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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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of Opera Software ASA 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 HOLDER 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 "core/html/track/vtt/VTTScanner.h"
namespace WebCore {
VTTScanner::VTTScanner(const String& line) : m_is8Bit(line.is8Bit())
{
if (m_is8Bit) {
m_data.characters8 = line.characters8();
m_end.characters8 = m_data.characters8 + line.length();
} else {
m_data.characters16 = line.characters16();
m_end.characters16 = m_data.characters16 + line.length();
}
}
bool VTTScanner::scan(char c)
{
if (!match(c))
return false;
advance();
return true;
}
bool VTTScanner::scan(const LChar* characters, size_t charactersCount)
{
unsigned matchLength = m_is8Bit ? m_end.characters8 - m_data.characters8 : m_end.characters16 - m_data.characters16;
if (matchLength < charactersCount)
return false;
bool matched;
if (m_is8Bit)
matched = WTF::equal(m_data.characters8, characters, charactersCount);
else
matched = WTF::equal(m_data.characters16, characters, charactersCount);
if (matched)
advance(charactersCount);
return matched;
}
bool VTTScanner::scanRun(const Run& run, const String& toMatch)
{
ASSERT(run.start() == position());
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
size_t matchLength = run.length();
if (toMatch.length() > matchLength)
return false;
bool matched;
if (m_is8Bit)
matched = WTF::equal(toMatch.impl(), m_data.characters8, matchLength);
else
matched = WTF::equal(toMatch.impl(), m_data.characters16, matchLength);
if (matched)
seekTo(run.end());
return matched;
}
void VTTScanner::skipRun(const Run& run)
{
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
seekTo(run.end());
}
String VTTScanner::extractString(const Run& run)
{
ASSERT(run.start() == position());
ASSERT(run.start() <= end());
ASSERT(run.end() >= run.start());
ASSERT(run.end() <= end());
String s;
if (m_is8Bit)
s = String(m_data.characters8, run.length());
else
s = String(m_data.characters16, run.length());
seekTo(run.end());
return s;
}
String VTTScanner::restOfInputAsString()
{
Run rest(position(), end(), m_is8Bit);
return extractString(rest);
}
unsigned VTTScanner::scanDigits(int& number)
{
Run runOfDigits = collectWhile<isASCIIDigit>();
if (runOfDigits.isEmpty()) {
number = 0;
return 0;
}
bool validNumber;
size_t numDigits = runOfDigits.length();
if (m_is8Bit)
number = charactersToInt(m_data.characters8, numDigits, &validNumber);
else
number = charactersToInt(m_data.characters16, numDigits, &validNumber);
// Since we know that scanDigits only scanned valid (ASCII) digits (and
// hence that's what got passed to charactersToInt()), the remaining
// failure mode for charactersToInt() is overflow, so if |validNumber| is
// not true, then set |number| to the maximum int value.
if (!validNumber)
number = std::numeric_limits<int>::max();
// Consume the digits.
seekTo(runOfDigits.end());
return numDigits;
}
bool VTTScanner::scanFloat(float& number)
{
Run integerRun = collectWhile<isASCIIDigit>();
seekTo(integerRun.end());
Run decimalRun(position(), position(), m_is8Bit);
if (scan('.')) {
decimalRun = collectWhile<isASCIIDigit>();
seekTo(decimalRun.end());
}
// At least one digit required.
if (integerRun.isEmpty() && decimalRun.isEmpty()) {
// Restore to starting position.
seekTo(integerRun.start());
return false;
}
size_t lengthOfFloat = Run(integerRun.start(), position(), m_is8Bit).length();
bool validNumber;
if (m_is8Bit)
number = charactersToFloat(integerRun.start(), lengthOfFloat, &validNumber);
else
number = charactersToFloat(reinterpret_cast<const UChar*>(integerRun.start()), lengthOfFloat, &validNumber);
if (!validNumber)
number = std::numeric_limits<float>::max();
return true;
}
}
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