1 files changed, 76 insertions, 0 deletions
diff --git a/Source/WebCore/html/track/BufferedLineReader.h b/Source/WebCore/html/track/BufferedLineReader.h
new file mode 100644
index 000000000..9334ae73e
--- /dev/null
+++ b/Source/WebCore/html/track/BufferedLineReader.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2013, Opera Software ASA. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "SegmentedString.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+// Line collection helper for the WebVTT Parser.
+//
+// Converts a stream of data (== a sequence of Strings) into a set of
+// lines. CR, LR or CRLF are considered line breaks. Normalizes NULs (U+0000)
+// to 'REPLACEMENT CHARACTER' (U+FFFD) and does not return the line breaks as
+// part of the result.
+class BufferedLineReader {
+    WTF_MAKE_NONCOPYABLE(BufferedLineReader);
+public:
+    BufferedLineReader() = default;
+    void reset();
+
+    void append(String&& data)
+    {
+        ASSERT(!m_endOfStream);
+        m_buffer.append(WTFMove(data));
+    }
+
+    void appendEndOfStream() { m_endOfStream = true; }
+    bool isAtEndOfStream() const { return m_endOfStream && m_buffer.isEmpty(); }
+
+    std::optional<String> nextLine();
+
+private:
+    SegmentedString m_buffer;
+    StringBuilder m_lineBuffer;
+    bool m_endOfStream { false };
+    bool m_maybeSkipLF { false };
+};
+
+inline void BufferedLineReader::reset()
+{
+    m_buffer.clear();
+    m_lineBuffer.clear();
+    m_endOfStream = false;
+    m_maybeSkipLF = false;
+}
+
+} // namespace WebCore