| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package iomisc |
| |
| import ( |
| "io" |
| ) |
| |
| // readerAtAdapter wraps an io.ReaderAt and implements io.Reader. |
| type readerAtAdapter struct { |
| ra io.ReaderAt |
| offset int64 |
| } |
| |
| // Read reads bytes into b starting at the first unread byte. |
| func (r *readerAtAdapter) Read(b []byte) (int, error) { |
| n, err := r.ra.ReadAt(b, r.offset) |
| r.offset += int64(n) |
| return n, err |
| } |
| |
| // ReaderAtToReader creates a new Reader from a ReaderAt. |
| func ReaderAtToReader(r io.ReaderAt) io.Reader { |
| return &readerAtAdapter{ |
| ra: r, |
| offset: 0, |
| } |
| } |
