvalidOperationException();
     }
     db.StartPositionAfterHeader = this._streamOrigin + 0x20L;
     if (num3 == 0L)
     {
         db.Fill();
         return db;
     }
     if (((num2 < 0L) || (num3 < 0L)) || (num3 > 0x7fffffffL))
     {
         throw new InvalidOperationException();
     }
     if (num2 > (this._streamEnding - db.StartPositionAfterHeader))
     {
         throw new IndexOutOfRangeException();
     }
     this._stream.Seek(num2, SeekOrigin.Current);
     byte[] buffer = new byte[num3];
     Utils.ReadExact(this._stream, buffer, 0, buffer.Length);
     if (CRC.Finish(CRC.Update(uint.MaxValue, buffer, 0, buffer.Length)) != num4)
     {
         throw new InvalidOperationException();
     }
     using (CStreamSwitch switch2 = new CStreamSwitch())
     {
         switch2.Set(this, buffer);
         BlockType? nullable = this.ReadId();
         if (((BlockType) nullable) != BlockType.Header)
         {
             if (((BlockType) nullable) != BlockType.EncodedHeader)
             {
                 throw new InvalidOperationException();
             }
             List<byte[]> list = this.ReadAndDecodePackedStreams(db.StartPositionAfterHeader, pass);
             if (list.Count == 0)
             {
                 db.Fill();
                 return db;
             }
             if (list.Count != 1)
             {
                 throw new InvalidOperationException();
             }
             switch2.Set(this, list[0]);
             if (((BlockType) this.ReadId()) != BlockType.Header)
             {
                 throw new InvalidOperationException();
             }
         }
         this.ReadHeader(db, pass);
     }
     db.Fill();
     return db;
 }
 private void ReadUnpackInfo(List<byte[]> dataVector, out List<CFolder> folders)
 {
     SharpCompress.Compressor.LZMA.Log.WriteLine("-- ReadUnpackInfo --");
     SharpCompress.Compressor.LZMA.Log.PushIndent("  ");
     try
     {
         int num3;
         BlockType? nullable;
         bool flag;
         this.WaitAttribute(BlockType.Folder);
         int capacity = this.ReadNum();
         SharpCompress.Compressor.LZMA.Log.WriteLine("NumFolders: {0}", new object[] { capacity });
         using (CStreamSwitch switch2 = new CStreamSwitch())
         {
             switch2.Set(this, dataVector);
             folders = new List<CFolder>(capacity);
             int num2 = 0;
             num3 = 0;
             while (num3 < capacity)
             {
                 CFolder folder2 = new CFolder();
                 folder2.FirstPackStreamId = num2;
                 CFolder item = folder2;
                 folders.Add(item);
                 this.GetNextFolderItem(item);
                 num2 += item.PackStreams.Count;
                 num3++;
             }
         }
         this.WaitAttribute(BlockType.CodersUnpackSize);
         SharpCompress.Compressor.LZMA.Log.WriteLine("UnpackSizes:");
         for (num3 = 0; num3 < capacity; num3++)
         {
             CFolder folder3 = folders[num3];
             SharpCompress.Compressor.LZMA.Log.Write("  #" + num3 + ":");
             int numOutStreams = folder3.GetNumOutStreams();
             for (int i = 0; i < numOutStreams; i++)
             {
                 long num6 = (long) this.ReadNumber();
                 SharpCompress.Compressor.LZMA.Log.Write("  " + num6);
                 folder3.UnpackSizes.Add(num6);
             }
             SharpCompress.Compressor.LZMA.Log.WriteLine();
         }
         goto Label_01F9;
     Label_016F:
         nullable = this.ReadId();
         if (((BlockType) nullable) == BlockType.End)
         {
             return;
         }
         if (((BlockType) nullable) == BlockType.CRC)
         {
             List<uint?> list = this.ReadHashDigests(capacity);
             for (num3 = 0; num3 < capacity; num3++)
             {
                 folders[num3].UnpackCRC = list[num3];
             }
         }
         else
         {
             this.SkipData();
         }
     Label_01F9:
         flag = true;
         goto Label_016F;
     }
     finally
     {
         SharpCompress.Compressor.LZMA.Log.PopIndent();
     }
 }