Pull HTTP/2 header parsing into utility method, from QuicSpdy{Client,Server}Streams. Not used in pr…

net/quic/spdy_utils.cc

 // Copyright (c) 2013 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/quic/spdy_utils.h"
 
+#include <vector>
+
 #include "base/memory/scoped_ptr.h"
+#include "base/stl_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
 #include "net/spdy/spdy_frame_builder.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/spdy/spdy_protocol.h"
 
 using std::string;
+using std::vector;
 
 namespace net {
 
 // static
 string SpdyUtils::SerializeUncompressedHeaders(const SpdyHeaderBlock& headers) {
   SpdyMajorVersion spdy_version = HTTP2;
 
   size_t length = SpdyFramer::GetSerializedLength(spdy_version, &headers);
   SpdyFrameBuilder builder(length, spdy_version);
   SpdyFramer::WriteHeaderBlock(&builder, spdy_version, &headers);
   scoped_ptr<SpdyFrame> block(builder.take());
   return string(block->data(), length);
 }
 
+// static
+bool SpdyUtils::ParseHeaders(const char* data,
+                             uint32 data_len,
+                             int* content_length,
+                             SpdyHeaderBlock* headers) {
+  SpdyFramer framer(HTTP2);
+  if (!framer.ParseHeaderBlockInBuffer(data, data_len, headers) ||
+      headers->empty()) {
+    return false;  // Headers were invalid.
+  }
+
+  if (ContainsKey(*headers, "content-length")) {
+    // Check whether multiple values are consistent.
+    base::StringPiece content_length_header = (*headers)["content-length"];
+    vector<string> values =
+        base::SplitString(content_length_header, base::StringPiece("\0", 1),
+                          base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+    for (const string& value : values) {
+      int new_value;
+      if (!base::StringToInt(value, &new_value) || new_value < 0) {
+        return false;
+      }
+      if (*content_length < 0) {
+        *content_length = new_value;
+        continue;
+      }
+      if (new_value != *content_length) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
 }  // namespace net