Add file type detection for PDF

Author: drewnoakes

MetadataExtractor/PublicAPI/net462/PublicAPI.Unshipped.txt

@@ -118,6 +118,7 @@ MetadataExtractor.Util.FileType.Avif = 28 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Dng = 29 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.GoPro = 30 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Kdc = 31 -> MetadataExtractor.Util.FileType
+MetadataExtractor.Util.FileType.Pdf = 35 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.ThreeFR = 32 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Pef = 33 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Srw = 34 -> MetadataExtractor.Util.FileType

MetadataExtractor/PublicAPI/net8.0/PublicAPI.Unshipped.txt

@@ -117,6 +117,7 @@ MetadataExtractor.Util.FileType.Avif = 28 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Dng = 29 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.GoPro = 30 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Kdc = 31 -> MetadataExtractor.Util.FileType
+MetadataExtractor.Util.FileType.Pdf = 35 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.ThreeFR = 32 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Pef = 33 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Srw = 34 -> MetadataExtractor.Util.FileType

MetadataExtractor/PublicAPI/netstandard1.3/PublicAPI.Unshipped.txt

@@ -118,6 +118,7 @@ MetadataExtractor.Util.FileType.Avif = 28 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Dng = 29 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.GoPro = 30 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Kdc = 31 -> MetadataExtractor.Util.FileType
+MetadataExtractor.Util.FileType.Pdf = 35 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.ThreeFR = 32 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Pef = 33 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Srw = 34 -> MetadataExtractor.Util.FileType

MetadataExtractor/PublicAPI/netstandard2.1/PublicAPI.Unshipped.txt

@@ -117,6 +117,7 @@ MetadataExtractor.Util.FileType.Avif = 28 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Dng = 29 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.GoPro = 30 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Kdc = 31 -> MetadataExtractor.Util.FileType
+MetadataExtractor.Util.FileType.Pdf = 35 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.ThreeFR = 32 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Pef = 33 -> MetadataExtractor.Util.FileType
 MetadataExtractor.Util.FileType.Srw = 34 -> MetadataExtractor.Util.FileType

MetadataExtractor/Util/FileType.cs

@@ -110,6 +110,8 @@ public enum FileType
 
         /// <summary>SRW (Samsung) Image File Format.</summary>
         Srw = 34,
+
+        Pdf = 35
     }
 
     public static class FileTypeExtensions
@@ -151,6 +153,7 @@ public static class FileTypeExtensions
             "3FR",
             "PEF",
             "SRW",
+            "PDF"
         ];
 
         private static readonly string[] _longNames =
@@ -190,6 +193,7 @@ public static class FileTypeExtensions
             "Hasselblad Raw",
             "Pentax Raw",
             "Samsung Raw",
+            "Portable Document Format"
         ];
 
         private static readonly string?[] _mimeTypes =
@@ -229,6 +233,7 @@ public static class FileTypeExtensions
             "image/x-hasselblad-3fr",
             "image/x-pentax-pef",
             "image/x-samsung-srw",
+            "application/pdf"
         ];
 
         private static readonly string[]?[] _extensions =
@@ -268,6 +273,7 @@ public static class FileTypeExtensions
             ["3fr"],
             ["pef"],
             ["srw"],
+            ["pdf"]
         ];
 
         public static string GetName(this FileType fileType)

MetadataExtractor/Util/FileTypeDetector.cs

@@ -45,6 +45,7 @@ public static class FileTypeDetector
             { FileType.Pcx, [0x0A, 0x02, 0x01] },
             { FileType.Pcx, [0x0A, 0x03, 0x01] },
             { FileType.Pcx, [0x0A, 0x05, 0x01] },
+            { FileType.Pdf, "%PDF"u8 },
             { FileType.Eps, "%!PS"u8 },
             { FileType.Eps, [0xC5, 0xD0, 0xD3, 0xC6] },
             // NOTE several file types match this, which we handle in TryDisambiguate: DNG, GPR (GoPro), KDC (Kodak), 3FR (Hasselblad)