github.com/uber/kraken@v0.1.4/lib/torrent/storage/piecereader/buffer.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package piecereader
    15  
    16  import "bytes"
    17  
    18  // Buffer is a storage.PieceReader which reads a piece from an in-memory buffer.
    19  type Buffer struct {
    20  	reader *bytes.Reader
    21  }
    22  
    23  // NewBuffer returns a new Buffer for b.
    24  func NewBuffer(b []byte) *Buffer {
    25  	return &Buffer{bytes.NewReader(b)}
    26  }
    27  
    28  // Read reads a piece into p.
    29  func (b *Buffer) Read(p []byte) (int, error) {
    30  	return b.reader.Read(p)
    31  }
    32  
    33  // Close noops.
    34  func (b *Buffer) Close() error {
    35  	return nil
    36  }
    37  
    38  // Length returns the length of the piece.
    39  func (b *Buffer) Length() int {
    40  	return b.reader.Len()
    41  }