Move definitions and methods related to QUIC versions, into quic_versions.{h,cc}. No behavior chang…

net/quic/core/quic_versions.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/quic/core/quic_versions.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "net/quic/core/quic_flags.h"
+#include "net/quic/core/quic_types.h"
+#include "net/quic/core/quic_utils.h"
+
+using base::StringPiece;
+using std::map;
+using std::numeric_limits;
+using std::ostream;
+using std::string;
+
+namespace net {
+
+QuicVersionVector AllSupportedVersions() {
+  QuicVersionVector supported_versions;
+  for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {
+    supported_versions.push_back(kSupportedQuicVersions[i]);
+  }
+  return supported_versions;
+}
+
+QuicVersionVector CurrentSupportedVersions() {
+  return FilterSupportedVersions(AllSupportedVersions());
+}
+
+QuicVersionVector FilterSupportedVersions(QuicVersionVector versions) {
+  QuicVersionVector filtered_versions(versions.size());
+  filtered_versions.clear();  // Guaranteed by spec not to change capacity.
+  for (QuicVersion version : versions) {
+    if (version < QUIC_VERSION_34) {
+      if (!FLAGS_quic_disable_pre_34) {
+        filtered_versions.push_back(version);
+      }
+    } else if (version == QUIC_VERSION_35) {
+      if (FLAGS_quic_enable_version_35) {
+        filtered_versions.push_back(version);
+      }
+    } else if (version == QUIC_VERSION_36) {
+      if (FLAGS_quic_enable_version_35 && FLAGS_quic_enable_version_36_v2) {
+        filtered_versions.push_back(version);
+      }
+    } else {
+      filtered_versions.push_back(version);
+    }
+  }
+  return filtered_versions;
+}
+
+QuicVersionVector VersionOfIndex(const QuicVersionVector& versions, int index) {
+  QuicVersionVector version;
+  int version_count = versions.size();
+  if (index >= 0 && index < version_count) {
+    version.push_back(versions[index]);
+  } else {
+    version.push_back(QUIC_VERSION_UNSUPPORTED);
+  }
+  return version;
+}
+
+QuicTag QuicVersionToQuicTag(const QuicVersion version) {
+  switch (version) {
+    case QUIC_VERSION_32:
+      return MakeQuicTag('Q', '0', '3', '2');
+    case QUIC_VERSION_33:
+      return MakeQuicTag('Q', '0', '3', '3');
+    case QUIC_VERSION_34:
+      return MakeQuicTag('Q', '0', '3', '4');
+    case QUIC_VERSION_35:
+      return MakeQuicTag('Q', '0', '3', '5');
+    case QUIC_VERSION_36:
+      return MakeQuicTag('Q', '0', '3', '6');
+    default:
+      // This shold be an ERROR because we should never attempt to convert an
+      // invalid QuicVersion to be written to the wire.
+      LOG(ERROR) << "Unsupported QuicVersion: " << version;
+      return 0;
+  }
+}
+
+QuicVersion QuicTagToQuicVersion(const QuicTag version_tag) {
+  for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {
+    if (version_tag == QuicVersionToQuicTag(kSupportedQuicVersions[i])) {
+      return kSupportedQuicVersions[i];
+    }
+  }
+  // Reading from the client so this should not be considered an ERROR.
+  DVLOG(1) << "Unsupported QuicTag version: "
+           << QuicUtils::TagToString(version_tag);
+  return QUIC_VERSION_UNSUPPORTED;
+}
+
+#define RETURN_STRING_LITERAL(x) \
+  case x:                        \
+    return #x
+
+string QuicVersionToString(const QuicVersion version) {
+  switch (version) {
+    RETURN_STRING_LITERAL(QUIC_VERSION_32);
+    RETURN_STRING_LITERAL(QUIC_VERSION_33);
+    RETURN_STRING_LITERAL(QUIC_VERSION_34);
+    RETURN_STRING_LITERAL(QUIC_VERSION_35);
+    RETURN_STRING_LITERAL(QUIC_VERSION_36);
+    default:
+      return "QUIC_VERSION_UNSUPPORTED";
+  }
+}
+
+string QuicVersionVectorToString(const QuicVersionVector& versions) {
+  string result = "";
+  for (size_t i = 0; i < versions.size(); ++i) {
+    if (i != 0) {
+      result.append(",");
+    }
+    result.append(QuicVersionToString(versions[i]));
+  }
+  return result;
+}
+
+}  // namespace net