MtpUtils.cpp revision 37b216c75ca5e38f1a56a86a95b04ff6b4e71ae7 
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#define LOG_TAG "MtpUtils"
18
19#include <stdio.h>
20#include <time.h>
21
22#include <../private/bionic_time.h> /* TODO: switch this code to icu4c! */
23
24#include "MtpUtils.h"
25
26namespace android {
27
28/*
29DateTime strings follow a compatible subset of the definition found in ISO 8601, and
30take the form of a Unicode string formatted as: "YYYYMMDDThhmmss.s". In this
31representation, YYYY shall be replaced by the year, MM replaced by the month (01-12),
32DD replaced by the day (01-31), T is a constant character 'T' delimiting time from date,
33hh is replaced by the hour (00-23), mm is replaced by the minute (00-59), and ss by the
34second (00-59). The ".s" is optional, and represents tenths of a second.
35*/
36
37bool parseDateTime(const char* dateTime, time_t& outSeconds) {
38    int year, month, day, hour, minute, second;
39    struct tm tm;
40
41    if (sscanf(dateTime, "%04d%02d%02dT%02d%02d%02d",
42            &year, &month, &day, &hour, &minute, &second) != 6)
43        return false;
44    const char* tail = dateTime + 15;
45    // skip optional tenth of second
46    if (tail[0] == '.' && tail[1])
47        tail += 2;
48    //FIXME - support +/-hhmm
49    bool useUTC = (tail[0] == 'Z');
50
51    // hack to compute timezone
52    time_t dummy;
53    localtime_r(&dummy, &tm);
54
55    tm.tm_sec = second;
56    tm.tm_min = minute;
57    tm.tm_hour = hour;
58    tm.tm_mday = day;
59    tm.tm_mon = month - 1;  // mktime uses months in 0 - 11 range
60    tm.tm_year = year - 1900;
61    tm.tm_wday = 0;
62    tm.tm_isdst = -1;
63    if (useUTC)
64        outSeconds = mktime(&tm);
65    else
66        outSeconds = mktime_tz(&tm, tm.tm_zone);
67
68    return true;
69}
70
71void formatDateTime(time_t seconds, char* buffer, int bufferLength) {
72    struct tm tm;
73
74    localtime_r(&seconds, &tm);
75    snprintf(buffer, bufferLength, "%04d%02d%02dT%02d%02d%02d",
76        tm.tm_year + 1900,
77        tm.tm_mon + 1, // localtime_r uses months in 0 - 11 range
78        tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
79}
80
81}  // namespace android
82