78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package http
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import (
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"bufio"
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"io"
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"log"
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"os"
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"strconv"
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)
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// NewChunkedWriter returns a new writer that translates writes into HTTP
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// "chunked" format before writing them to w. Closing the returned writer
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// sends the final 0-length chunk that marks the end of the stream.
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//
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// NewChunkedWriter is not needed by normal applications. The http
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// package adds chunking automatically if handlers don't set a
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// Content-Length header. Using NewChunkedWriter inside a handler
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// would result in double chunking or chunking with a Content-Length
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// length, both of which are wrong.
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func NewChunkedWriter(w io.Writer) io.WriteCloser {
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if _, bad := w.(*response); bad {
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log.Printf("warning: using NewChunkedWriter in an http.Handler; expect corrupt output")
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}
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return &chunkedWriter{w}
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}
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// Writing to ChunkedWriter translates to writing in HTTP chunked Transfer
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// Encoding wire format to the underlying Wire writer.
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type chunkedWriter struct {
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Wire io.Writer
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}
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// Write the contents of data as one chunk to Wire.
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// NOTE: Note that the corresponding chunk-writing procedure in Conn.Write has
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// a bug since it does not check for success of io.WriteString
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func (cw *chunkedWriter) Write(data []byte) (n int, err os.Error) {
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// Don't send 0-length data. It looks like EOF for chunked encoding.
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if len(data) == 0 {
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return 0, nil
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}
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head := strconv.Itob(len(data), 16) + "\r\n"
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if _, err = io.WriteString(cw.Wire, head); err != nil {
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return 0, err
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}
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if n, err = cw.Wire.Write(data); err != nil {
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return
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}
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if n != len(data) {
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err = io.ErrShortWrite
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return
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}
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_, err = io.WriteString(cw.Wire, "\r\n")
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return
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}
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func (cw *chunkedWriter) Close() os.Error {
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_, err := io.WriteString(cw.Wire, "0\r\n")
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return err
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}
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// NewChunkedReader returns a new reader that translates the data read from r
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// out of HTTP "chunked" format before returning it.
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// The reader returns os.EOF when the final 0-length chunk is read.
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//
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// NewChunkedReader is not needed by normal applications. The http package
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// automatically decodes chunking when reading response bodies.
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func NewChunkedReader(r *bufio.Reader) io.Reader {
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return &chunkedReader{r: r}
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}
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