[SPDY] Refactor tests in preparation for a fix for a session flow control bug

net/spdy/spdy_test_util_spdy3.cc

 // Copyright (c) 2012 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.
 
 #include "net/spdy/spdy_test_util_spdy3.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 116 matching lines @@
 // |num_chunks| is the number of chunks to create.
 MockRead* ChopReadFrame(const SpdyFrame& frame, int num_chunks) {
   return ChopReadFrame(frame.data(), frame.size(), num_chunks);
 }
 
 // Adds headers and values to a map.
 // |extra_headers| is an array of { name, value } pairs, arranged as strings
 // where the even entries are the header names, and the odd entries are the
 // header values.
 // |headers| gets filled in from |extra_headers|.
-void AppendHeadersToSpdyFrame(const char* const extra_headers[],
-                              int extra_header_count,
-                              SpdyHeaderBlock* headers) {
+void AppendToHeaderBlock(const char* const extra_headers[],
+                         int extra_header_count,
+                         SpdyHeaderBlock* headers) {
   std::string this_header;
   std::string this_value;
 
   if (!extra_header_count)
     return;
 
   // Sanity check: Non-NULL header list.
   DCHECK(NULL != extra_headers) << "NULL header value pair list";
   // Sanity check: Non-NULL header map.
   DCHECK(NULL != headers) << "NULL header map";
@@ skipping 19 matching lines @@
       // Append the new value.
       new_value += this_value;
     } else {
       // Not a duplicate, just write the value.
       new_value = this_value;
     }
     (*headers)[this_header] = new_value;
   }
 }
 
+scoped_ptr<SpdyHeaderBlock> ConstructHeaderBlock(base::StringPiece url) {
+  std::string scheme, host, path;
+  ParseUrl(url.data(), &scheme, &host, &path);
+  const char* const headers[] = {
+    ":method",  "GET",
+    ":path",    path.c_str(),
+    ":host",    host.c_str(),
+    ":scheme",  scheme.c_str(),
+    ":version", "HTTP/1.1"
+  };
+  scoped_ptr<SpdyHeaderBlock> header_block(new SpdyHeaderBlock());
+  AppendToHeaderBlock(headers, arraysize(headers) / 2, header_block.get());
+  return header_block.Pass();
+}
+
 // Writes |val| to a location of size |len|, in big-endian format.
 // in the buffer pointed to by |buffer_handle|.
 // Updates the |*buffer_handle| pointer by |len|
 // Returns the number of bytes written
 int AppendToBuffer(int val,
                    int len,
                    unsigned char** buffer_handle,
                    int* buffer_len_remaining) {
   if (len <= 0)
     return 0;
   DCHECK((size_t) len <= sizeof(len)) << "Data length too long for data type";
   DCHECK(NULL != buffer_handle) << "NULL buffer handle";
   DCHECK(NULL != *buffer_handle) << "NULL pointer";
   DCHECK(NULL != buffer_len_remaining)
       << "NULL buffer remainder length pointer";
   DCHECK_GE(*buffer_len_remaining, len) << "Insufficient buffer size";
   for (int i = 0; i < len; i++) {
     int shift = (8 * (len - (i + 1)));
     unsigned char val_chunk = (val >> shift) & 0x0FF;
     *(*buffer_handle)++ = val_chunk;
     *buffer_len_remaining += 1;
   }
   return len;
 }
 
-// Construct a SPDY packet.
-// |head| is the start of the packet, up to but not including
-// the header value pairs.
-// |extra_headers| are the extra header-value pairs, which typically
-// will vary the most between calls.
-// |tail| is any (relatively constant) header-value pairs to add.
-// |buffer| is the buffer we're filling in.
-// Returns a SpdyFrame.
 SpdyFrame* ConstructSpdyPacket(const SpdyHeaderInfo& header_info,
-                               const char* const extra_headers[],
-                               int extra_header_count,
-                               const char* const tail[],
-                               int tail_header_count) {
-  BufferedSpdyFramer framer(3, header_info.compressed);
-  SpdyHeaderBlock headers;
-  // Copy in the extra headers to our map.
-  AppendHeadersToSpdyFrame(extra_headers, extra_header_count, &headers);
-  // Copy in the tail headers to our map.
-  if (tail && tail_header_count)
-    AppendHeadersToSpdyFrame(tail, tail_header_count, &headers);
+                               scoped_ptr<SpdyHeaderBlock> headers) {
+  BufferedSpdyFramer framer(kSpdyVersion3, header_info.compressed);
   SpdyFrame* frame = NULL;
   switch (header_info.kind) {
     case SYN_STREAM:
       frame = framer.CreateSynStream(header_info.id, header_info.assoc_id,
                                      header_info.priority,
                                      header_info.credential_slot,
                                      header_info.control_flags,
-                                     header_info.compressed, &headers);
+                                     header_info.compressed, headers.get());
       break;
     case SYN_REPLY:
       frame = framer.CreateSynReply(header_info.id, header_info.control_flags,
-                                    header_info.compressed, &headers);
+                                    header_info.compressed, headers.get());
       break;
     case RST_STREAM:
       frame = framer.CreateRstStream(header_info.id, header_info.status);
       break;
     case HEADERS:
       frame = framer.CreateHeaders(header_info.id, header_info.control_flags,
-                                   header_info.compressed, &headers);
+                                   header_info.compressed, headers.get());
       break;
     default:
       frame = framer.CreateDataFrame(header_info.id, header_info.data,
                                      header_info.data_length,
                                      header_info.data_flags);
       break;
   }
   return frame;
 }
 
+SpdyFrame* ConstructSpdyPacket(const SpdyHeaderInfo& header_info,
+                               const char* const extra_headers[],
+                               int extra_header_count,
+                               const char* const tail[],
+                               int tail_header_count) {
+  scoped_ptr<SpdyHeaderBlock> headers(new SpdyHeaderBlock());
+  AppendToHeaderBlock(extra_headers, extra_header_count, headers.get());
+  if (tail && tail_header_count)
+    AppendToHeaderBlock(tail, tail_header_count, headers.get());
+  return ConstructSpdyPacket(header_info, headers.Pass());
+}
+
 // Construct an expected SPDY SETTINGS frame.
 // |settings| are the settings to set.
 // Returns the constructed frame.  The caller takes ownership of the frame.
 SpdyFrame* ConstructSpdySettings(const SettingsMap& settings) {
   BufferedSpdyFramer framer(3, false);
   return framer.CreateSettings(settings);
 }
 
 // Construct an expected SPDY CREDENTIAL frame.
 // |credential| is the credential to sen.
@@ skipping 142 matching lines @@
     ConvertRequestPriorityToSpdyPriority(request_priority, 3),
                                   // Priority
     0,                            // Credential Slot
     CONTROL_FLAG_FIN,             // Control Flags
     compressed,                   // Compressed
     RST_STREAM_INVALID,           // Status
     NULL,                         // Data
     0,                            // Length
     DATA_FLAG_NONE                // Data Flags
   };
-
-  std::string scheme, host, path;
-  ParseUrl(url, &scheme, &host, &path);
-  const char* const headers[] = {
-    ":method", "GET",
-    ":path", path.c_str(),
-    ":host", host.c_str(),
-    ":scheme", scheme.c_str(),
-    ":version", "HTTP/1.1"
-  };
-  return ConstructSpdyPacket(
-      kSynStartHeader,
-      NULL,
-      0,
-      headers,
-      arraysize(headers) / 2);
+  return ConstructSpdyPacket(kSynStartHeader, ConstructHeaderBlock(url));
 }
 
 // Constructs a standard SPDY GET SYN packet, optionally compressed.
 // |extra_headers| are the extra header-value pairs, which typically
 // will vary the most between calls.
 // Returns a SpdyFrame.
 SpdyFrame* ConstructSpdyGet(const char* const extra_headers[],
                             int extra_header_count,
                             bool compressed,
                             int stream_id,
@@ skipping 326 matching lines @@
                              int extra_header_count,
                              char* buffer,
                              int buffer_length) {
   int packet_size = 0;
   char* buffer_write = buffer;
   int buffer_left = buffer_length;
   SpdyHeaderBlock headers;
   if (!buffer || !buffer_length)
     return 0;
   // Copy in the extra headers.
-  AppendHeadersToSpdyFrame(extra_headers, extra_header_count, &headers);
+  AppendToHeaderBlock(extra_headers, extra_header_count, &headers);
   // The iterator gets us the list of header/value pairs in sorted order.
   SpdyHeaderBlock::iterator next = headers.begin();
   SpdyHeaderBlock::iterator last = headers.end();
   for ( ; next != last; ++next) {
     // Write the header.
     int value_len, current_len, offset;
     const char* header_string = next->first.c_str();
     if (header_string && header_string[0] == ':')
       header_string++;
     packet_size += AppendToBuffer(header_string,
@@ skipping 236 matching lines @@
     NULL,                         // Data
     0,                            // Length
     DATA_FLAG_NONE          // Data Flags
   };
   return kHeader;
 }
 
 }  // namespace test_spdy3
 
 }  // namespace net