34 lines
561 B
Go
34 lines
561 B
Go
package bigint
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import (
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"math/big"
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"reflect"
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"github.com/ethereum/go-ethereum/common/hexutil"
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)
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// Unmarshals a u256 as a fixed-length hex string with 0x prefix and leading zeros
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type HexBigInt struct {
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*big.Int
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}
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const FixedLength = 32 // u256 -> 32 bytes
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var (
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hexBigIntT = reflect.TypeOf(HexBigInt{})
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)
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func (b *HexBigInt) UnmarshalJSON(input []byte) error {
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var buf [FixedLength]byte
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err := hexutil.UnmarshalFixedJSON(hexBigIntT, input, buf[:])
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if err != nil {
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return err
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}
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z := new(big.Int)
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z.SetBytes(buf[:])
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b.Int = z
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return nil
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}
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