| // Copyright 2015 The LUCI Authors. |
| // |
| // 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 iotools |
| |
| import ( |
| "io" |
| ) |
| |
| // ByteSliceReader is an io.Reader and io.ByteReader implementation that reads |
| // and mutates an underlying byte slice. |
| type ByteSliceReader []byte |
| |
| var _ interface { |
| io.Reader |
| io.ByteReader |
| } = (*ByteSliceReader)(nil) |
| |
| // Read implements io.Reader. |
| func (r *ByteSliceReader) Read(buf []byte) (int, error) { |
| count := copy(buf, *r) |
| *r = (*r)[count:] |
| if len(*r) == 0 { |
| *r = nil |
| } |
| if count < len(buf) { |
| return count, io.EOF |
| } |
| return count, nil |
| } |
| |
| // ReadByte implements io.ByteReader. |
| func (r *ByteSliceReader) ReadByte() (byte, error) { |
| d := []byte{0} |
| _, err := r.Read(d) |
| return d[0], err |
| } |