| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "fxjs/fx_date_helpers.h" |
| |
| #include <time.h> |
| |
| #include <cmath> |
| |
| #include "build/build_config.h" |
| #include "core/fxcrt/fx_extension.h" |
| #include "core/fxcrt/fx_system.h" |
| #include "fpdfsdk/cpdfsdk_helpers.h" |
| #include "third_party/base/cxx17_backports.h" |
| |
| namespace fxjs { |
| namespace { |
| |
| constexpr uint16_t daysMonth[12] = {0, 31, 59, 90, 120, 151, |
| 181, 212, 243, 273, 304, 334}; |
| constexpr uint16_t leapDaysMonth[12] = {0, 31, 60, 91, 121, 152, |
| 182, 213, 244, 274, 305, 335}; |
| |
| double Mod(double x, double y) { |
| double r = fmod(x, y); |
| if (r < 0) |
| r += y; |
| return r; |
| } |
| |
| double GetLocalTZA() { |
| if (!IsPDFSandboxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS)) |
| return 0; |
| time_t t = 0; |
| FXSYS_time(&t); |
| FXSYS_localtime(&t); |
| #if defined(OS_WIN) |
| // In gcc 'timezone' is a global variable declared in time.h. In VC++, that |
| // variable was removed in VC++ 2015, with _get_timezone replacing it. |
| long timezone = 0; |
| _get_timezone(&timezone); |
| #endif |
| return (double)(-(timezone * 1000)); |
| } |
| |
| int GetDaylightSavingTA(double d) { |
| if (!IsPDFSandboxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS)) |
| return 0; |
| time_t t = (time_t)(d / 1000); |
| struct tm* tmp = FXSYS_localtime(&t); |
| if (!tmp) |
| return 0; |
| if (tmp->tm_isdst > 0) |
| // One hour. |
| return (int)60 * 60 * 1000; |
| return 0; |
| } |
| |
| bool IsLeapYear(int year) { |
| return (year % 4 == 0) && ((year % 100 != 0) || (year % 400 != 0)); |
| } |
| |
| int DayFromYear(int y) { |
| return (int)(365 * (y - 1970.0) + floor((y - 1969.0) / 4) - |
| floor((y - 1901.0) / 100) + floor((y - 1601.0) / 400)); |
| } |
| |
| double TimeFromYear(int y) { |
| return 86400000.0 * DayFromYear(y); |
| } |
| |
| double TimeFromYearMonth(int y, int m) { |
| const uint16_t* pMonth = IsLeapYear(y) ? leapDaysMonth : daysMonth; |
| return TimeFromYear(y) + ((double)pMonth[m]) * 86400000; |
| } |
| |
| int Day(double t) { |
| return static_cast<int>(floor(t / 86400000.0)); |
| } |
| |
| int YearFromTime(double t) { |
| // estimate the time. |
| int y = 1970 + static_cast<int>(t / (365.2425 * 86400000.0)); |
| if (TimeFromYear(y) <= t) { |
| while (TimeFromYear(y + 1) <= t) |
| y++; |
| } else { |
| while (TimeFromYear(y) > t) |
| y--; |
| } |
| return y; |
| } |
| |
| int DayWithinYear(double t) { |
| int year = YearFromTime(t); |
| int day = Day(t); |
| return day - DayFromYear(year); |
| } |
| |
| int MonthFromTime(double t) { |
| // Check for negative |day| values and check for January. |
| int day = DayWithinYear(t); |
| if (day < 0) |
| return -1; |
| if (day < 31) |
| return 0; |
| |
| if (IsLeapYear(YearFromTime(t))) |
| --day; |
| |
| // Check for February onwards. |
| static constexpr int kCumulativeDaysInMonths[] = { |
| 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}; |
| for (size_t i = 0; i < pdfium::size(kCumulativeDaysInMonths); ++i) { |
| if (day < kCumulativeDaysInMonths[i]) |
| return i + 1; |
| } |
| |
| return -1; |
| } |
| |
| int DateFromTime(double t) { |
| int day = DayWithinYear(t); |
| int year = YearFromTime(t); |
| int leap = IsLeapYear(year); |
| int month = MonthFromTime(t); |
| switch (month) { |
| case 0: |
| return day + 1; |
| case 1: |
| return day - 30; |
| case 2: |
| return day - 58 - leap; |
| case 3: |
| return day - 89 - leap; |
| case 4: |
| return day - 119 - leap; |
| case 5: |
| return day - 150 - leap; |
| case 6: |
| return day - 180 - leap; |
| case 7: |
| return day - 211 - leap; |
| case 8: |
| return day - 242 - leap; |
| case 9: |
| return day - 272 - leap; |
| case 10: |
| return day - 303 - leap; |
| case 11: |
| return day - 333 - leap; |
| default: |
| return 0; |
| } |
| } |
| |
| size_t FindSubWordLength(const WideString& str, size_t nStart) { |
| pdfium::span<const wchar_t> data = str.span(); |
| size_t i = nStart; |
| while (i < data.size() && std::iswalnum(data[i])) |
| ++i; |
| return i - nStart; |
| } |
| |
| } // namespace |
| |
| const wchar_t* const kMonths[12] = {L"Jan", L"Feb", L"Mar", L"Apr", |
| L"May", L"Jun", L"Jul", L"Aug", |
| L"Sep", L"Oct", L"Nov", L"Dec"}; |
| |
| const wchar_t* const kFullMonths[12] = {L"January", L"February", L"March", |
| L"April", L"May", L"June", |
| L"July", L"August", L"September", |
| L"October", L"November", L"December"}; |
| |
| static constexpr size_t KMonthAbbreviationLength = 3; // Anything in |kMonths|. |
| static constexpr size_t kLongestFullMonthLength = 9; // September |
| |
| double FX_GetDateTime() { |
| if (!IsPDFSandboxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS)) |
| return 0; |
| |
| time_t t = FXSYS_time(nullptr); |
| struct tm* pTm = FXSYS_localtime(&t); |
| double t1 = TimeFromYear(pTm->tm_year + 1900); |
| return t1 + pTm->tm_yday * 86400000.0 + pTm->tm_hour * 3600000.0 + |
| pTm->tm_min * 60000.0 + pTm->tm_sec * 1000.0; |
| } |
| |
| int FX_GetYearFromTime(double dt) { |
| return YearFromTime(dt); |
| } |
| |
| int FX_GetMonthFromTime(double dt) { |
| return MonthFromTime(dt); |
| } |
| |
| int FX_GetDayFromTime(double dt) { |
| return DateFromTime(dt); |
| } |
| |
| int FX_GetHourFromTime(double dt) { |
| return (int)Mod(floor(dt / (60 * 60 * 1000)), 24); |
| } |
| |
| int FX_GetMinFromTime(double dt) { |
| return (int)Mod(floor(dt / (60 * 1000)), 60); |
| } |
| |
| int FX_GetSecFromTime(double dt) { |
| return (int)Mod(floor(dt / 1000), 60); |
| } |
| |
| bool FX_IsValidMonth(int m) { |
| return m >= 1 && m <= 12; |
| } |
| |
| // TODO(thestig): Should this take the month into consideration? |
| bool FX_IsValidDay(int d) { |
| return d >= 1 && d <= 31; |
| } |
| |
| // TODO(thestig): Should 24 be allowed? Similarly, 60 for minutes and seconds. |
| bool FX_IsValid24Hour(int h) { |
| return h >= 0 && h <= 24; |
| } |
| |
| bool FX_IsValidMinute(int m) { |
| return m >= 0 && m <= 60; |
| } |
| |
| bool FX_IsValidSecond(int s) { |
| return s >= 0 && s <= 60; |
| } |
| |
| double FX_LocalTime(double d) { |
| return d + GetLocalTZA() + GetDaylightSavingTA(d); |
| } |
| |
| double FX_MakeDay(int nYear, int nMonth, int nDate) { |
| double y = static_cast<double>(nYear); |
| double m = static_cast<double>(nMonth); |
| double dt = static_cast<double>(nDate); |
| double ym = y + floor(m / 12); |
| double mn = Mod(m, 12); |
| double t = TimeFromYearMonth(static_cast<int>(ym), static_cast<int>(mn)); |
| if (YearFromTime(t) != ym || MonthFromTime(t) != mn || DateFromTime(t) != 1) |
| return std::nan(""); |
| |
| return Day(t) + dt - 1; |
| } |
| |
| double FX_MakeTime(int nHour, int nMin, int nSec, int nMs) { |
| double h = static_cast<double>(nHour); |
| double m = static_cast<double>(nMin); |
| double s = static_cast<double>(nSec); |
| double milli = static_cast<double>(nMs); |
| return h * 3600000 + m * 60000 + s * 1000 + milli; |
| } |
| |
| double FX_MakeDate(double day, double time) { |
| if (!std::isfinite(day) || !std::isfinite(time)) |
| return std::nan(""); |
| |
| return day * 86400000 + time; |
| } |
| |
| int FX_ParseStringInteger(const WideString& str, |
| size_t nStart, |
| size_t* pSkip, |
| size_t nMaxStep) { |
| int nRet = 0; |
| size_t nSkip = 0; |
| for (size_t i = nStart; i < str.GetLength(); ++i) { |
| if (i - nStart > 10) |
| break; |
| |
| wchar_t c = str[i]; |
| if (!FXSYS_IsDecimalDigit(c)) |
| break; |
| |
| nRet = nRet * 10 + FXSYS_DecimalCharToInt(c); |
| ++nSkip; |
| if (nSkip >= nMaxStep) |
| break; |
| } |
| |
| *pSkip = nSkip; |
| return nRet; |
| } |
| |
| ConversionStatus FX_ParseDateUsingFormat(const WideString& value, |
| const WideString& format, |
| double* result) { |
| double dt = FX_GetDateTime(); |
| if (format.IsEmpty() || value.IsEmpty()) { |
| *result = dt; |
| return ConversionStatus::kSuccess; |
| } |
| |
| int nYear = FX_GetYearFromTime(dt); |
| int nMonth = FX_GetMonthFromTime(dt) + 1; |
| int nDay = FX_GetDayFromTime(dt); |
| int nHour = FX_GetHourFromTime(dt); |
| int nMin = FX_GetMinFromTime(dt); |
| int nSec = FX_GetSecFromTime(dt); |
| int nYearSub = 99; // nYear - 2000; |
| bool bPm = false; |
| bool bExit = false; |
| bool bBadFormat = false; |
| size_t i = 0; |
| size_t j = 0; |
| |
| while (i < format.GetLength()) { |
| if (bExit) |
| break; |
| |
| wchar_t c = format[i]; |
| switch (c) { |
| case ':': |
| case '.': |
| case '-': |
| case '\\': |
| case '/': |
| i++; |
| j++; |
| break; |
| |
| case 'y': |
| case 'm': |
| case 'd': |
| case 'H': |
| case 'h': |
| case 'M': |
| case 's': |
| case 't': { |
| size_t oldj = j; |
| size_t nSkip = 0; |
| size_t remaining = format.GetLength() - i - 1; |
| |
| if (remaining == 0 || format[i + 1] != c) { |
| switch (c) { |
| case 'y': |
| i++; |
| j++; |
| break; |
| case 'm': |
| nMonth = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 'd': |
| nDay = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 'H': |
| nHour = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 'h': |
| nHour = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 'M': |
| nMin = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 's': |
| nSec = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i++; |
| j += nSkip; |
| break; |
| case 't': |
| bPm = (j < value.GetLength() && value[j] == 'p'); |
| i++; |
| j++; |
| break; |
| } |
| } else if (remaining == 1 || format[i + 2] != c) { |
| switch (c) { |
| case 'y': |
| nYear = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 'm': |
| nMonth = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 'd': |
| nDay = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 'H': |
| nHour = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 'h': |
| nHour = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 'M': |
| nMin = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 's': |
| nSec = FX_ParseStringInteger(value, j, &nSkip, 2); |
| i += 2; |
| j += nSkip; |
| break; |
| case 't': |
| bPm = (j + 1 < value.GetLength() && value[j] == 'p' && |
| value[j + 1] == 'm'); |
| i += 2; |
| j += 2; |
| break; |
| } |
| } else if (remaining == 2 || format[i + 3] != c) { |
| switch (c) { |
| case 'm': { |
| bool bFind = false; |
| nSkip = FindSubWordLength(value, j); |
| if (nSkip == KMonthAbbreviationLength) { |
| WideString sMonth = value.Substr(j, KMonthAbbreviationLength); |
| for (size_t m = 0; m < pdfium::size(kMonths); ++m) { |
| if (sMonth.CompareNoCase(kMonths[m]) == 0) { |
| nMonth = m + 1; |
| i += 3; |
| j += nSkip; |
| bFind = true; |
| break; |
| } |
| } |
| } |
| |
| if (!bFind) { |
| nMonth = FX_ParseStringInteger(value, j, &nSkip, 3); |
| i += 3; |
| j += nSkip; |
| } |
| } break; |
| case 'y': |
| break; |
| default: |
| i += 3; |
| j += 3; |
| break; |
| } |
| } else if (remaining == 3 || format[i + 4] != c) { |
| switch (c) { |
| case 'y': |
| nYear = FX_ParseStringInteger(value, j, &nSkip, 4); |
| j += nSkip; |
| i += 4; |
| break; |
| case 'm': { |
| bool bFind = false; |
| nSkip = FindSubWordLength(value, j); |
| if (nSkip <= kLongestFullMonthLength) { |
| WideString sMonth = value.Substr(j, nSkip); |
| sMonth.MakeLower(); |
| for (size_t m = 0; m < pdfium::size(kFullMonths); ++m) { |
| WideString sFullMonths = WideString(kFullMonths[m]); |
| sFullMonths.MakeLower(); |
| if (sFullMonths.Contains(sMonth.c_str())) { |
| nMonth = m + 1; |
| i += 4; |
| j += nSkip; |
| bFind = true; |
| break; |
| } |
| } |
| } |
| |
| if (!bFind) { |
| nMonth = FX_ParseStringInteger(value, j, &nSkip, 4); |
| i += 4; |
| j += nSkip; |
| } |
| } break; |
| default: |
| i += 4; |
| j += 4; |
| break; |
| } |
| } else { |
| if (j >= value.GetLength() || format[i] != value[j]) { |
| bBadFormat = true; |
| bExit = true; |
| } |
| i++; |
| j++; |
| } |
| |
| if (oldj == j) { |
| bBadFormat = true; |
| bExit = true; |
| } |
| break; |
| } |
| |
| default: |
| if (value.GetLength() <= j) { |
| bExit = true; |
| } else if (format[i] != value[j]) { |
| bBadFormat = true; |
| bExit = true; |
| } |
| |
| i++; |
| j++; |
| break; |
| } |
| } |
| |
| if (bBadFormat) |
| return ConversionStatus::kBadFormat; |
| |
| if (bPm) |
| nHour += 12; |
| |
| if (nYear >= 0 && nYear <= nYearSub) |
| nYear += 2000; |
| |
| if (!FX_IsValidMonth(nMonth) || !FX_IsValidDay(nDay) || |
| !FX_IsValid24Hour(nHour) || !FX_IsValidMinute(nMin) || |
| !FX_IsValidSecond(nSec)) { |
| return ConversionStatus::kBadDate; |
| } |
| |
| dt = FX_MakeDate(FX_MakeDay(nYear, nMonth - 1, nDay), |
| FX_MakeTime(nHour, nMin, nSec, 0)); |
| if (std::isnan(dt)) |
| return ConversionStatus::kBadDate; |
| |
| *result = dt; |
| return ConversionStatus::kSuccess; |
| } |
| |
| } // namespace fxjs |