add very basic handler for simple truetype fonts

src/UglyToad.Pdf.Tests/Integration/FontSizeTestFromLibreOfficeTests.cs

@@ -30,9 +30,9 @@
         {
             using (var document = PdfDocument.Open(GetFilename()))
             {
-                //var page = document.GetPage(1);
+                var page = document.GetPage(1);
 
-                //Assert.Equal(PageSize.A4, page.Size);
+                Assert.Equal(PageSize.A4, page.Size);
             }
         }
     }

src/UglyToad.Pdf/Content/PageSize.cs

@@ -36,7 +36,9 @@
             // Seems there is some disagreement 1190/1191
             {new WidthHeight(842, 1190), PageSize.A3},
             {new WidthHeight(842, 1191), PageSize.A3},
+            // Possibly some kind of rounding mix-up here
             {new WidthHeight(595, 842), PageSize.A4},
+            {new WidthHeight(595, 841), PageSize.A4},
             {new WidthHeight(420, 595), PageSize.A5},
             {new WidthHeight(298, 420), PageSize.A6},
             {new WidthHeight(210, 298), PageSize.A7},

src/UglyToad.Pdf/Fonts/FontFactory.cs

@@ -14,12 +14,13 @@
         private readonly ILog log;
         private readonly IReadOnlyDictionary<CosName, IFontHandler> handlers;
 
-        public FontFactory(ILog log, Type0FontHandler type0FontHandler)
+        public FontFactory(ILog log, Type0FontHandler type0FontHandler, TrueTypeFontHandler trueTypeFontHandler)
         {
             this.log = log;
             handlers = new Dictionary<CosName, IFontHandler>
             {
-                {CosName.TYPE0, type0FontHandler}
+                {CosName.TYPE0, type0FontHandler},
+                {CosName.TRUE_TYPE,  trueTypeFontHandler}
             };
         }
 

src/UglyToad.Pdf/Fonts/Parser/Handlers/TrueTypeFontHandler.cs

@@ -1,6 +1,160 @@
 namespace UglyToad.Pdf.Fonts.Parser.Handlers
 {
-    internal class TrueTypeFontHandler
+    using System.Linq;
+    using Cmap;
+    using ContentStream;
+    using Cos;
+    using Exceptions;
+    using Filters;
+    using IO;
+    using Parts;
+    using Pdf.Parser;
+    using Simple;
+    using TrueType;
+    using TrueType.Parser;
+
+    internal class TrueTypeFontHandler : IFontHandler
     {
+        private readonly IPdfObjectParser pdfObjectParser;
+        private readonly IFilterProvider filterProvider;
+        private readonly CMapCache cMapCache;
+        private readonly FontDescriptorFactory fontDescriptorFactory;
+        private readonly TrueTypeFontParser trueTypeFontParser;
+
+        public TrueTypeFontHandler(IPdfObjectParser pdfObjectParser, IFilterProvider filterProvider, 
+            CMapCache cMapCache,
+            FontDescriptorFactory fontDescriptorFactory,
+            TrueTypeFontParser trueTypeFontParser)
+        {
+            this.pdfObjectParser = pdfObjectParser;
+            this.filterProvider = filterProvider;
+            this.cMapCache = cMapCache;
+            this.fontDescriptorFactory = fontDescriptorFactory;
+            this.trueTypeFontParser = trueTypeFontParser;
+        }
+
+        public IFont Generate(PdfDictionary dictionary, IRandomAccessRead reader, bool isLenientParsing)
+        {
+            var firstCharacter = GetFirstCharacter(dictionary);
+
+            var lastCharacter = GetLastCharacter(dictionary);
+
+            var widths = GetWidths(dictionary);
+
+            var descriptor = GetFontDescriptor(dictionary, reader, isLenientParsing);
+
+            var font = ParseTrueTypeFont(descriptor, reader, isLenientParsing);
+
+            var name = GetName(dictionary, descriptor);
+
+            CMap toUnicodeCMap = null;
+            if (dictionary.TryGetItemOfType(CosName.TO_UNICODE, out CosObject toUnicodeObj))
+            {
+                var toUnicode = pdfObjectParser.Parse(toUnicodeObj.ToIndirectReference(), reader, isLenientParsing) as PdfRawStream;
+
+                var decodedUnicodeCMap = toUnicode?.Decode(filterProvider);
+
+                if (decodedUnicodeCMap != null)
+                {
+                    toUnicodeCMap = cMapCache.Parse(new ByteArrayInputBytes(decodedUnicodeCMap), isLenientParsing);
+                }
+            }
+
+            return new TrueTypeSimpleFont(name, firstCharacter, lastCharacter, widths, descriptor, toUnicodeCMap);
+        }
+
+        private static int GetFirstCharacter(PdfDictionary dictionary)
+        {
+            if (!dictionary.TryGetItemOfType(CosName.FIRST_CHAR, out CosInt firstChar))
+            {
+                throw new InvalidFontFormatException(
+                    $"No first character entry was found in the font dictionary for this TrueType font: {dictionary}.");
+            }
+
+            return firstChar.AsInt();
+        }
+
+        private static int GetLastCharacter(PdfDictionary dictionary)
+        {
+            if (!dictionary.TryGetItemOfType(CosName.LAST_CHAR, out CosInt lastChar))
+            {
+                throw new InvalidFontFormatException(
+                    $"No last character entry was found in the font dictionary for this TrueType font: {dictionary}.");
+            }
+
+            return lastChar.AsInt();
+        }
+
+        private static decimal[] GetWidths(PdfDictionary dictionary)
+        {
+            if (!dictionary.TryGetItemOfType(CosName.WIDTHS, out COSArray widthArray))
+            {
+                throw new InvalidFontFormatException($"No widths array was found in the font dictionary for this TrueType font: {dictionary}.");
+            }
+
+            return widthArray.Select(x => ((ICosNumber)x).AsDecimal()).ToArray();
+        }
+
+        private FontDescriptor GetFontDescriptor(PdfDictionary dictionary, IRandomAccessRead reader, bool isLenientParsing)
+        {
+            if (!dictionary.TryGetItemOfType(CosName.FONT_DESC, out CosObject obj))
+            {
+                throw new InvalidFontFormatException($"No font descriptor indirect reference found in the TrueType font: {dictionary}.");
+            }
+
+            var parsed = pdfObjectParser.Parse(obj.ToIndirectReference(), reader, isLenientParsing);
+
+            if (!(parsed is PdfDictionary descriptorDictionary))
+            {
+                throw new InvalidFontFormatException($"Expected a font descriptor dictionary but instead found {parsed}.");
+            }
+
+            var descriptor = fontDescriptorFactory.Generate(descriptorDictionary, isLenientParsing);
+
+            return descriptor;
+        }
+
+        private TrueTypeFont ParseTrueTypeFont(FontDescriptor descriptor, IRandomAccessRead reader,
+            bool isLenientParsing)
+        {
+            if (descriptor?.FontFile == null)
+            {
+                return null;
+            }
+
+            if (descriptor.FontFile.FileType != DescriptorFontFile.FontFileType.TrueType)
+            {
+                throw new InvalidFontFormatException(
+                    $"Expected a TrueType font in the TrueType font descriptor, instead it was {descriptor.FontFile.FileType}.");
+            }
+
+            var fontFileStream = pdfObjectParser.Parse(descriptor.FontFile.ObjectKey, reader, isLenientParsing) as PdfRawStream;
+
+            if (fontFileStream == null)
+            {
+                return null;
+            }
+
+            var fontFile = fontFileStream.Decode(filterProvider);
+
+            var font = trueTypeFontParser.Parse(new TrueTypeDataBytes(new ByteArrayInputBytes(fontFile)));
+
+            return font;
+        }
+
+        private static CosName GetName(PdfDictionary dictionary, FontDescriptor descriptor)
+        {
+            if (dictionary.TryGetName(CosName.BASE_FONT, out CosName name))
+            {
+                return name;
+            }
+
+            if (descriptor.FontName != null)
+            {
+                return descriptor.FontName;
+            }
+
+            throw new InvalidFontFormatException($"Could not find a name for this TrueType font {dictionary}.");
+        }
     }
 }

src/UglyToad.Pdf/Fonts/Simple/TrueTypeSimpleFont.cs

@@ -0,0 +1,75 @@
+namespace UglyToad.Pdf.Fonts.Simple
+{
+    using Cmap;
+    using Composite;
+    using Cos;
+    using Geometry;
+    using IO;
+    using Util.JetBrains.Annotations;
+
+    internal class TrueTypeSimpleFont : IFont
+    {
+        private readonly int firstCharacterCode;
+        private readonly int lastCharacterCode;
+        private readonly decimal[] widths;
+        private readonly FontDescriptor descriptor;
+
+        public CosName Name { get; }
+
+        public bool IsVertical { get; }
+
+        [NotNull]
+        public ToUnicodeCMap ToUnicode { get; set; }
+
+        public TrueTypeSimpleFont(CosName name, int firstCharacterCode, int lastCharacterCode, decimal[] widths, 
+            FontDescriptor descriptor,
+            [CanBeNull]CMap toUnicodeCMap)
+        {
+            this.firstCharacterCode = firstCharacterCode;
+            this.lastCharacterCode = lastCharacterCode;
+            this.widths = widths;
+            this.descriptor = descriptor;
+
+            Name = name;
+            IsVertical = false;
+            ToUnicode = new ToUnicodeCMap(toUnicodeCMap);
+        }
+
+        public int ReadCharacterCode(IInputBytes bytes, out int codeLength)
+        {
+            codeLength = 1;
+            return bytes.CurrentByte;
+        }
+
+        public bool TryGetUnicode(int characterCode, out string value)
+        {
+            value = null;
+
+            if (!ToUnicode.CanMapToUnicode)
+            {
+                return false;
+            }
+
+            return ToUnicode.TryGet(characterCode, out value);
+        }
+
+        public PdfVector GetDisplacement(int characterCode)
+        {
+            var tx = GetWidth(characterCode);
+
+            return new PdfVector(tx / 1000m, 0);
+        }
+
+        public decimal GetWidth(int characterCode)
+        {
+            var index = characterCode - firstCharacterCode;
+            
+            if (index < 0 || index >= widths.Length)
+            {
+                return descriptor.MissingWidth;
+            }
+
+            return widths[index];
+        }
+    }
+}

src/UglyToad.Pdf/Parser/PdfDocumentFactory.cs

@@ -68,10 +68,11 @@
 
             var cMapCache = new CMapCache(new CMapParser());
 
-            var fontFactory = new FontFactory(container.Get<ILog>(), new Type0FontHandler(cidFontFactory,
+            var fontFactory = new FontFactory(log, new Type0FontHandler(cidFontFactory,
                 cMapCache, 
                 filterProvider,
-                pdfObjectParser));
+                pdfObjectParser),
+                new TrueTypeFontHandler(pdfObjectParser, filterProvider, cMapCache, fontDescriptorFactory, trueTypeFontParser));
 
             var dynamicParser = container.Get<DynamicParser>();
             var resourceContainer = new ResourceContainer(pdfObjectParser, fontFactory);

src/UglyToad.Pdf/UglyToad.Pdf.csproj

@@ -228,8 +228,4 @@
     <EmbeddedResource Include="Resources\CMap\V" />
   </ItemGroup>
   
-  <ItemGroup>
-    <Folder Include="Fonts\Simple\" />
-  </ItemGroup>
-  
 </Project>