Add decompiled APK source code (JADX)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

decompiled/sources/com/google/android/gms/internal/fido/zzfk.java

@@ -0,0 +1,34 @@
+package com.google.android.gms.internal.fido;
+
+/* loaded from: classes3.dex */
+public final class zzfk {
+    public static Object zza(Object obj, String str) {
+        if (obj != null) {
+            return obj;
+        }
+        throw new NullPointerException(str.concat(" must not be null"));
+    }
+
+    public static String zzb(String str) {
+        if (str.isEmpty()) {
+            throw new IllegalArgumentException("identifier must not be empty");
+        }
+        if (!zzc(str.charAt(0))) {
+            throw new IllegalArgumentException("identifier must start with an ASCII letter: ".concat(str));
+        }
+        for (int i = 1; i < str.length(); i++) {
+            char charAt = str.charAt(i);
+            if (!zzc(charAt) && ((charAt < '0' || charAt > '9') && charAt != '_')) {
+                throw new IllegalArgumentException("identifier must contain only ASCII letters, digits or underscore: ".concat(str));
+            }
+        }
+        return str;
+    }
+
+    private static boolean zzc(char c) {
+        if (c < 'a' || c > 'z') {
+            return c >= 'A' && c <= 'Z';
+        }
+        return true;
+    }
+}