46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package hexutil_test
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import (
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"encoding/json"
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"fmt"
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"github.com/ethereum/go-ethereum/common/hexutil"
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)
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type MyType [5]byte
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func (v *MyType) UnmarshalText(input []byte) error {
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return hexutil.UnmarshalFixedText("MyType", input, v[:])
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}
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func (v MyType) String() string {
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return hexutil.Bytes(v[:]).String()
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}
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func ExampleUnmarshalFixedText() {
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var v1, v2 MyType
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fmt.Println("v1 error:", json.Unmarshal([]byte(`"0x01"`), &v1))
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fmt.Println("v2 error:", json.Unmarshal([]byte(`"0x0101010101"`), &v2))
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fmt.Println("v2:", v2)
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// Output:
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// v1 error: hex string has length 2, want 10 for MyType
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// v2 error: <nil>
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// v2: 0x0101010101
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}
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