diff --git a/OneSTools.FileDatabase.sln b/OneSTools.FileDatabase.sln
new file mode 100644
index 0000000..91e7956
--- /dev/null
+++ b/OneSTools.FileDatabase.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30804.86
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OneSTools.FileDatabase", "OneSTools.FileDatabase\OneSTools.FileDatabase.csproj", "{EDF41082-9B3F-4AA2-9E60-C18901AFC25A}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OneSTools.FileDatabaseTestApp", "OneSTools.FileDatabaseTestApp\OneSTools.FileDatabaseTestApp.csproj", "{40FCEDB2-4C4B-4419-90BB-1BD80840AC05}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EDF41082-9B3F-4AA2-9E60-C18901AFC25A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EDF41082-9B3F-4AA2-9E60-C18901AFC25A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EDF41082-9B3F-4AA2-9E60-C18901AFC25A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EDF41082-9B3F-4AA2-9E60-C18901AFC25A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{40FCEDB2-4C4B-4419-90BB-1BD80840AC05}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{40FCEDB2-4C4B-4419-90BB-1BD80840AC05}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{40FCEDB2-4C4B-4419-90BB-1BD80840AC05}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{40FCEDB2-4C4B-4419-90BB-1BD80840AC05}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {37516B47-10E9-4C36-B852-487DB3568E24}
+	EndGlobalSection
+EndGlobal
diff --git a/OneSTools.FileDatabase/FileDatabaseConnection.cs b/OneSTools.FileDatabase/FileDatabaseConnection.cs
new file mode 100644
index 0000000..6187708
--- /dev/null
+++ b/OneSTools.FileDatabase/FileDatabaseConnection.cs
@@ -0,0 +1,104 @@
+using OneSTools.FileDatabase.HighLevel;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using OneSTools.FileDatabase.LowLevel;
+using System.Linq;
+using OneSTools.FileDatabase.LowLevel.Pages;
+using OneSTools.FileDatabase.LowLevel.Files;
+using OneSTools.BracketsFile;
+using System.Text;
+using System.Data.Common;
+using System.Collections.ObjectModel;
+using System.Data;
+
+namespace OneSTools.FileDatabase
+{
+    /// <summary>
+    /// Provides properties and methods for reading 1C file database data
+    /// </summary>
+    public class FileDatabaseConnection : IDisposable
+    {
+        private readonly string _path;
+        private FileDatabaseStream _stream;
+        private HeaderPage _headerPage;
+        private FreePagesPage _freePagesPage;
+        private DatabaseDescriptionFile _databaseDescriptionFile;
+
+        /// <summary>
+        /// The flag of database opening
+        /// </summary>
+        public bool Opened { get; private set; } = false;
+        /// <summary>
+        /// Version of the database file
+        /// </summary>
+        public string Version => _headerPage?.Version;
+        /// <summary>
+        /// Locale of the database
+        /// </summary>
+        public string Language => _databaseDescriptionFile?.Language;
+        /// <summary>
+        /// A collection of database tables
+        /// </summary>
+        public ReadOnlyCollection<Table> Tables { get; private set; } = null;
+
+        public FileDatabaseConnection(string path)
+             => _path = path;
+
+        /// <summary>
+        /// Open database file
+        /// </summary>
+        public void Open()
+        {
+            if (!File.Exists(_path))
+                throw new FileNotFoundException("Cannot find a database file", _path);
+
+            var stream = new FileStream(_path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+            _stream = new FileDatabaseStream(stream);
+
+            ReadStructure();
+
+            Opened = true;
+        }
+
+        private void ReadStructure()
+        {
+            _headerPage = new HeaderPage();
+            _headerPage.Read(_stream);
+
+            _stream.PageSize = _headerPage.PageSize;
+
+            _stream.CurrentPage = 1;
+            _freePagesPage = new FreePagesPage();
+            _freePagesPage.Read(_stream);
+
+            _databaseDescriptionFile = new DatabaseDescriptionFile(_stream);
+
+            var tables = new List<Table>();
+
+            for (int i = 0; i < _databaseDescriptionFile.TablesCount; i++)
+            {
+                var tableDefinitionData = _databaseDescriptionFile.ReadTableDefinitionData();
+                var tableDefinitionStr = Encoding.UTF8.GetString(tableDefinitionData);
+                var tableDefinitionNode = BracketsParser.ParseBlock(tableDefinitionStr);
+
+                var table = new Table(_stream, tableDefinitionNode);
+                tables.Add(table);
+            }
+
+            Tables = tables.AsReadOnly(); 
+        }
+
+        /// <summary>
+        /// Close database file
+        /// </summary>
+        public void Close()
+        {
+            Opened = false;
+            _stream?.Dispose();
+        }
+
+        public void Dispose()
+            => Close();
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/Field.cs b/OneSTools.FileDatabase/HighLevel/Field.cs
new file mode 100644
index 0000000..8459cd9
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/Field.cs
@@ -0,0 +1,85 @@
+using System;
+using OneSTools.BracketsFile;
+
+namespace OneSTools.FileDatabase.HighLevel
+{
+    public class Field
+    {
+        /// <summary>
+        /// Real size of the value (bytes)
+        /// </summary>
+        internal int MaxSize { get; private set; }
+        /// <summary>
+        /// Internal name of the field
+        /// </summary>
+        public string Name { get; private set; }
+        /// <summary>
+        /// Type of the field's value
+        /// </summary>
+        public FieldType Type { get; private set; }
+        /// <summary>
+        /// If the flag is True a value can be null
+        /// </summary>
+        public bool Nullable { get; private set; }
+        /// <summary>
+        /// Length of the value
+        /// </summary>
+        public int Length { get; private set; }
+        /// <summary>
+        /// "Numeric" value only - position of a point in a value
+        /// </summary>
+        public int Precision { get; private set; }
+        public string CaseSensitive { get; private set; }
+
+        internal void Read(BracketsNode node)
+        {
+            Name = node[0];
+
+            var type = (string)node[1];
+
+            Type = type switch
+            {
+                "B" => FieldType.Binary,
+                "L" => FieldType.Logical,
+                "N" => FieldType.Numeric,
+                "NC" => FieldType.NChar,
+                "NVC" => FieldType.NVarChar,
+                "RV" => FieldType.RowVersion,
+                "NT" => FieldType.NText,
+                "I" => FieldType.Image,
+                "DT" => FieldType.DateTime,
+                _ => throw new Exception($"{type} is unknown field type"),
+            };
+
+            Nullable = node[2];
+            Length = node[3];
+            Precision = node[4];
+            CaseSensitive = node[5];
+
+            CalculateRealSize();
+        }
+
+        public override string ToString()
+            => $"{Name} ({Type})";
+
+        private void CalculateRealSize()
+        {
+            MaxSize = Type switch
+            {
+                FieldType.Binary => Length,
+                FieldType.Logical => 1,
+                FieldType.Numeric => (Length + 1) / 2 + (Length + 1) % 2,
+                FieldType.NChar => Length * 2,
+                FieldType.NVarChar => Length * 2 + 2,
+                FieldType.RowVersion => 16,
+                FieldType.NText => 8,
+                FieldType.Image => 8,
+                FieldType.DateTime => 7,
+                _ => throw new NotImplementedException($"There is no alghorithm to calculate size of \"{Type}\" type"),
+            };
+
+            if (Nullable)
+                MaxSize++;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/FieldType.cs b/OneSTools.FileDatabase/HighLevel/FieldType.cs
new file mode 100644
index 0000000..99cc264
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/FieldType.cs
@@ -0,0 +1,42 @@
+namespace OneSTools.FileDatabase.HighLevel
+{
+    public enum FieldType
+    {
+        /// <summary>
+        /// Fixed-length binary data
+        /// </summary>
+        Binary,
+        /// <summary>
+        /// Boolean value
+        /// </summary>
+        Logical,
+        /// <summary>
+        /// Fixed point decimal
+        /// </summary>
+        Numeric,
+        /// <summary>
+        /// Fixed-length Unicode string
+        /// </summary>
+        NChar, // Unicode string
+        /// <summary>
+        /// Variable-length Unicode string
+        /// </summary>
+        NVarChar,
+        /// <summary>
+        /// Version of the row
+        /// </summary>
+        RowVersion,
+        /// <summary>
+        /// Unlimited-length Unicode string (UTF-16)
+        /// </summary>
+        NText,
+        /// <summary>
+        /// Unlimited-length binary data
+        /// </summary>
+        Image,
+        /// <summary>
+        /// Date and time
+        /// </summary>
+        DateTime
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/Index.cs b/OneSTools.FileDatabase/HighLevel/Index.cs
new file mode 100644
index 0000000..beefa6e
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/Index.cs
@@ -0,0 +1,40 @@
+using OneSTools.BracketsFile;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace OneSTools.FileDatabase.HighLevel
+{
+    public class Index
+    {
+        /// <summary>
+        /// Internal name of the index
+        /// </summary>
+        public string Name { get; private set; }
+        /// <summary>
+        /// Collection of the index fields
+        /// </summary>
+        public ReadOnlyCollection<IndexField> Fields { get; private set; } = null;
+
+        internal void Read(BracketsNode node)
+        {
+            var fields = new List<IndexField>();
+
+            Name = (string)node[0];
+
+            for (int i = 2; i < node.Count; i++)
+            {
+                var indexField = new IndexField();
+                indexField.Read(node[i]);
+
+                fields.Add(indexField);
+            }
+
+            Fields = fields.AsReadOnly();
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/IndexField.cs b/OneSTools.FileDatabase/HighLevel/IndexField.cs
new file mode 100644
index 0000000..7d15c52
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/IndexField.cs
@@ -0,0 +1,27 @@
+using OneSTools.BracketsFile;
+
+namespace OneSTools.FileDatabase.HighLevel
+{
+    public class IndexField
+    {
+        /// <summary>
+        /// Internal name of the index field
+        /// </summary>
+        public string Name { get; private set; }
+        /// <summary>
+        /// The length of the value
+        /// </summary>
+        public int Length { get; private set; }
+
+        internal void Read(BracketsNode node)
+        {
+            Name = node[0];
+            Length = node[1];
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/Table.cs b/OneSTools.FileDatabase/HighLevel/Table.cs
new file mode 100644
index 0000000..0156f11
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/Table.cs
@@ -0,0 +1,120 @@
+using OneSTools.BracketsFile;
+using System.Collections.Generic;
+using System.IO;
+using System;
+using OneSTools.FileDatabase.LowLevel;
+using System.Collections.ObjectModel;
+
+namespace OneSTools.FileDatabase.HighLevel
+{
+    public class Table
+    {
+        internal int MaxRowSize { get; private set; }
+        internal uint DataFilePage { get; private set; }
+        internal uint UnlimitedLengthDataFilePage { get; private set; }
+        internal uint IndexFilePage { get; private set; }
+
+        /// <summary>
+        /// Internal name of the table
+        /// </summary>
+        public string Name { get; private set; }
+        /// <summary>
+        /// Collection of table fields
+        /// </summary>
+        public ReadOnlyCollection<Field> Fields { get; private set; } = null;
+        /// <summary>
+        /// Collection of table indexes
+        /// </summary>
+        public ReadOnlyCollection<Index> Indexes { get; private set; } = null;
+        public bool RecordLock { get; private set; }
+        /// <summary>
+        /// Collection of table rows
+        /// </summary>
+        public IReadOnlyList<object[]> Rows { get; private set; } = null;
+
+        internal Table(FileDatabaseStream stream, BracketsNode node)
+        {
+            Name = node[0];
+
+            for (int i = 2; i < node.Count; i++)
+            {
+                var currentNode = node[i];
+                string nodeName = currentNode[0];
+
+                switch (nodeName)
+                {
+                    case "Fields":
+                        ReadFields(currentNode);
+                        break;
+                    case "Indexes":
+                        ReadIndexes(currentNode);
+                        break;
+                    case "Recordlock":
+                        RecordLock = currentNode[1];
+                        break;
+                    case "Files":
+                        DataFilePage = currentNode[1];
+                        UnlimitedLengthDataFilePage = currentNode[2];
+                        IndexFilePage = currentNode[3];
+                        break;
+                    default:
+                        throw new Exception($"{nodeName} is unknown table description node");
+                }
+            }
+
+            Rows = new TableRows(stream, this);
+        }
+
+        private void ReadFields(BracketsNode node)
+        {
+            var fields = new List<Field>();
+
+            for (int i = 1; i < node.Count; i++)
+            {
+                var field = new Field();
+                field.Read(node[i]);
+
+                if (field.Type == FieldType.RowVersion)
+                {
+                    fields.Insert(0, field);
+                }
+                else
+                    fields.Add(field);
+
+                MaxRowSize += field.MaxSize;
+            }
+
+            // add "free row" mark length
+            MaxRowSize++;
+
+            // add "short version" data length
+            if (fields.Count > 0 && fields[0].Type == FieldType.RowVersion && RecordLock)
+                MaxRowSize += 8;
+
+            Fields = fields.AsReadOnly();
+        }
+
+        private void ReadIndexes(BracketsNode node)
+        {
+            var indexes = new List<Index>();
+
+            if (node.Count > 1)
+            {
+                for (int i = 1; i < node.Count; i++)
+                {
+                    var index = new Index();
+                    index.Read(node[i]);
+
+                    indexes.Add(index);
+                }
+            }
+
+            Indexes = indexes.AsReadOnly();
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/HighLevel/TableRows.cs b/OneSTools.FileDatabase/HighLevel/TableRows.cs
new file mode 100644
index 0000000..2872010
--- /dev/null
+++ b/OneSTools.FileDatabase/HighLevel/TableRows.cs
@@ -0,0 +1,342 @@
+using System.Collections.Generic;
+using System.Text;
+using System;
+using OneSTools.FileDatabase.LowLevel;
+using OneSTools.FileDatabase.LowLevel.Files;
+using System.Buffers.Binary;
+using System.Collections;
+using System.Collections.ObjectModel;
+using System.Globalization;
+
+namespace OneSTools.FileDatabase.HighLevel
+{
+    internal class TableRows : IReadOnlyList<object[]>
+    {
+        private readonly FileDatabaseStream _stream;
+        private readonly Table _table;
+        private DataFile _dataFile;
+        private UnlimitedLengthDataFile _unlimitedLengthDataFile;
+
+        internal TableRows(FileDatabaseStream stream, Table table)
+        {
+            _stream = stream;
+            _table = table;
+        }
+
+        public object[] this[int index]
+        {
+            get
+            {
+                if (index >= Count)
+                    throw new IndexOutOfRangeException();
+                else
+                {
+                    return Get(index + 1);
+                }
+            }
+        }
+
+        public int Count
+        {
+            get
+            {
+                InitializeFiles();
+
+                return (int)(_dataFile?.RootPage.DataLength / Convert.ToUInt64(_table.MaxRowSize));
+            }
+        }
+
+        public IEnumerator<object[]> GetEnumerator()
+        {
+            for (int i = 0; i < Count; i++)
+            {
+                yield return Get(i + 1);
+            }
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        private void InitializeFiles()
+        {
+            if (_dataFile == null)
+            {
+                if (_table.DataFilePage != 0)
+                {
+                    _dataFile = new DataFile(_stream, _table.DataFilePage, _table.MaxRowSize, _table.Fields.Count > 0 && _table.Fields[0].Type != FieldType.RowVersion && _table.RecordLock);
+
+                    if (_dataFile.HasData())
+                    {
+                        _dataFile.GoToDataStartingPosition();
+                        _dataFile.GoToRow(1);
+                    }
+                }
+
+                if (_table.UnlimitedLengthDataFilePage != 0)
+                {
+                    _unlimitedLengthDataFile = new UnlimitedLengthDataFile(_stream, _table.UnlimitedLengthDataFilePage);
+
+                    if (_unlimitedLengthDataFile.HasData())
+                        _dataFile.GoToDataStartingPosition();
+                }
+            }
+        }
+
+        private object[] Get(int rowNumber)
+        {
+            InitializeFiles();
+
+            _dataFile.GoToRow(rowNumber);
+
+            var values = new object[_table.Fields.Count];
+
+            var rawData = _dataFile.ReadRow();
+
+            if (rawData == null)
+                return null;
+            else
+            {
+                var currentOffset = 0;
+
+                for (int i = 0; i < _table.Fields.Count; i++)
+                {
+                    var field = _table.Fields[i];
+
+                    var fieldData = rawData[currentOffset..(currentOffset + field.MaxSize)];
+
+                    currentOffset += field.MaxSize;
+
+                    values[i] = field.Type switch
+                    {
+                        FieldType.Binary => ReadBinary(fieldData, field.Nullable),
+                        FieldType.Logical => ReadLogical(fieldData, field.Nullable),
+                        FieldType.Numeric => ReadNumericValue(fieldData, field.Precision, field.Nullable),
+                        FieldType.NChar => ReadNChar(fieldData, field.Nullable),
+                        FieldType.NVarChar => ReadNVarChar(fieldData, field.Nullable),
+                        FieldType.RowVersion => ReadRowVersion(fieldData, field.Nullable),
+                        FieldType.NText => ReadNText(fieldData, field.Nullable),
+                        FieldType.Image => ReadImage(fieldData, field.Nullable),
+                        FieldType.DateTime => ReadDateTime(fieldData, field.Nullable),
+                        _ => throw new Exception($"Reading value for a field with type {field.Type} is not implemented")
+                    };
+                }
+
+                return values;
+            }
+        }
+
+        private byte[] ReadBinary(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                return valueData;
+            }
+        }
+
+        private bool? ReadLogical(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                return valueData[0] != 0;
+            }
+        }
+
+        private decimal? ReadNumericValue(byte[] data, int precision, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+                var doubleStr = new StringBuilder();
+                
+                var negative = ReadTetrad(valueData[0]) == 0;
+                if (negative)
+                    doubleStr.Append('-');
+
+                doubleStr.Append(ReadTetrad(valueData[0], true));
+
+                for (int i = 1; i < valueData.Length; i++)
+                {
+                    doubleStr.Append(ReadTetrad(valueData[i]));
+                    doubleStr.Append(ReadTetrad(valueData[i], true));
+                }
+
+                if (precision > 0)
+                    doubleStr.Insert(doubleStr.Length - 1 - precision, '.');
+
+                // remove last zero, I don't know what is it
+                doubleStr.Remove(doubleStr.Length - 1, 1);
+
+                return decimal.Parse(doubleStr.ToString(), new NumberFormatInfo() { NumberDecimalSeparator = "." });
+            }
+        }
+
+        private void AddNumberToNumeric(StringBuilder doubleStr, int value)
+        {
+            // don't add leading zeros
+            if (value != 0)
+                doubleStr.Append(value);
+            else if (doubleStr.Length > 0)
+                doubleStr.Append(value);
+        }
+
+        private string ReadNChar(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                return Encoding.Unicode.GetString(valueData);
+            }
+        }
+
+        private string ReadNVarChar(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                var length = BinaryPrimitives.ReadUInt16LittleEndian(valueData);
+
+                if (length == 0)
+                    return "";
+                else
+                    return Encoding.Unicode.GetString(valueData[2..(length * 2 + 2)]);
+            }
+        }
+
+        private DateTime? ReadDateTime(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                var year1 = ReadTetrad(valueData[0]);
+                var year2 = ReadTetrad(valueData[0], true);
+                var year3 = ReadTetrad(valueData[1]);
+                var year4 = ReadTetrad(valueData[1], true);
+                var year = int.Parse($"{year1}{year2}{year3}{year4}");
+
+                var month1 = ReadTetrad(valueData[2]);
+                var month2 = ReadTetrad(valueData[2], true);
+                var month = int.Parse($"{month1}{month2}");
+
+                var day1 = ReadTetrad(valueData[3]);
+                var day2 = ReadTetrad(valueData[3], true);
+                var day = int.Parse($"{day1}{day2}");
+
+                var hour1 = ReadTetrad(valueData[4]);
+                var hour2 = ReadTetrad(valueData[4], true);
+                var hour = int.Parse($"{hour1}{hour2}");
+
+                var minute1 = ReadTetrad(valueData[5]);
+                var minute2 = ReadTetrad(valueData[5], true);
+                var minute = int.Parse($"{minute1}{minute2}");
+
+                var second1 = ReadTetrad(valueData[6]);
+                var second2 = ReadTetrad(valueData[6], true);
+                var second = int.Parse($"{second1}{second2}");
+
+                if (year == 0 && month == 0 && day == 0 && hour == 0 && minute == 0 && second == 0)
+                    return DateTime.MinValue;
+                else
+                    return new DateTime(year, month, day, hour, minute, second);
+            }
+        }
+
+        private string ReadRowVersion(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+            else
+            {
+                var valueData = GetValueData(data, nullable);
+
+                var v1 = BinaryPrimitives.ReadUInt32LittleEndian(valueData[..5]);
+                var v2 = BinaryPrimitives.ReadUInt32LittleEndian(valueData[5..9]);
+                var v3 = BinaryPrimitives.ReadUInt32LittleEndian(valueData[9..13]);
+                var v4 = BinaryPrimitives.ReadUInt32LittleEndian(valueData[12..]);
+
+                return $"{v1}.{v2}.{v3}.{v4}";
+            }
+        }
+
+        private string ReadNText(byte[] data, bool nullable)
+        {
+            var valueData = ReadUnlimitedData(data, nullable);
+
+            if (valueData is null)
+                return null;
+            else
+                return Encoding.Unicode.GetString(valueData);
+        }
+
+        private byte[] ReadImage(byte[] data, bool nullable)
+        {
+            var valueData = ReadUnlimitedData(data, nullable);
+
+            if (valueData is null)
+                return null;
+            else
+                return valueData;
+        }
+
+        private byte[] ReadUnlimitedData(byte[] data, bool nullable)
+        {
+            if (!HasValue(data, nullable))
+                return null;
+
+            var valueData = GetValueData(data, nullable);
+
+            var blockNumber = BinaryPrimitives.ReadUInt32LittleEndian(valueData);
+            var dataLength = BinaryPrimitives.ReadUInt32LittleEndian(valueData[4..]);
+
+            _unlimitedLengthDataFile.GoToBlock(blockNumber);
+
+            var valueRawData = _unlimitedLengthDataFile.ReadBlockChain();
+
+            return valueRawData[..(int)dataLength];
+        }
+
+        private bool HasValue(byte[] data, bool nullable)
+        {
+            if (nullable)
+                return (bool)ReadLogical(data, false);
+            else
+                return true;
+        }
+
+        private byte[] GetValueData(byte[] data, bool nullable)
+        {
+            if (nullable)
+                return data[1..];
+            else
+                return data;
+        }
+
+        private int ReadTetrad(byte b, bool second = false)
+        {
+            if (second)
+                return b & 0b_0000_1111;
+            else
+                return b >> 4;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/FileDatabaseStream.cs b/OneSTools.FileDatabase/LowLevel/FileDatabaseStream.cs
new file mode 100644
index 0000000..df32111
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/FileDatabaseStream.cs
@@ -0,0 +1,55 @@
+using System;
+using System.IO;
+
+namespace OneSTools.FileDatabase.LowLevel
+{
+    internal class FileDatabaseStream : IDisposable
+    {
+        private readonly BinaryReader reader;
+
+        public long Position
+        {
+            get => reader.BaseStream.Position;
+            set => reader.BaseStream.Position = value;
+        }
+        public uint PageSize { get; set; }
+        public uint CurrentPage
+        {
+            get => (uint)(Position / PageSize);
+            set => reader.BaseStream.Position = PageSize * value;
+        }
+        public uint PositionOnPage => (uint)(Position - (CurrentPage * PageSize));
+
+        public FileDatabaseStream(Stream stream)
+        {
+            reader = new BinaryReader(stream);
+        }
+
+        public byte[] ReadBytes(int count)
+            => reader.ReadBytes(count);
+
+        public int ReadBytes(byte[] buffer, int offset, int count)
+        {
+            var forReading = MaxBytesCanTake(count);
+
+            return reader.Read(buffer, offset, (int)forReading);
+        }
+
+        public long SkipBytes(long count)
+        {
+            var forSkip = MaxBytesCanTake(count);
+
+            reader.BaseStream.Position += forSkip;
+
+            return forSkip;
+        }
+
+        private long MaxBytesCanTake(long requestedCount)
+            => Math.Min(((CurrentPage + 1) * PageSize) - Position, requestedCount);
+
+        public void Dispose()
+        {
+            reader?.Dispose();
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Files/DataFile.cs b/OneSTools.FileDatabase/LowLevel/Files/DataFile.cs
new file mode 100644
index 0000000..73fa3f7
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Files/DataFile.cs
@@ -0,0 +1,44 @@
+using System;
+
+namespace OneSTools.FileDatabase.LowLevel.Files
+{
+    internal class DataFile : InnerFile
+    {
+        private readonly int _rowSize;
+        private readonly bool _hasShortVersion;
+
+        public DataFile(FileDatabaseStream stream, uint rootPageNumber, int rowSize, bool hasShortVersion) : base(stream, rootPageNumber)
+        {
+            _rowSize = rowSize;
+            _hasShortVersion = hasShortVersion;
+        }
+
+        public void GoToRow(int number)
+        {
+            GoToDataStartingPosition();
+
+            SkipBytes(_rowSize * number);
+        }
+
+        public byte[] ReadRow()
+        {
+            while (!EndOfDataStream)
+            {
+                var data = ReadBytes(_rowSize);
+
+                // it's not a free row
+                if (data[0] == 0)
+                {
+                    _dataStreamPosition += Convert.ToUInt64(_rowSize);
+
+                    if (_hasShortVersion)
+                        return data[9..];
+                    else
+                        return data[1..];
+                }
+            }
+
+            return null;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Files/DatabaseDescriptionFile.cs b/OneSTools.FileDatabase/LowLevel/Files/DatabaseDescriptionFile.cs
new file mode 100644
index 0000000..8364b0a
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Files/DatabaseDescriptionFile.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Buffers.Binary;
+using System.Text;
+using System.Linq;
+
+namespace OneSTools.FileDatabase.LowLevel.Files
+{
+    internal class DatabaseDescriptionFile: UnlimitedLengthDataFile
+    {
+        private int _currentTableStartBlock = -1;
+
+        public string Language { get; private set; }
+        public uint TablesCount { get; private set; }
+        public uint[] TablesStartBlocks { get; private set; }
+
+        public DatabaseDescriptionFile(FileDatabaseStream stream) : base(stream, 2)
+        {
+            GoToDataStartingPosition();
+
+            SkipFirstBlock();
+
+            var ddfHeaderData = ReadBlockChain();
+
+            Language = Encoding.UTF8.GetString(ddfHeaderData[..(Array.IndexOf(ddfHeaderData, (byte)0))]);
+            TablesCount = BinaryPrimitives.ReadUInt32LittleEndian(ddfHeaderData[32..36]);
+            TablesStartBlocks = new uint[TablesCount];
+
+            for (int i = 0; i < TablesCount; i++)
+            {
+                var startIndex = 36 + i * 4;
+                var number = BinaryPrimitives.ReadUInt32LittleEndian(ddfHeaderData[startIndex..(startIndex + 4)]);
+
+                if (number == 0)
+                    break;
+
+                TablesStartBlocks[i] = number;
+            }
+        }
+
+        public byte[] ReadTableDefinitionData()
+        {
+            GoToNextTableStartBlock();
+
+            return ReadBlockChain();
+        }
+
+        private void GoToNextTableStartBlock()
+        {
+            _currentTableStartBlock++;
+
+            if (TablesStartBlocks.Length <= _currentTableStartBlock)
+                throw new Exception("There are no more data pages in the root page list");
+            else
+                GoToBlock(TablesStartBlocks[_currentTableStartBlock]);
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Files/InnerFile.cs b/OneSTools.FileDatabase/LowLevel/Files/InnerFile.cs
new file mode 100644
index 0000000..9e4d0b4
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Files/InnerFile.cs
@@ -0,0 +1,155 @@
+using OneSTools.FileDatabase.LowLevel.Pages;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace OneSTools.FileDatabase.LowLevel.Files
+{
+
+    internal abstract class InnerFile
+    {
+        protected readonly FileDatabaseStream _stream;
+        private uint _rootPageNumber;
+        private readonly List<uint> _dataPages = new List<uint>();
+        protected int _dataPage = -1;
+        private long _position = 0;
+        protected ulong _dataStreamPosition = 0;
+
+        public RootPage RootPage { get; private set; }
+        public List<IndexPage> IndexPages { get; private set; }
+        public bool EndOfDataStream => _dataStreamPosition >= RootPage.DataLength;
+
+        public InnerFile(FileDatabaseStream stream, uint rootPageNumber)
+        {
+            _stream = stream;
+            _rootPageNumber = rootPageNumber;
+
+            ReadRootPage();
+
+            if (RootPage.Type == InnerFileType.Full)
+            {
+                ReadIndexPages();
+
+                IndexPages.ForEach(c => _dataPages.AddRange(c.PageNumbers));
+            }
+            else
+                _dataPages.AddRange(RootPage.PageNumbers);
+        }
+
+        public bool HasData()
+            => RootPage.DataLength > 0;
+
+        public void GoToDataStartingPosition()
+        {
+            if (!HasData())
+                throw new Exception("The file doesn't contain data");
+
+            _dataPage = -1;
+
+            GoToNextDataPage();
+        }
+
+        protected byte[] ReadBytes(int count)
+        {
+            _stream.Position = _position;
+
+            if (_dataPage == -1)
+                GoToNextDataPage();
+
+            var buffer = new byte[count];
+
+            // Loop till read requested quantity
+            var read = 0;
+
+            while (read < count)
+            {
+                read += _stream.ReadBytes(buffer, read, count - read);
+
+                if (read < count)
+                    GoToNextDataPage();
+            }
+
+            if (PageReadingCompleted())
+                GoToNextDataPage();
+
+            _position = _stream.Position;
+
+            return buffer;
+        }
+
+        protected void SkipBytes(long count)
+        {
+            _stream.Position = _position;
+
+            if (_dataPage == -1)
+                GoToNextDataPage();
+
+            // Loop till read requested quantity
+            long skipped = 0;
+
+            while (skipped < count)
+            {
+                skipped += _stream.SkipBytes(count - skipped);
+
+                if (skipped < count)
+                    GoToNextDataPage();
+            }
+
+            if (PageReadingCompleted())
+                GoToNextDataPage();
+
+            _position = _stream.Position;
+        }
+
+        private void ReadRootPage()
+        {
+            _stream.CurrentPage = _rootPageNumber;
+
+            RootPage = new RootPage();
+            RootPage.Read(_stream);
+
+            _position = _stream.Position;
+        }
+
+        private void ReadIndexPages()
+        {
+            IndexPages = new List<IndexPage>();
+
+            foreach (var pageNumber in RootPage.PageNumbers)
+            {
+                if (pageNumber == 0)
+                    break;
+                else
+                {
+                    _stream.CurrentPage = pageNumber;
+
+                    var indexPage = new IndexPage();
+                    indexPage.Read(_stream);
+
+                    IndexPages.Add(indexPage);
+                }
+            }
+
+            _position = _stream.Position;
+        }
+
+        private bool PageReadingCompleted()
+            => _dataPages[_dataPage] != _stream.CurrentPage;
+
+        private void GoToNextDataPage()
+        {
+            _dataPage++;
+
+            if (_dataPages.Count <= _dataPage)
+                throw new Exception("There are no more data pages in the root page list");
+            else
+            {
+                var dataPage = _dataPages[_dataPage];
+
+                _stream.CurrentPage = dataPage;
+            }
+
+            _position = _stream.Position;
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Files/InnerFileType.cs b/OneSTools.FileDatabase/LowLevel/Files/InnerFileType.cs
new file mode 100644
index 0000000..4358f96
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Files/InnerFileType.cs
@@ -0,0 +1,8 @@
+namespace OneSTools.FileDatabase.LowLevel.Files
+{
+    public enum InnerFileType
+    {
+        Short = 0xFD1C,
+        Full = 0x01FD1C
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Files/UnlimitedLengthDataFile.cs b/OneSTools.FileDatabase/LowLevel/Files/UnlimitedLengthDataFile.cs
new file mode 100644
index 0000000..805e20a
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Files/UnlimitedLengthDataFile.cs
@@ -0,0 +1,54 @@
+using System.Buffers.Binary;
+using System.Collections.Generic;
+using System;
+
+namespace OneSTools.FileDatabase.LowLevel.Files
+{
+
+    internal class UnlimitedLengthDataFile : InnerFile
+    {
+        private const int UNLIMITED_DATA_BLOCK_MAX_SIZE = 256;
+
+        public UnlimitedLengthDataFile(FileDatabaseStream stream, uint rootPageNumber) : base(stream, rootPageNumber)
+        {
+
+        }
+
+        public void SkipFirstBlock()
+        {
+            // It skips the first block, cause it's a first block of the chain of free blocks
+            SkipBytes(UNLIMITED_DATA_BLOCK_MAX_SIZE);
+        }
+
+        public void GoToBlock(uint blockNumber)
+        {
+            GoToDataStartingPosition();
+
+            SkipBytes(blockNumber * UNLIMITED_DATA_BLOCK_MAX_SIZE);
+        }
+
+        public byte[] ReadBlockChain()
+        {
+            var buffer = new List<byte>();
+
+            while (true)
+            {
+                var nextBlock = BinaryPrimitives.ReadUInt32LittleEndian(ReadBytes(4));
+                var blockDatalength = BinaryPrimitives.ReadUInt16LittleEndian(ReadBytes(2));
+
+                if (blockDatalength > 0)
+                {
+                    var blockData = ReadBytes(blockDatalength);
+                    buffer.AddRange(blockData);
+                }
+
+                if (nextBlock == 0)
+                    break;
+                else
+                    GoToBlock(nextBlock);
+            }
+
+            return buffer.ToArray();
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Pages/FreePagesPage.cs b/OneSTools.FileDatabase/LowLevel/Pages/FreePagesPage.cs
new file mode 100644
index 0000000..08e8ea3
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Pages/FreePagesPage.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Buffers.Binary;
+
+namespace OneSTools.FileDatabase.LowLevel.Pages
+{
+    internal class FreePagesPage
+    {
+        public uint Type { get; private set; }
+        public uint PagesCount { get; private set; }
+        public int Version { get; private set; }
+        public int[] PageNumbers { get; private set; }
+
+        public void Read(FileDatabaseStream reader)
+        {
+            var type = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+            if (!(type is 0x0000FF1C))
+                throw new Exception($"{type} is not a type of \"Free pages\" block");
+
+            Type = type;
+            PagesCount = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+            Version = BinaryPrimitives.ReadInt32LittleEndian(reader.ReadBytes(4));
+
+            PageNumbers = new int[PagesCount];
+
+            for (int i = 0; i < PagesCount; i++)
+            {
+                var number = BinaryPrimitives.ReadInt32LittleEndian(reader.ReadBytes(4));
+
+                if (number == 0)
+                    break;
+
+                PageNumbers[i] = number;
+            }
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Pages/HeaderPage.cs b/OneSTools.FileDatabase/LowLevel/Pages/HeaderPage.cs
new file mode 100644
index 0000000..39ed9fc
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Pages/HeaderPage.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Buffers.Binary;
+using System.Text;
+
+namespace OneSTools.FileDatabase.LowLevel.Pages
+{
+    internal class HeaderPage
+    {
+        public string Signature { get; private set; }
+        public string Version { get; private set; }
+        public uint PagesCount { get; private set; }
+        public uint PageSize { get; private set; }
+
+        public void Read(FileDatabaseStream reader)
+        {
+            var signature = Encoding.UTF8.GetString(reader.ReadBytes(8));
+            if (signature != "1CDBMSV8")
+                throw new Exception("This file is not a 1C database");
+
+            var versionData = reader.ReadBytes(4);
+            var version = $"{versionData[0]}.{versionData[1]}.{versionData[2]}.{versionData[3]}";
+            if (version != "8.3.8.0")
+                throw new Exception($"{version} is unknown version");
+
+            Signature = signature;
+            Version = version;
+            PagesCount = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+            // skip 4 bytes of unknown value
+            reader.ReadBytes(4);
+
+            PageSize = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Pages/IndexPage.cs b/OneSTools.FileDatabase/LowLevel/Pages/IndexPage.cs
new file mode 100644
index 0000000..b6187ee
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Pages/IndexPage.cs
@@ -0,0 +1,30 @@
+using System.Buffers.Binary;
+using System.Collections.Generic;
+
+namespace OneSTools.FileDatabase.LowLevel.Pages
+{
+    internal class IndexPage
+    {
+        public ulong DataLength { get; private set; }
+        public uint[] PageNumbers { get; private set; }
+
+        public virtual void Read(FileDatabaseStream reader)
+        {
+            DataLength = BinaryPrimitives.ReadUInt64LittleEndian(reader.ReadBytes(8));
+
+            var pageNumbers = new List<uint>();
+
+            while (true)
+            {
+                var pageNumber = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+                if (pageNumber == 0)
+                    break;
+
+                pageNumbers.Add(pageNumber);
+            }
+
+            PageNumbers = pageNumbers.ToArray();
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/LowLevel/Pages/RootPage.cs b/OneSTools.FileDatabase/LowLevel/Pages/RootPage.cs
new file mode 100644
index 0000000..639cd14
--- /dev/null
+++ b/OneSTools.FileDatabase/LowLevel/Pages/RootPage.cs
@@ -0,0 +1,41 @@
+using OneSTools.FileDatabase.LowLevel.Files;
+using System.Buffers.Binary;
+using System.Collections.Generic;
+
+namespace OneSTools.FileDatabase.LowLevel.Pages
+{
+    internal class RootPage
+    {
+        public InnerFileType Type { get; private set; }
+        public string Version { get; private set; }
+        public ulong DataLength { get; private set; }
+        public uint[] PageNumbers { get; private set; }
+
+        public void Read(FileDatabaseStream reader)
+        {
+            Type = (InnerFileType)BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+            var v1 = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+            var v2 = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+            var v3 = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+            Version = $"{v1}.{v2}.{v3}";
+
+            DataLength = BinaryPrimitives.ReadUInt64LittleEndian(reader.ReadBytes(8));
+
+            var pageNumbers = new List<uint>();
+
+            while (true)
+            {
+                var pageNumber = BinaryPrimitives.ReadUInt32LittleEndian(reader.ReadBytes(4));
+
+                if (pageNumber == 0)
+                    break;
+
+                pageNumbers.Add(pageNumber);
+            }
+
+            PageNumbers = pageNumbers.ToArray();
+        }
+    }
+}
diff --git a/OneSTools.FileDatabase/OneSTools.FileDatabase.csproj b/OneSTools.FileDatabase/OneSTools.FileDatabase.csproj
new file mode 100644
index 0000000..9d93e88
--- /dev/null
+++ b/OneSTools.FileDatabase/OneSTools.FileDatabase.csproj
@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <AssemblyName>OneSTools.FileDatabase</AssemblyName>
+    <RootNamespace>OneSTools.FileDatabase</RootNamespace>
+    <Authors>Akpaev Evgeny</Authors>
+    <Company>Akpaev Evgeny</Company>
+    <Description>Библиотека для чтения данных файловых информационных баз 1С</Description>
+    <Copyright>Akpaev Evgeny</Copyright>
+    <PackageIcon>onestools_icon_nuget.png</PackageIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OneSTools.BracketsFile" Version="2.1.4" />
+    <PackageReference Include="System.Memory" Version="4.5.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\..\onestools_icon_nuget.png">
+      <Pack>True</Pack>
+      <PackagePath></PackagePath>
+    </None>
+  </ItemGroup>
+
+</Project>
diff --git a/OneSTools.FileDatabaseTestApp/OneSTools.FileDatabaseTestApp.csproj b/OneSTools.FileDatabaseTestApp/OneSTools.FileDatabaseTestApp.csproj
new file mode 100644
index 0000000..59ad671
--- /dev/null
+++ b/OneSTools.FileDatabaseTestApp/OneSTools.FileDatabaseTestApp.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <AssemblyName>OneSTools.FileDatabaseTestApp</AssemblyName>
+    <RootNamespace>OneSTools.FileDatabaseTestApp</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\OneSTools.FileDatabase\OneSTools.FileDatabase.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/OneSTools.FileDatabaseTestApp/Program.cs b/OneSTools.FileDatabaseTestApp/Program.cs
new file mode 100644
index 0000000..58c7a3a
--- /dev/null
+++ b/OneSTools.FileDatabaseTestApp/Program.cs
@@ -0,0 +1,46 @@
+using OneSTools.FileDatabase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using OneSTools.FileDatabase.HighLevel;
+
+namespace OneSTools.FileDatabaseTestApp
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var filePath = @"C:\Users\akpaev.e.ENTERPRISE\Desktop\Новая папка (2)\1Cv8.1CD";
+            var filePath2 = @"C:\Users\akpaev.e.ENTERPRISE\Documents\InfoBase10\1Cv8.1CD";
+
+            using var database = new FileDatabaseConnection(filePath2);
+            database.Open();
+
+            var table = database.Tables.FirstOrDefault(c => c.Name == "_Document38");
+
+            if (table != null)
+            {
+                foreach (var values in table.Rows)
+                {
+                    for (int i = 0; i < table.Fields.Count; i++)
+                    {
+                        var field = table.Fields[i];
+                        var value = values[i];
+
+                        // Or another one what you need
+                        if (field.Type == FieldType.Numeric)
+                        {
+                            var typedValue = (decimal?)value;
+                        }
+                        if (field.Type == FieldType.NChar
+                            || field.Type == FieldType.NText
+                            || field.Type == FieldType.NVarChar)
+                        {
+                            var typedValue = (string)value;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}