Added handling for empty extension parameters in ImageFormatManager.TryFindFormatByFileExtension

Ollie-Ave · Ollie-Ave · commit ba57cf3f5cf3 · 2023-03-06T11:43:38.000Z
diff --git a/src/ImageSharp/Formats/ImageFormatManager.cs b/src/ImageSharp/Formats/ImageFormatManager.cs
@@ -102,9 +102,12 @@ public void AddImageFormat(IImageFormat format)
     /// <returns><see langword="true"/> if a match is found; otherwise, <see langword="false"/></returns>
     public bool TryFindFormatByFileExtension(string extension, [NotNullWhen(true)] out IImageFormat? format)
     {
-        if (extension[0] == '.')
+        if (!string.IsNullOrWhiteSpace(extension))
         {
-            extension = extension[1..];
+            if (extension[0] == '.')
+            {
+                extension = extension[1..];
+            }
         }
 
         format = this.imageFormats.FirstOrDefault(x =>

Original file line number	Diff line number	Diff line change
`@@ -102,9 +102,12 @@ public void AddImageFormat(IImageFormat format)`
`102`	`102`	`/// <returns><see langword="true"/> if a match is found; otherwise, <see langword="false"/></returns>`
`103`	`103`	`public bool TryFindFormatByFileExtension(string extension, [NotNullWhen(true)] out IImageFormat? format)`
`104`	`104`	`{`
`105`		`- if (extension[0] == '.')`
	`105`	`+ if (!string.IsNullOrWhiteSpace(extension))`
`106`	`106`	`{`
`107`		`- extension = extension[1..];`
	`107`	`+ if (extension[0] == '.')`
	`108`	`+ {`
	`109`	`+ extension = extension[1..];`
	`110`	`+ }`
`108`	`111`	`}`
`109`	`112`
`110`	`113`	`format = this.imageFormats.FirstOrDefault(x =>`