Cleanup ifdefs and revise hashing algorithm

QRCoder.Xaml/XamlQRCode.cs

@@ -1,5 +1,4 @@
-#if NETFRAMEWORK || NET5_0_WINDOWS || NET6_0_WINDOWS
-using System;
+using System;
 using System.Windows;
 using System.Windows.Media;
 using static QRCoder.QRCodeGenerator;
@@ -93,5 +92,3 @@ public static DrawingImage GetQRCode(string plainText, int pixelsPerModule, stri
         }
     }
 }
-
-#endif

QRCoder/ArtQRCode.cs

@@ -1,4 +1,4 @@
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 
 using System;
 using System.Drawing;
@@ -9,7 +9,7 @@
 // pull request raised to extend library used. 
 namespace QRCoder
 {
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     public class ArtQRCode : AbstractQRCode, IDisposable
@@ -121,7 +121,7 @@
                         {
                             var finderPatternSize = 7 * pixelsPerModule;
                             var finderPatternOffset = drawQuietZones ? 4 * pixelsPerModule : 0;
                             graphics.DrawImage(finderPatternImage, new Rectangle(finderPatternOffset, finderPatternOffset, finderPatternSize, finderPatternSize));
                             graphics.DrawImage(finderPatternImage, new Rectangle(size - finderPatternOffset - finderPatternSize, finderPatternOffset, finderPatternSize, finderPatternSize));
                             graphics.DrawImage(finderPatternImage, new Rectangle(finderPatternOffset, size - finderPatternOffset - finderPatternSize, finderPatternSize, finderPatternSize));
                         }
@@ -154,12 +154,12 @@
 
             // center the dot in the module and crop to stay the right size.
             var cropped = new Bitmap(pixelsPerModule, pixelsPerModule);
             using (var graphics = Graphics.FromImage(cropped))
             {
                 graphics.DrawImage(bitmap, new Rectangle(margin, margin, pixelWidth, pixelWidth),
                     new RectangleF(((float)pixelSize - pixelWidth) / 2, ((float)pixelSize - pixelWidth) / 2, pixelWidth, pixelWidth),
                     GraphicsUnit.Pixel);
                 graphics.Save();
             }
 
             return cropped;
@@ -258,7 +258,7 @@
         }
     }
 
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     public static class ArtQRCodeHelper

QRCoder/Base64QRCode.cs

@@ -62,7 +62,7 @@
                 return Convert.ToBase64String(pngData, Base64FormattingOptions.None);
             }
 
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 #pragma warning disable CA1416 // Validate platform compatibility
             var qr = new QRCode(QrCodeData);
             var base64 = string.Empty;
@@ -77,7 +77,7 @@
 #endif
         }
 
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 #if NET6_0_OR_GREATER
         [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
@@ -93,7 +93,7 @@
         }
 #endif
 
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 #if NET6_0_OR_GREATER
         [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
@@ -103,21 +103,21 @@
             ImageFormat iFormat;
             switch (imgType) {
                 case ImageType.Png:
                     iFormat = ImageFormat.Png;
                     break;
                 case ImageType.Jpeg:
                     iFormat = ImageFormat.Jpeg;
                     break;
                 case ImageType.Gif:
                     iFormat = ImageFormat.Gif;
                     break;
                 default:
                     iFormat = ImageFormat.Png;
                     break;
             }
             using (MemoryStream memoryStream = new MemoryStream())
             {
                 bmp.Save(memoryStream, iFormat);
                 base64 = Convert.ToBase64String(memoryStream.ToArray(), Base64FormattingOptions.None);
             }
             return base64;

QRCoder/PayloadGenerator.cs

@@ -2516,14 +2516,10 @@ public override string ToString()
                 var cp = characterSet.ToString().Replace("_", "-");
                 var bytes = ToBytes();
 
-#if !NET35_OR_GREATER && !NETSTANDARD1_3_OR_GREATER
+#if NETCOREAPP
                 System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
 #endif
-#if NETSTANDARD1_3              
-                return Encoding.GetEncoding(cp).GetString(bytes,0,bytes.Length);
-#else
-                return Encoding.GetEncoding(cp).GetString(bytes);
-#endif
+                return Encoding.GetEncoding(cp).GetString(bytes, 0, bytes.Length);
             }
 
             /// <summary>
@@ -2536,7 +2532,7 @@ public byte[] ToBytes()
             {
                 //Setup byte encoder
                 //Encode return string as byte[] with correct CharacterSet
-#if !NET35_OR_GREATER
+#if !NETFRAMEWORK   // -- why different ifdef than line 2519? --
                 Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
 #endif
                 var cp = this.characterSet.ToString().Replace("_", "-");

QRCoder/PdfByteQRCode.cs

@@ -1,4 +1,4 @@
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 using System;
 using System.Collections.Generic;
 using System.Drawing.Imaging;
@@ -11,7 +11,7 @@
 namespace QRCoder
 {
 
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     // ReSharper disable once InconsistentNaming
@@ -213,7 +213,7 @@ public byte[] GetGraphic(int pixelsPerModule, string darkColorHtmlHex, string li
         }
     }
 
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     public static class PdfByteQRCodeHelper

QRCoder/QRCode.cs

@@ -1,12 +1,12 @@
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
 using System;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using static QRCoder.QRCodeGenerator;
 
 namespace QRCoder
 {
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     public class QRCode : AbstractQRCode, IDisposable
@@ -128,7 +128,7 @@ internal GraphicsPath CreateRoundedRectanglePath(RectangleF rect, int cornerRadi
         }
     }
 
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
     [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
     public static class QRCodeHelper

QRCoder/QRCodeData.cs

@@ -21,11 +21,12 @@ public QRCodeData(int version)
             for (var i = 0; i < size; i++)
                 this.ModuleMatrix.Add(new BitArray(size));
         }
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0
+
+        [Obsolete("This constructor will be removed in version 2.0.0.")]
         public QRCodeData(string pathToRawData, Compression compressMode) : this(File.ReadAllBytes(pathToRawData), compressMode)
         {
         }
-#endif
+
         public QRCodeData(byte[] rawData, Compression compressMode)
         {
             var bytes = new List<byte>(rawData);
@@ -154,12 +155,11 @@ public byte[] GetRawData(Compression compressMode)
             return rawData;
         }
 
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0
+        [Obsolete("This constructor will be removed in version 2.0.0.")]
         public void SaveRawData(string filePath, Compression compressMode)
         {
             File.WriteAllBytes(filePath, GetRawData(compressMode));
         }
-#endif
 
         public int Version { get; private set; }
 

QRCoder/QRCodeGenerator.cs

@@ -1107,11 +1107,7 @@ private static string ConvertToIso8859(string value, string Iso = "ISO-8859-2")
             Encoding utf8 = Encoding.UTF8;
             byte[] utfBytes = utf8.GetBytes(value);
             byte[] isoBytes = Encoding.Convert(utf8, iso, utfBytes);
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0
             return iso.GetString(isoBytes);
-#else
-            return iso.GetString(isoBytes, 0, isoBytes.Length);
-#endif
         }
 
         private static string PlainTextToBinaryByte(string plainText, EciMode eciMode, bool utf8BOM, bool forceUtf8)

QRCoder/QRCoder.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <TargetFrameworks>net35;net40;netstandard1.3;netstandard2.0;net5.0;net5.0-windows;net6.0;net6.0-windows</TargetFrameworks>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
+    <DefineConstants Condition="'$(TargetFramework)' != 'net6.0' AND '$(TargetFramework)' != 'netstandard1.3'">$(DefineConstants);SYSTEM_DRAWING</DefineConstants>
     <DefineConstants Condition="'$(TargetFramework)' == 'net5.0-windows'">$(DefineConstants);NET5_0_WINDOWS</DefineConstants>
     <DefineConstants Condition="'$(TargetFramework)' == 'net6.0-windows'">$(DefineConstants);NET6_0_WINDOWS</DefineConstants>
     <CheckEolTargetFramework>false</CheckEolTargetFramework>
@@ -48,9 +49,10 @@
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' or '$(TargetFramework)' == 'net5.0' or '$(TargetFramework)' == 'net5.0-windows' ">
     <PackageReference Include="System.Drawing.Common" Version="5.0.3" />
   </ItemGroup>
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net6.0-windows' ">
-		<PackageReference Include="System.Drawing.Common" Version="6.0.0" />
-	</ItemGroup>
+
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net6.0-windows' ">
+    <PackageReference Include="System.Drawing.Common" Version="6.0.0" />
+  </ItemGroup>
 
   <PropertyGroup>
     <FrameworkPathOverride Condition="'$(TargetFramework)' == 'net35'">$(MSBuildProgramFiles32)\Reference Assemblies\Microsoft\Framework\.NETFramework\v3.5\Profile\Client</FrameworkPathOverride>

QRCoder/SvgQRCode.cs

@@ -1,4 +1,4 @@
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0_OR_GREATER
+#if !NETSTANDARD1_3
 using QRCoder.Extensions;
 using System;
 using System.Collections;
@@ -267,14 +267,14 @@ public class SvgLogo
             private object _logoRaw;
             private bool _isEmbedded;
 
-#if NETFRAMEWORK || NETSTANDARD2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
             /// <summary>
             /// Create a logo object to be used in SvgQRCode renderer
             /// </summary>
             /// <param name="iconRasterized">Logo to be rendered as Bitmap/rasterized graphic</param>
             /// <param name="iconSizePercent">Degree of percentage coverage of the QR code by the logo</param>
             /// <param name="fillLogoBackground">If true, the background behind the logo will be cleaned</param>
-#if NET6_0_WINDOWS
+#if NET6_0_OR_GREATER
             [System.Runtime.Versioning.SupportedOSPlatform("windows")]
 #endif
             public SvgLogo(Bitmap iconRasterized, int iconSizePercent = 15, bool fillLogoBackground = true)

QRCoderTests/ArtQRCodeRendererTests.cs

@@ -1,4 +1,4 @@
-#if !NETCOREAPP1_1 && !NET6_0
+#if SYSTEM_DRAWING
 
 using Xunit;
 using QRCoder;
@@ -23,7 +23,7 @@ public void can_create_standard_qrcode_graphic()
             var bmp = new ArtQRCode(data).GetGraphic(10);
 
             var result = HelperFunctions.BitmapToHash(bmp);
-            result.ShouldBe("cb38c3156eaf13cdfba699bdafc3a84c");
+            result.ShouldBe("df510ce9feddc0dd8c23c54e700abbf0");
         }
 
         [Fact]
@@ -40,7 +40,7 @@ public void can_create_standard_qrcode_graphic_with_custom_finder()
             var bmp = new ArtQRCode(data).GetGraphic(10, Color.Black, Color.White, Color.Transparent, finderPatternImage: finder);
 
             var result = HelperFunctions.BitmapToHash(bmp);
-            result.ShouldBe("5df3f2892eeb01e9c282ad10f642dec2");
+            result.ShouldBe("e28a3779b9b975b85984e36f596c9a35");
         }
 
         [Fact]
@@ -52,7 +52,7 @@ public void can_create_standard_qrcode_graphic_without_quietzone()
             var bmp = new ArtQRCode(data).GetGraphic(10, Color.Black, Color.White, Color.Transparent, drawQuietZones: false);
 
             var result = HelperFunctions.BitmapToHash(bmp);
-            result.ShouldBe("632315c8695416fc82fe06a202688433");
+            result.ShouldBe("54408da26852d6c67ab7cad2656da7fa");
         }
 
         [Fact]
@@ -66,7 +66,7 @@ public void can_create_standard_qrcode_graphic_with_background()
 
             var result = HelperFunctions.BitmapToHash(bmp);
 
-            result.ShouldBe("bbea08507282773175cfe7b52f0ddae4");
+            result.ShouldBe("7f039ccde219ae78e4f768466376a17f");
         }
 
         [Fact]
@@ -99,7 +99,7 @@ public void can_render_artqrcode_from_helper()
             //Create QR code
             var bmp = ArtQRCodeHelper.GetQRCode("A", 10, Color.Black, Color.White, Color.Transparent, QRCodeGenerator.ECCLevel.L);
             var result = HelperFunctions.BitmapToHash(bmp);
-            result.ShouldBe("57ecaa9bdeadcdcbeac8a19d734907ff");
+            result.ShouldBe("a1975852df9b537344468bd44d54abe0");
         }
     }
 }

QRCoderTests/Base64QRCodeRendererTests.cs

@@ -55,7 +55,7 @@ public void can_render_base64_qrcode_transparent()
             base64QRCode.ShouldBe(Convert.ToBase64String(pngCodeGfx));
         }
 
-#if NETFRAMEWORK || NETCOREAPP2_0 || NET5_0 || NET6_0_WINDOWS
+#if SYSTEM_DRAWING
         [Fact]
         [Category("QRRenderer/Base64QRCode")]
         public void can_render_base64_qrcode_jpeg()

QRCoderTests/Helpers/CategoryDiscoverer.cs

@@ -1,14 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-#if !NET35 && !NET452
+#if !NETFRAMEWORK
 using Xunit.Abstractions;
 #endif
 using Xunit.Sdk;
 
 namespace QRCoderTests.Helpers.XUnitExtenstions
 {
-#if NET35 || NET452
+#if NETFRAMEWORK
     [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
     public class CategoryAttribute : Attribute
     {

QRCoderTests/Helpers/HelperFunctions.cs

@@ -2,10 +2,11 @@
 using System.Text;
 using System.IO;
 using System.Security.Cryptography;
+using System.Reflection;
 #if !NETCOREAPP1_1
 using System.Drawing;
 #endif
-#if NETFRAMEWORK || NET5_0_WINDOWS || NET6_0_WINDOWS
+#if TEST_XAML
 using SW = System.Windows;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
@@ -17,7 +18,7 @@ namespace QRCoderTests.Helpers
     public static class HelperFunctions
     {
 
-#if NETFRAMEWORK || NET5_0_WINDOWS || NET6_0_WINDOWS
+#if TEST_XAML
         public static BitmapSource ToBitmapSource(DrawingImage source)
         {
             DrawingVisual drawingVisual = new DrawingVisual();
@@ -44,34 +45,53 @@ public static Bitmap BitmapSourceToBitmap(DrawingImage xamlImg)
                 }
             }
         }
-#endif 
+#endif
 
-#if !NETCOREAPP1_1
         public static string GetAssemblyPath()
         {
             return
-#if NET5_0 || NET6_0
-            AppDomain.CurrentDomain.BaseDirectory;
-#elif NET35 || NET452
-            Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).Replace("file:\\", "");
+#if NET5_0_OR_GREATER
+                AppDomain.CurrentDomain.BaseDirectory;
+#elif NETFRAMEWORK
+                Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().CodeBase).Replace("file:\\", "");
+#elif NETCOREAPP1_1
+                Path.GetDirectoryName(typeof(HelperFunctions).GetTypeInfo().Assembly.Location).Replace("file:\\", "");
 #else
-            Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location).Replace("file:\\", "");
+                Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location).Replace("file:\\", "");
 #endif
         }
-#endif
 
 
 #if !NETCOREAPP1_1
-        public static string BitmapToHash(Bitmap bmp)
+        /// <summary>
+        /// Converts a bitmap to a hash string based on the pixel data
+        /// using a deterministic algorithm that ignores compression algorithm
+        /// differences across platforms.
+        /// </summary>
+        public static string BitmapToHash(Bitmap bitmap)
         {
-            byte[] imgBytes = null;
-            using (var ms = new MemoryStream())
+            // Lock the bitmap's bits.
+            var rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
+            var bitmapData = bitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+
+            byte[] rgbValues;
+            try
             {
-                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
-                imgBytes = ms.ToArray();
-                ms.Dispose();
+                // Create an array to hold the bytes of the bitmap.
+                int bytes = Math.Abs(bitmapData.Stride) * bitmap.Height;
+                rgbValues = new byte[bytes];
+
+                // Copy the RGB values into the array.
+                System.Runtime.InteropServices.Marshal.Copy(bitmapData.Scan0, rgbValues, 0, bytes);
+            }
+            finally
+            {
+                // Unlock the bits.
+                bitmap.UnlockBits(bitmapData);
             }
-            return ByteArrayToHash(imgBytes);
+
+            // Hash the resulting byte array
+            return ByteArrayToHash(rgbValues);
         }
 #endif