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| 1 /* |
| 2 * Copyright (C) 2013, Opera Software ASA. All rights reserved. |
| 3 * |
| 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are |
| 6 * met: |
| 7 * |
| 8 * * Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. |
| 10 * * Redistributions in binary form must reproduce the above |
| 11 * copyright notice, this list of conditions and the following disclaimer |
| 12 * in the documentation and/or other materials provided with the |
| 13 * distribution. |
| 14 * * Neither the name of Google Inc. nor the names of its |
| 15 * contributors may be used to endorse or promote products derived from |
| 16 * this software without specific prior written permission. |
| 17 * |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 */ |
| 30 |
| 31 #include "config.h" |
| 32 #include "BufferedLineReader.h" |
| 33 |
| 34 #include "wtf/unicode/CharacterNames.h" |
| 35 |
| 36 namespace WebCore { |
| 37 |
| 38 bool BufferedLineReader::getLine(String& line) |
| 39 { |
| 40 if (m_maybeSkipLF) { |
| 41 // We ran out of data after a CR (U+000D), which means that we may be |
| 42 // in the middle of a CRLF pair. If the next character is a LF (U+000A) |
| 43 // then skip it, and then (unconditionally) return the buffered line. |
| 44 if (!m_buffer.isEmpty()) { |
| 45 scanCharacter(newlineCharacter); |
| 46 m_maybeSkipLF = false; |
| 47 } |
| 48 // If there was no (new) data available, then keep m_maybeSkipLF set, |
| 49 // and fall through all the way down to the EOS check at the end of |
| 50 // the method. |
| 51 } |
| 52 |
| 53 bool shouldReturnLine = false; |
| 54 bool checkForLF = false; |
| 55 while (!m_buffer.isEmpty()) { |
| 56 UChar c = m_buffer.currentChar(); |
| 57 m_buffer.advance(); |
| 58 |
| 59 if (c == newlineCharacter || c == carriageReturn) { |
| 60 // We found a line ending. Return the accumulated line. |
| 61 shouldReturnLine = true; |
| 62 checkForLF = (c == carriageReturn); |
| 63 break; |
| 64 } |
| 65 |
| 66 // NULs are transformed into U+FFFD (REPLACEMENT CHAR.) in step 1 of |
| 67 // the WebVTT parser algorithm. |
| 68 if (c == '\0') |
| 69 c = replacementCharacter; |
| 70 |
| 71 m_lineBuffer.append(c); |
| 72 } |
| 73 |
| 74 if (checkForLF) { |
| 75 // May be in the middle of a CRLF pair. |
| 76 if (!m_buffer.isEmpty()) { |
| 77 // Scan a potential newline character. |
| 78 scanCharacter(newlineCharacter); |
| 79 } else { |
| 80 // Check for the LF on the next call (unless we reached EOS, in |
| 81 // which case we'll return the contents of the line buffer, and |
| 82 // reset state for the next line.) |
| 83 m_maybeSkipLF = true; |
| 84 } |
| 85 } |
| 86 |
| 87 if (isAtEndOfStream()) { |
| 88 // We've reached the end of the stream proper. Emit a line if the |
| 89 // current line buffer is non-empty. (Note that if shouldReturnLine is |
| 90 // set already, we want to return a line nonetheless.) |
| 91 shouldReturnLine |= !m_lineBuffer.isEmpty(); |
| 92 } |
| 93 |
| 94 if (shouldReturnLine) { |
| 95 line = m_lineBuffer.toString(); |
| 96 m_lineBuffer.clear(); |
| 97 return true; |
| 98 } |
| 99 |
| 100 ASSERT(m_buffer.isEmpty()); |
| 101 return false; |
| 102 } |
| 103 |
| 104 } // namespace WebCore |
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