mirror of
https://github.com/rn10950/RetroZilla.git
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356 lines
10 KiB
C++
356 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TransforMiiX XSLT processor code.
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*
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* The Initial Developer of the Original Code is
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* The MITRE Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsString.h"
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#include "txCore.h"
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#include "XMLUtils.h"
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#include <math.h>
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#include <stdlib.h>
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#ifdef WIN32
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#include <float.h>
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#endif
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#include "prdtoa.h"
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/*
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* Utility class for doubles
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*/
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//A trick to handle IEEE floating point exceptions on FreeBSD - E.D.
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#ifdef __FreeBSD__
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#include <ieeefp.h>
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#ifdef __alpha__
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fp_except_t allmask = FP_X_INV|FP_X_OFL|FP_X_UFL|FP_X_DZ|FP_X_IMP;
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#else
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fp_except_t allmask = FP_X_INV|FP_X_OFL|FP_X_UFL|FP_X_DZ|FP_X_IMP|FP_X_DNML;
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#endif
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fp_except_t oldmask = fpsetmask(~allmask);
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#endif
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/**
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* Macros to workaround math-bugs bugs in various platforms
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*/
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/**
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* Stefan Hanske <sh990154@mail.uni-greifswald.de> reports:
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* ARM is a little endian architecture but 64 bit double words are stored
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* differently: the 32 bit words are in little endian byte order, the two words
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* are stored in big endian`s way.
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*/
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#if defined(__arm) || defined(__arm32__) || defined(_arm26__) || defined(__arm__)
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#define CPU_IS_ARM
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#endif
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#if (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || __GNUC__ > 2
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/**
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* This version of the macros is safe for the alias optimizations
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* that gcc does, but uses gcc-specific extensions.
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*/
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typedef union txdpun {
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PRFloat64 d;
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struct {
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#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
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PRUint32 lo, hi;
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#else
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PRUint32 hi, lo;
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#endif
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} s;
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} txdpun;
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#define TX_DOUBLE_HI32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.hi; }))
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#define TX_DOUBLE_LO32(x) (__extension__ ({ txdpun u; u.d = (x); u.s.lo; }))
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#else // __GNUC__
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/* We don't know of any non-gcc compilers that perform alias optimization,
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* so this code should work.
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*/
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#if defined(IS_LITTLE_ENDIAN) && !defined(CPU_IS_ARM)
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#define TX_DOUBLE_HI32(x) (((PRUint32 *)&(x))[1])
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#define TX_DOUBLE_LO32(x) (((PRUint32 *)&(x))[0])
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#else
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#define TX_DOUBLE_HI32(x) (((PRUint32 *)&(x))[0])
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#define TX_DOUBLE_LO32(x) (((PRUint32 *)&(x))[1])
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#endif
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#endif // __GNUC__
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#define TX_DOUBLE_HI32_SIGNBIT 0x80000000
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#define TX_DOUBLE_HI32_EXPMASK 0x7ff00000
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#define TX_DOUBLE_HI32_MANTMASK 0x000fffff
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//-- Initialize Double related constants
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#ifdef IS_BIG_ENDIAN
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const PRUint32 nanMask[2] = {TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK,
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0xffffffff};
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const PRUint32 infMask[2] = {TX_DOUBLE_HI32_EXPMASK, 0};
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const PRUint32 negInfMask[2] = {TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT, 0};
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#else
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const PRUint32 nanMask[2] = {0xffffffff,
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TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_MANTMASK};
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const PRUint32 infMask[2] = {0, TX_DOUBLE_HI32_EXPMASK};
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const PRUint32 negInfMask[2] = {0, TX_DOUBLE_HI32_EXPMASK | TX_DOUBLE_HI32_SIGNBIT};
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#endif
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const double Double::NaN = *((double*)nanMask);
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const double Double::POSITIVE_INFINITY = *((double*)infMask);
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const double Double::NEGATIVE_INFINITY = *((double*)negInfMask);
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/*
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* Determines whether the given double represents positive or negative
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* inifinity
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*/
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MBool Double::isInfinite(double aDbl)
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{
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return ((TX_DOUBLE_HI32(aDbl) & ~TX_DOUBLE_HI32_SIGNBIT) == TX_DOUBLE_HI32_EXPMASK &&
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!TX_DOUBLE_LO32(aDbl));
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}
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/*
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* Determines whether the given double is NaN
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*/
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MBool Double::isNaN(double aDbl)
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{
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return ((TX_DOUBLE_HI32(aDbl) & TX_DOUBLE_HI32_EXPMASK) == TX_DOUBLE_HI32_EXPMASK &&
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(TX_DOUBLE_LO32(aDbl) || (TX_DOUBLE_HI32(aDbl) & TX_DOUBLE_HI32_MANTMASK)));
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}
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/*
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* Determines whether the given double is negative
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*/
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MBool Double::isNeg(double aDbl)
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{
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return (TX_DOUBLE_HI32(aDbl) & TX_DOUBLE_HI32_SIGNBIT) != 0;
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}
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/*
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* Converts the given String to a double, if the String value does not
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* represent a double, NaN will be returned
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*/
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class txStringToDouble
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{
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public:
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typedef PRUnichar input_type;
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typedef PRUnichar value_type;
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txStringToDouble(): mState(eWhitestart), mSign(ePositive) {}
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PRUint32
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write(const input_type* aSource, PRUint32 aSourceLength)
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{
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if (mState == eIllegal) {
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return aSourceLength;
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}
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PRUint32 i = 0;
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PRUnichar c;
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for ( ; i < aSourceLength; ++i) {
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c = aSource[i];
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switch (mState) {
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case eWhitestart:
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if (c == '-') {
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mState = eDecimal;
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mSign = eNegative;
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}
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else if (c >= '0' && c <= '9') {
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mState = eDecimal;
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mBuffer.Append((char)c);
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}
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else if (c == '.') {
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mState = eMantissa;
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mBuffer.Append((char)c);
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}
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else if (!XMLUtils::isWhitespace(c)) {
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mState = eIllegal;
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return aSourceLength;
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}
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break;
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case eDecimal:
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if (c >= '0' && c <= '9') {
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mBuffer.Append((char)c);
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}
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else if (c == '.') {
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mState = eMantissa;
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mBuffer.Append((char)c);
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}
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else if (XMLUtils::isWhitespace(c)) {
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mState = eWhiteend;
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}
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else {
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mState = eIllegal;
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return aSourceLength;
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}
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break;
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case eMantissa:
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if (c >= '0' && c <= '9') {
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mBuffer.Append((char)c);
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}
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else if (XMLUtils::isWhitespace(c)) {
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mState = eWhiteend;
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}
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else {
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mState = eIllegal;
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return aSourceLength;
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}
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break;
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case eWhiteend:
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if (!XMLUtils::isWhitespace(c)) {
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mState = eIllegal;
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return aSourceLength;
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}
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break;
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default:
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break;
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}
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}
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return aSourceLength;
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}
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double
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getDouble()
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{
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if (mState == eIllegal || mBuffer.IsEmpty() ||
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(mBuffer.Length() == 1 && mBuffer[0] == '.')) {
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return Double::NaN;
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}
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return mSign*PR_strtod(mBuffer.get(), 0);
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}
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private:
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nsCAutoString mBuffer;
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enum {
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eWhitestart,
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eDecimal,
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eMantissa,
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eWhiteend,
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eIllegal
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} mState;
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enum {
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eNegative = -1,
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ePositive = 1
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} mSign;
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};
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double Double::toDouble(const nsAString& aSrc)
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{
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txStringToDouble sink;
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nsAString::const_iterator fromBegin, fromEnd;
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copy_string(aSrc.BeginReading(fromBegin), aSrc.EndReading(fromEnd), sink);
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return sink.getDouble();
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}
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/*
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* Converts the value of the given double to a String, and places
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* The result into the destination String.
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* @return the given dest string
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*/
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void Double::toString(double aValue, nsAString& aDest)
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{
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// check for special cases
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if (isNaN(aValue)) {
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aDest.AppendLiteral("NaN");
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return;
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}
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if (isInfinite(aValue)) {
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if (aValue < 0)
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aDest.Append(PRUnichar('-'));
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aDest.AppendLiteral("Infinity");
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return;
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}
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// Mantissa length is 17, so this is plenty
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const int buflen = 20;
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char buf[buflen];
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PRIntn intDigits, sign;
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char* endp;
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PR_dtoa(aValue, 0, 0, &intDigits, &sign, &endp, buf, buflen - 1);
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// compute length
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PRInt32 length = endp - buf;
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if (length > intDigits) {
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// decimal point needed
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++length;
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if (intDigits < 1) {
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// leading zeros, -intDigits + 1
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length += 1 - intDigits;
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}
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}
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else {
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// trailing zeros, total length given by intDigits
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length = intDigits;
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}
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if (aValue < 0)
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++length;
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// grow the string
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PRUint32 oldlength = aDest.Length();
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if (!EnsureStringLength(aDest, oldlength + length))
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return; // out of memory
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nsAString::iterator dest;
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aDest.BeginWriting(dest).advance(PRInt32(oldlength));
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if (aValue < 0) {
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*dest = '-'; ++dest;
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}
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int i;
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// leading zeros
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if (intDigits < 1) {
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*dest = '0'; ++dest;
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*dest = '.'; ++dest;
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for (i = 0; i > intDigits; --i) {
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*dest = '0'; ++dest;
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}
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}
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// mantissa
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int firstlen = PR_MIN(intDigits, endp - buf);
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for (i = 0; i < firstlen; i++) {
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*dest = buf[i]; ++dest;
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}
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if (i < endp - buf) {
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if (i > 0) {
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*dest = '.'; ++dest;
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}
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for (; i < endp - buf; i++) {
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*dest = buf[i]; ++dest;
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}
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}
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// trailing zeros
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for (; i < intDigits; i++) {
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*dest = '0'; ++dest;
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}
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}
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