1 files changed, 106 insertions, 0 deletions
diff --git a/netwerk/base/nsMediaFragmentURIParser.h b/netwerk/base/nsMediaFragmentURIParser.h
new file mode 100644
index 000000000..acfa1d5fe
--- /dev/null
+++ b/netwerk/base/nsMediaFragmentURIParser.h
@@ -0,0 +1,106 @@
+/* -*- 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; }
+
+  bool HasSampleSize() const { return mSampleSize.isSome(); }
+
+  int GetSampleSize() const { return *mSampleSize; }
+
+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);
+  bool ParseMozSampleSize(nsDependentSubstring aString);
+
+  // Media fragment information.
+  Maybe<double>    mStart;
+  Maybe<double>    mEnd;
+  Maybe<nsIntRect> mClip;
+  ClipUnit         mClipUnit;
+  Maybe<int>       mSampleSize;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif