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asciihex.go
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asciihex.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package util
import (
"encoding/hex"
"fmt"
)
type asciiHexEncoder struct {
}
func (*asciiHexEncoder) EncodeAll(s string) ([]byte, error) {
var bs []byte
for i := 0; i < len(s); i++ {
if s[i] == '\\' {
if i+1 >= len(s) {
return nil, fmt.Errorf("invalid asciihex string: %s", s)
}
i++
switch s[i] {
case 'n':
bs = append(bs, '\n')
case 'r':
bs = append(bs, '\r')
case 't':
bs = append(bs, '\t')
case '"':
bs = append(bs, '"')
case '\'':
bs = append(bs, '\'')
case '\\':
bs = append(bs, '\\')
case 'x', 'X':
if i+2 >= len(s) {
return nil, fmt.Errorf("invalid asciihex string: %s", s)
}
digit1 := s[i+1]
digit2 := s[i+2]
i += 2
var hexStr string
hexStr += string(digit1) + string(digit2)
bytes, err := hex.DecodeString(hexStr)
if err != nil {
return nil, err
}
if len(bytes) != 1 {
panic("two hex digits should be 1 byte")
}
bs = append(bs, bytes[0])
}
} else if s[i] >= 32 && s[i] <= 126 {
// valid ascii character
bs = append(bs, s[i])
} else {
return nil, fmt.Errorf("invalid asciihex string: %s", s)
}
}
return bs, nil
}
func (*asciiHexEncoder) DecodeAll(bytes []byte) (string, error) {
var s string
for _, c := range bytes {
hexByte := hex.EncodeToString([]byte{c})
s += "\\x" + hexByte
}
return s, nil
}
func (*asciiHexEncoder) String() string {
return "ASCIIHEX"
}