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size_helper.go
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/
size_helper.go
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package types
import (
"github.com/ethereum/go-ethereum/accounts/abi"
commontypes "github.com/smartcontractkit/chainlink-common/pkg/types"
)
func GetMaxSize(n int, args abi.Arguments) (int, error) {
size := 0
for _, arg := range args {
tmp := arg.Type
argSize, _, err := getTypeSize(n, &tmp, true, false)
if err != nil {
return 0, err
}
size += argSize
}
return size, nil
}
func getTypeSize(n int, t *abi.Type, dynamicTypeAllowed bool, isNested bool) (int, bool, error) {
// See https://docs.soliditylang.org/en/latest/abi-spec.html#formal-specification-of-the-encoding
switch t.T {
case abi.ArrayTy:
elmSize, _, err := getTypeSize(n, t.Elem, false, true)
return t.Size * elmSize, false, err
case abi.SliceTy:
if !dynamicTypeAllowed {
return 0, false, commontypes.ErrInvalidType
}
elmSize, _, err := getTypeSize(n, t.Elem, false, true)
return 32 /*header*/ + 32 /*footer*/ + elmSize*n, true, err
case abi.BytesTy, abi.StringTy:
if !dynamicTypeAllowed {
return 0, false, commontypes.ErrInvalidType
}
totalSize := (n + 31) / 32 * 32 // strings and bytes are padded to 32 bytes
return 32 /*header*/ + 32 /*footer*/ + totalSize, true, nil
case abi.TupleTy:
return getTupleSize(n, t, isNested)
default:
// types are padded to 32 bytes
return 32, false, nil
}
}
func getTupleSize(n int, t *abi.Type, isNested bool) (int, bool, error) {
// No header or footer, because if the tuple is dynamically sized we would need to know the inner slice sizes
// so it would return error for that element.
size := 0
dynamic := false
for _, elm := range t.TupleElems {
argSize, dynamicArg, err := getTypeSize(n, elm, !isNested, true)
if err != nil {
return 0, false, err
}
dynamic = dynamic || dynamicArg
size += argSize
}
if dynamic {
// offset for the element needs to be included there are dynamic elements
size += 32
}
return size, dynamic, nil
}