MtpUtils.cpp revision 7850ef999740f214a1990a9c090d3f3865d435aa 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <time.h>
18
19#include <cutils/tztime.h>
20#include "MtpUtils.h"
21
22namespace android {
23
24/*
25DateTime strings follow a compatible subset of the definition found in ISO 8601, and
26take the form of a Unicode string formatted as: "YYYYMMDDThhmmss.s". In this
27representation, YYYY shall be replaced by the year, MM replaced by the month (01-12),
28DD replaced by the day (01-31), T is a constant character 'T' delimiting time from date,
29hh is replaced by the hour (00-23), mm is replaced by the minute (00-59), and ss by the
30second (00-59). The ".s" is optional, and represents tenths of a second.
31*/
32
33bool parseDateTime(const char* dateTime, time_t& outSeconds) {
34    int year, month, day, hour, minute, second;
35    struct tm tm;
36
37    if (sscanf(dateTime, "%04d%02d%02dT%02d%02d%02d",
38            &year, &month, &day, &hour, &minute, &second) != 6)
39        return false;
40    const char* tail = dateTime + 15;
41    // skip optional tenth of second
42    if (tail[0] == '.' && tail[1])
43        tail += 2;
44    //FIXME - support +/-hhmm
45    bool useUTC = (tail[0] == 'Z');
46
47    // hack to compute timezone
48    time_t dummy;
49    localtime_r(&dummy, &tm);
50
51    tm.tm_sec = second;
52    tm.tm_min = minute;
53    tm.tm_hour = hour;
54    tm.tm_mday = day;
55    tm.tm_mon = month;
56    tm.tm_year = year - 1900;
57    tm.tm_wday = 0;
58    tm.tm_isdst = -1;
59    if (useUTC)
60        outSeconds = mktime(&tm);
61    else
62        outSeconds = mktime_tz(&tm, tm.tm_zone);
63
64    return true;
65}
66
67void formatDateTime(time_t seconds, char* buffer, int bufferLength) {
68    struct tm tm;
69
70    localtime_r(&seconds, &tm);
71    snprintf(buffer, bufferLength, "%04d%02d%02dT%02d%02d%02d",
72        tm.tm_year + 1900, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
73}
74
75}  // namespace android
76