Fixing Qoi detector

LuisAlfredo92 · LuisAlfredo92 · commit a1342bf30a99 · 2023-06-12T21:00:22.000-06:00
-I had several errors about header size comparison and comparing byte arrays, but I've fixed them and tested the Identify function and it works perfect!
diff --git a/src/ImageSharp/Formats/Qoi/QoiImageFormatDetector.cs b/src/ImageSharp/Formats/Qoi/QoiImageFormatDetector.cs
@@ -23,5 +23,5 @@ public bool TryDetectFormat(ReadOnlySpan<byte> header, [NotNullWhen(true)] out I
     }
 
     private bool IsSupportedFileFormat(ReadOnlySpan<byte> header)
-        => header.Length == this.HeaderSize && header[..4] == QoiConstants.Magic;
+        => header.Length >= this.HeaderSize && QoiConstants.Magic.SequenceEqual(header[..4]);
 }
diff --git a/tests/ImageSharp.Tests/Formats/Qoi/QoiDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Qoi/QoiDecoderTests.cs
@@ -24,5 +24,6 @@ public void Identify(string imagePath)
         ImageInfo imageInfo = Image.Identify(stream);
 
         Assert.NotNull(imageInfo);
+        Assert.Equal(imageInfo.Metadata.DecodedImageFormat, ImageSharp.Formats.Qoi.QoiFormat.Instance);
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -23,5 +23,5 @@ public bool TryDetectFormat(ReadOnlySpan<byte> header, [NotNullWhen(true)] out I`
`23`	`23`	`}`
`24`	`24`
`25`	`25`	`private bool IsSupportedFileFormat(ReadOnlySpan<byte> header)`
`26`		`- => header.Length == this.HeaderSize && header[..4] == QoiConstants.Magic;`
	`26`	`+ => header.Length >= this.HeaderSize && QoiConstants.Magic.SequenceEqual(header[..4]);`
`27`	`27`	`}`
Original file line number	Diff line number	Diff line change
`@@ -24,5 +24,6 @@ public void Identify(string imagePath)`
`24`	`24`	`ImageInfo imageInfo = Image.Identify(stream);`
`25`	`25`
`26`	`26`	`Assert.NotNull(imageInfo);`
	`27`	`+ Assert.Equal(imageInfo.Metadata.DecodedImageFormat, ImageSharp.Formats.Qoi.QoiFormat.Instance);`
`27`	`28`	`}`
`28`	`29`	`}`