Tiff decoder can now handle special case, when rowsPerStrip has the default value

src/ImageSharp/Formats/Tiff/TiffDecoderCore.cs

@@ -34,6 +34,11 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff
         /// </summary>
         private BufferedReadStream inputStream;
 
+        /// <summary>
+        /// RowsPerStrip default value, which is effectively infinity.
+        /// </summary>
+        private const int RowsPerStripInfinity = 2147483647;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="TiffDecoderCore" /> class.
         /// </summary>
@@ -281,6 +286,12 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff
         private void DecodeStripsChunky<TPixel>(ImageFrame<TPixel> frame, int rowsPerStrip, Number[] stripOffsets, Number[] stripByteCounts, int width)
            where TPixel : unmanaged, IPixel<TPixel>
         {
+            // If the rowsPerStrip has the default value, which is effectively infinity. That is, the entire image is one strip.
+            if (rowsPerStrip == RowsPerStripInfinity)
+            {
+                rowsPerStrip = frame.Height;
+            }
+
             int uncompressedStripSize = this.CalculateStripBufferSize(frame.Width, rowsPerStrip);
             int bitsPerPixel = this.BitsPerPixel;
 

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -137,6 +137,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         [WithFile(CcittFax3AllMakeupCodes, PixelTypes.Rgba32)]
         [WithFile(Calliphora_Fax3Compressed, PixelTypes.Rgba32)]
         [WithFile(Calliphora_Fax3Compressed_WithEolPadding, PixelTypes.Rgba32)]
+        [WithFile(Fax3Uncompressed, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_Fax3Compressed<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 

tests/ImageSharp.Tests/TestImages.cs

@@ -522,6 +522,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string Calliphora_RgbPackbits = "Tiff/Calliphora_rgb_packbits.tiff";
             public const string Calliphora_RgbUncompressed = "Tiff/Calliphora_rgb_uncompressed.tiff";
             public const string Calliphora_Fax3Compressed = "Tiff/Calliphora_ccitt_fax3.tiff";
+            public const string Fax3Uncompressed = "Tiff/ccitt_fax3_uncompressed.tiff";
             public const string Calliphora_Fax3Compressed_WithEolPadding = "Tiff/Calliphora_ccitt_fax3_with_eol_padding.tiff";
             public const string Calliphora_Fax4Compressed = "Tiff/Calliphora_ccitt_fax4.tiff";
             public const string Calliphora_HuffmanCompressed = "Tiff/Calliphora_huffman_rle.tiff";

tests/Images/Input/Tiff/ccitt_fax3_uncompressed.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f60615dea1b417ec125bf365b7c3a7c15ee2381947eb29dae2c34655fd0c2530
+size 821