| // Copyright 2015 The etcd 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 ioutil implements I/O utility functions. |
| package ioutil |
| |
| import "io" |
| |
| // NewLimitedBufferReader returns a reader that reads from the given reader |
| // but limits the amount of data returned to at most n bytes. |
| func NewLimitedBufferReader(r io.Reader, n int) io.Reader { |
| return &limitedBufferReader{ |
| r: r, |
| n: n, |
| } |
| } |
| |
| type limitedBufferReader struct { |
| r io.Reader |
| n int |
| } |
| |
| func (r *limitedBufferReader) Read(p []byte) (n int, err error) { |
| np := p |
| if len(np) > r.n { |
| np = np[:r.n] |
| } |
| return r.r.Read(np) |
| } |
