Migrate to dotnet8 and fix warnings

.idea/.idea.CsvView/.idea/avalonia.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AvaloniaProject">
+    <option name="projectPerEditor">
+      <map>
+        <entry key="CsvView/App.axaml" value="CsvView/CsvView.csproj" />
+        <entry key="CsvView/MainWindow.axaml" value="CsvView/CsvView.csproj" />
+      </map>
+    </option>
+  </component>
+</project>

CsvLib.Tests/ByteArraySearcherTests.cs

@@ -7,60 +7,75 @@ public class ByteArraySearcherTests
     [Fact]
     public void Contains__EmptyNeedle_ReturnsTrue()
     {
-        byte[] haystack = { 1, 2, 3, 4, 5 };
+        // --- Arrange
+        byte[] haystack = [1, 2, 3, 4, 5,];
         byte[] needle = Array.Empty<byte>();
         ByteArraySearcher searcher = new(needle);
 
+        // --- Act
         bool result = searcher.Contains(haystack);
 
+        // --- Assert
         Assert.True(result);
     }
 
     [Fact]
     public void Contains__NeedleAtBeginning_ReturnsTrue()
     {
-        byte[] haystack = { 1, 2, 3, 4, 5 };
-        byte[] needle = { 1, 2, 3 };
+        // --- Arrange
+        byte[] haystack = [1, 2, 3, 4, 5,];
+        byte[] needle = [1, 2, 3,];
         ByteArraySearcher searcher = new(needle);
 
+        // --- Act
         bool result = searcher.Contains(haystack);
 
+        // --- Assert
         Assert.True(result);
     }
 
     [Fact]
     public void Contains__NeedleInMiddle_ReturnsTrue()
     {
-        byte[] haystack = { 1, 2, 3, 4, 5 };
-        byte[] needle = { 3, 4 };
+        // --- Arrange
+        byte[] haystack = [1, 2, 3, 4, 5,];
+        byte[] needle = [3, 4,];
         ByteArraySearcher searcher = new(needle);
 
+        // --- Act
         bool result = searcher.Contains(haystack);
 
+        // --- Assert
         Assert.True(result);
     }
 
     [Fact]
     public void Contains__NeedleAtEnd_ReturnsTrue()
     {
-        byte[] haystack = { 1, 2, 3, 4, 5 };
-        byte[] needle = { 4, 5 };
+        // --- Arrange
+        byte[] haystack = [1, 2, 3, 4, 5,];
+        byte[] needle = [4, 5,];
         ByteArraySearcher searcher = new(needle);
 
+        // --- Act
         bool result = searcher.Contains(haystack);
 
+        // --- Assert
         Assert.True(result);
     }
 
     [Fact]
     public void Contains__NeedleNotPresent_ReturnsFalse()
     {
-        byte[] haystack = { 1, 2, 3, 4, 5 };
-        byte[] needle = { 5, 6, 7 };
+        // --- Arrange
+        byte[] haystack = [1, 2, 3, 4, 5,];
+        byte[] needle = [5, 6, 7,];
         ByteArraySearcher searcher = new(needle);
 
+        // --- Act
         bool result = searcher.Contains(haystack);
 
+        // --- Assert
         Assert.False(result);
     }
 }

CsvLib.Tests/CsvFieldIndexerTests.cs

@@ -5,7 +5,6 @@ namespace CvsLib;
 
 public class CsvFieldIndexerTests
 {
-
     #region GenerateIndex
 
     [Fact]
@@ -51,10 +50,11 @@ public class CsvFieldIndexerTests
     public void GenerateIndex__TwoLinesOfPainText__TwoRows()
     {
         // --- Arrange
-        StringReader sr = new("""
-                              Hello World
-                              Hello World
-                              """);
+        StringReader sr = new(
+            """
+              Hello World
+              Hello World
+              """);
 
         // --- Act
         CsvFieldIndexer indexer = new();
@@ -80,10 +80,11 @@ public class CsvFieldIndexerTests
     public void GenerateIndex__TwoLinesOfQuotedText__TwoRows()
     {
         // --- Arrange
-        StringReader sr = new("""
-                              "Hello World"
-                              "Hello World"
-                              """);
+        StringReader sr = new(
+            """
+              "Hello World"
+              "Hello World"
+              """);
 
         // --- Act
         CsvFieldIndexer indexer = new();
@@ -109,10 +110,11 @@ public class CsvFieldIndexerTests
     public void GenerateIndex__TwoLinesWithTwoQuotedColumns__TwoRowsTwoFields()
     {
         // --- Arrange
-        StringReader sr = new("""
-                              "Hello","World"
-                              "Hello","World"
-                              """);
+        StringReader sr = new(
+            """
+              "Hello","World"
+              "Hello","World"
+              """);
 
         // --- Act
         CsvFieldIndexer indexer = new();
@@ -142,10 +144,11 @@ public class CsvFieldIndexerTests
     public void GenerateIndex__TwoLinesWithTwoQuotedColumnsWithUnicode__TwoRowsTwoFields()
     {
         // --- Arrange
-        StringReader sr = new("""
-                              "Hélló","Wórld"
-                              "Hélló","Wórld"
-                              """);
+        StringReader sr = new(
+            """
+              "Hélló","Wórld"
+              "Hélló","Wórld"
+              """);
 
         // --- Act
         CsvFieldIndexer indexer = new();
@@ -174,15 +177,16 @@ public class CsvFieldIndexerTests
     #endregion GenerateIndex
 
     #region Search
-    
+
     [Fact]
     public void Search__TwoLinesWithTwoQuotedColumns__OneIndexFirstRow()
     {
         // --- Arrange
-        string strText = """
-                         "Hello","test"
-                         "Hello","World"
-                         """;
+        const string strText = 
+            """
+            "Hello","test"
+            "Hello","World"
+            """;
         StringReader sr = new(strText);
         CsvFieldIndexer indexer = new();
         indexer.GenerateIndex(sr);
@@ -202,10 +206,11 @@ public class CsvFieldIndexerTests
     public void Search__TwoLinesWithTwoQuotedColumns__OneIndexSecondRow()
     {
         // --- Arrange
-        string strText = """
-                         "Hello","World"
-                         "Hello","test"
-                         """;
+        const string strText =
+            """
+            "Hello","World"
+            "Hello","test"
+            """;
         StringReader sr = new(strText);
         CsvFieldIndexer indexer = new();
         indexer.GenerateIndex(sr);
@@ -225,10 +230,11 @@ public class CsvFieldIndexerTests
     public void Search__TwoLinesWithTwoQuotedColumnsTwoMatches__OneIndexSecondRow()
     {
         // --- Arrange
-        string strText = """
-                         "Hello","World"
-                         "test","test"
-                         """;
+        const string strText =
+            """
+            "Hello","World"
+            "test","test"
+            """;
         StringReader sr = new(strText);
         CsvFieldIndexer indexer = new();
         indexer.GenerateIndex(sr);
@@ -243,7 +249,7 @@ public class CsvFieldIndexerTests
         Assert.Single(indexes);
         Assert.Equal(16, indexes[0]);
     }
-    
+
     #endregion Search
-    
+
 }

CsvLib.Tests/CsvLib.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net7.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <RootNamespace>CvsLib</RootNamespace>

CsvLib/BufferedTextReader.cs

@@ -1,57 +1,52 @@
 using System.IO;
 using System.Text;
 
-namespace CsvLib
+namespace CsvLib;
+
+public class BufferedTextReader : TextReader
 {
-    public class BufferedTextReader : TextReader
+    private readonly TextReader _baseReader;
+    private readonly StringBuilder _sbBuffer = new();
+
+    private readonly Encoding _currentEncoding = Encoding.Default;
+
+    public BufferedTextReader(TextReader baseReader)
     {
-        private readonly TextReader _baseReader;
-        private int _position;
-        private readonly StringBuilder _sbBuffer = new();
-
-        private readonly Encoding _currentEncoding = Encoding.Default;
-
-        public BufferedTextReader(TextReader baseReader)
+        _baseReader = baseReader;
+        if (baseReader is StreamReader streamReader)
         {
-            _baseReader = baseReader;
-            if (baseReader is StreamReader streamReader)
-            {
-                _currentEncoding = streamReader.CurrentEncoding;
-            }
-        }
-
-        public override int Read()
-        {
-            int read = _baseReader.Read();
-            if (read > 127)
-            {
-                int count = _currentEncoding.GetByteCount(((char)read).ToString());
-                _position += count;
-            }
-            else
-            {
-                _position++;
-            }
-            if (read != -1)
-            {
-                _sbBuffer.Append((char)read);
-            }
-            return read;
-        }
-
-        public int Position
-        {
-            get { return _position; }
-        }
-
-        public string GetBuffer()
-        {
-            return _sbBuffer.ToString();
-        }
-
-        public void CleanBuffer()
-        {
-            _sbBuffer.Clear();
+            _currentEncoding = streamReader.CurrentEncoding;
         }
     }
-}
+
+    public override int Read()
+    {
+        int read = _baseReader.Read();
+        if (read > 127)
+        {
+            int count = _currentEncoding.GetByteCount(((char)read).ToString());
+            Position += count;
+        }
+        else
+        {
+            Position++;
+        }
+        if (read != -1)
+        {
+            _sbBuffer.Append((char)read);
+        }
+        return read;
+    }
+
+    public int Position { get; private set; }
+
+    public string GetBuffer()
+    {
+        return _sbBuffer.ToString();
+    }
+
+    public void CleanBuffer()
+    {
+        _sbBuffer.Clear();
+    }
+}

CsvLib/ByteArraySearcher.cs

@@ -1,5 +1,3 @@
-#nullable enable
-
 namespace CsvLib;
 
 public class ByteArraySearcher

CsvLib/CsvFieldIndexer.cs

@@ -3,322 +3,319 @@ using System.Collections.Generic;
 using System.IO;
 using System.Text;
 
-namespace CsvLib
+namespace CsvLib;
+
+public class CsvFieldIndexer
 {
-    public class CsvFieldIndexer
+    private bool _insideString;
+
+    private Encoding _currentEncoding = Encoding.Default;
+
+    private readonly char _separator;
+    private readonly char _quoteChar;
+    private readonly char _escapeChar;
+
+    public CsvFieldIndexer(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
     {
-        private bool _insideString;
+        _separator = separator;
+        _quoteChar = quoteChar;
+        _escapeChar = escapeChar;
+    }
 
-        private Encoding _currentEncoding = Encoding.Default;
+    private List<long> _index = new();
 
-        private readonly char _separator;
-        private readonly char _quoteChar;
-        private readonly char _escapeChar;
+    public List<long> Index { get { return _index; } }
 
-        public CsvFieldIndexer(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
+    private List<List<long>> _fieldIndex = new();
+
+    public List<List<long>> FieldIndex { get { return _fieldIndex; } }
+
+    private void DummyParser(string line)
+    {
+        for (int i = 0; i < line.Length; i++)
         {
-            _separator = separator;
-            _quoteChar = quoteChar;
-            _escapeChar = escapeChar;
-        }
-
-        private List<long> _index = new();
-
-        public List<long> Index { get { return _index; } }
-
-        private List<List<long>> _fieldIndex = new();
-
-        public List<List<long>> FieldIndex { get { return _fieldIndex; } }
-
-        private void DummyParser(string line)
-        {
-            for (int i = 0; i < line.Length; i++)
+            char c = line[i];
+            if (c == _separator && _insideString == false)
             {
-                char c = line[i];
-                if (c == _separator && _insideString == false)
-                {
-                    continue;
-                }
-                if (c == _quoteChar && _insideString == false)
-                {
-                    _insideString = true;
-                    continue;
-                }
-                if (c == _quoteChar && _insideString)
-                {
-                    _insideString = false;
-                    continue;
-                }
-                if (c == _escapeChar && _insideString)
-                {
-                    i++;
-                }
+                continue;
+            }
+            if (c == _quoteChar && _insideString == false)
+            {
+                _insideString = true;
+                continue;
+            }
+            if (c == _quoteChar && _insideString)
+            {
+                _insideString = false;
+                continue;
+            }
+            if (c == _escapeChar && _insideString)
+            {
+                i++;
             }
         }
+    }
 
-        private List<long> ParseLineIndex(string line, long lineOffset)
+    private List<long> ParseLineIndex(string line, long lineOffset)
+    {
+        List<long> fieldPositions = new();
+        long? fieldStartPosition = null;
+        long? fieldEndPosition = null;
+        int unicodeDelta = 0;
+        for (int i = 0; i < line.Length; i++)
         {
-            List<long> fieldPositions = new();
-            long? fieldStartPosition = null;
-            long? fieldEndPosition = null;
-            int unicodeDelta = 0;
-            for (int i = 0; i < line.Length; i++)
+            char c = line[i];
+            if (c == _separator && _insideString == false)
             {
-                char c = line[i];
-                if (c == _separator && _insideString == false)
-                {
-                    if (fieldStartPosition != null)
-                    {
-                        fieldPositions.Add((long)fieldStartPosition);
-                        fieldPositions.Add((long)fieldEndPosition);
-                    }
-                    fieldStartPosition = null;
-                    fieldEndPosition = null;
-                }
-                else if (c == _quoteChar && _insideString == false)
-                {
-                    _insideString = true;
-                }
-                else if (c == _quoteChar && _insideString)
-                {
-                    _insideString = false;
-                }
-                else if (c == _escapeChar && _insideString)
-                {
-                    i++;
-                }
-                else if ((c == '\n' || c == '\r') && _insideString == false)
-                {
-                    break;
-                }
-                else
-                {
-                    if (c > 127)
-                    {
-                        unicodeDelta += _currentEncoding.GetByteCount(c.ToString()) - 1;
-                    }
-
-                    long absolutePosition = lineOffset + i + unicodeDelta;
-                    fieldStartPosition ??= absolutePosition;
-                    fieldEndPosition = absolutePosition;
-                }
-            }
-            if (_insideString == false)
-            {
-                if (fieldStartPosition != null)
+                if (fieldStartPosition != null && fieldEndPosition != null)
                 {
                     fieldPositions.Add((long)fieldStartPosition);
                     fieldPositions.Add((long)fieldEndPosition);
                 }
+                fieldStartPosition = null;
+                fieldEndPosition = null;
             }
-            return fieldPositions;
-        }
-
-        private void GenerateIndex(string file)
-        {
-            using FileStream stream = new(file, FileMode.Open);
-            using StreamReader streamReader = new(stream, Encoding.Default, true, 4096);
-            GenerateIndex(streamReader);
-            stream.Close();
-        }
-
-        public void GenerateIndex(TextReader textReader)
-        {
-            _insideString = false;
-            _index.Clear();
-            _index.Add(0);
-            int idxRow = 0;
-            if (textReader is StreamReader streamReader)
+            else if (c == _quoteChar && _insideString == false)
             {
-                _currentEncoding = streamReader.CurrentEncoding;
+                _insideString = true;
             }
-            using BufferedTextReader reader = new(textReader);
-            string currentLine;
-            while ((currentLine = reader.ReadLine()) != null)
+            else if (c == _quoteChar && _insideString)
             {
-                DummyParser(currentLine);
-                if (_insideString) { continue; }
-
-                string fullLine = reader.GetBuffer();
-                reader.CleanBuffer();
-                List<long> fieldIndexes = ParseLineIndex(fullLine, _index[idxRow]);
-                _fieldIndex.Add(fieldIndexes);
-
-                _index.Add(reader.Position);
-
-                idxRow++;
+                _insideString = false;
             }
-        }
-
-        private const byte FileFormatVersion = 1;
-
-        private void SaveFile(string indexFile)
-        {
-            if (indexFile == null) { return; }
-            if (File.Exists(indexFile))
+            else if (c == _escapeChar && _insideString)
             {
-                File.Delete(indexFile);
+                i++;
             }
-            Stream streamOut = File.Open(indexFile, FileMode.Create);
-            using (BinaryWriter binWriter = new(streamOut))
+            else if ((c == '\n' || c == '\r') && _insideString == false)
             {
-                binWriter.Write((byte)'C');
-                binWriter.Write((byte)'S');
-                binWriter.Write((byte)'V');
-
-                binWriter.Write(FileFormatVersion);
-
-                binWriter.Write(_index.Count);
-                foreach (long currentIndex in _index)
+                break;
+            }
+            else
+            {
+                if (c > 127)
                 {
-                    binWriter.Write(currentIndex);
+                    unicodeDelta += _currentEncoding.GetByteCount(c.ToString()) - 1;
                 }
 
-                binWriter.Write(_fieldIndex.Count);
-                foreach (List<long> currentFieldIndex in _fieldIndex)
-                {
-                    binWriter.Write(currentFieldIndex.Count);
-                    for (int i = 0; i < currentFieldIndex.Count; i++)
-                    {
-                        binWriter.Write(currentFieldIndex[i]);
-                    }
-                }
-            }
-            streamOut.Close();
-        }
-
-        private bool LoadFile(string indexFile)
-        {
-            if (File.Exists(indexFile) == false)
-            {
-                return false;
-            }
-            List<long> tempIndex;
-            List<List<long>> tempFieldIndex;
-            Stream streamIn = File.Open(indexFile, FileMode.Open);
-            try
-            {
-                using BinaryReader binReader = new(streamIn);
-
-                byte magik0 = binReader.ReadByte();
-                byte magik1 = binReader.ReadByte();
-                byte magik2 = binReader.ReadByte();
-                if (magik0 != (byte)'C' || magik1 != (byte)'S' || magik2 != (byte)'V') { return false; }
-
-                byte fileVersion = binReader.ReadByte();
-                if (fileVersion != FileFormatVersion) { return false; }
-
-                int numIndexes = binReader.ReadInt32();
-                tempIndex = new List<long>(numIndexes);
-                for (int i = 0; i < numIndexes; i++)
-                {
-                    long value = binReader.ReadInt64();
-                    tempIndex.Add(value);
-                }
-
-                int numFieldIndexes = binReader.ReadInt32();
-                tempFieldIndex = new List<List<long>>(numFieldIndexes);
-                for (int j = 0; j < numFieldIndexes; j++)
-                {
-                    int numCurrentFieldIndexes = binReader.ReadInt32();
-                    List<long> currentFieldIndex = new(numCurrentFieldIndexes);
-                    for (int i = 0; i < numCurrentFieldIndexes; i++)
-                    {
-                        long value = binReader.ReadInt64();
-                        currentFieldIndex.Add(value);
-                    }
-                    tempFieldIndex.Add(currentFieldIndex);
-                }
-            }
-            catch (Exception)
-            {
-                // NON NON NOM
-                return false;
-            }
-            finally
-            {
-                streamIn.Close();
-            }
-            _index = tempIndex;
-            _fieldIndex = tempFieldIndex;
-            return true;
-        }
-
-        public void LoadIndexOfFile(string file)
-        {
-            DateTime dtFile = File.GetCreationTime(file);
-            string indexFile = $"{file}.idx";
-            if (File.Exists(indexFile) && File.GetCreationTime(indexFile) > dtFile)
-            {
-                if (LoadFile(indexFile)) { return; }
-            }
-
-            // Generate index
-            DateTime dtNow = DateTime.UtcNow;
-            GenerateIndex(file);
-            TimeSpan tsGenIndex = DateTime.UtcNow - dtNow;
-
-            // Save Index if expensive generation
-            if (tsGenIndex.TotalSeconds > 2)
-            {
-                SaveFile(indexFile);
+                long absolutePosition = lineOffset + i + unicodeDelta;
+                fieldStartPosition ??= absolutePosition;
+                fieldEndPosition = absolutePosition;
             }
         }
-
-        public List<long> Search(string fileName, string textToSearch, Action<float> notifyProgress = null)
+        if (_insideString == false)
         {
-            List<long> index;
-            using FileStream streamIn = new(fileName, FileMode.Open);
-            try
+            if (fieldStartPosition != null && fieldEndPosition != null)
             {
-                index = Search(streamIn, textToSearch, notifyProgress);
+                fieldPositions.Add((long)fieldStartPosition);
+                fieldPositions.Add((long)fieldEndPosition);
             }
-            finally
-            {
-                streamIn.Close();
-            }
-            return index ?? new List<long>();
         }
-        
-        public List<long> Search(Stream streamIn, string textToSearch, Action<float> notifyProgress = null)
+        return fieldPositions;
+    }
+
+    private void GenerateIndex(string file)
+    {
+        using FileStream stream = new(file, FileMode.Open);
+        using StreamReader streamReader = new(stream, Encoding.Default, true, 4096);
+        GenerateIndex(streamReader);
+        stream.Close();
+    }
+
+    public void GenerateIndex(TextReader textReader)
+    {
+        _insideString = false;
+        _index.Clear();
+        _index.Add(0);
+        int idxRow = 0;
+        if (textReader is StreamReader streamReader)
         {
-            // TODO: Use MemoryMappedFile for better IO performance
-            DateTime datePrevious = DateTime.UtcNow;
-            List<long> newIndexes = new();
-            byte[] bText = Encoding.UTF8.GetBytes(textToSearch);
-            ByteArraySearcher searcher = new(bText);
-            byte[] buffer = new byte[1024];
-            for (int j = 0; j < _fieldIndex.Count; j++)
-            {
-                for (int i = 0; i < _fieldIndex[j].Count; i += 2)
-                {
-                    TimeSpan tsElapsed = DateTime.UtcNow - datePrevious;
-                    if (tsElapsed.TotalMilliseconds > 200)
-                    {
-                        datePrevious = DateTime.UtcNow;
-                        notifyProgress?.Invoke(j/(float)_fieldIndex.Count);
-                    }
-                    
-                    long offset = _fieldIndex[j][i];
-                    int length = (int)(_fieldIndex[j][i + 1] - offset) + 1;
-                    
-                    if (buffer.Length < length)
-                    {
-                        buffer = new byte[length];
-                    }
-                    streamIn.Seek(offset, SeekOrigin.Begin);
-                    int read = streamIn.Read(buffer, 0, length);
-                    if (read != length) { throw new Exception($"Search: Expected {length} bytes, but read {read}"); }
+            _currentEncoding = streamReader.CurrentEncoding;
+        }
+        using BufferedTextReader reader = new(textReader);
+        while (reader.ReadLine() is { } currentLine)
+        {
+            DummyParser(currentLine);
+            if (_insideString) { continue; }
 
-                    bool matches = searcher.Contains(buffer, length);
-                    if (matches == false) { continue; }
-                    
-                    newIndexes.Add(_index[j]);
-                    break;
-                }
-            }
+            string fullLine = reader.GetBuffer();
+            reader.CleanBuffer();
+            List<long> fieldIndexes = ParseLineIndex(fullLine, _index[idxRow]);
+            _fieldIndex.Add(fieldIndexes);
 
-            return newIndexes;
+            _index.Add(reader.Position);
+
+            idxRow++;
         }
     }
-}
+
+    private const byte FileFormatVersion = 1;
+
+    private void SaveFile(string indexFile)
+    {
+        if (File.Exists(indexFile))
+        {
+            File.Delete(indexFile);
+        }
+        Stream streamOut = File.Open(indexFile, FileMode.Create);
+        using (BinaryWriter binWriter = new(streamOut))
+        {
+            binWriter.Write((byte)'C');
+            binWriter.Write((byte)'S');
+            binWriter.Write((byte)'V');
+
+            binWriter.Write(FileFormatVersion);
+
+            binWriter.Write(_index.Count);
+            foreach (long currentIndex in _index)
+            {
+                binWriter.Write(currentIndex);
+            }
+
+            binWriter.Write(_fieldIndex.Count);
+            foreach (List<long> currentFieldIndex in _fieldIndex)
+            {
+                binWriter.Write(currentFieldIndex.Count);
+                foreach (long fieldIndex in currentFieldIndex)
+                {
+                    binWriter.Write(fieldIndex);
+                }
+            }
+        }
+        streamOut.Close();
+    }
+
+    private bool LoadFile(string indexFile)
+    {
+        if (File.Exists(indexFile) == false)
+        {
+            return false;
+        }
+        List<long> tempIndex;
+        List<List<long>> tempFieldIndex;
+        Stream streamIn = File.Open(indexFile, FileMode.Open);
+        try
+        {
+            using BinaryReader binReader = new(streamIn);
+
+            byte magik0 = binReader.ReadByte();
+            byte magik1 = binReader.ReadByte();
+            byte magik2 = binReader.ReadByte();
+            if (magik0 != (byte)'C' || magik1 != (byte)'S' || magik2 != (byte)'V') { return false; }
+
+            byte fileVersion = binReader.ReadByte();
+            if (fileVersion != FileFormatVersion) { return false; }
+
+            int numIndexes = binReader.ReadInt32();
+            tempIndex = new List<long>(numIndexes);
+            for (int i = 0; i < numIndexes; i++)
+            {
+                long value = binReader.ReadInt64();
+                tempIndex.Add(value);
+            }
+
+            int numFieldIndexes = binReader.ReadInt32();
+            tempFieldIndex = new List<List<long>>(numFieldIndexes);
+            for (int j = 0; j < numFieldIndexes; j++)
+            {
+                int numCurrentFieldIndexes = binReader.ReadInt32();
+                List<long> currentFieldIndex = new(numCurrentFieldIndexes);
+                for (int i = 0; i < numCurrentFieldIndexes; i++)
+                {
+                    long value = binReader.ReadInt64();
+                    currentFieldIndex.Add(value);
+                }
+                tempFieldIndex.Add(currentFieldIndex);
+            }
+        }
+        catch (Exception)
+        {
+            // NON NON NOM
+            return false;
+        }
+        finally
+        {
+            streamIn.Close();
+        }
+        _index = tempIndex;
+        _fieldIndex = tempFieldIndex;
+        return true;
+    }
+
+    public void LoadIndexOfFile(string file)
+    {
+        DateTime dtFile = File.GetCreationTime(file);
+        string indexFile = $"{file}.idx";
+        if (File.Exists(indexFile) && File.GetCreationTime(indexFile) > dtFile)
+        {
+            if (LoadFile(indexFile)) { return; }
+        }
+
+        // Generate index
+        DateTime dtNow = DateTime.UtcNow;
+        GenerateIndex(file);
+        TimeSpan tsGenIndex = DateTime.UtcNow - dtNow;
+
+        // Save Index if expensive generation
+        if (tsGenIndex.TotalSeconds > 2)
+        {
+            SaveFile(indexFile);
+        }
+    }
+
+    public List<long> Search(string fileName, string textToSearch, Action<float>? notifyProgress = null)
+    {
+        List<long> index;
+        using FileStream streamIn = new(fileName, FileMode.Open);
+        try
+        {
+            index = Search(streamIn, textToSearch, notifyProgress);
+        }
+        finally
+        {
+            streamIn.Close();
+        }
+        return index;
+    }
+        
+    public List<long> Search(Stream streamIn, string textToSearch, Action<float>? notifyProgress = null)
+    {
+        // TODO: Use MemoryMappedFile for better IO performance
+        DateTime datePrevious = DateTime.UtcNow;
+        List<long> newIndexes = new();
+        byte[] bText = Encoding.UTF8.GetBytes(textToSearch);
+        ByteArraySearcher searcher = new(bText);
+        byte[] buffer = new byte[1024];
+        for (int j = 0; j < _fieldIndex.Count; j++)
+        {
+            for (int i = 0; i < _fieldIndex[j].Count; i += 2)
+            {
+                TimeSpan tsElapsed = DateTime.UtcNow - datePrevious;
+                if (tsElapsed.TotalMilliseconds > 200)
+                {
+                    datePrevious = DateTime.UtcNow;
+                    notifyProgress?.Invoke(j/(float)_fieldIndex.Count);
+                }
+                    
+                long offset = _fieldIndex[j][i];
+                int length = (int)(_fieldIndex[j][i + 1] - offset) + 1;
+                    
+                if (buffer.Length < length)
+                {
+                    buffer = new byte[length];
+                }
+                streamIn.Seek(offset, SeekOrigin.Begin);
+                int read = streamIn.Read(buffer, 0, length);
+                if (read != length) { throw new Exception($"Search: Expected {length} bytes, but read {read}"); }
+
+                bool matches = searcher.Contains(buffer, length);
+                if (matches == false) { continue; }
+                    
+                newIndexes.Add(_index[j]);
+                break;
+            }
+        }
+
+        return newIndexes;
+    }
+}

CsvLib/CsvLib.csproj

@@ -1,8 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net7.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <LangVersion>11</LangVersion>
+        <Nullable>enable</Nullable>
     </PropertyGroup>
 
 </Project>

CsvLib/CsvParser.cs

@@ -2,102 +2,100 @@
 using System.IO;
 using System.Text;
 
-namespace CsvLib
+namespace CsvLib;
+
+public class CsvParser
 {
-    public class CsvParser
+    private bool _insideString;
+
+    private readonly char _separator;
+    private readonly char _quoteChar;
+    private readonly char _escapeChar;
+
+    public CsvParser(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
     {
-        private bool _insideString;
+        _separator = separator;
+        _quoteChar = quoteChar;
+        _escapeChar = escapeChar;
+    }
 
-        private readonly char _separator;
-        private readonly char _quoteChar;
-        private readonly char _escapeChar;
+    private List<List<string>> _data = new();
 
-        public CsvParser(char separator = ',', char quoteChar = '"', char escapeChar = '\\')
+    private List<string>? _currentReg;
+    private StringBuilder? _currentCell;
+
+    public List<List<string>> Data
+    {
+        get { return _data; }
+    }
+
+    private void ParseLine(string line)
+    {
+        _currentReg ??= new List<string>();
+        _currentCell ??= new StringBuilder();
+
+        for (int i = 0; i < line.Length; i++)
         {
-            _separator = separator;
-            _quoteChar = quoteChar;
-            _escapeChar = escapeChar;
-        }
-
-        private List<List<string>> _data = new();
-
-        private List<string> _currentReg;
-        StringBuilder _currentCell;
-
-        public List<List<string>> Data
-        {
-            get { return _data; }
-        }
-
-        private void ParseLine(string line)
-        {
-            _currentReg ??= new List<string>();
-            _currentCell ??= new StringBuilder();
-
-            for (int i = 0; i < line.Length; i++)
-            {
-                char c = line[i];
-                if (c == _separator && _insideString == false)
-                {
-                    _currentReg.Add(_currentCell.ToString());
-                    _currentCell.Clear();
-                    continue;
-                }
-                if (c == _quoteChar && _insideString == false)
-                {
-                    _insideString = true;
-                    continue;
-                }
-                if (c == _quoteChar && _insideString)
-                {
-                    _insideString = false;
-                    continue;
-                }
-                if (c == _escapeChar && _insideString)
-                {
-                    i++;
-                    if (i == line.Length) { break; }
-                    c = line[i];
-                }
-
-                _currentCell.Append(c);
-            }
-
-
-            if (_insideString)
-            {
-                _currentCell.Append('\n');
-            }
-            else
+            char c = line[i];
+            if (c == _separator && _insideString == false)
             {
                 _currentReg.Add(_currentCell.ToString());
                 _currentCell.Clear();
-                _data.Add(_currentReg);
-                _currentReg = null;
+                continue;
             }
+            if (c == _quoteChar && _insideString == false)
+            {
+                _insideString = true;
+                continue;
+            }
+            if (c == _quoteChar && _insideString)
+            {
+                _insideString = false;
+                continue;
+            }
+            if (c == _escapeChar && _insideString)
+            {
+                i++;
+                if (i == line.Length) { break; }
+                c = line[i];
+            }
+
+            _currentCell.Append(c);
         }
 
-        public void ParseFile(string file, long offset = 0, int count = 0)
+
+        if (_insideString)
         {
-            _insideString = false;
-            _data = new List<List<string>>();
+            _currentCell.Append('\n');
+        }
+        else
+        {
+            _currentReg.Add(_currentCell.ToString());
+            _currentCell.Clear();
+            _data.Add(_currentReg);
             _currentReg = null;
-            FileStream stream = new(file, FileMode.Open);
-            stream.Seek(offset, SeekOrigin.Begin);
-            using (StreamReader reader = new(stream, Encoding.Default, true, 4096))
+        }
+    }
+
+    public void ParseFile(string file, long offset = 0, int count = 0)
+    {
+        _insideString = false;
+        _data = new List<List<string>>();
+        _currentReg = null;
+        FileStream stream = new(file, FileMode.Open);
+        stream.Seek(offset, SeekOrigin.Begin);
+        using (StreamReader reader = new(stream, Encoding.Default, true, 4096))
+        {
+            while (reader.ReadLine() is { } currentLine)
             {
-                string currentLine;
-                while ((currentLine = reader.ReadLine()) != null)
+                ParseLine(currentLine);
+                if (count > 0 && Data.Count == count)
                 {
-                    ParseLine(currentLine);
-                    if (count > 0 && Data.Count == count)
-                    {
-                        break;
-                    }
+                    break;
                 }
             }
-            stream.Close();
         }
-
+        stream.Close();
     }
-}
+
+}

CsvView.sln.DotSettings

@@ -1,3 +1,4 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 	<s:String x:Key="/Default/Environment/Hierarchy/Build/BuildTool/CustomBuildToolPath/@EntryValue">/usr/share/dotnet/sdk/7.0.107/MSBuild.dll</s:String>
-	<s:Int64 x:Key="/Default/Environment/Hierarchy/Build/BuildTool/MsbuildVersion/@EntryValue">4294967293</s:Int64></wpf:ResourceDictionary>
+	<s:Int64 x:Key="/Default/Environment/Hierarchy/Build/BuildTool/MsbuildVersion/@EntryValue">4294967293</s:Int64>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Avalonia/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

CsvView/App.axaml

@@ -1,7 +1,7 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              x:Class="CsvView.App"
-             RequestedThemeVariant="Default">
+             RequestedThemeVariant="Dark">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
     <Application.Styles>

CsvView/CsvView.csproj

@@ -1,14 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>WinExe</OutputType>
-        <TargetFramework>net7.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <Nullable>enable</Nullable>
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <ApplicationManifest>app.manifest</ApplicationManifest>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     </PropertyGroup>
-
-
+    
     <ItemGroup>
         <PackageReference Include="Avalonia" Version="11.0.2"/>
         <PackageReference Include="Avalonia.Desktop" Version="11.0.2"/>
@@ -17,8 +16,7 @@
         <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
         <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.2"/>
     </ItemGroup>
-
-
+    
     <ItemGroup>
       <ProjectReference Include="..\CsvLib\CsvLib.csproj" />
     </ItemGroup>

CsvView/MainWindow.axaml

@@ -9,12 +9,12 @@
         Width="800"
         Height="600"
         Title="CsvView">
-    <Grid RowDefinitions="Auto,Auto,Auto,*">
-        <Grid ColumnDefinitions="Auto,*" Grid.Row="0">
+    <Grid RowDefinitions="Auto,Auto,Auto,*" Margin="5">
+        <Grid ColumnDefinitions="Auto,*" Grid.Row="0" Margin="0 0 0 5">
             <Button Grid.Column="0" Name="BtnLoad" Click="BtnLoad_OnClick">...</Button>
             <TextBox Grid.Column="1" Name="TxtFileName" IsReadOnly="true" />
         </Grid>
-        <Grid ColumnDefinitions="*,Auto" Grid.Row="1">
+        <Grid ColumnDefinitions="*,Auto" Grid.Row="1" Margin="0 0 0 5">
             <TextBox Grid.Column="0" Name="TxtSearch" />
             <Button Grid.Column="1" Name="BtnSearch" Click="BtnSearch_OnClick">🔍</Button>
         </Grid>
@@ -22,7 +22,7 @@
             <Button Name="BtnFirst" Click="BtnFirst_OnClick">|◁</Button>
             <Button Name="BtnPrevious" Click="BtnPrevious_OnClick">◁</Button>
             <TextBox Name="TxtIndex" Text="{Binding Index}" TextChanged="TxtIndex_OnTextChanged"></TextBox>
-            <TextBlock>/</TextBlock>
+            <TextBlock VerticalAlignment="Center">/</TextBlock>
             <TextBox Name="TxtMaxIndex" Text="{Binding MaxIndex}" IsReadOnly="true"></TextBox>
             <Button Name="BtnNext" Click="BtnNext_OnClick">▷</Button>
             <Button Name="BtnLast" Click="BtnLast_OnClick">▷|</Button>

CsvView/MainWindow.axaml.cs

@@ -28,8 +28,8 @@ public partial class MainWindow : Window
             AllowMultiple = false,
             FileTypeFilter = new List<FilePickerFileType>
             {
-                new("CSV Files") { Patterns = new[] { "*.csv" } },
-                new("Any File") { Patterns = new[] { "*" } },
+                new("CSV Files") { Patterns = new[] { "*.csv", }, },
+                new("Any File") { Patterns = new[] { "*", }, },
             },
         });
 
@@ -89,6 +89,8 @@ public partial class MainWindow : Window
 
     private void Search(string? textToSearch)
     {
+        if (textToSearch == null) { return; }
+        
         // TODO: Loading animation
         CsvFieldIndexer csvIndexer = new();
         csvIndexer.LoadIndexOfFile(_loadedFile);

CsvView/Program.cs

@@ -3,7 +3,7 @@ using System;
 
 namespace CsvView;
 
-class Program
+static class Program
 {
     // Initialization code. Don't use any Avalonia, third-party APIs or any
     // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
@@ -13,7 +13,7 @@ class Program
         .StartWithClassicDesktopLifetime(args);
 
     // Avalonia configuration, don't remove; also used by visual designer.
-    public static AppBuilder BuildAvaloniaApp()
+    private static AppBuilder BuildAvaloniaApp()
         => AppBuilder.Configure<App>()
             .UsePlatformDetect()
             .WithInterFont()