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/*-
* Copyright 2019 Square Inc.
*
* 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 generator
import "io"
// Base64Reader wraps an input stream consisting of either standard or url-safe
// base64 data, and maps it to a raw (unpadded) standard encoding. This can be used
// to read any base64-encoded data as input, whether padded, unpadded, standard or
// url-safe.
type Base64Reader struct {
In io.Reader
}
func (r Base64Reader) Read(p []byte) (n int, err error) {
n, err = r.In.Read(p)
for i := 0; i < n; i++ {
switch p[i] {
// Map - to +
case 0x2D:
p[i] = 0x2B
// Map _ to /
case 0x5F:
p[i] = 0x2F
// Strip =
case 0x3D:
n = i
break
default:
}
}
if n == 0 {
err = io.EOF
}
return
}
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