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Refactored CALLDATALOAD to use big int

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* Added BigMin
This commit is contained in:
obscuren
2014-07-21 20:38:43 +02:00
parent eab0b2a90a
commit 20ee1ae65e
3 changed files with 27 additions and 18 deletions
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ethchain/vm.go
+9 -5
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@@ -503,13 +503,17 @@ func (vm *Vm) RunClosure(closure *Closure) (ret []byte, err error) {
vm.Printf(" => %v", vm.vars.Value)
case CALLDATALOAD:
require(1)
offset := stack.Pop().Int64()
var (
offset = stack.Pop()
data = make([]byte, 32)
lenData = big.NewInt(int64(len(closure.Args)))
)
data := make([]byte, 32)
if big.NewInt(int64(len(closure.Args))).Cmp(big.NewInt(offset)) >= 0 {
l := int64(math.Min(float64(offset+32), float64(len(closure.Args))))
if lenData.Cmp(offset) >= 0 {
length := new(big.Int).Add(offset, ethutil.Big32)
length = ethutil.BigMin(length, lenData)
copy(data, closure.Args[offset:l])
copy(data, closure.Args[offset.Int64():length.Int64()])
}
vm.Printf(" => 0x%x", data)