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/*
* Copyright (C) 2002, 2003 The Karbon Developers
* Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
* Copyright (C) 2006, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007-2018 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGParserUtilities.h"
#include "Document.h"
#include "FloatRect.h"
#include <limits>
#include <wtf/ASCIICType.h>
#include <wtf/text/StringView.h>
namespace WebCore {
template <typename FloatType> static inline bool isValidRange(const FloatType& x)
{
static const FloatType max = std::numeric_limits<FloatType>::max();
return x >= -max && x <= max;
}
// We use this generic parseNumber function to allow the Path parsing code to work
// at a higher precision internally, without any unnecessary runtime cost or code
// complexity.
template <typename CharacterType, typename FloatType> static bool genericParseNumber(const CharacterType*& ptr, const CharacterType* end, FloatType& number, bool skip)
{
FloatType integer, decimal, frac, exponent;
int sign, expsign;
const CharacterType* start = ptr;
exponent = 0;
integer = 0;
frac = 1;
decimal = 0;
sign = 1;
expsign = 1;
// read the sign
if (ptr < end && *ptr == '+')
ptr++;
else if (ptr < end && *ptr == '-') {
ptr++;
sign = -1;
}
if (ptr == end || (!isASCIIDigit(*ptr) && *ptr != '.'))
return false;
// read the integer part, build right-to-left
const CharacterType* ptrStartIntPart = ptr;
while (ptr < end && isASCIIDigit(*ptr))
++ptr; // Advance to first non-digit.
if (ptr != ptrStartIntPart) {
const CharacterType* ptrScanIntPart = ptr - 1;
FloatType multiplier = 1;
while (ptrScanIntPart >= ptrStartIntPart) {
integer += multiplier * static_cast<FloatType>(*(ptrScanIntPart--) - '0');
multiplier *= 10;
}
// Bail out early if this overflows.
if (!isValidRange(integer))
return false;
}
if (ptr < end && *ptr == '.') { // read the decimals
ptr++;
// There must be a least one digit following the .
if (ptr >= end || !isASCIIDigit(*ptr))
return false;
while (ptr < end && isASCIIDigit(*ptr))
decimal += (*(ptr++) - '0') * (frac *= static_cast<FloatType>(0.1));
}
// read the exponent part
if (ptr != start && ptr + 1 < end && (*ptr == 'e' || *ptr == 'E')
&& (ptr[1] != 'x' && ptr[1] != 'm')) {
ptr++;
// read the sign of the exponent
if (*ptr == '+')
ptr++;
else if (*ptr == '-') {
ptr++;
expsign = -1;
}
// There must be an exponent
if (ptr >= end || !isASCIIDigit(*ptr))
return false;
while (ptr < end && isASCIIDigit(*ptr)) {
exponent *= static_cast<FloatType>(10);
exponent += *ptr - '0';
ptr++;
}
// Make sure exponent is valid.
if (!isValidRange(exponent) || exponent > std::numeric_limits<FloatType>::max_exponent)
return false;
}
number = integer + decimal;
number *= sign;
if (exponent)
number *= static_cast<FloatType>(pow(10.0, expsign * static_cast<int>(exponent)));
// Don't return Infinity() or NaN().
if (!isValidRange(number))
return false;
if (start == ptr)
return false;
if (skip)
skipOptionalSVGSpacesOrDelimiter(ptr, end);
return true;
}
template <typename CharacterType>
bool parseSVGNumber(CharacterType* begin, size_t length, double& number)
{
const CharacterType* ptr = begin;
const CharacterType* end = ptr + length;
return genericParseNumber(ptr, end, number, false);
}
// Explicitly instantiate the two flavors of parseSVGNumber() to satisfy external callers
template bool parseSVGNumber(LChar* begin, size_t length, double&);
template bool parseSVGNumber(UChar* begin, size_t length, double&);
bool parseNumber(const LChar*& ptr, const LChar* end, float& number, bool skip)
{
return genericParseNumber(ptr, end, number, skip);
}
bool parseNumber(const UChar*& ptr, const UChar* end, float& number, bool skip)
{
return genericParseNumber(ptr, end, number, skip);
}
bool parseNumberFromString(const String& string, float& number, bool skip)
{
auto upconvertedCharacters = StringView(string).upconvertedCharacters();
const UChar* ptr = upconvertedCharacters;
const UChar* end = ptr + string.length();
return genericParseNumber(ptr, end, number, skip) && ptr == end;
}
// only used to parse largeArcFlag and sweepFlag which must be a "0" or "1"
// and might not have any whitespace/comma after it
template <typename CharacterType>
bool genericParseArcFlag(const CharacterType*& ptr, const CharacterType* end, bool& flag)
{
if (ptr >= end)
return false;
const CharacterType flagChar = *ptr++;
if (flagChar == '0')
flag = false;
else if (flagChar == '1')
flag = true;
else
return false;
skipOptionalSVGSpacesOrDelimiter(ptr, end);
return true;
}
bool parseArcFlag(const LChar*& ptr, const LChar* end, bool& flag)
{
return genericParseArcFlag(ptr, end, flag);
}
bool parseArcFlag(const UChar*& ptr, const UChar* end, bool& flag)
{
return genericParseArcFlag(ptr, end, flag);
}
bool parseNumberOptionalNumber(const String& s, float& x, float& y)
{
if (s.isEmpty())
return false;
auto upconvertedCharacters = StringView(s).upconvertedCharacters();
const UChar* cur = upconvertedCharacters;
const UChar* end = cur + s.length();
if (!parseNumber(cur, end, x))
return false;
if (cur == end)
y = x;
else if (!parseNumber(cur, end, y, false))
return false;
return cur == end;
}
bool parsePoint(const String& s, FloatPoint& point)
{
if (s.isEmpty())
return false;
auto upconvertedCharacters = StringView(s).upconvertedCharacters();
const UChar* cur = upconvertedCharacters;
const UChar* end = cur + s.length();
if (!skipOptionalSVGSpaces(cur, end))
return false;
float x = 0;
if (!parseNumber(cur, end, x))
return false;
float y = 0;
if (!parseNumber(cur, end, y))
return false;
point = FloatPoint(x, y);
// Disallow anything except spaces at the end.
return !skipOptionalSVGSpaces(cur, end);
}
bool parseRect(const String& string, FloatRect& rect)
{
auto upconvertedCharacters = StringView(string).upconvertedCharacters();
const UChar* ptr = upconvertedCharacters;
const UChar* end = ptr + string.length();
skipOptionalSVGSpaces(ptr, end);
float x = 0;
float y = 0;
float width = 0;
float height = 0;
bool valid = parseNumber(ptr, end, x) && parseNumber(ptr, end, y) && parseNumber(ptr, end, width) && parseNumber(ptr, end, height, false);
rect = FloatRect(x, y, width, height);
return valid;
}
bool parseGlyphName(const String& input, HashSet<String>& values)
{
// FIXME: Parsing error detection is missing.
values.clear();
auto upconvertedCharacters = StringView(input).upconvertedCharacters();
const UChar* ptr = upconvertedCharacters;
const UChar* end = ptr + input.length();
skipOptionalSVGSpaces(ptr, end);
while (ptr < end) {
// Leading and trailing white space, and white space before and after separators, will be ignored.
const UChar* inputStart = ptr;
while (ptr < end && *ptr != ',')
++ptr;
if (ptr == inputStart)
break;
// walk backwards from the ; to ignore any whitespace
const UChar* inputEnd = ptr - 1;
while (inputStart < inputEnd && isSVGSpace(*inputEnd))
--inputEnd;
values.add(String(inputStart, inputEnd - inputStart + 1));
skipOptionalSVGSpacesOrDelimiter(ptr, end, ',');
}
return true;
}
static bool parseUnicodeRange(const UChar* characters, unsigned length, UnicodeRange& range)
{
if (length < 2 || characters[0] != 'U' || characters[1] != '+')
return false;
// Parse the starting hex number (or its prefix).
unsigned startRange = 0;
unsigned startLength = 0;
const UChar* ptr = characters + 2;
const UChar* end = characters + length;
while (ptr < end) {
if (!isASCIIHexDigit(*ptr))
break;
++startLength;
if (startLength > 6)
return false;
startRange = (startRange << 4) | toASCIIHexValue(*ptr);
++ptr;
}
// Handle the case of ranges separated by "-" sign.
if (2 + startLength < length && *ptr == '-') {
if (!startLength)
return false;
// Parse the ending hex number (or its prefix).
unsigned endRange = 0;
unsigned endLength = 0;
++ptr;
while (ptr < end) {
if (!isASCIIHexDigit(*ptr))
break;
++endLength;
if (endLength > 6)
return false;
endRange = (endRange << 4) | toASCIIHexValue(*ptr);
++ptr;
}
if (!endLength)
return false;
range.first = startRange;
range.second = endRange;
return true;
}
// Handle the case of a number with some optional trailing question marks.
unsigned endRange = startRange;
while (ptr < end) {
if (*ptr != '?')
break;
++startLength;
if (startLength > 6)
return false;
startRange <<= 4;
endRange = (endRange << 4) | 0xF;
++ptr;
}
if (!startLength)
return false;
range.first = startRange;
range.second = endRange;
return true;
}
bool parseKerningUnicodeString(const String& input, UnicodeRanges& rangeList, HashSet<String>& stringList)
{
// FIXME: Parsing error detection is missing.
auto upconvertedCharacters = StringView(input).upconvertedCharacters();
const UChar* ptr = upconvertedCharacters;
const UChar* end = ptr + input.length();
while (ptr < end) {
const UChar* inputStart = ptr;
while (ptr < end && *ptr != ',')
++ptr;
if (ptr == inputStart)
break;
// Try to parse unicode range first
UnicodeRange range;
if (parseUnicodeRange(inputStart, ptr - inputStart, range))
rangeList.append(range);
else
stringList.add(String(inputStart, ptr - inputStart));
++ptr;
}
return true;
}
Vector<String> parseDelimitedString(const String& input, const char seperator)
{
Vector<String> values;
auto upconvertedCharacters = StringView(input).upconvertedCharacters();
const UChar* ptr = upconvertedCharacters;
const UChar* end = ptr + input.length();
skipOptionalSVGSpaces(ptr, end);
while (ptr < end) {
// Leading and trailing white space, and white space before and after semicolon separators, will be ignored.
const UChar* inputStart = ptr;
while (ptr < end && *ptr != seperator) // careful not to ignore whitespace inside inputs
ptr++;
if (ptr == inputStart)
break;
// walk backwards from the ; to ignore any whitespace
const UChar* inputEnd = ptr - 1;
while (inputStart < inputEnd && isSVGSpace(*inputEnd))
inputEnd--;
values.append(String(inputStart, inputEnd - inputStart + 1));
skipOptionalSVGSpacesOrDelimiter(ptr, end, seperator);
}
return values;
}
template <typename CharacterType>
bool parseFloatPoint(const CharacterType*& current, const CharacterType* end, FloatPoint& point)
{
float x;
float y;
if (!parseNumber(current, end, x)
|| !parseNumber(current, end, y))
return false;
point = FloatPoint(x, y);
return true;
}
template bool parseFloatPoint(const LChar*& current, const LChar* end, FloatPoint& point1);
template bool parseFloatPoint(const UChar*& current, const UChar* end, FloatPoint& point1);
template <typename CharacterType>
inline bool parseFloatPoint2(const CharacterType*& current, const CharacterType* end, FloatPoint& point1, FloatPoint& point2)
{
float x1;
float y1;
float x2;
float y2;
if (!parseNumber(current, end, x1)
|| !parseNumber(current, end, y1)
|| !parseNumber(current, end, x2)
|| !parseNumber(current, end, y2))
return false;
point1 = FloatPoint(x1, y1);
point2 = FloatPoint(x2, y2);
return true;
}
template bool parseFloatPoint2(const LChar*& current, const LChar* end, FloatPoint& point1, FloatPoint& point2);
template bool parseFloatPoint2(const UChar*& current, const UChar* end, FloatPoint& point1, FloatPoint& point2);
template <typename CharacterType>
bool parseFloatPoint3(const CharacterType*& current, const CharacterType* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3)
{
float x1;
float y1;
float x2;
float y2;
float x3;
float y3;
if (!parseNumber(current, end, x1)
|| !parseNumber(current, end, y1)
|| !parseNumber(current, end, x2)
|| !parseNumber(current, end, y2)
|| !parseNumber(current, end, x3)
|| !parseNumber(current, end, y3))
return false;
point1 = FloatPoint(x1, y1);
point2 = FloatPoint(x2, y2);
point3 = FloatPoint(x3, y3);
return true;
}
template bool parseFloatPoint3(const LChar*& current, const LChar* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3);
template bool parseFloatPoint3(const UChar*& current, const UChar* end, FloatPoint& point1, FloatPoint& point2, FloatPoint& point3);
}