#6 use the same base class for both type 1 and cff private dictionaries to enable comparisons and rationalise api

src/UglyToad.PdfPig/Fonts/AdobeStylePrivateDictionary.cs

@@ -0,0 +1,245 @@
+namespace UglyToad.PdfPig.Fonts
+{
+    using System;
+    using System.Collections.Generic;
+    using Util.JetBrains.Annotations;
+
+    /// <summary>
+    /// Holds common properties between Type 1 and Compact Font Format private dictionaries.
+    /// </summary>
+    internal abstract class AdobeStylePrivateDictionary
+    {
+        /// <summary>
+        /// Default value of <see cref="BlueScale"/>.
+        /// </summary>
+        public static readonly decimal DefaultBlueScale = 0.039625m;
+
+        /// <summary>
+        /// Default value of <see cref="ExpansionFactor"/>.
+        /// </summary>
+        public static readonly decimal DefaultExpansionFactor = 0.06m;
+
+        /// <summary>
+        /// Default value of <see cref="BlueFuzz"/>.
+        /// </summary>
+        public const int DefaultBlueFuzz = 1;
+
+        /// <summary>
+        /// Default value of <see cref="BlueShift"/>.
+        /// </summary>
+        public const int DefaultBlueShift = 7;
+
+        /// <summary>
+        /// Default value of <see cref="LanguageGroup"/>.
+        /// </summary>
+        public const int DefaultLanguageGroup = 0;
+        
+        /// <summary>
+        /// Required. An array containing an even number of integers.
+        /// The first pair is the baseline overshoot position and the baseline.
+        /// All following pairs describe top-zones.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<int> BlueValues { get; }
+
+        /// <summary>
+        /// Optional: Pairs of integers similar to <see cref="BlueValues"/>.
+        /// These only describe bottom zones.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<int> OtherBlues { get; }
+
+        /// <summary>
+        /// Optional: Integer pairs similar to <see cref="BlueValues"/> however these
+        /// are used to enforce consistency across a font family when there are small differences (&lt;1px) in
+        /// font alignment.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<int> FamilyBlues { get; }
+
+        /// <summary>
+        /// Optional: Integer pairs similar to <see cref="OtherBlues"/> however these
+        /// are used to enforce consistency across a font family with small differences 
+        /// in alignment similarly to <see cref="FamilyBlues"/>.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<int> FamilyOtherBlues { get; }
+
+        /// <summary>
+        /// Optional: The point size at which overshoot suppression stops.
+        /// The value is a related to the number of pixels tall that one character space unit will be
+        /// before overshoot suppression is switched off. Overshoot suppression enforces features to snap
+        /// to alignment zones when the point size is below that affected by this value.
+        /// Default: 0.039625
+        /// </summary>
+        /// <example>
+        /// A blue scale of 0.039625 switches overshoot suppression off at 10 points
+        /// on a 300 dpi device using the formula (for 300 dpi):
+        /// BlueScale = (pointsize - 0.49)/240
+        /// For example, if you wish overshoot suppression to turn off at 11
+        /// points on a 300-dpi device, you should set BlueScale to
+        /// (11 − 0.49) ÷ 240 or 0.04379
+        /// </example>
+        public decimal BlueScale { get; }
+
+        /// <summary>
+        /// Optional: The character space distance beyond the flat position of alignment zones
+        /// at which overshoot enforcement occurs.
+        /// Default: 7
+        /// </summary>
+        public int BlueShift { get; }
+
+        /// <summary>
+        /// Optional: The number of character space units to extend an alignment zone
+        /// on a horizontal stem.
+        /// If the top or bottom of a horizontal stem is within BlueFuzz units outside a top-zone
+        /// then the stem top/bottom is treated as if it were within the zone.
+        /// Default: 1
+        /// </summary>
+        public int BlueFuzz { get; }
+
+        /// <summary>
+        /// Optional: The dominant width of horizontal stems vertically in character space units.
+        /// </summary>
+        public decimal? StandardHorizontalWidth { get; }
+
+        /// <summary>
+        /// Optional: The dominant width of vertical stems horizontally in character space units.
+        /// </summary>
+        public decimal? StandardVerticalWidth { get; }
+
+        /// <summary>
+        /// Optional: Up to 12 numbers with the most common widths for horizontal stems vertically in character space units.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<decimal> StemSnapHorizontalWidths { get; }
+
+        /// <summary>
+        /// Optional: Up to 12 numbers with the most common widths for vertical stems horizontally in character space units.
+        /// </summary>
+        [NotNull]
+        public IReadOnlyList<decimal> StemSnapVerticalWidths { get; }
+
+        /// <summary>
+        /// Optional: At small sizes at low resolutions this controls whether bold characters should appear thicker using
+        /// special techniques.
+        /// </summary>
+        public bool ForceBold { get; }
+
+        /// <summary>
+        /// Optional: Language group 0 includes Latin, Greek and Cyrillic as well as similar alphabets.
+        /// Language group 1 includes Chinese, Japanese Kanji and Korean Hangul as well as similar alphabets.
+        /// Default: 0
+        /// </summary>
+        public int LanguageGroup { get; }
+
+        /// <summary>
+        /// Optional: The limit for changing the size of a character bounding box for
+        /// <see cref="LanguageGroup"/> 1 counters during font processing.
+        /// </summary>
+        public decimal ExpansionFactor { get; }
+        
+        /// <summary>
+        /// Creates a new <see cref="AdobeStylePrivateDictionary"/>.
+        /// </summary>
+        /// <param name="builder">The builder used to gather property values.</param>
+        protected AdobeStylePrivateDictionary([NotNull] BaseBuilder builder)
+        {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            BlueValues = builder.BlueValues ?? Array.Empty<int>();
+            OtherBlues = builder.OtherBlues ?? Array.Empty<int>();
+            FamilyBlues = builder.FamilyBlues ?? Array.Empty<int>();
+            FamilyOtherBlues = builder.FamilyOtherBlues ?? Array.Empty<int>();
+            BlueScale = builder.BlueScale ?? DefaultBlueScale;
+            BlueFuzz = builder.BlueFuzz ?? DefaultBlueFuzz;
+            BlueShift = builder.BlueShift ?? DefaultBlueShift;
+            StandardHorizontalWidth = builder.StandardHorizontalWidth;
+            StandardVerticalWidth = builder.StandardVerticalWidth;
+            StemSnapHorizontalWidths = builder.StemSnapHorizontalWidths ?? Array.Empty<decimal>();
+            StemSnapVerticalWidths = builder.StemSnapVerticalWidths ?? Array.Empty<decimal>();
+            ForceBold = builder.ForceBold ?? false;
+            LanguageGroup = builder.LanguageGroup ?? DefaultLanguageGroup;
+            ExpansionFactor = builder.ExpansionFactor ?? DefaultExpansionFactor;
+        }
+
+        /// <summary>
+        /// A mutable builder which can set any property of the private dictionary and performs no validation.
+        /// </summary>
+        public abstract class BaseBuilder
+        {
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.BlueValues"/>.
+            /// </summary>
+            public IReadOnlyList<int> BlueValues { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.OtherBlues"/>.
+            /// </summary>
+            public IReadOnlyList<int> OtherBlues { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.FamilyBlues"/>.
+            /// </summary>
+            public IReadOnlyList<int> FamilyBlues { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.FamilyOtherBlues"/>.
+            /// </summary>
+            public IReadOnlyList<int> FamilyOtherBlues { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.BlueScale"/>.
+            /// </summary>
+            public decimal? BlueScale { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.BlueShift"/>.
+            /// </summary>
+            public int? BlueShift { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.BlueFuzz"/>.
+            /// </summary>
+            public int? BlueFuzz { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.StandardVerticalWidth"/>.
+            /// </summary>
+            public decimal? StandardHorizontalWidth { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.StandardVerticalWidth"/>.
+            /// </summary>
+            public decimal? StandardVerticalWidth { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.StemSnapHorizontalWidths"/>.
+            /// </summary>
+            public IReadOnlyList<decimal> StemSnapHorizontalWidths { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.StemSnapVerticalWidths"/>.
+            /// </summary>
+            public IReadOnlyList<decimal> StemSnapVerticalWidths { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.ForceBold"/>.
+            /// </summary>
+            public bool? ForceBold { get; set; }
+
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.LanguageGroup"/>.
+            /// </summary>
+            public int? LanguageGroup { get; set; }
+            
+            /// <summary>
+            /// <see cref="AdobeStylePrivateDictionary.ExpansionFactor"/>.
+            /// </summary>
+            public decimal? ExpansionFactor { get; set; }
+        }
+    }
+}

src/UglyToad.PdfPig/Fonts/CompactFontFormat/CompactFontFormatIndividualFontParser.cs

@@ -34,7 +34,7 @@
 
             var topDictionary = topLevelDictionaryReader.Read(individualData, stringIndex);
 
-            var privateDictionary = new CompactFontFormatPrivateDictionary();
+            var privateDictionary = CompactFontFormatPrivateDictionary.GetDefault();
 
             if (topDictionary.PrivateDictionarySizeAndOffset.Item2 >= 0)
             {
@@ -49,9 +49,9 @@
             }
 
             var localSubroutines = CompactFontFormatIndex.None;
-            if (privateDictionary.LocalSubroutineLocalOffset.HasValue)
+            if (privateDictionary.LocalSubroutineOffset.HasValue)
             {
-                data.Seek(privateDictionary.LocalSubroutineLocalOffset.Value);
+                data.Seek(privateDictionary.LocalSubroutineOffset.Value);
 
                 localSubroutines = indexReader.ReadDictionaryData(data);
             }

src/UglyToad.PdfPig/Fonts/CompactFontFormat/Dictionaries/CompactFontFormatDictionaryReader.cs

@@ -5,13 +5,13 @@
     using System.Text;
     using Geometry;
 
-    internal abstract class CompactFontFormatDictionaryReader<T>
+    internal abstract class CompactFontFormatDictionaryReader<TResult, TBuilder>
     {
         private readonly List<Operand> operands = new List<Operand>();
 
-        public abstract T Read(CompactFontFormatData data, IReadOnlyList<string> stringIndex);
+        public abstract TResult Read(CompactFontFormatData data, IReadOnlyList<string> stringIndex);
 
-        protected T ReadDictionary(T dictionary, CompactFontFormatData data, IReadOnlyList<string> stringIndex)
+        protected TBuilder ReadDictionary(TBuilder builder, CompactFontFormatData data, IReadOnlyList<string> stringIndex)
         {
             while (data.CanRead())
             {
@@ -35,7 +35,7 @@
                     {
                         var key = byte0 == 12 ? new OperandKey(byte0, data.ReadByte()) : new OperandKey(byte0); 
 
-                        ApplyOperation(dictionary, operands, key, stringIndex);
+                        ApplyOperation(builder, operands, key, stringIndex);
                         break;
                     }
 
@@ -87,7 +87,7 @@
                 }
             }
 
-            return dictionary;
+            return builder;
         }
 
         private static decimal ReadRealNumber(CompactFontFormatData data)
@@ -162,7 +162,7 @@
             return decimal.Parse(sb.ToString());
         }
 
-        protected abstract void ApplyOperation(T dictionary, List<Operand> operands, OperandKey operandKey, IReadOnlyList<string> stringIndex);
+        protected abstract void ApplyOperation(TBuilder builder, List<Operand> operands, OperandKey operandKey, IReadOnlyList<string> stringIndex);
 
         protected static string GetString(List<Operand> operands, IReadOnlyList<string> stringIndex)
         {
@@ -232,6 +232,28 @@
             return defaultValue;
         }
 
+        protected static int[] ReadDeltaToIntArray(List<Operand> operands)
+        {
+            var results = new int[operands.Count];
+
+            if (operands.Count == 0)
+            {
+                return results;
+            }
+
+            results[0] = (int)operands[0].Decimal;
+
+            for (var i = 1; i < operands.Count; i++)
+            {
+                var previous = results[i - 1];
+                var current = operands[i].Decimal;
+
+                results[i] = (int)(previous + current);
+            }
+
+            return results;
+        }
+
         protected static decimal[] ReadDeltaToArray(List<Operand> operands)
         {
             var results = new decimal[operands.Count];

src/UglyToad.PdfPig/Fonts/CompactFontFormat/Dictionaries/CompactFontFormatPrivateDictionary.cs

@@ -1,47 +1,65 @@
 namespace UglyToad.PdfPig.Fonts.CompactFontFormat.Dictionaries
 {
-    internal class CompactFontFormatPrivateDictionary
+    internal class CompactFontFormatPrivateDictionary : AdobeStylePrivateDictionary
     {
-        public decimal[] BlueValues { get; set; }
+        /// <summary>
+        /// Compatibility entry.
+        /// </summary>
+        public decimal InitialRandomSeed { get; }
 
-        public decimal[] OtherBlues { get; set; }
+        /// <summary>
-
+        /// The offset in bytes for the local subroutine index in this font. The value is relative to this private dictionary.
-        public decimal[] FamilyBlues { get; set; }
+        /// </summary>
-
+        public int? LocalSubroutineOffset { get; }
-        public decimal[] FamilyOtherBlues { get; set; }
-
-        public decimal BlueScale { get; set; } = 0.039625m;
-
-        public decimal BlueShift { get; set; } = 7;
-
-        public decimal BlueFuzz { get; set; } = 1;
-
-        public decimal StandardHorizontalWidth { get; set; }
-
-        public decimal StandardVerticalWidth { get; set; }
-
-        public decimal[] StemSnapHorizontal { get; set; }
-
-        public decimal[] StemStapVertical { get; set; }
-
-        public bool ForceBold { get; set; }
-
-        public decimal LanguageGroup { get; set; }
-
-        public decimal ExpansionFactor { get; set; }
-
-        public decimal InitialRandomSeed { get; set; }
-
-        public int? LocalSubroutineLocalOffset { get; set; }
 
         /// <summary>
         /// If a glyph's width equals the default width X it can be omitted from the charstring.
         /// </summary>
-        public decimal DefaultWidthX { get; set; }
+        public decimal DefaultWidthX { get; }
 
         /// <summary>
         /// If not equal to <see cref="DefaultWidthX"/>, Glyph width is computed by adding the charstring width to the nominal width X value.
         /// </summary>
-        public decimal NominalWidthX { get; set; }
+        public decimal NominalWidthX { get; }
+
+        /// <inheritdoc />
+        /// <summary>
+        /// Create a new <see cref="T:UglyToad.PdfPig.Fonts.CompactFontFormat.Dictionaries.CompactFontFormatPrivateDictionary" />.
+        /// </summary>
+        /// <param name="builder">The builder used to gather property values.</param>
+        public CompactFontFormatPrivateDictionary(Builder builder) : base(builder)
+        {
+            InitialRandomSeed = builder.InitialRandomSeed;
+            LocalSubroutineOffset = builder.LocalSubroutineOffset;
+            DefaultWidthX = builder.DefaultWidthX;
+            NominalWidthX = builder.NominalWidthX;
+        }
+
+        public static CompactFontFormatPrivateDictionary GetDefault()
+        {
+            return new Builder().Build();
+        }
+
+        public class Builder : BaseBuilder
+        {
+            public decimal InitialRandomSeed { get; set; }
+
+            public int? LocalSubroutineOffset { get; set; }
+
+            /// <summary>
+            /// If a glyph's width equals the default width X it can be omitted from the charstring.
+            /// </summary>
+            public decimal DefaultWidthX { get; set; }
+
+            /// <summary>
+            /// If not equal to <see cref="DefaultWidthX"/>, Glyph width is computed by adding the charstring width to the nominal width X value.
+            /// </summary>
+            public decimal NominalWidthX { get; set; }
+
+            public CompactFontFormatPrivateDictionary Build()
+            {
+                return new CompactFontFormatPrivateDictionary(this);
+            }
+        }
     }
 }

src/UglyToad.PdfPig/Fonts/CompactFontFormat/Dictionaries/CompactFontFormatPrivateDictionaryReader.cs

@@ -3,32 +3,32 @@
     using System;
     using System.Collections.Generic;
 
-    internal class CompactFontFormatPrivateDictionaryReader : CompactFontFormatDictionaryReader<CompactFontFormatPrivateDictionary>
+    internal class CompactFontFormatPrivateDictionaryReader : CompactFontFormatDictionaryReader<CompactFontFormatPrivateDictionary, CompactFontFormatPrivateDictionary.Builder>
     {
         public override CompactFontFormatPrivateDictionary Read(CompactFontFormatData data, IReadOnlyList<string> stringIndex)
         {
-            var dictionary = new CompactFontFormatPrivateDictionary();
+            var builder = new CompactFontFormatPrivateDictionary.Builder();
 
-            ReadDictionary(dictionary, data, stringIndex);
+            ReadDictionary(builder, data, stringIndex);
 
-            return dictionary;
+            return builder.Build();
         }
 
-        protected override void ApplyOperation(CompactFontFormatPrivateDictionary dictionary, List<Operand> operands, OperandKey operandKey, IReadOnlyList<string> stringIndex)
+        protected override void ApplyOperation(CompactFontFormatPrivateDictionary.Builder dictionary, List<Operand> operands, OperandKey operandKey, IReadOnlyList<string> stringIndex)
         {
             switch (operandKey.Byte0)
             {
                 case 6:
-                    dictionary.BlueValues = ReadDeltaToArray(operands);
+                    dictionary.BlueValues = ReadDeltaToIntArray(operands);
                     break;
                 case 7:
-                    dictionary.OtherBlues = ReadDeltaToArray(operands);
+                    dictionary.OtherBlues = ReadDeltaToIntArray(operands);
                     break;
                 case 8:
-                    dictionary.FamilyBlues = ReadDeltaToArray(operands);
+                    dictionary.FamilyBlues = ReadDeltaToIntArray(operands);
                     break;
                 case 9:
-                    dictionary.FamilyOtherBlues = ReadDeltaToArray(operands);
+                    dictionary.FamilyOtherBlues = ReadDeltaToIntArray(operands);
                     break;
                 case 10:
                     dictionary.StandardHorizontalWidth = operands[0].Decimal;
@@ -49,22 +49,22 @@
                             dictionary.BlueScale = operands[0].Decimal;
                             break;
                         case 10:
-                            dictionary.BlueShift = operands[0].Decimal;
+                            dictionary.BlueShift = operands[0].Int;
                             break;
                         case 11:
-                            dictionary.BlueFuzz = operands[0].Decimal;
+                            dictionary.BlueFuzz = operands[0].Int;
                             break;
                         case 12:
-                            dictionary.StemSnapHorizontal = ReadDeltaToArray(operands);
+                            dictionary.StemSnapHorizontalWidths = ReadDeltaToArray(operands);
                             break;
                         case 13:
-                            dictionary.StemStapVertical = ReadDeltaToArray(operands);
+                            dictionary.StemSnapVerticalWidths = ReadDeltaToArray(operands);
                             break;
                         case 14:
                             dictionary.ForceBold = operands[0].Decimal == 1;
                             break;
                         case 17:
-                            dictionary.LanguageGroup = operands[0].Decimal;
+                            dictionary.LanguageGroup = operands[0].Int;
                             break;
                         case 18:
                             dictionary.ExpansionFactor = operands[0].Decimal;
@@ -76,7 +76,7 @@
                 }
                     break;
                 case 19:
-                    dictionary.LocalSubroutineLocalOffset = GetIntOrDefault(operands, -1);
+                    dictionary.LocalSubroutineOffset = GetIntOrDefault(operands, -1);
                     break;
                 case 20:
                     dictionary.DefaultWidthX = operands[0].Decimal;

src/UglyToad.PdfPig/Fonts/CompactFontFormat/Dictionaries/CompactFontFormatTopLevelDictionaryReader.cs

@@ -4,7 +4,7 @@
     using System.Collections.Generic;
     using Core;
 
-    internal class CompactFontFormatTopLevelDictionaryReader : CompactFontFormatDictionaryReader<CompactFontFormatTopLevelDictionary>
+    internal class CompactFontFormatTopLevelDictionaryReader : CompactFontFormatDictionaryReader<CompactFontFormatTopLevelDictionary, CompactFontFormatTopLevelDictionary>
     {
         public override CompactFontFormatTopLevelDictionary Read(CompactFontFormatData data, IReadOnlyList<string> stringIndex)
         {

src/UglyToad.PdfPig/Fonts/Type1/Type1PrivateDictionary.cs

@@ -3,6 +3,7 @@
     using System;
     using System.Collections.Generic;
     using Parser;
+    using Util.JetBrains.Annotations;
 
     /// <summary>
     /// The Private dictionary for a Type 1 font contains hints that apply across all characters in the font. These hints
@@ -12,132 +13,13 @@
     /// Note that subroutines are also defined in the private dictionary however for the purposes of this API they are
     /// stored on the parent <see cref="Type1FontProgram"/>.
     /// </summary>
-    internal class Type1PrivateDictionary
+    internal class Type1PrivateDictionary : AdobeStylePrivateDictionary
     {
-        /// <summary>
-        /// Default value of <see cref="BlueScale"/>.
-        /// </summary>
-        public static readonly decimal DefaultBlueScale = 0.039625m;
-
-        /// <summary>
-        /// Default value of <see cref="ExpansionFactor"/>.
-        /// </summary>
-        public static readonly decimal DefaultExpansionFactor = 0.06m;
-
-        /// <summary>
-        /// Default value of <see cref="BlueFuzz"/>.
-        /// </summary>
-        public const int DefaultBlueFuzz = 1;
-        
-        /// <summary>
-        /// Default value of <see cref="BlueShift"/>.
-        /// </summary>
-        public const int DefaultBlueShift = 7;
-
-        /// <summary>
-        /// Default value of <see cref="LanguageGroup"/>.
-        /// </summary>
-        public const int DefaultLanguageGroup = 0;
-
         /// <summary>
         /// Optional: Uniquely identifies this font.
         /// </summary>
         public int? UniqueId { get; set; }
-
-        /// <summary>
-        /// Required. An array containing an even number of integers.
-        /// The first pair is the baseline overshoot position and the baseline.
-        /// All following pairs describe top-zones.
-        /// </summary>
-        public IReadOnlyList<int> BlueValues { get; }
-
-        /// <summary>
-        /// Optional: Pairs of integers similar to <see cref="BlueValues"/>.
-        /// These only describe bottom zones.
-        /// </summary>
-        public IReadOnlyList<int> OtherBlues { get; }
-
-        /// <summary>
-        /// Optional: Integer pairs similar to <see cref="BlueValues"/> however these
-        /// are used to enforce consistency across a font family when there are small differences (&lt;1px) in
-        /// font alignment.
-        /// </summary>
-        public IReadOnlyList<int> FamilyBlues { get; }
-
-        /// <summary>
-        /// Optional: Integer pairs similar to <see cref="OtherBlues"/> however these
-        /// are used to enforce consistency across a font family with small differences 
-        /// in alignment similarly to <see cref="FamilyBlues"/>.
-        /// </summary>
-        public IReadOnlyList<int> FamilyOtherBlues { get; }
-
-        /// <summary>
-        /// Optional: The point size at which overshoot suppression stops.
-        /// The value is a related to the number of pixels tall that one character space unit will be
-        /// before overshoot suppression is switched off. Overshoot suppression enforces features to snap
-        /// to alignment zones when the point size is below that affected by this value.
-        /// Default: 0.039625
-        /// </summary>
-        /// <example>
-        /// A blue scale of 0.039625 switches overshoot suppression off at 10 points
-        /// on a 300 dpi device using the formula (for 300 dpi):
-        /// BlueScale = (pointsize - 0.49)/240
-        /// For example, if you wish overshoot suppression to turn off at 11
-        /// points on a 300-dpi device, you should set BlueScale to
-        /// (11 − 0.49) ÷ 240 or 0.04379
-        /// </example>
-        public decimal BlueScale { get; }
-
-        /// <summary>
-        /// Optional: The character space distance beyond the flat position of alignment zones
-        /// at which overshoot enforcement occurs.
-        /// Default: 7
-        /// </summary>
-        public int BlueShift { get; }
-
-        /// <summary>
-        /// Optional: The number of character space units to extend an alignment zone
-        /// on a horizontal stem.
-        /// If the top or bottom of a horizontal stem is within BlueFuzz units outside a top-zone
-        /// then the stem top/bottom is treated as if it were within the zone.
-        /// Default: 1
-        /// </summary>
-        public int BlueFuzz { get; }
-
-        /// <summary>
-        /// Optional: The dominant width of horizontal stems vertically in character space units.
-        /// </summary>
-        public decimal? StandardHorizontalWidth { get; }
-
-        /// <summary>
-        /// Optional: The dominant width of vertical stems horizontally in character space units.
-        /// </summary>
-        public decimal? StandardVerticalWidth { get; }
-
-        /// <summary>
-        /// Optional: Up to 12 numbers with the most common widths for horizontal stems vertically in character space units.
-        /// </summary>
-        public IReadOnlyList<decimal> StemSnapHorizontalWidths { get; }
         
-        /// <summary>
-        /// Optional: Up to 12 numbers with the most common widths for vertical stems horizontally in character space units.
-        /// </summary>
-        public IReadOnlyList<decimal> StemSnapVerticalWidths { get; }
-
-        /// <summary>
-        /// Optional: At small sizes at low resolutions this controls whether bold characters should appear thicker using
-        /// special techniques.
-        /// </summary>
-        public bool ForceBold { get; }
-
-        /// <summary>
-        /// Optional: Language group 0 includes Latin, Greek and Cyrillic as well as similar alphabets.
-        /// Language group 1 includes Chinese, Japanese Kanji and Korean Hangul as well as similar alphabets.
-        /// If language group is 1 then <see cref="RoundStemUp"/> should also be set.
-        /// Default: 0
-        /// </summary>
-        public int LanguageGroup { get; }
-
         /// <summary>
         /// Optional: Indicates the number of random bytes used for charstring encryption/decryption.
         /// Default: 4
@@ -145,16 +27,10 @@
         public int LenIv { get; }
 
         /// <summary>
-        /// Optional: Preserved for backwards compatibility. Must be set if the <see cref="LanguageGroup"/> is 1.
+        /// Optional: Preserved for backwards compatibility. Must be set if the <see cref="AdobeStylePrivateDictionary.LanguageGroup"/> is 1.
         /// </summary>
         public bool? RoundStemUp { get; }
 
-        /// <summary>
-        /// Optional: The limit for changing the size of a character bounding box for
-        /// <see cref="LanguageGroup"/> 1 counters during font processing.
-        /// </summary>
-        public decimal ExpansionFactor { get; }
-
         /// <summary>
         /// Required: Backwards compatibility.
         /// Default: 5839
@@ -165,13 +41,15 @@
         /// Required: Backwards compatibility.
         /// Default: {16 16}
         /// </summary>
+        [NotNull]
         public MinFeature MinFeature { get; } = new MinFeature(16, 16);
 
+        /// <inheritdoc />
         /// <summary>
-        /// Creates a new <see cref="Type1PrivateDictionary"/>.
+        /// Creates a new <see cref="T:UglyToad.PdfPig.Fonts.Type1.Type1PrivateDictionary" />.
         /// </summary>
         /// <param name="builder">The builder used to gather property values.</param>
-        public Type1PrivateDictionary(Builder builder)
+        public Type1PrivateDictionary([NotNull] Builder builder) : base(builder)
         {
             if (builder == null)
             {
@@ -179,28 +57,19 @@
             }
 
             UniqueId = builder.UniqueId;
-            BlueValues = builder.BlueValues ?? Array.Empty<int>();
-            OtherBlues = builder.OtherBlues ?? Array.Empty<int>();
-            FamilyBlues = builder.FamilyBlues ?? Array.Empty<int>();
-            FamilyOtherBlues = builder.FamilyOtherBlues ?? Array.Empty<int>();
-            BlueScale = builder.BlueScale ?? DefaultBlueScale;
-            BlueFuzz = builder.BlueFuzz ?? DefaultBlueFuzz;
-            BlueShift = builder.BlueShift ?? DefaultBlueShift;
-            StandardHorizontalWidth = builder.StandardHorizontalWidth;
-            StandardVerticalWidth = builder.StandardVerticalWidth;
-            StemSnapHorizontalWidths = builder.StemSnapHorizontalWidths ?? Array.Empty<decimal>();
-            StemSnapVerticalWidths = builder.StemSnapVerticalWidths ?? Array.Empty<decimal>();
-            ForceBold = builder.ForceBold ?? false;
-            LanguageGroup = builder.LanguageGroup ?? DefaultLanguageGroup;
             RoundStemUp = builder.RoundStemUp;
             LenIv = builder.LenIv;
-            ExpansionFactor = builder.ExpansionFactor ?? DefaultExpansionFactor;
+
+            if (builder.Password.HasValue)
+            {
+                Password = builder.Password.Value;
+            }
         }
 
         /// <summary>
         /// A mutable builder which can set any property of the private dictionary and performs no validation.
         /// </summary>
-        public class Builder
+        public class Builder : BaseBuilder
         {
             /// <summary>
             /// Temporary storage for the Rd procedure tokens.
@@ -231,72 +100,7 @@
             /// <see cref="Type1PrivateDictionary.UniqueId"/>.
             /// </summary>
             public int? UniqueId { get; set; }
-
+            
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.BlueValues"/>.
-            /// </summary>
-            public IReadOnlyList<int> BlueValues { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.OtherBlues"/>.
-            /// </summary>
-            public IReadOnlyList<int> OtherBlues { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.FamilyBlues"/>.
-            /// </summary>
-            public IReadOnlyList<int> FamilyBlues { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.FamilyOtherBlues"/>.
-            /// </summary>
-            public IReadOnlyList<int> FamilyOtherBlues { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.BlueScale"/>.
-            /// </summary>
-            public decimal? BlueScale { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.BlueShift"/>.
-            /// </summary>
-            public int? BlueShift { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.BlueFuzz"/>.
-            /// </summary>
-            public int? BlueFuzz { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.StandardVerticalWidth"/>.
-            /// </summary>
-            public decimal? StandardHorizontalWidth { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.StandardVerticalWidth"/>.
-            /// </summary>
-            public decimal? StandardVerticalWidth { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.StemSnapHorizontalWidths"/>.
-            /// </summary>
-            public IReadOnlyList<decimal> StemSnapHorizontalWidths { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.StemSnapVerticalWidths"/>.
-            /// </summary>
-            public IReadOnlyList<decimal> StemSnapVerticalWidths { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.ForceBold"/>.
-            /// </summary>
-            public bool? ForceBold { get; set; }
-
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.LanguageGroup"/>.
-            /// </summary>
-            public int? LanguageGroup { get; set; }
-
             /// <summary>
             /// <see cref="Type1PrivateDictionary.Password"/>.
             /// </summary>
@@ -317,16 +121,12 @@
             /// </summary>
             public bool? RoundStemUp { get; set; }
 
-            /// <summary>
-            /// <see cref="Type1PrivateDictionary.ExpansionFactor"/>.
-            /// </summary>
-            public decimal? ExpansionFactor { get; set; }
-
             /// <summary>
             /// Generate a <see cref="Type1PrivateDictionary"/> from the values in this builder.
             /// </summary>
             /// <returns>The generated <see cref="Type1PrivateDictionary"/>.</returns>
-            public Type1PrivateDictionary Build()
+            [NotNull]
+            public  Type1PrivateDictionary Build()
             {
                 return new Type1PrivateDictionary(this);
             }