Protect against empty arrays

gavazquez · gavazquez · commit 2a9a98e182d2 · 2018-10-19T21:18:07.000+02:00
diff --git a/CachedQuickLz/CachedQlzCommon.cs b/CachedQuickLz/CachedQlzCommon.cs
@@ -38,6 +38,9 @@ public static int SizeCompressed(byte[] source)
         /// <returns>If the array is compressed with QuickLz or not</returns>
         public static bool IsCompressed(byte[] source, int length)
         {
+            if (source == null || source.Length < QlzConstants.QlzTrailLength || length < QlzConstants.QlzTrailLength)
+                return false;
+
             var trailEquals = true;
             for (var i = length - 1; i > length - QlzConstants.QlzTrailLength; i--)
             {

Original file line number	Diff line number	Diff line change
`@@ -38,6 +38,9 @@ public static int SizeCompressed(byte[] source)`
`38`	`38`	`/// <returns>If the array is compressed with QuickLz or not</returns>`
`39`	`39`	`public static bool IsCompressed(byte[] source, int length)`
`40`	`40`	`{`
	`41`	`+ if (source == null \|\| source.Length < QlzConstants.QlzTrailLength \|\| length < QlzConstants.QlzTrailLength)`
	`42`	`+ return false;`
	`43`	`+`
`41`	`44`	`var trailEquals = true;`
`42`	`45`	`for (var i = length - 1; i > length - QlzConstants.QlzTrailLength; i--)`
`43`	`46`	`{`