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archive/tar: document how Reader.Read handles header-only files 

Commit dd5e14a7511465d20c6e95bf54c9b8f999abbbf6 ensured that no data
could be read for header-only files regardless of what the Header.Size
said. We should document this fact in Reader.Read.

Updates #13647

Change-Id: I4df9a2892bc66b49e0279693d08454bf696cfa31
Reviewed-on: https://go-review.googlesource.com/17913
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Joe Tsai 2015-12-16 23:10:14 -08:00 committed by Vincent Batts
parent 962540fec3
commit 10db8408f6
1 changed files with 4 additions and 0 deletions
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4
archive/tar/reader.go
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@ -928,6 +928,10 @@ func (tr *Reader) numBytes() int64 {
// Read reads from the current entry in the tar archive.
// It returns 0, io.EOF when it reaches the end of that entry,
// until Next is called to advance to the next entry.
//
// Calling Read on special types like TypeLink, TypeSymLink, TypeChar,
// TypeBlock, TypeDir, and TypeFifo returns 0, io.EOF regardless of what
// the Header.Size claims.
func (tr *Reader) Read(b []byte) (n int, err error) {
if tr.err != nil {
return 0, tr.err