Started the iterating over Data at the startIndex.

Data uses slices which may not start at 0. When a Data is supplied which does not start at 0, the first index previously used would throw a bad access exception.

This happened for example with a Data value returns from CBOR previously. It does not per-se start with a slice at 0.

Author: joskuijpers

Sources/CBORCoding/CBORParser.swift

@@ -20,10 +20,10 @@ internal class CBORParser {
         guard !data.isEmpty else { return nil }
 
         var storage = Storage()
-        var index: Int = 0
+        var index: Int = data.startIndex
 
         do {
-            while index < data.count {
+            while index < data.endIndex {
                 let majorType = CBOR.majorType(for: data[index])
 
                 switch majorType {