From 258e57c3c1c8f32753f04e5e2b9e443e205921bf Mon Sep 17 00:00:00 2001
From: BobLd <38405645+BobLd@users.noreply.github.com>
Date: Tue, 14 Oct 2025 10:08:50 +0100
Subject: [PATCH] Trim excess in long lived font collections

---
 .../CharStrings/Type2CharStringParser.cs               |  2 ++
 .../Charsets/CompactFontFormatIsoAdobeCharset.cs       |  4 ++++
 .../PdfFonts/Cmap/CharacterMapBuilder.cs               | 10 +++++++---
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
index af9b29da1..8e7f09cbf 100644
--- a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
+++ b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/CharStrings/Type2CharStringParser.cs
@@ -770,6 +770,8 @@ private static Type2CharStrings.CommandSequence ParseSingle(
                 }
             }
 
+            values.TrimExcess();
+
             return new Type2CharStrings.CommandSequence(values, commandIdentifiers);
         }
 
diff --git a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/Charsets/CompactFontFormatIsoAdobeCharset.cs b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/Charsets/CompactFontFormatIsoAdobeCharset.cs
index 656672475..8425c8d94 100644
--- a/src/UglyToad.PdfPig.Fonts/CompactFontFormat/Charsets/CompactFontFormatIsoAdobeCharset.cs
+++ b/src/UglyToad.PdfPig.Fonts/CompactFontFormat/Charsets/CompactFontFormatIsoAdobeCharset.cs
@@ -257,6 +257,10 @@ private CompactFontFormatIsoAdobeCharset()
                 gidToStringIdAndNameMap[gid++] = pair;
             }
 
+#if NET
+            gidToStringIdAndNameMap.TrimExcess();
+#endif
+
             glyphIdToStringIdAndName = gidToStringIdAndNameMap;
         }
 
diff --git a/src/UglyToad.PdfPig/PdfFonts/Cmap/CharacterMapBuilder.cs b/src/UglyToad.PdfPig/PdfFonts/Cmap/CharacterMapBuilder.cs
index 5fcbfea27..db22479c3 100644
--- a/src/UglyToad.PdfPig/PdfFonts/Cmap/CharacterMapBuilder.cs
+++ b/src/UglyToad.PdfPig/PdfFonts/Cmap/CharacterMapBuilder.cs
@@ -81,11 +81,15 @@ public void AddBaseFontCharacter(ReadOnlySpan<byte> bytes, string value)
 
         public CMap Build()
         {
+#if NET
+            BaseFontCharacterMap?.TrimExcess();
+#endif
+
             return new CMap(GetCidSystemInfo(), Type, WMode, Name, Version,
                 BaseFontCharacterMap ?? new Dictionary<int, string>(),
-                CodespaceRanges ?? new CodespaceRange[0],
-                CidRanges ?? new CidRange[0],
-                CidCharacterMappings ?? new CidCharacterMapping[0]);
+                CodespaceRanges ?? Array.Empty<CodespaceRange>(),
+                CidRanges ?? Array.Empty<CidRange>(),
+                CidCharacterMappings ?? Array.Empty<CidCharacterMapping>());
         }
 
         private CharacterIdentifierSystemInfo GetCidSystemInfo()