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

net/http2/hpack/decoder/hpack_block_decoder.cc

Index: net/http2/hpack/decoder/hpack_block_decoder.cc
diff --git a/net/http2/hpack/decoder/hpack_block_decoder.cc b/net/http2/hpack/decoder/hpack_block_decoder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..29b68691b1bbf940fa35021be8ef54bae8b80cbf
--- /dev/null
+++ b/net/http2/hpack/decoder/hpack_block_decoder.cc
@@ -0,0 +1,65 @@
+// 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.
+
+#include "net/http2/hpack/decoder/hpack_block_decoder.h"
+
+#include <stdint.h>
+
+#include <sstream>
+#include <string>
+
+#include "base/logging.h"
+
+namespace net {
+
+DecodeStatus HpackBlockDecoder::Decode(DecodeBuffer* db) {
+  if (!before_entry_) {
+    DVLOG(2) << "HpackBlockDecoder::Decode resume entry, db->Remaining="
+             << db->Remaining();
+    DecodeStatus status = entry_decoder_.Resume(db, listener_);
+    switch (status) {
+      case DecodeStatus::kDecodeDone:
+        before_entry_ = true;
+        break;
+      case DecodeStatus::kDecodeInProgress:
+        DCHECK_EQ(0u, db->Remaining());
+        return DecodeStatus::kDecodeInProgress;
+      case DecodeStatus::kDecodeError:
+        return DecodeStatus::kDecodeError;
+    }
+  }
+  DCHECK(before_entry_);
+  while (db->HasData()) {
+    DVLOG(2) << "HpackBlockDecoder::Decode start entry, db->Remaining="
+             << db->Remaining();
+    DecodeStatus status = entry_decoder_.Start(db, listener_);
+    switch (status) {
+      case DecodeStatus::kDecodeDone:
+        continue;
+      case DecodeStatus::kDecodeInProgress:
+        DCHECK_EQ(0u, db->Remaining());
+        before_entry_ = false;
+        return DecodeStatus::kDecodeInProgress;
+      case DecodeStatus::kDecodeError:
+        return DecodeStatus::kDecodeError;
+    }
+    DCHECK(false);
+  }
+  DCHECK(before_entry_);
+  return DecodeStatus::kDecodeDone;
+}
+
+std::string HpackBlockDecoder::DebugString() const {
+  std::stringstream ss;
+  ss << "HpackBlockDecoder(" << entry_decoder_.DebugString() << ", listener@"
+     << std::hex << reinterpret_cast<intptr_t>(listener_)
+     << (before_entry_ ? ", between entries)" : ", in an entry)");
+  return ss.str();
+}
+
+std::ostream& operator<<(std::ostream& out, const HpackBlockDecoder& v) {
+  return out << v.DebugString();
+}
+
+}  // namespace net