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authorobscuren <geffobscura@gmail.com>2015-01-27 23:19:21 +0800
committerobscuren <geffobscura@gmail.com>2015-01-27 23:19:21 +0800
commitaa5b29e2f291322991ceab231267d19b19af72a2 (patch)
tree00ddbb5e4b2c16c406df6c134133988155dc3678 /accounts/abi/numbers.go
parent382726fde4b9b7656c4f4a96b6985fc816e3a7ce (diff)
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Implemented contract ABI
Diffstat (limited to 'accounts/abi/numbers.go')
-rw-r--r--accounts/abi/numbers.go106
1 files changed, 106 insertions, 0 deletions
diff --git a/accounts/abi/numbers.go b/accounts/abi/numbers.go
new file mode 100644
index 000000000..378f6541e
--- /dev/null
+++ b/accounts/abi/numbers.go
@@ -0,0 +1,106 @@
+package abi
+
+import (
+ "math/big"
+ "reflect"
+
+ "github.com/ethereum/go-ethereum/ethutil"
+)
+
+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 ethutil.LeftPadBytes(ethutil.U256(n).Bytes(), 32)
+}
+
+func S256(n *big.Int) []byte {
+ sint := ethutil.S256(n)
+ ret := ethutil.LeftPadBytes(sint.Bytes(), 32)
+ if sint.Cmp(ethutil.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
+}