forked from TrueCloudLab/restic
81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
// Copyright 2017, Google
|
|
//
|
|
// Licensed 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 base
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
)
|
|
|
|
func noEscape(c byte) bool {
|
|
switch c {
|
|
case '.', '_', '-', '/', '~', '!', '$', '\'', '(', ')', '*', ';', '=', ':', '@':
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func escape(s string) string {
|
|
// cribbed from url.go, kinda
|
|
b := &bytes.Buffer{}
|
|
for i := 0; i < len(s); i++ {
|
|
switch c := s[i]; {
|
|
case c == '/':
|
|
b.WriteByte(c)
|
|
case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || '0' <= c && c <= '9':
|
|
b.WriteByte(c)
|
|
case noEscape(c):
|
|
b.WriteByte(c)
|
|
default:
|
|
fmt.Fprintf(b, "%%%X", c)
|
|
}
|
|
}
|
|
return b.String()
|
|
}
|
|
|
|
func unescape(s string) (string, error) {
|
|
b := &bytes.Buffer{}
|
|
for i := 0; i < len(s); i++ {
|
|
c := s[i]
|
|
switch c {
|
|
case '/':
|
|
b.WriteString("/")
|
|
case '+':
|
|
b.WriteString(" ")
|
|
case '%':
|
|
if len(s)-i < 3 {
|
|
return "", errors.New("unescape: bad encoding")
|
|
}
|
|
b.WriteByte(unhex(s[i+1])<<4 | unhex(s[i+2]))
|
|
i += 2
|
|
default:
|
|
b.WriteByte(c)
|
|
}
|
|
}
|
|
return b.String(), nil
|
|
}
|
|
|
|
func unhex(c byte) byte {
|
|
switch {
|
|
case '0' <= c && c <= '9':
|
|
return c - '0'
|
|
case 'a' <= c && c <= 'f':
|
|
return c - 'a' + 10
|
|
case 'A' <= c && c <= 'F':
|
|
return c - 'A' + 10
|
|
}
|
|
return 0
|
|
}
|