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int.go
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/
int.go
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package forge
import (
"bytes"
"math/big"
"github.com/dipdup-net/go-lib/tools/base"
"github.com/dipdup-net/go-lib/tools/types"
)
// Int -
type Int base.Node
// NewInt -
func NewInt() *Int {
return &Int{
IntValue: types.NewBigInt(0),
}
}
// Unforge -
func (val *Int) Unforge(data []byte) (int, error) {
buffer := new(bytes.Buffer)
for i := range data {
buffer.WriteByte(data[i])
if data[i] < 128 {
break
}
}
parts := buffer.Bytes()
for i := len(parts) - 1; i > 0; i-- {
num := int64(parts[i] & 0x7f)
val.IntValue.Int = val.IntValue.Lsh(val.IntValue.Int, 7)
val.IntValue.Int = val.IntValue.Or(val.IntValue.Int, big.NewInt(num))
}
if len(parts) > 0 {
num := int64(parts[0] & 0x3f)
val.IntValue.Int = val.IntValue.Lsh(val.IntValue.Int, 6)
val.IntValue.Int = val.IntValue.Or(val.IntValue.Int, big.NewInt(num))
if parts[0]&0x40 > 0 {
val.IntValue.Int = val.IntValue.Neg(val.IntValue.Int)
}
}
return buffer.Len(), nil
}
// Forge -
func (val *Int) Forge() ([]byte, error) {
data, err := ForgeInt(val.IntValue)
if err != nil {
return nil, err
}
return append([]byte{ByteInt}, data...), nil
}