decode struct + fix uint decoding

src/solidity/types/Struct.js

@@ -8,7 +8,15 @@ function Struct (memberDetails) {
 }
 
 Struct.prototype.decodeFromStorage = function (location, storageContent) {
-  return '<not implemented yet>'
+  var ret = {}
+  this.members.map(function (item, i) {
+    var globalLocation = {
+      offset: location.offset + item.location.offset,
+      slot: location.slot + item.location.slot
+    }
+    ret[item.name] = item.type.decodeFromStorage(globalLocation, storageContent)
+  })
+  return ret
 }
 
 module.exports = Struct

test/solidity/contracts/structArrayStorage.js

@@ -0,0 +1,29 @@
+'use strict'
+
+module.exports = {
+  contract: `contract structArrayStorage {
+    struct intStruct {
+        int8 i8;
+        int16 i16;
+        uint32 ui32;
+        int i256;
+        uint16 ui16;
+        int32 i32;
+    }
+    intStruct intStructDec;
+    function structArrayStorage () {
+        intStructDec.i8 = 32;
+        intStructDec.i16 = -54;
+        intStructDec.ui32 = 128;
+        intStructDec.i256 = -1243565465756;
+        intStructDec.ui16 = 34556;
+        intStructDec.i32 = -345446546;
+    }
+}
+`,
+  storage: {
+    '0x0000000000000000000000000000000000000000000000000000000000000000': '0x0000000000000000000000000000000000000000000000000000000080ffca20',
+    '0x0000000000000000000000000000000000000000000000000000000000000001': '0xfffffffffffffffffffffffffffffffffffffffffffffffffffffede75b8df64',
+    '0x0000000000000000000000000000000000000000000000000000000000000002': '0x0000000000000000000000000000000000000000000000000000eb68e76e86fc'
+  }
+}

test/solidity/storageDecoder.js

@@ -7,6 +7,7 @@ tape('solidity', function (t) {
   t.test('storage decoder', function (st) {
     testIntStorage(st)
     testByteStorage(st)
+    testStructArrayStorage(st)
     st.end()
   })
 })
@@ -197,3 +198,15 @@ function shrinkStorage (storage) {
   }
   return shrinkedStorage
 }
+
+function testStructArrayStorage (st) {
+  var structArrayStorage = require('./contracts/structArrayStorage')
+  var output = compiler.compile(structArrayStorage.contract, 0)
+  var decoded = stateDecoder.solidityState(structArrayStorage.storage, output.sources, 'structArrayStorage')
+  st.equal(decoded['intStructDec']['i8'], '32')
+  st.equal(decoded['intStructDec']['i16'], '-54')
+  st.equal(decoded['intStructDec']['ui32'], '128')
+  st.equal(decoded['intStructDec']['i256'], '-1243565465756')
+  st.equal(decoded['intStructDec']['ui16'], '34556')
+  st.equal(decoded['intStructDec']['i32'], '-345446546')
+}