Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/tools/http2_frame_builder.h

Index: net/http2/tools/http2_frame_builder.h
diff --git a/net/http2/tools/http2_frame_builder.h b/net/http2/tools/http2_frame_builder.h
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+// Copyright 2016 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_HTTP2_TOOLS_HTTP2_FRAME_BUILDER_H_
+#define NET_HTTP2_TOOLS_HTTP2_FRAME_BUILDER_H_
+
+// Http2FrameBuilder builds wire-format HTTP/2 frames (or fragments thereof)
+// from components.
+//
+// For now, this is only intended for use in tests, and thus has EXPECT* in the
+// code. If desired to use it in an encoder, it will need optimization work,
+// especially w.r.t memory mgmt, and the EXPECT* will need to be removed or
+// replaced with DCHECKs.
+
+#include <stddef.h>  // for size_t
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "net/http2/http2_constants.h"
+#include "net/http2/http2_structures.h"
+
+namespace net {
+namespace test {
+
+class Http2FrameBuilder {
+ public:
+  Http2FrameBuilder(Http2FrameType type, uint8_t flags, uint32_t stream_id);
+  explicit Http2FrameBuilder(const Http2FrameHeader& v);
+  Http2FrameBuilder() {}
+  ~Http2FrameBuilder() {}
+
+  size_t size() const { return buffer_.size(); }
+  const std::string& buffer() const { return buffer_; }
+
+  //----------------------------------------------------------------------------
+  // Methods for appending to the end of the buffer.
+
+  // Append a sequence of bytes from various sources.
+  void Append(base::StringPiece s);
+  void AppendBytes(const void* data, uint32_t num_bytes);
+
+  // Append an array of type T[N] to the string. Intended for tests with arrays
+  // initialized from literals, such as:
+  //    const char kData[] = {0x12, 0x23, ...};
+  //    builder.AppendBytes(kData);
+  template <typename T, size_t N>
+  void AppendBytes(T (&buf)[N]) {
+    AppendBytes(buf, N * sizeof(buf[0]));
+  }
+
+  // Support for appending padding. Does not read or write the Pad Length field.
+  void AppendZeroes(size_t num_zero_bytes);
+
+  // Append various sizes of unsigned integers.
+  void AppendUInt8(uint8_t value);
+  void AppendUInt16(uint16_t value);
+  void AppendUInt24(uint32_t value);
+  void AppendUInt31(uint32_t value);
+  void AppendUInt32(uint32_t value);
+
+  // Append various enums.
+  void Append(Http2ErrorCode error_code);
+  void Append(Http2FrameType type);
+  void Append(Http2SettingsParameter parameter);
+
+  // Append various structures.
+  void Append(const Http2FrameHeader& v);
+  void Append(const Http2PriorityFields& v);
+  void Append(const Http2RstStreamFields& v);
+  void Append(const Http2SettingFields& v);
+  void Append(const Http2PushPromiseFields& v);
+  void Append(const Http2PingFields& v);
+  void Append(const Http2GoAwayFields& v);
+  void Append(const Http2WindowUpdateFields& v);
+  void Append(const Http2AltSvcFields& v);
+
+  // Methods for changing existing buffer contents (mostly focused on updating
+  // the payload length).
+
+  void WriteAt(base::StringPiece s, size_t offset);
+  void WriteBytesAt(const void* data, uint32_t num_bytes, size_t offset);
+  void WriteUInt24At(uint32_t value, size_t offset);
+
+  // Set the payload length to the specified size.
+  void SetPayloadLength(uint32_t payload_length);
+
+  // Sets the payload length to the size of the buffer minus the size of
+  // the frame header.
+  size_t SetPayloadLength();
+
+ private:
+  std::string buffer_;
+};
+
+}  // namespace test
+}  // namespace net
+
+#endif  // NET_HTTP2_TOOLS_HTTP2_FRAME_BUILDER_H_