Fix IDisposable usage

src/SixLabors.Fonts/Buffer{T}.cs

@@ -26,7 +26,7 @@ public Buffer(int length)
         this.buffer = ArrayPool<byte>.Shared.Rent(bufferSizeInBytes);
         this.length = length;
 
-        ByteMemoryManager<T> manager = new(this.buffer);
+        using ByteMemoryManager<T> manager = new(this.buffer);
         this.Memory = manager.Memory.Slice(0, this.length);
         this.span = this.Memory.Span;
 

src/SixLabors.Fonts/FileFontMetrics.cs

@@ -164,7 +164,7 @@ public static FileFontMetrics[] LoadFontCollection(string path)
     {
         using FileStream fs = File.OpenRead(path);
         long startPos = fs.Position;
-        BigEndianBinaryReader reader = new(fs, true);
+        using BigEndianBinaryReader reader = new(fs, true);
         TtcHeader ttcHeader = TtcHeader.Read(reader);
         FileFontMetrics[] fonts = new FileFontMetrics[(int)ttcHeader.NumFonts];
 

src/SixLabors.Fonts/FontCollection.cs

@@ -234,7 +234,7 @@ private IEnumerable<FontFamily> AddCollectionImpl(
         out IEnumerable<FontDescription> descriptions)
     {
         long startPos = stream.Position;
-        BigEndianBinaryReader reader = new(stream, true);
+        using BigEndianBinaryReader reader = new(stream, true);
         TtcHeader ttcHeader = TtcHeader.Read(reader);
         List<FontDescription> result = new((int)ttcHeader.NumFonts);
         HashSet<FontFamily> installedFamilies = new();

src/SixLabors.Fonts/FontDescription.cs

@@ -92,7 +92,7 @@ public static FontDescription LoadDescription(string path)
         Guard.NotNullOrWhiteSpace(path, nameof(path));
 
         using FileStream fs = File.OpenRead(path);
-        var reader = new FontReader(fs);
+        using var reader = new FontReader(fs);
         return LoadDescription(reader);
     }
 
@@ -106,7 +106,7 @@ public static FontDescription LoadDescription(Stream stream)
         Guard.NotNull(stream, nameof(stream));
 
         // Only read the name tables.
-        var reader = new FontReader(stream);
+        using var reader = new FontReader(stream);
 
         return LoadDescription(reader);
     }
@@ -152,14 +152,14 @@ public static FontDescription[] LoadFontCollectionDescriptions(string path)
     public static FontDescription[] LoadFontCollectionDescriptions(Stream stream)
     {
         long startPos = stream.Position;
-        var reader = new BigEndianBinaryReader(stream, true);
+        using var reader = new BigEndianBinaryReader(stream, true);
         var ttcHeader = TtcHeader.Read(reader);
 
         var result = new FontDescription[(int)ttcHeader.NumFonts];
         for (int i = 0; i < ttcHeader.NumFonts; ++i)
         {
             stream.Position = startPos + ttcHeader.OffsetTable[i];
-            var fontReader = new FontReader(stream);
+            using var fontReader = new FontReader(stream);
             result[i] = LoadDescription(fontReader);
         }
 

src/SixLabors.Fonts/FontReader.cs

@@ -9,21 +9,23 @@
 
 namespace SixLabors.Fonts;
 
-internal sealed class FontReader
+internal sealed class FontReader : IDisposable
 {
     private readonly Stream stream;
     private readonly Dictionary<Type, Table> loadedTables = new();
     private readonly TableLoader loader;
 
+    private readonly bool isOwnedStream;
+    private bool isDisposed;
+
     internal FontReader(Stream stream, TableLoader loader)
     {
         this.loader = loader;
 
         Func<BigEndianBinaryReader, TableHeader> loadHeader = TableHeader.Read;
-        long startOfFilePosition = stream.Position;
 
         this.stream = stream;
-        var reader = new BigEndianBinaryReader(stream, true);
+        using var reader = new BigEndianBinaryReader(stream, true);
 
         // we should immediately read the table header to learn which tables we have and what order they are in
         uint version = reader.ReadUInt32();
@@ -85,13 +87,14 @@ internal FontReader(Stream stream, TableLoader loader)
             this.CompressedTableData = true;
             this.Headers = Woff2Utils.ReadWoff2Headers(reader, tableCount);
 
+            this.isOwnedStream = true;
+
             byte[] compressedBuffer = reader.ReadBytes((int)totalCompressedSize);
             var decompressedStream = new MemoryStream();
             using var input = new MemoryStream(compressedBuffer);
             using var decompressor = new BrotliStream(input, CompressionMode.Decompress);
             decompressor.CopyTo(decompressedStream);
             decompressedStream.Position = 0;
-            this.stream.Dispose();
             this.stream = decompressedStream;
             return;
         }
@@ -197,4 +200,18 @@ public bool TryGetReaderAtTablePosition(string tableName, [NotNullWhen(returnVal
         reader = header?.CreateReader(this.stream);
         return reader != null;
     }
+
+    public void Dispose()
+    {
+        if (this.isDisposed)
+        {
+            return;
+        }
+
+        if (this.isOwnedStream)
+        {
+            this.stream.Dispose();
+            this.isDisposed = true;
+        }
+    }
 }

src/SixLabors.Fonts/Native/MacSystemFontsEnumerator.cs

@@ -18,7 +18,7 @@ namespace SixLabors.Fonts.Native;
 /// Internally, it calls the native CoreText's <see cref="CTFontManagerCopyAvailableFontURLs"/> method to retrieve
 /// the list of fonts so using this class must be guarded by <c>RuntimeInformation.IsOSPlatform(OSPlatform.OSX)</c>.
 /// </remarks>
-internal class MacSystemFontsEnumerator : IEnumerable<string>, IEnumerator<string>
+internal sealed class MacSystemFontsEnumerator : IEnumerable<string>, IEnumerator<string>
 {
     private static readonly ArrayPool<byte> BytePool = ArrayPool<byte>.Shared;
 

src/SixLabors.Fonts/StreamFontMetrics.cs

@@ -333,7 +333,7 @@ internal override void UpdatePositions(GlyphPositioningCollection collection)
     public static StreamFontMetrics LoadFont(string path)
     {
         using FileStream fs = File.OpenRead(path);
-        var reader = new FontReader(fs);
+        using var reader = new FontReader(fs);
         return LoadFont(reader);
     }
 
@@ -357,7 +357,7 @@ public static StreamFontMetrics LoadFont(string path, long offset)
     /// <returns>a <see cref="StreamFontMetrics"/>.</returns>
     public static StreamFontMetrics LoadFont(Stream stream)
     {
-        var reader = new FontReader(stream);
+        using var reader = new FontReader(stream);
         return LoadFont(reader);
     }
 

tests/SixLabors.Fonts.Tests/FontReaderTests.cs

@@ -15,7 +15,7 @@ public void ReadTrueTypeOutlineType()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader(0, 0, 0, 0);
 
-        var reader = new FontReader(writer.GetStream());
+        using var reader = new FontReader(writer.GetStream());
         Assert.Equal(OutlineType.TrueType, reader.OutlineType);
     }
 
@@ -25,7 +25,7 @@ public void ReadCffOutlineType()
         var writer = new BigEndianBinaryWriter();
         writer.WriteCffFileHeader(0, 0, 0, 0);
 
-        var reader = new FontReader(writer.GetStream());
+        using var reader = new FontReader(writer.GetStream());
         Assert.Equal(OutlineType.CFF, reader.OutlineType);
     }
 
@@ -37,7 +37,7 @@ public void ReadTableHeaders()
         writer.WriteTableHeader("name", 0, 10, 0);
         writer.WriteTableHeader("cmap", 0, 1, 0);
 
-        var reader = new FontReader(writer.GetStream());
+        using var reader = new FontReader(writer.GetStream());
 
         Assert.Equal(2, reader.Headers.Count);
     }
@@ -59,16 +59,16 @@ public void ReadCMapTable()
                     new byte[] { 2, 9 })
             });
 
-        var reader = new FontReader(writer.GetStream());
+        using var reader = new FontReader(writer.GetStream());
         CMapTable cmap = reader.GetTable<CMapTable>();
         Assert.NotNull(cmap);
     }
 
     [Fact]
     public void ReadFont_WithWoffFormat_EqualsTtf()
     {
-        var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
-        var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff1Data());
+        using var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
+        using var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff1Data());
 
         Assert.Equal(fontReaderTtf.Headers.Count, fontReaderWoff.Headers.Count);
         foreach (string key in fontReaderTtf.Headers.Keys)
@@ -80,9 +80,9 @@ public void ReadFont_WithWoffFormat_EqualsTtf()
     [Fact]
     public void GlyphsCount_WithWoffFormat_EqualsTtf()
     {
-        var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff1Data());
+        using var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff1Data());
         GlyphTable glyphsWoff = fontReaderWoff.GetTable<GlyphTable>();
-        var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
+        using var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
         GlyphTable glyphsTtf = fontReaderTtf.GetTable<GlyphTable>();
 
         Assert.Equal(glyphsTtf.GlyphCount, glyphsWoff.GlyphCount);
@@ -91,8 +91,8 @@ public void GlyphsCount_WithWoffFormat_EqualsTtf()
     [Fact]
     public void ReadFont_WithWoff2Format_EqualsTtf()
     {
-        var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
-        var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff2Data());
+        using var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
+        using var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff2Data());
 
         Assert.Equal(fontReaderTtf.Headers.Count, fontReaderWoff.Headers.Count);
         foreach (string key in fontReaderTtf.Headers.Keys)
@@ -104,9 +104,9 @@ public void ReadFont_WithWoff2Format_EqualsTtf()
     [Fact]
     public void GlyphsCount_WithWoff2Format_EqualsTtf()
     {
-        var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff2Data());
+        using var fontReaderWoff = new FontReader(TestFonts.OpensSansWoff2Data());
         GlyphTable glyphsWoff = fontReaderWoff.GetTable<GlyphTable>();
-        var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
+        using var fontReaderTtf = new FontReader(TestFonts.OpenSansTtfData());
         GlyphTable glyphsTtf = fontReaderTtf.GetTable<GlyphTable>();
 
         Assert.Equal(glyphsTtf.GlyphCount, glyphsWoff.GlyphCount);

tests/SixLabors.Fonts.Tests/Tables/General/CMapTableTests.cs

@@ -35,7 +35,11 @@ public void ShouldThrowExceptionWhenTableCouldNotBeFound()
 
         using (System.IO.MemoryStream stream = writer.GetStream())
         {
-            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(() => CMapTable.Load(new FontReader(stream)));
+            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(() =>
+            {
+                using var reader = new FontReader(stream);
+                CMapTable.Load(reader);
+            });
 
             Assert.Equal("cmap", exception.Table);
         }

tests/SixLabors.Fonts.Tests/Tables/General/ColrTableTests.cs

@@ -14,9 +14,10 @@ public void ShouldReturnNullWhenTableCouldNotBeFound()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader();
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            Assert.Null(ColrTable.Load(new FontReader(stream)));
+            using var reader = new FontReader(stream);
+            Assert.Null(ColrTable.Load(reader));
         }
     }
 
@@ -47,12 +48,12 @@ public void ShouldReturnTableValues()
             }
         });
 
-        using (System.IO.Stream stream = TestFonts.TwemojiMozillaData())
+        using (Stream stream = TestFonts.TwemojiMozillaData())
         {
-            var reader = new FontReader(stream);
+            using var reader = new FontReader(stream);
             ColrTable tbl = reader.GetTable<ColrTable>();
 
-            System.Span<LayerRecord> layers = tbl.GetLayers(15);
+            Span<LayerRecord> layers = tbl.GetLayers(15);
             Assert.Equal(2, layers.Length);
         }
     }

tests/SixLabors.Fonts.Tests/Tables/General/HorizontalHeadTableTests.cs

@@ -35,9 +35,10 @@ public void ShouldReturnNullWhenTableCouldNotBeFound()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader();
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            Assert.Null(HorizontalHeadTable.Load(new FontReader(stream)));
+            using var reader = new FontReader(stream);
+            Assert.Null(HorizontalHeadTable.Load(reader));
         }
     }
 }

tests/SixLabors.Fonts.Tests/Tables/General/IndexLocationTableTests.cs

@@ -15,10 +15,13 @@ public void ShouldThrowExceptionWhenHeadTableCouldNotBeFound()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader();
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            MissingFontTableException exception = Assert.Throws<MissingFontTableException>(
-                    () => IndexLocationTable.Load(new FontReader(stream)));
+            MissingFontTableException exception = Assert.Throws<MissingFontTableException>(() =>
+            {
+                using var reader = new FontReader(stream);
+                IndexLocationTable.Load(reader);
+            });
 
             Assert.Equal("head", exception.Table);
         }
@@ -40,10 +43,13 @@ public void ShouldThrowExceptionWhenMaximumProfileTableCouldNotBeFound()
             0,
             HeadTable.IndexLocationFormats.Offset16));
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(
-                () => IndexLocationTable.Load(new FontReader(stream)));
+            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(() =>
+            {
+                using var reader = new FontReader(stream);
+                IndexLocationTable.Load(reader);
+            });
 
             Assert.Equal("maxp", exception.Table);
         }
@@ -65,9 +71,10 @@ public void ShouldReturnNullWhenTableCouldNotBeFound()
             0,
             HeadTable.IndexLocationFormats.Offset16));
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            Assert.Null(IndexLocationTable.Load(new FontReader(stream)));
+            using var reader = new FontReader(stream);
+            Assert.Null(IndexLocationTable.Load(reader));
         }
     }
 }

tests/SixLabors.Fonts.Tests/Tables/General/KerningTableTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using SixLabors.Fonts.Tables.General.Kern;
@@ -13,9 +13,10 @@ public void ShouldReturnDefaultValueWhenTableCouldNotBeFound()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader();
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            var table = KerningTable.Load(new FontReader(stream));
+            using var reader = new FontReader(stream);
+            var table = KerningTable.Load(reader);
             Assert.NotNull(table);
         }
     }

tests/SixLabors.Fonts.Tests/Tables/General/MaximumProfileTableTests.cs

@@ -15,8 +15,11 @@ public void ShouldThrowExceptionWhenTableCouldNotBeFound()
 
         using (MemoryStream stream = writer.GetStream())
         {
-            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(
-                () => MaximumProfileTable.Load(new FontReader(stream)));
+            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(() =>
+            {
+                using var reader = new FontReader(stream);
+                MaximumProfileTable.Load(reader);
+            });
 
             Assert.Equal("maxp", exception.Table);
         }

tests/SixLabors.Fonts.Tests/Tables/General/NameTableTests.cs

@@ -76,10 +76,13 @@ public void ShouldThrowExceptionWhenTableCouldNotBeFound()
         var writer = new BigEndianBinaryWriter();
         writer.WriteTrueTypeFileHeader();
 
-        using (System.IO.MemoryStream stream = writer.GetStream())
+        using (MemoryStream stream = writer.GetStream())
         {
-            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(
-                () => NameTable.Load(new FontReader(stream)));
+            InvalidFontTableException exception = Assert.Throws<InvalidFontTableException>(() =>
+            {
+                using var reader = new FontReader(stream);
+                NameTable.Load(reader);
+            });
 
             Assert.Equal("name", exception.Table);
         }