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+#include <google/protobuf/stubs/time.h>
+
+#include <ctime>
+
+#include <google/protobuf/stubs/stringprintf.h>
+#include <google/protobuf/stubs/strutil.h>
+
+namespace google {
+namespace protobuf {
+namespace internal {
+
+namespace {
+static const int64 kSecondsPerMinute = 60;
+static const int64 kSecondsPerHour = 3600;
+static const int64 kSecondsPerDay = kSecondsPerHour * 24;
+static const int64 kSecondsPer400Years =
+ kSecondsPerDay * (400 * 365 + 400 / 4 - 3);
+// Seconds from 0001-01-01T00:00:00 to 1970-01-01T:00:00:00
+static const int64 kSecondsFromEraToEpoch = 62135596800LL;
+// The range of timestamp values we support.
+static const int64 kMinTime = -62135596800LL; // 0001-01-01T00:00:00
+static const int64 kMaxTime = 253402300799LL; // 9999-12-31T23:59:59
+
+static const int kNanosPerMillisecond = 1000000;
+static const int kNanosPerMicrosecond = 1000;
+
+// Count the seconds from the given year (start at Jan 1, 00:00) to 100 years
+// after.
+int64 SecondsPer100Years(int year) {
+ if (year % 400 == 0 || year % 400 > 300) {
+ return kSecondsPerDay * (100 * 365 + 100 / 4);
+ } else {
+ return kSecondsPerDay * (100 * 365 + 100 / 4 - 1);
+ }
+}
+
+// Count the seconds from the given year (start at Jan 1, 00:00) to 4 years
+// after.
+int64 SecondsPer4Years(int year) {
+ if ((year % 100 == 0 || year % 100 > 96) &&
+ !(year % 400 == 0 || year % 400 > 396)) {
+ // No leap years.
+ return kSecondsPerDay * (4 * 365);
+ } else {
+ // One leap years.
+ return kSecondsPerDay * (4 * 365 + 1);
+ }
+}
+
+bool IsLeapYear(int year) {
+ return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
+}
+
+int64 SecondsPerYear(int year) {
+ return kSecondsPerDay * (IsLeapYear(year) ? 366 : 365);
+}
+
+static const int kDaysInMonth[13] = {
+ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+int64 SecondsPerMonth(int month, bool leap) {
+ if (month == 2 && leap) {
+ return kSecondsPerDay * (kDaysInMonth[month] + 1);
+ }
+ return kSecondsPerDay * kDaysInMonth[month];
+}
+
+static const int kDaysSinceJan[13] = {
+ 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
+};
+
+bool ValidateDateTime(const DateTime& time) {
+ if (time.year < 1 || time.year > 9999 ||
+ time.month < 1 || time.month > 12 ||
+ time.day < 1 || time.day > 31 ||
+ time.hour < 0 || time.hour > 23 ||
+ time.minute < 0 || time.minute > 59 ||
+ time.second < 0 || time.second > 59) {
+ return false;
+ }
+ if (time.month == 2 && IsLeapYear(time.year)) {
+ return time.month <= kDaysInMonth[time.month] + 1;
+ } else {
+ return time.month <= kDaysInMonth[time.month];
+ }
+}
+
+// Count the number of seconds elapsed from 0001-01-01T00:00:00 to the given
+// time.
+int64 SecondsSinceCommonEra(const DateTime& time) {
+ int64 result = 0;
+ // Years should be between 1 and 9999.
+ assert(time.year >= 1 && time.year <= 9999);
+ int year = 1;
+ if ((time.year - year) >= 400) {
+ int count_400years = (time.year - year) / 400;
+ result += kSecondsPer400Years * count_400years;
+ year += count_400years * 400;
+ }
+ while ((time.year - year) >= 100) {
+ result += SecondsPer100Years(year);
+ year += 100;
+ }
+ while ((time.year - year) >= 4) {
+ result += SecondsPer4Years(year);
+ year += 4;
+ }
+ while (time.year > year) {
+ result += SecondsPerYear(year);
+ ++year;
+ }
+ // Months should be between 1 and 12.
+ assert(time.month >= 1 && time.month <= 12);
+ int month = time.month;
+ result += kSecondsPerDay * kDaysSinceJan[month];
+ if (month > 2 && IsLeapYear(year)) {
+ result += kSecondsPerDay;
+ }
+ assert(time.day >= 1 &&
+ time.day <= (month == 2 && IsLeapYear(year)
+ ? kDaysInMonth[month] + 1
+ : kDaysInMonth[month]));
+ result += kSecondsPerDay * (time.day - 1);
+ result += kSecondsPerHour * time.hour +
+ kSecondsPerMinute * time.minute +
+ time.second;
+ return result;
+}
+
+// Format nanoseconds with either 3, 6, or 9 digits depending on the required
+// precision to represent the exact value.
+string FormatNanos(int32 nanos) {
+ if (nanos % kNanosPerMillisecond == 0) {
+ return StringPrintf("%03d", nanos / kNanosPerMillisecond);
+ } else if (nanos % kNanosPerMicrosecond == 0) {
+ return StringPrintf("%06d", nanos / kNanosPerMicrosecond);
+ } else {
+ return StringPrintf("%09d", nanos);
+ }
+}
+
+// Parses an integer from a null-terminated char sequence. The method
+// consumes at most "width" chars. Returns a pointer after the consumed
+// integer, or NULL if the data does not start with an integer or the
+// integer value does not fall in the range of [min_value, max_value].
+const char* ParseInt(const char* data, int width, int min_value,
+ int max_value, int* result) {
+ if (!ascii_isdigit(*data)) {
+ return NULL;
+ }
+ int value = 0;
+ for (int i = 0; i < width; ++i, ++data) {
+ if (ascii_isdigit(*data)) {
+ value = value * 10 + (*data - '0');
+ } else {
+ break;
+ }
+ }
+ if (value >= min_value && value <= max_value) {
+ *result = value;
+ return data;
+ } else {
+ return NULL;
+ }
+}
+
+// Consumes the fractional parts of a second into nanos. For example,
+// "010" will be parsed to 10000000 nanos.
+const char* ParseNanos(const char* data, int32* nanos) {
+ if (!ascii_isdigit(*data)) {
+ return NULL;
+ }
+ int value = 0;
+ int len = 0;
+ // Consume as many digits as there are but only take the first 9 into
+ // account.
+ while (ascii_isdigit(*data)) {
+ if (len < 9) {
+ value = value * 10 + *data - '0';
+ }
+ ++len;
+ ++data;
+ }
+ while (len < 9) {
+ value = value * 10;
+ ++len;
+ }
+ *nanos = value;
+ return data;
+}
+
+const char* ParseTimezoneOffset(const char* data, int64* offset) {
+ // Accept format "HH:MM". E.g., "08:00"
+ int hour;
+ if ((data = ParseInt(data, 2, 0, 23, &hour)) == NULL) {
+ return NULL;
+ }
+ if (*data++ != ':') {
+ return NULL;
+ }
+ int minute;
+ if ((data = ParseInt(data, 2, 0, 59, &minute)) == NULL) {
+ return NULL;
+ }
+ *offset = (hour * 60 + minute) * 60;
+ return data;
+}
+} // namespace
+
+bool SecondsToDateTime(int64 seconds, DateTime* time) {
+ if (seconds < kMinTime || seconds > kMaxTime) {
+ return false;
+ }
+ // It's easier to calcuate the DateTime starting from 0001-01-01T00:00:00
+ seconds = seconds + kSecondsFromEraToEpoch;
+ int year = 1;
+ if (seconds >= kSecondsPer400Years) {
+ int count_400years = seconds / kSecondsPer400Years;
+ year += 400 * count_400years;
+ seconds %= kSecondsPer400Years;
+ }
+ while (seconds >= SecondsPer100Years(year)) {
+ seconds -= SecondsPer100Years(year);
+ year += 100;
+ }
+ while (seconds >= SecondsPer4Years(year)) {
+ seconds -= SecondsPer4Years(year);
+ year += 4;
+ }
+ while (seconds >= SecondsPerYear(year)) {
+ seconds -= SecondsPerYear(year);
+ year += 1;
+ }
+ bool leap = IsLeapYear(year);
+ int month = 1;
+ while (seconds >= SecondsPerMonth(month, leap)) {
+ seconds -= SecondsPerMonth(month, leap);
+ ++month;
+ }
+ int day = 1 + seconds / kSecondsPerDay;
+ seconds %= kSecondsPerDay;
+ int hour = seconds / kSecondsPerHour;
+ seconds %= kSecondsPerHour;
+ int minute = seconds / kSecondsPerMinute;
+ seconds %= kSecondsPerMinute;
+ time->year = year;
+ time->month = month;
+ time->day = day;
+ time->hour = hour;
+ time->minute = minute;
+ time->second = static_cast<int>(seconds);
+ return true;
+}
+
+bool DateTimeToSeconds(const DateTime& time, int64* seconds) {
+ if (!ValidateDateTime(time)) {
+ return false;
+ }
+ *seconds = SecondsSinceCommonEra(time) - kSecondsFromEraToEpoch;
+ return true;
+}
+
+void GetCurrentTime(int64* seconds, int32* nanos) {
+ // TODO(xiaofeng): Improve the accuracy of this implementation (or just
+ // remove this method from protobuf).
+ *seconds = time(NULL);
+ *nanos = 0;
+}
+
+string FormatTime(int64 seconds, int32 nanos) {
+ DateTime time;
+ if (nanos < 0 || nanos > 999999999 || !SecondsToDateTime(seconds, &time)) {
+ return "InvalidTime";
+ }
+ string result = StringPrintf("%04d-%02d-%02dT%02d:%02d:%02d",
+ time.year, time.month, time.day,
+ time.hour, time.minute, time.second);
+ if (nanos != 0) {
+ result += "." + FormatNanos(nanos);
+ }
+ return result + "Z";
+}
+
+bool ParseTime(const string& value, int64* seconds, int32* nanos) {
+ DateTime time;
+ const char* data = value.c_str();
+ // We only accept:
+ // Z-normalized: 2015-05-20T13:29:35.120Z
+ // With UTC offset: 2015-05-20T13:29:35.120-08:00
+
+ // Parse year
+ if ((data = ParseInt(data, 4, 1, 9999, &time.year)) == NULL) {
+ return false;
+ }
+ // Expect '-'
+ if (*data++ != '-') return false;
+ // Parse month
+ if ((data = ParseInt(data, 2, 1, 12, &time.month)) == NULL) {
+ return false;
+ }
+ // Expect '-'
+ if (*data++ != '-') return false;
+ // Parse day
+ if ((data = ParseInt(data, 2, 1, 31, &time.day)) == NULL) {
+ return false;
+ }
+ // Expect 'T'
+ if (*data++ != 'T') return false;
+ // Parse hour
+ if ((data = ParseInt(data, 2, 0, 23, &time.hour)) == NULL) {
+ return false;
+ }
+ // Expect ':'
+ if (*data++ != ':') return false;
+ // Parse minute
+ if ((data = ParseInt(data, 2, 0, 59, &time.minute)) == NULL) {
+ return false;
+ }
+ // Expect ':'
+ if (*data++ != ':') return false;
+ // Parse second
+ if ((data = ParseInt(data, 2, 0, 59, &time.second)) == NULL) {
+ return false;
+ }
+ if (!DateTimeToSeconds(time, seconds)) {
+ return false;
+ }
+ // Parse nanoseconds.
+ if (*data == '.') {
+ ++data;
+ // Parse nanoseconds.
+ if ((data = ParseNanos(data, nanos)) == NULL) {
+ return false;
+ }
+ } else {
+ *nanos = 0;
+ }
+ // Parse UTC offsets.
+ if (*data == 'Z') {
+ ++data;
+ } else if (*data == '+') {
+ ++data;
+ int64 offset;
+ if ((data = ParseTimezoneOffset(data, &offset)) == NULL) {
+ return false;
+ }
+ *seconds -= offset;
+ } else if (*data == '-') {
+ ++data;
+ int64 offset;
+ if ((data = ParseTimezoneOffset(data, &offset)) == NULL) {
+ return false;
+ }
+ *seconds += offset;
+ } else {
+ return false;
+ }
+ // Done with parsing.
+ return *data == 0;
+}
+
+} // namespace internal
+} // namespace protobuf
+} // namespace google
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