br.Close()
				}
				p.readers[i] = nil

				// Since ReadAt returned error, trigger another read.
				readTriggerCh <- true
				return
			}
			newBufLK.Lock()
			newBuf[bufIdx] = p.buf[bufIdx][:n]
			newBufLK.Unlock()
			// Since ReadAt returned success, there is no need to trigger another read.
			readTriggerCh <- false
		}(readerIndex)
		readerIndex++
	}
	wg.Wait()

		bw.Close()
	}

	reader := newBitrotReader(disk, nil, volume, filePath, 35, bitrotAlgo, bitrotWriterSum(writer), 10)
	b := make([]byte, 10)
	if _, err = reader.ReadAt(b, 0); err != nil {
		t.Fatal(err)
	}
	if _, err = reader.ReadAt(b, 10); err != nil {
		t.Fatal(err)
	}
	if _, err = reader.ReadAt(b, 20); err != nil {
		t.Fatal(err)
	}
	if _, err = reader.ReadAt(b[:5], 30); err != nil {
		t.Fatal(err)
	}

		// drain the body for connection reuse at network layer.
		xhttp.DrainBody(struct {
			io.Reader
			io.Closer
		}{
			Reader: b.rc,
			Closer: closeWrapper(func() error { return nil }),
		})
		return closer.Close()
	}
	return nil
}

func (b *streamingBitrotReader) ReadAt(buf []byte, offset int64) (int, error) {
	var err error
	if offset%b.shardSize != 0 {

// ReadAt blocks until either all the data is available or an error occurs.
// In this respect ReadAt is different from Read.
//
// If the n = len(p) bytes returned by ReadAt are at the end of the
// input source, ReadAt may return either err == EOF or err == nil.
//
// If ReadAt is reading from an input source with a seek offset,
// ReadAt should not affect nor be affected by the underlying

			err = machoUpdateLoadCommand(reader, linkseg, linkoffset, &linkEditDataCmd{}, "DataOff")
		case LC_ENCRYPTION_INFO, LC_ENCRYPTION_INFO_64:
			err = machoUpdateLoadCommand(reader, linkseg, linkoffset, &encryptionInfoCmd{}, "CryptOff")
		case LC_UUID:
			var u uuidCmd
			err = reader.ReadAt(0, &u)
			if err == nil {
				copy(u.Uuid[:], uuidFromGoBuildId(*flagBuildid))
				err = reader.WriteAt(0, &u)
			}

		if sect != nil {
			bits := ptrdata / int64(ctxt.Arch.PtrSize)
			r := make([]byte, (bits+7)/8)
			// ldshlibsyms avoids closing the ELF file so sect.ReadAt works.
			// If we remove this read (and the ones in decodetypeGcprog), we
			// can close the file.
			_, err := sect.ReadAt(r, int64(addr-sect.Addr))
			if err != nil {
				log.Fatal(err)
			}
			return r
		}
		Exitf("cannot find gcmask for %s", ctxt.loader.SymName(s))

	}
	return asString(s[n : n+int(v)])
}

// A reader reads sequential fields from a section of the index format.
type reader struct {
	d   *decoder
	pos int
}

// readAt returns a reader starting at the given position in d.
func (d *decoder) readAt(pos int) *reader {
	return &reader{d, pos}
}

// int reads the next int.
func (r *reader) int() int {
	i := r.d.intAt(r.pos)
	r.pos += 4

	filePath   string
	verifier   *BitrotVerifier // Holds the bit-rot info
	tillOffset int64           // Affects the length of data requested in disk.ReadFile depending on Read()'s offset
	buf        []byte          // Holds bit-rot verified data
}

func (b *wholeBitrotReader) ReadAt(buf []byte, offset int64) (n int, err error) {
	if b.buf == nil {
		b.buf = make([]byte, b.tillOffset-offset)

			if err := reader.ReadAt(0, &u); err != nil {
				return err
			}
			copy(u.Uuid[:], uuidFromGoBuildId(*flagBuildid))
			if err := reader.WriteAt(0, &u); err != nil {
				return err
			}
			break
		}
	}

	// We're done
	return nil

}

type nobitsSectionReader struct{}

func (*nobitsSectionReader) ReadAt(p []byte, off int64) (n int, err error) {
	return 0, errors.New("unexpected read from section with uninitialized data")
}

// Data reads and returns the contents of the XCOFF section s.
func (s *Section) Data() ([]byte, error) {
	dat := make([]byte, s.sr.Size())
	n, err := s.sr.ReadAt(dat, 0)
	if n == len(dat) {
		err = nil
	}
	return dat[:n], err