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path: root/accounts/abi/abi.go
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-rw-r--r--accounts/abi/abi.go72
1 files changed, 71 insertions, 1 deletions
diff --git a/accounts/abi/abi.go b/accounts/abi/abi.go
index 01603b217..b0765e7db 100644
--- a/accounts/abi/abi.go
+++ b/accounts/abi/abi.go
@@ -20,6 +20,7 @@ import (
"encoding/json"
"fmt"
"io"
+ "math/big"
"reflect"
"strings"
@@ -116,11 +117,80 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
return append(method.Id(), arguments...), nil
}
+// toGoSliceType prses the input and casts it to the proper slice defined by the ABI
+// argument in T.
+func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
+ index := i * 32
+ // The slice must, at very least be large enough for the index+32 which is exactly the size required
+ // for the [offset in output, size of offset].
+ if index+32 > len(output) {
+ return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), index+32)
+ }
+
+ // first we need to create a slice of the type
+ var refSlice reflect.Value
+ switch t.Type.T {
+ case IntTy, UintTy, BoolTy: // int, uint, bool can all be of type big int.
+ refSlice = reflect.ValueOf([]*big.Int(nil))
+ case AddressTy: // address must be of slice Address
+ refSlice = reflect.ValueOf([]common.Address(nil))
+ case HashTy: // hash must be of slice hash
+ refSlice = reflect.ValueOf([]common.Hash(nil))
+ default: // no other types are supported
+ return nil, fmt.Errorf("abi: unsupported slice type %v", t.Type.T)
+ }
+ // get the offset which determines the start of this array ...
+ offset := int(common.BytesToBig(output[index : index+32]).Uint64())
+ if offset+32 > len(output) {
+ return nil, fmt.Errorf("abi: cannot marshal in to go slice: offset %d would go over slice boundary (len=%d)", len(output), offset+32)
+ }
+
+ slice := output[offset:]
+ // ... starting with the size of the array in elements ...
+ size := int(common.BytesToBig(slice[:32]).Uint64())
+ slice = slice[32:]
+ // ... and make sure that we've at the very least the amount of bytes
+ // available in the buffer.
+ if size*32 > len(slice) {
+ return nil, fmt.Errorf("abi: cannot marshal in to go slice: insufficient size output %d require %d", len(output), offset+32+size*32)
+ }
+
+ // reslice to match the required size
+ slice = slice[:(size * 32)]
+ for i := 0; i < size; i++ {
+ var (
+ inter interface{} // interface type
+ returnOutput = slice[i*32 : i*32+32] // the return output
+ )
+
+ // set inter to the correct type (cast)
+ switch t.Type.T {
+ case IntTy, UintTy:
+ inter = common.BytesToBig(returnOutput)
+ case BoolTy:
+ inter = common.BytesToBig(returnOutput).Uint64() > 0
+ case AddressTy:
+ inter = common.BytesToAddress(returnOutput)
+ case HashTy:
+ inter = common.BytesToHash(returnOutput)
+ }
+ // append the item to our reflect slice
+ refSlice = reflect.Append(refSlice, reflect.ValueOf(inter))
+ }
+
+ // return the interface
+ return refSlice.Interface(), nil
+}
+
// toGoType parses the input and casts it to the proper type defined by the ABI
// argument in T.
func toGoType(i int, t Argument, output []byte) (interface{}, error) {
- index := i * 32
+ // we need to treat slices differently
+ if t.Type.Kind == reflect.Slice {
+ return toGoSlice(i, t, output)
+ }
+ index := i * 32
if index+32 > len(output) {
return nil, fmt.Errorf("abi: cannot marshal in to go type: length insufficient %d require %d", len(output), index+32)
}