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package abi
import (
"math/big"
"reflect"
"github.com/ethereum/go-ethereum/common"
)
var big_t = reflect.TypeOf(&big.Int{})
var ubig_t = reflect.TypeOf(&big.Int{})
var byte_t = reflect.TypeOf(byte(0))
var byte_ts = reflect.TypeOf([]byte(nil))
var uint_t = reflect.TypeOf(uint(0))
var uint8_t = reflect.TypeOf(uint8(0))
var uint16_t = reflect.TypeOf(uint16(0))
var uint32_t = reflect.TypeOf(uint32(0))
var uint64_t = reflect.TypeOf(uint64(0))
var int_t = reflect.TypeOf(int(0))
var int8_t = reflect.TypeOf(int8(0))
var int16_t = reflect.TypeOf(int16(0))
var int32_t = reflect.TypeOf(int32(0))
var int64_t = reflect.TypeOf(int64(0))
var uint_ts = reflect.TypeOf([]uint(nil))
var uint8_ts = reflect.TypeOf([]uint8(nil))
var uint16_ts = reflect.TypeOf([]uint16(nil))
var uint32_ts = reflect.TypeOf([]uint32(nil))
var uint64_ts = reflect.TypeOf([]uint64(nil))
var ubig_ts = reflect.TypeOf([]*big.Int(nil))
var int_ts = reflect.TypeOf([]int(nil))
var int8_ts = reflect.TypeOf([]int8(nil))
var int16_ts = reflect.TypeOf([]int16(nil))
var int32_ts = reflect.TypeOf([]int32(nil))
var int64_ts = reflect.TypeOf([]int64(nil))
var big_ts = reflect.TypeOf([]*big.Int(nil))
// U256 will ensure unsigned 256bit on big nums
func U256(n *big.Int) []byte {
return common.LeftPadBytes(common.U256(n).Bytes(), 32)
}
func S256(n *big.Int) []byte {
sint := common.S256(n)
ret := common.LeftPadBytes(sint.Bytes(), 32)
if sint.Cmp(common.Big0) < 0 {
for i, b := range ret {
if b == 0 {
ret[i] = 1
continue
}
break
}
}
return ret
}
// S256 will ensure signed 256bit on big nums
func U2U256(n uint64) []byte {
return U256(big.NewInt(int64(n)))
}
func S2S256(n int64) []byte {
return S256(big.NewInt(n))
}
// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation
func packNum(value reflect.Value, to byte) []byte {
switch kind := value.Kind(); kind {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
if to == UintTy {
return U2U256(value.Uint())
} else {
return S2S256(int64(value.Uint()))
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if to == UintTy {
return U2U256(uint64(value.Int()))
} else {
return S2S256(value.Int())
}
case reflect.Ptr:
// This only takes care of packing and casting. No type checking is done here. It should be done prior to using this function.
if to == UintTy {
return U256(value.Interface().(*big.Int))
} else {
return S256(value.Interface().(*big.Int))
}
}
return nil
}
// checks whether the given reflect value is signed. This also works for slices with a number type
func isSigned(v reflect.Value) bool {
switch v.Type() {
case ubig_ts, big_ts, big_t, ubig_t:
return true
case int_ts, int8_ts, int16_ts, int32_ts, int64_ts, int_t, int8_t, int16_t, int32_t, int64_t:
return true
}
return false
}
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