- ABIDecoding getting data slice in followTheData changed to using start data index

Author: 6od9i

Sources/Web3Core/EthereumABI/ABIDecoding.swift

@@ -188,12 +188,12 @@ extension ABIDecoder {
     fileprivate static func followTheData(type: ABI.Element.ParameterType, data: Data, pointer: UInt64 = 0) -> (elementEncoding: Data?, nextElementPointer: UInt64?) {
         if type.isStatic {
             guard data.count >= pointer + type.memoryUsage else {return (nil, nil)}
-            let elementItself = data[pointer ..< pointer + type.memoryUsage]
+            let elementItself = data[data.indices.startIndex + Int(pointer) ..< data.indices.startIndex + Int(pointer + type.memoryUsage)]
             let nextElement = pointer + type.memoryUsage
             return (Data(elementItself), nextElement)
         } else {
             guard data.count >= pointer + type.memoryUsage else {return (nil, nil)}
-            let dataSlice = data[pointer ..< pointer + type.memoryUsage]
+            let dataSlice = data[data.indices.startIndex + Int(pointer) ..< data.indices.startIndex + Int(pointer + type.memoryUsage)]
             let bn = BigUInt(dataSlice)
             if bn > UInt64.max || bn >= data.count {
                 // there are ERC20 contracts that use bytes32 instead of string. Let's be optimistic and return some data