1 files changed, 123 insertions, 0 deletions
diff --git a/netwerk/protocol/http/CacheControlParser.cpp b/netwerk/protocol/http/CacheControlParser.cpp
new file mode 100644
index 000000000..68c637706
--- /dev/null
+++ b/netwerk/protocol/http/CacheControlParser.cpp
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CacheControlParser.h"
+
+namespace mozilla {
+namespace net {
+
+CacheControlParser::CacheControlParser(nsACString const &aHeader)
+  : Tokenizer(aHeader, nullptr, "-_")
+  , mMaxAgeSet(false)
+  , mMaxAge(0)
+  , mMaxStaleSet(false)
+  , mMaxStale(0)
+  , mMinFreshSet(false)
+  , mMinFresh(0)
+  , mNoCache(false)
+  , mNoStore(false)
+{
+  SkipWhites();
+  if (!CheckEOF()) {
+    Directive();
+  }
+}
+
+void CacheControlParser::Directive()
+{
+  if (CheckWord("no-cache")) {
+    mNoCache = true;
+    IgnoreDirective(); // ignore any optionally added values
+  } else if (CheckWord("no-store")) {
+    mNoStore = true;
+  } else if (CheckWord("max-age")) {
+    mMaxAgeSet = SecondsValue(&mMaxAge);
+  } else if (CheckWord("max-stale")) {
+    mMaxStaleSet = SecondsValue(&mMaxStale, PR_UINT32_MAX);
+  } else if (CheckWord("min-fresh")) {
+    mMinFreshSet = SecondsValue(&mMinFresh);
+  } else {
+    IgnoreDirective();
+  }
+
+  SkipWhites();
+  if (CheckEOF()) {
+    return;
+  }
+  if (CheckChar(',')) {
+    SkipWhites();
+    Directive();
+    return;
+  }
+
+  NS_WARNING("Unexpected input in Cache-control header value");
+}
+
+bool CacheControlParser::SecondsValue(uint32_t *seconds, uint32_t defaultVal)
+{
+  SkipWhites();
+  if (!CheckChar('=')) {
+    *seconds = defaultVal;
+    return !!defaultVal;
+  }
+
+  SkipWhites();
+  if (!ReadInteger(seconds)) {
+    NS_WARNING("Unexpected value in Cache-control header value");
+    return false;
+  }
+
+  return true;
+}
+
+void CacheControlParser::IgnoreDirective()
+{
+  Token t;
+  while (Next(t)) {
+    if (t.Equals(Token::Char(',')) || t.Equals(Token::EndOfFile())) {
+      Rollback();
+      break;
+    }
+    if (t.Equals(Token::Char('"'))) {
+      SkipUntil(Token::Char('"'));
+      if (!CheckChar('"')) {
+        NS_WARNING("Missing quoted string expansion in Cache-control header value");
+        break;
+      }
+    }
+  }
+}
+
+bool CacheControlParser::MaxAge(uint32_t *seconds)
+{
+  *seconds = mMaxAge;
+  return mMaxAgeSet;
+}
+
+bool CacheControlParser::MaxStale(uint32_t *seconds)
+{
+  *seconds = mMaxStale;
+  return mMaxStaleSet;
+}
+
+bool CacheControlParser::MinFresh(uint32_t *seconds)
+{
+  *seconds = mMinFresh;
+  return mMinFreshSet;
+}
+
+bool CacheControlParser::NoCache()
+{
+  return mNoCache;
+}
+
+bool CacheControlParser::NoStore()
+{
+  return mNoStore;
+}
+
+} // net
+} // mozilla