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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 |
| 6 * are met: |
| 7 * 1. Redistributions of source code must retain the above copyright |
| 8 * notice, this list of conditions and the following disclaimer. |
| 9 * 2. Redistributions in binary form must reproduce the above copyright |
| 10 * notice, this list of conditions and the following disclaimer in the |
| 11 * documentation and/or other materials provided with the distribution. |
| 12 * 3. Neither the name of Opera Software ASA nor the names of its |
| 13 * contributors may be used to endorse or promote products derived |
| 14 * from this software without specific prior written permission. |
| 15 * |
| 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 27 * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 */ |
| 29 |
| 30 #include "config.h" |
| 31 #include "core/html/track/vtt/VTTScanner.h" |
| 32 |
| 33 namespace WebCore { |
| 34 |
| 35 VTTScanner::VTTScanner(const String& line) : m_is8Bit(line.is8Bit()) |
| 36 { |
| 37 if (m_is8Bit) { |
| 38 m_data.characters8 = line.characters8(); |
| 39 m_end.characters8 = m_data.characters8 + line.length(); |
| 40 } else { |
| 41 m_data.characters16 = line.characters16(); |
| 42 m_end.characters16 = m_data.characters16 + line.length(); |
| 43 } |
| 44 } |
| 45 |
| 46 bool VTTScanner::scan(char c) |
| 47 { |
| 48 if (!match(c)) |
| 49 return false; |
| 50 advance(); |
| 51 return true; |
| 52 } |
| 53 |
| 54 bool VTTScanner::scan(const LChar* characters, size_t charactersCount) |
| 55 { |
| 56 unsigned matchLength = m_is8Bit ? m_end.characters8 - m_data.characters8 : m
_end.characters16 - m_data.characters16; |
| 57 if (matchLength < charactersCount) |
| 58 return false; |
| 59 bool matched; |
| 60 if (m_is8Bit) |
| 61 matched = WTF::equal(m_data.characters8, characters, charactersCount); |
| 62 else |
| 63 matched = WTF::equal(m_data.characters16, characters, charactersCount); |
| 64 if (matched) |
| 65 advance(charactersCount); |
| 66 return matched; |
| 67 } |
| 68 |
| 69 String VTTScanner::restOfInputAsString() |
| 70 { |
| 71 ASSERT(position() <= end()); |
| 72 String s; |
| 73 if (m_is8Bit) |
| 74 s = String(m_data.characters8, m_end.characters8 - m_data.characters8); |
| 75 else |
| 76 s = String(m_data.characters16, m_end.characters16 - m_data.characters16
); |
| 77 seekTo(end()); |
| 78 return s; |
| 79 } |
| 80 |
| 81 unsigned VTTScanner::scanDigits(int& number) |
| 82 { |
| 83 Run runOfDigits = collectWhile<isASCIIDigit>(); |
| 84 if (runOfDigits.isEmpty()) { |
| 85 number = 0; |
| 86 return 0; |
| 87 } |
| 88 bool validNumber; |
| 89 size_t numDigits = runOfDigits.length(); |
| 90 if (m_is8Bit) |
| 91 number = charactersToInt(m_data.characters8, numDigits, &validNumber); |
| 92 else |
| 93 number = charactersToInt(m_data.characters16, numDigits, &validNumber); |
| 94 |
| 95 // Since we know that scanDigits only scanned valid (ASCII) digits (and |
| 96 // hence that's what got passed to charactersToInt()), the remaining |
| 97 // failure mode for charactersToInt() is overflow, so if |validNumber| is |
| 98 // not true, then set |number| to the maximum int value. |
| 99 if (!validNumber) |
| 100 number = std::numeric_limits<int>::max(); |
| 101 // Consume the digits. |
| 102 seekTo(runOfDigits.end()); |
| 103 return numDigits; |
| 104 } |
| 105 |
| 106 } |
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