1 files changed, 99 insertions, 0 deletions
diff --git a/netwerk/base/nsMediaFragmentURIParser.h b/netwerk/base/nsMediaFragmentURIParser.h
new file mode 100644
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+++ b/netwerk/base/nsMediaFragmentURIParser.h
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+#if !defined(nsMediaFragmentURIParser_h__)
+#  define nsMediaFragmentURIParser_h__
+
+#  include "mozilla/Maybe.h"
+#  include "nsStringFwd.h"
+#  include "nsRect.h"
+
+class nsIURI;
+
+// Class to handle parsing of a W3C media fragment URI as per
+// spec at: http://www.w3.org/TR/media-frags/
+// Only the temporaral URI portion of the spec is implemented.
+// To use:
+// a) Construct an instance with the URI containing the fragment
+// b) Check for the validity of the values you are interested in
+//    using e.g. HasStartTime().
+// c) If the values are valid, obtain them using e.g. GetStartTime().
+
+namespace mozilla {
+namespace net {
+
+enum ClipUnit {
+  eClipUnit_Pixel,
+  eClipUnit_Percent,
+};
+
+class nsMediaFragmentURIParser {
+ public:
+  // Create a parser with the provided URI.
+  explicit nsMediaFragmentURIParser(nsIURI* aURI);
+
+  // Create a parser with the provided URI reference portion.
+  explicit nsMediaFragmentURIParser(nsCString& aRef);
+
+  // True if a valid temporal media fragment indicated a start time.
+  bool HasStartTime() const { return mStart.isSome(); }
+
+  // If a valid temporal media fragment indicated a start time, returns
+  // it in units of seconds. If not, defaults to 0.
+  double GetStartTime() const { return *mStart; }
+
+  // True if a valid temporal media fragment indicated an end time.
+  bool HasEndTime() const { return mEnd.isSome(); }
+
+  // If a valid temporal media fragment indicated an end time, returns
+  // it in units of seconds. If not, defaults to -1.
+  double GetEndTime() const { return *mEnd; }
+
+  // True if a valid spatial media fragment indicated a clipping region.
+  bool HasClip() const { return mClip.isSome(); }
+
+  // If a valid spatial media fragment indicated a clipping region,
+  // returns the region. If not, returns an empty region. The unit
+  // used depends on the value returned by GetClipUnit().
+  nsIntRect GetClip() const { return *mClip; }
+
+  // If a valid spatial media fragment indicated a clipping region,
+  // returns the unit used.
+  ClipUnit GetClipUnit() const { return mClipUnit; }
+
+ private:
+  // Parse the URI ref provided, looking for media fragments. This is
+  // the top-level parser the invokes the others below.
+  void Parse(nsACString& aRef);
+
+  // The following methods parse the fragment as per the media
+  // fragments specification. 'aString' contains the remaining
+  // fragment data to be parsed. The method returns true
+  // if the parse was successful and leaves the remaining unparsed
+  // data in 'aString'. If the parse fails then false is returned
+  // and 'aString' is left as it was when called.
+  bool ParseNPT(nsDependentSubstring aString);
+  bool ParseNPTTime(nsDependentSubstring& aString, double& aTime);
+  bool ParseNPTSec(nsDependentSubstring& aString, double& aSec);
+  bool ParseNPTFraction(nsDependentSubstring& aString, double& aFraction);
+  bool ParseNPTMMSS(nsDependentSubstring& aString, double& aTime);
+  bool ParseNPTHHMMSS(nsDependentSubstring& aString, double& aTime);
+  bool ParseNPTHH(nsDependentSubstring& aString, uint32_t& aHour);
+  bool ParseNPTMM(nsDependentSubstring& aString, uint32_t& aMinute);
+  bool ParseNPTSS(nsDependentSubstring& aString, uint32_t& aSecond);
+  bool ParseXYWH(nsDependentSubstring aString);
+  bool ParseMozResolution(nsDependentSubstring aString);
+
+  // Media fragment information.
+  Maybe<double> mStart;
+  Maybe<double> mEnd;
+  Maybe<nsIntRect> mClip;
+  ClipUnit mClipUnit;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif