Factor out chunk encoding logic into HttpStreamParser::EncodeChunk().

net/http/http_stream_parser.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_STREAM_PARSER_H_
 #define NET_HTTP_HTTP_STREAM_PARSER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/string_piece.h"
 #include "net/base/completion_callback.h"
+#include "net/base/net_export.h"
 #include "net/base/net_log.h"
 #include "net/base/upload_data_stream.h"
 #include "net/http/http_chunked_decoder.h"
 
 namespace net {
 
 class ClientSocketHandle;
 class DrainableIOBuffer;
 class GrowableIOBuffer;
 struct HttpRequestInfo;
 class HttpRequestHeaders;
 class HttpResponseInfo;
 class IOBuffer;
 class SSLCertRequestInfo;
 class SSLInfo;
 
-class HttpStreamParser  : public ChunkCallback {
+class NET_EXPORT_PRIVATE HttpStreamParser  : public ChunkCallback {
  public:
   // Any data in |read_buffer| will be used before reading from the socket
   // and any data left over after parsing the stream will be put into
   // |read_buffer|.  The left over data will start at offset 0 and the
   // buffer's offset will be set to the first free byte. |read_buffer| may
   // have its capacity changed.
   HttpStreamParser(ClientSocketHandle* connection,
                    const HttpRequestInfo* request,
                    GrowableIOBuffer* read_buffer,
                    const BoundNetLog& net_log);
@@ skipping 30 matching lines @@
 
   bool IsConnectionReusable() const;
 
   void GetSSLInfo(SSLInfo* ssl_info);
 
   void GetSSLCertRequestInfo(SSLCertRequestInfo* cert_request_info);
 
   // ChunkCallback methods.
   virtual void OnChunkAvailable() OVERRIDE;
 
+  // Encodes the given |payload| in the chunked format to |output|.
+  // Returns the number of bytes written to |output|. |output_size| should
+  // be large enough to store the encoded chunk, which is payload.size() +
+  // kChunkHeaderFooterSize. Returns ERR_INVALID_ARGUMENT if |output_size|
+  // is not large enough.
+  //
+  // The output will look like: "HEX\r\n[payload]\r\n"
+  // where HEX is a length in hexdecimal (without the "0x" prefix).
+  static int EncodeChunk(const base::StringPiece& payload,
+                         char* output,
+                         size_t output_size);
+
+  // The number of extra bytes required to encode a chunk.
+  static const size_t kChunkHeaderFooterSize;
+
  private:
   // FOO_COMPLETE states implement the second half of potentially asynchronous
   // operations and don't necessarily mean that FOO is complete.
   enum State {
     STATE_NONE,
     STATE_SENDING_HEADERS,
     STATE_SENDING_BODY,
     STATE_REQUEST_SENT,
     STATE_READ_HEADERS,
     STATE_READ_HEADERS_COMPLETE,
@@ skipping 108 matching lines @@
   size_t chunk_length_;
   size_t chunk_length_without_encoding_;
   bool sent_last_chunk_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamParser);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_PARSER_H_