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231e468e19
git-subtree-dir: erigon-lib git-subtree-mainline:3c8cbda809git-subtree-split:93d9c9d9fe
46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
/*
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Copyright 2021 Erigon contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package hexutility
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import (
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"encoding/json"
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"errors"
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"reflect"
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)
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// UnmarshalFixedJSON decodes the input as a string with 0x prefix. The length of out
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// determines the required input length. This function is commonly used to implement the
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// UnmarshalJSON method for fixed-size types.
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func UnmarshalFixedJSON(typ reflect.Type, input, out []byte) error {
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if !isString(input) {
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return &json.UnmarshalTypeError{Value: "non-string", Type: typ}
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}
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return wrapTypeError(UnmarshalFixedText(typ.String(), input[1:len(input)-1], out), typ)
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}
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func isString(input []byte) bool {
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return len(input) >= 2 && input[0] == '"' && input[len(input)-1] == '"'
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}
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func wrapTypeError(err error, typ reflect.Type) error {
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var dec *decError
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if errors.As(err, &dec) {
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return &json.UnmarshalTypeError{Value: err.Error(), Type: typ}
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}
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return err
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}
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