Index: Source/core/html/track/BufferedLineReader.cpp |
diff --git a/Source/core/html/track/BufferedLineReader.cpp b/Source/core/html/track/BufferedLineReader.cpp |
new file mode 100644 |
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+++ b/Source/core/html/track/BufferedLineReader.cpp |
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+/* |
+ * 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. |
+ */ |
+ |
+#include "config.h" |
+#include "BufferedLineReader.h" |
+ |
+#include "wtf/unicode/CharacterNames.h" |
+ |
+namespace WebCore { |
+ |
+bool BufferedLineReader::getLine(String& line) |
+{ |
+ if (m_maybeSkipLF) { |
+ // We ran out of data after a CR (U+000D), which means that we may be |
+ // in the middle of a CRLF pair. If the next character is a LF (U+000A) |
+ // then skip it, and then (unconditionally) return the buffered line. |
+ if (!m_buffer.isEmpty()) { |
+ scanCharacter(newlineCharacter); |
+ m_maybeSkipLF = false; |
+ } |
+ // If there was no (new) data available, then keep m_maybeSkipLF set, |
+ // and fall through all the way down to the EOS check at the end of |
+ // the method. |
+ } |
+ |
+ bool shouldReturnLine = false; |
+ bool checkForLF = false; |
+ while (!m_buffer.isEmpty()) { |
+ UChar c = m_buffer.currentChar(); |
+ m_buffer.advance(); |
+ |
+ if (c == newlineCharacter || c == carriageReturn) { |
+ // We found a line ending. Return the accumulated line. |
+ shouldReturnLine = true; |
+ checkForLF = (c == carriageReturn); |
+ break; |
+ } |
+ |
+ // NULs are transformed into U+FFFD (REPLACEMENT CHAR.) in step 1 of |
+ // the WebVTT parser algorithm. |
+ if (c == '\0') |
+ c = replacementCharacter; |
+ |
+ m_lineBuffer.append(c); |
+ } |
+ |
+ if (checkForLF) { |
+ // May be in the middle of a CRLF pair. |
+ if (!m_buffer.isEmpty()) { |
+ // Scan a potential newline character. |
+ scanCharacter(newlineCharacter); |
+ } else { |
+ // Check for the LF on the next call (unless we reached EOS, in |
+ // which case we'll return the contents of the line buffer, and |
+ // reset state for the next line.) |
+ m_maybeSkipLF = true; |
+ } |
+ } |
+ |
+ if (isAtEndOfStream()) { |
+ // We've reached the end of the stream proper. Emit a line if the |
+ // current line buffer is non-empty. (Note that if shouldReturnLine is |
+ // set already, we want to return a line nonetheless.) |
+ shouldReturnLine |= !m_lineBuffer.isEmpty(); |
+ } |
+ |
+ if (shouldReturnLine) { |
+ line = m_lineBuffer.toString(); |
+ m_lineBuffer.clear(); |
+ return true; |
+ } |
+ |
+ ASSERT(m_buffer.isEmpty()); |
+ return false; |
+} |
+ |
+} // namespace WebCore |