net/spdy/hpack_entry.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/spdy/hpack_entry.h"
   6
   7 #include "base/logging.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "net/spdy/hpack_string_util.h"
  10
  11 namespace net {
  12
  13 namespace {
  14
  15 const uint32 kReferencedMask = 0x80000000;
  16 const uint32 kTouchCountMask = 0x7fffffff;
  17
  18 }  // namespace
  19
  20 const uint32 HpackEntry::kSizeOverhead = 32;
  21
  22 const uint32 HpackEntry::kUntouched = 0x7fffffff;
  23
  24 HpackEntry::HpackEntry() : referenced_and_touch_count_(kUntouched) {}
  25
  26 HpackEntry::HpackEntry(base::StringPiece name, base::StringPiece value)
  27     : name_(name.as_string()),
  28       value_(value.as_string()),
  29       referenced_and_touch_count_(kUntouched) {}
  30
  31 bool HpackEntry::IsReferenced() const {
  32   return ((referenced_and_touch_count_ & kReferencedMask) != 0);
  33 }
  34
  35 uint32 HpackEntry::TouchCount() const {
  36   return referenced_and_touch_count_ & kTouchCountMask;
  37 }
  38
  39 size_t HpackEntry::Size() const {
  40   return name_.size() + value_.size() + kSizeOverhead;
  41 }
  42
  43 std::string HpackEntry::GetDebugString() const {
  44   const char* is_referenced_str = (IsReferenced() ? "true" : "false");
  45   std::string touch_count_str = "(untouched)";
  46   if (TouchCount() != kUntouched)
  47     touch_count_str = base::IntToString(TouchCount());
  48   return "{ name: \"" + name_ + "\", value: \"" + value_ +
  49       "\", referenced: " + is_referenced_str + ", touch_count: " +
  50       touch_count_str + " }";
  51 }
  52
  53 bool HpackEntry::Equals(const HpackEntry& other) const {
  54   return
  55       StringPiecesEqualConstantTime(name_, other.name_) &&
  56       StringPiecesEqualConstantTime(value_, other.value_) &&
  57       (referenced_and_touch_count_ == other.referenced_and_touch_count_);
  58 }
  59
  60 void HpackEntry::SetReferenced(bool referenced) {
  61   referenced_and_touch_count_ &= kTouchCountMask;
  62   if (referenced)
  63     referenced_and_touch_count_ |= kReferencedMask;
  64 }
  65
  66 void HpackEntry::AddTouches(uint32 additional_touch_count) {
  67   uint32 new_touch_count = TouchCount();
  68   if (new_touch_count == kUntouched)
  69     new_touch_count = 0;
  70   new_touch_count += additional_touch_count;
  71   DCHECK_LT(new_touch_count, kUntouched);
  72   referenced_and_touch_count_ &= kReferencedMask;
  73   referenced_and_touch_count_ |= new_touch_count;
  74 }
  75
  76 void HpackEntry::ClearTouches() {
  77   referenced_and_touch_count_ &= kReferencedMask;
  78   referenced_and_touch_count_ |= kUntouched;
  79 }
  80
  81 }  // namespace net