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accounts/abi: differentiate between static and dynamic arrays (#3121)

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solves #3119

Signed-off-by: VoR0220 <rj@erisindustries.com>
This commit is contained in:
RJ 2016-11-03 17:25:19 -05:00 committed by Jeffrey Wilcke
parent ed2bc7fbe9
commit 2ad5dba50a
4 changed files with 65 additions and 27 deletions
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28
accounts/abi/abi.go
View File

@ -98,19 +98,25 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
case HashTy: // hash must be of slice hash
refSlice = reflect.ValueOf([]common.Hash(nil))
case FixedBytesTy:
refSlice = reflect.ValueOf([]byte(nil))
refSlice = reflect.ValueOf([][]byte(nil))
default: // no other types are supported
return nil, fmt.Errorf("abi: unsupported slice type %v", elem.T)
}
var slice []byte
var size int
var offset int
if t.Type.IsSlice {
// get the offset which determines the start of this array ...
offset := int(common.BytesToBig(output[index : index+32]).Uint64())
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:]
slice = output[offset:]
// ... starting with the size of the array in elements ...
size := int(common.BytesToBig(slice[:32]).Uint64())
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.
@ -120,6 +126,18 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
// reslice to match the required size
slice = slice[:(size * 32)]
} else if t.Type.IsArray {
//get the number of elements in the array
size = t.Type.SliceSize
//check to make sure array size matches up
if index+32*size > len(output) {
return nil, fmt.Errorf("abi: cannot marshal in to go array: offset %d would go over slice boundary (len=%d)", len(output), index+32*size)
}
//slice is there for a fixed amount of times
slice = output[index : index+size*32]
}
for i := 0; i < size; i++ {
var (
inter interface{} // interface type
@ -136,6 +154,8 @@ func toGoSlice(i int, t Argument, output []byte) (interface{}, error) {
inter = common.BytesToAddress(returnOutput)
case HashTy:
inter = common.BytesToHash(returnOutput)
case FixedBytesTy:
inter = returnOutput
}
// append the item to our reflect slice
refSlice = reflect.Append(refSlice, reflect.ValueOf(inter))

25
accounts/abi/abi_test.go
View File

@ -357,8 +357,6 @@ func TestMethodPack(t *testing.T) {
}
sig := abi.Methods["slice"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
@ -406,8 +404,6 @@ func TestMethodPack(t *testing.T) {
}
sig = abi.Methods["slice256"].Id()
sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
@ -931,6 +927,7 @@ func TestUnmarshal(t *testing.T) {
{ "name" : "bytes", "constant" : false, "outputs": [ { "type": "bytes" } ] },
{ "name" : "fixed", "constant" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "multi", "constant" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
{ "name" : "intArraySingle", "constant" : false, "outputs": [ { "type": "uint256[3]" } ] },
{ "name" : "addressSliceSingle", "constant" : false, "outputs": [ { "type": "address[]" } ] },
{ "name" : "addressSliceDouble", "constant" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
{ "name" : "mixedBytes", "constant" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
@ -1083,6 +1080,26 @@ func TestUnmarshal(t *testing.T) {
t.Errorf("expected %x, got %x", fixed, out[1])
}
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000003"))
// marshal int array
var intArray [3]*big.Int
err = abi.Unpack(&intArray, "intArraySingle", buff.Bytes())
if err != nil {
t.Error(err)
}
var testAgainstIntArray [3]*big.Int
testAgainstIntArray[0] = big.NewInt(1)
testAgainstIntArray[1] = big.NewInt(2)
testAgainstIntArray[2] = big.NewInt(3)
for i, Int := range intArray {
if Int.Cmp(testAgainstIntArray[i]) != 0 {
t.Errorf("expected %v, got %v", testAgainstIntArray[i], Int)
}
}
// marshal address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) // offset

4
accounts/abi/reflect.go
View File

@ -78,10 +78,6 @@ func set(dst, src reflect.Value, output Argument) error {
case dstType.AssignableTo(src.Type()):
dst.Set(src)
case dstType.Kind() == reflect.Array && srcType.Kind() == reflect.Slice:
if !dstType.Elem().AssignableTo(r_byte) {
return fmt.Errorf("abi: cannot unmarshal %v in to array of elem %v", src.Type(), dstType.Elem())
}
if dst.Len() < output.Type.SliceSize {
return fmt.Errorf("abi: cannot unmarshal src (len=%d) in to dst (len=%d)", output.Type.SliceSize, dst.Len())
}

7
accounts/abi/type.go
View File

@ -170,6 +170,7 @@ func (t Type) pack(v reflect.Value) ([]byte, error) {
if (t.IsSlice || t.IsArray) && t.T != BytesTy && t.T != FixedBytesTy {
var packed []byte
for i := 0; i < v.Len(); i++ {
val, err := t.Elem.pack(v.Index(i))
if err != nil {
@ -177,7 +178,11 @@ func (t Type) pack(v reflect.Value) ([]byte, error) {
}
packed = append(packed, val...)
}
if t.IsSlice {
return packBytesSlice(packed, v.Len()), nil
} else if t.IsArray {
return packed, nil
}
}
return packElement(t, v), nil
@ -186,5 +191,5 @@ func (t Type) pack(v reflect.Value) ([]byte, error) {
// requireLengthPrefix returns whether the type requires any sort of length
// prefixing.
func (t Type) requiresLengthPrefix() bool {
return t.T != FixedBytesTy && (t.T == StringTy || t.T == BytesTy || t.IsSlice || t.IsArray)
return t.T != FixedBytesTy && (t.T == StringTy || t.T == BytesTy || t.IsSlice)
}