The type definition above should read:
type whenceReader struct {
r io.ReaderAt
off int64
}
(I forgot to put the package name (i.e., "io." in front of ReaderAt.)
On Sunday, December 8, 2019 at 6:19:04 PM UTC-5, William Hanisch wrote:
>
> Suppose you (okay, okay, I) want something like an io.SectionReader but
> don't want to specify the end point of the section, just the start. That
> is, method calls to Read should only return EOF when at the end of the
> underlying source of the initially supplied io.ReaderAt. This can be
> achieved, I suppose, by using an io.SectionReader with n set to the maximum
> value of an int64. Is this often done? Or (assuming here that only the
> Read method is needed) should I simply create something like:
>
> func newWhenceReader(r io.ReaderAt, off int64) io.Reader {
> return &whenceReader{r, off}
> }
>
> type whenceReader struct {
> r ReaderAt
> off int64
> }
>
> // I would otherwise use 'w' (for whence) for the receiver,
> // but it feels funny using 'w' for something that reads.
> func (r *whenceReader) Read(p []byte) (n int, err error) {
> n, err = r.r.ReadAt(p, r.off)
> r.off += int64(n)
> return
> }
>
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