Throw an error instead of fatal error

onevcat · Dec 21, 2016 · 252ae33 · 252ae33
1 parent 9ba3918
commit 252ae33
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/APNGKit/Disassembler.swift b/APNGKit/Disassembler.swift
@@ -75,6 +75,7 @@ public enum DisassemblerError: Error {
     case pngStructureFailure
     case pngInternalError
     case fileSizeExceeded
+    case invalidAPNGMeta
 }
 
 /**
@@ -358,7 +359,7 @@ class Disassembler {
             frames.append(frame)
         }
         guard let apngMeta = apngMeta else {
-            fatalError("The APNG meta should exists.")
+            throw DisassemblerError.invalidAPNGMeta
         }
         return (frames, apngMeta)
     }
@@ -367,7 +368,9 @@ class Disassembler {
         try prepare()
         clean()
 
-        guard let apngMeta = apngMeta else { fatalError("The apng meta should exists") }
+        guard let apngMeta = apngMeta else {
+            throw DisassemblerError.invalidAPNGMeta
+        }
         return apngMeta
     }