http: make NewChunkedReader public

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4634112

src/pkg/http/chunked.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"os"
 	"strconv"
+	"bufio"
 )
 
 // NewChunkedWriter returns a new writer that translates writes into HTTP
@@ -64,3 +65,13 @@ func (cw *chunkedWriter) Close() os.Error {
 	_, err := io.WriteString(cw.Wire, "0\r\n")
 	return err
 }
+
+// NewChunkedReader returns a new reader that translates the data read from r
+// out of HTTP "chunked" format before returning it. 
+// The reader returns os.EOF when the final 0-length chunk is read.
+//
+// NewChunkedReader is not needed by normal applications. The http package
+// automatically decodes chunking when reading response bodies.
+func NewChunkedReader(r *bufio.Reader) io.Reader {
+	return &chunkedReader{r: r}
+}

src/pkg/http/request.go

@@ -428,10 +428,6 @@ type chunkedReader struct {
 	err os.Error
 }
 
-func newChunkedReader(r *bufio.Reader) *chunkedReader {
-	return &chunkedReader{r: r}
-}
-
 func (cr *chunkedReader) beginChunk() {
 	// chunk-size CRLF
 	var line string

src/pkg/http/transfer.go

@@ -279,7 +279,7 @@ func readTransfer(msg interface{}, r *bufio.Reader) (err os.Error) {
 	// or close connection when finished, since multipart is not supported yet
 	switch {
 	case chunked(t.TransferEncoding):
-		t.Body = &body{Reader: newChunkedReader(r), hdr: msg, r: r, closing: t.Close}
+		t.Body = &body{Reader: NewChunkedReader(r), hdr: msg, r: r, closing: t.Close}
 	case t.ContentLength >= 0:
 		// TODO: limit the Content-Length. This is an easy DoS vector.
 		t.Body = &body{Reader: io.LimitReader(r, t.ContentLength), closing: t.Close}