1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include "tool_filetime.h"
23
24 #include "curlx.h"
25
26 #ifdef HAVE_UTIME_H
27 # include <utime.h>
28 #elif defined(HAVE_SYS_UTIME_H)
29 # include <sys/utime.h>
30 #endif
31
getfiletime(const char * filename,FILE * error_stream)32 curl_off_t getfiletime(const char *filename, FILE *error_stream)
33 {
34 curl_off_t result = -1;
35
36 /* Windows stat() may attempt to adjust the unix GMT file time by a daylight
37 saving time offset and since it's GMT that is bad behavior. When we have
38 access to a 64-bit type we can bypass stat and get the times directly. */
39 #if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
40 HANDLE hfile;
41 TCHAR *tchar_filename = curlx_convert_UTF8_to_tchar((char *)filename);
42
43 hfile = CreateFile(tchar_filename, FILE_READ_ATTRIBUTES,
44 (FILE_SHARE_READ | FILE_SHARE_WRITE |
45 FILE_SHARE_DELETE),
46 NULL, OPEN_EXISTING, 0, NULL);
47 curlx_unicodefree(tchar_filename);
48 if(hfile != INVALID_HANDLE_VALUE) {
49 FILETIME ft;
50 if(GetFileTime(hfile, NULL, NULL, &ft)) {
51 curl_off_t converted = (curl_off_t)ft.dwLowDateTime
52 | ((curl_off_t)ft.dwHighDateTime) << 32;
53
54 if(converted < CURL_OFF_T_C(116444736000000000)) {
55 fprintf(error_stream,
56 "Failed to get filetime: underflow\n");
57 }
58 else {
59 result = (converted - CURL_OFF_T_C(116444736000000000)) / 10000000;
60 }
61 }
62 else {
63 fprintf(error_stream,
64 "Failed to get filetime: "
65 "GetFileTime failed: GetLastError %u\n",
66 (unsigned int)GetLastError());
67 }
68 CloseHandle(hfile);
69 }
70 else if(GetLastError() != ERROR_FILE_NOT_FOUND) {
71 fprintf(error_stream,
72 "Failed to get filetime: "
73 "CreateFile failed: GetLastError %u\n",
74 (unsigned int)GetLastError());
75 }
76 #else
77 struct_stat statbuf;
78 if(-1 != stat(filename, &statbuf)) {
79 result = (curl_off_t)statbuf.st_mtime;
80 }
81 else if(errno != ENOENT) {
82 fprintf(error_stream,
83 "Failed to get filetime: %s\n", strerror(errno));
84 }
85 #endif
86 return result;
87 }
88
89 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
90 (defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8))
setfiletime(curl_off_t filetime,const char * filename,FILE * error_stream)91 void setfiletime(curl_off_t filetime, const char *filename,
92 FILE *error_stream)
93 {
94 if(filetime >= 0) {
95 /* Windows utime() may attempt to adjust the unix GMT file time by a daylight
96 saving time offset and since it's GMT that is bad behavior. When we have
97 access to a 64-bit type we can bypass utime and set the times directly. */
98 #if defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)
99 HANDLE hfile;
100 TCHAR *tchar_filename = curlx_convert_UTF8_to_tchar((char *)filename);
101
102 /* 910670515199 is the maximum unix filetime that can be used as a
103 Windows FILETIME without overflow: 30827-12-31T23:59:59. */
104 if(filetime > CURL_OFF_T_C(910670515199)) {
105 fprintf(error_stream,
106 "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
107 " on outfile: overflow\n", filetime);
108 curlx_unicodefree(tchar_filename);
109 return;
110 }
111
112 hfile = CreateFile(tchar_filename, FILE_WRITE_ATTRIBUTES,
113 (FILE_SHARE_READ | FILE_SHARE_WRITE |
114 FILE_SHARE_DELETE),
115 NULL, OPEN_EXISTING, 0, NULL);
116 curlx_unicodefree(tchar_filename);
117 if(hfile != INVALID_HANDLE_VALUE) {
118 curl_off_t converted = ((curl_off_t)filetime * 10000000) +
119 CURL_OFF_T_C(116444736000000000);
120 FILETIME ft;
121 ft.dwLowDateTime = (DWORD)(converted & 0xFFFFFFFF);
122 ft.dwHighDateTime = (DWORD)(converted >> 32);
123 if(!SetFileTime(hfile, NULL, &ft, &ft)) {
124 fprintf(error_stream,
125 "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
126 " on outfile: SetFileTime failed: GetLastError %u\n",
127 filetime, (unsigned int)GetLastError());
128 }
129 CloseHandle(hfile);
130 }
131 else {
132 fprintf(error_stream,
133 "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
134 " on outfile: CreateFile failed: GetLastError %u\n",
135 filetime, (unsigned int)GetLastError());
136 }
137
138 #elif defined(HAVE_UTIMES)
139 struct timeval times[2];
140 times[0].tv_sec = times[1].tv_sec = (time_t)filetime;
141 times[0].tv_usec = times[1].tv_usec = 0;
142 if(utimes(filename, times)) {
143 fprintf(error_stream,
144 "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
145 " on outfile: %s\n", filetime, strerror(errno));
146 }
147
148 #elif defined(HAVE_UTIME)
149 struct utimbuf times;
150 times.actime = (time_t)filetime;
151 times.modtime = (time_t)filetime;
152 if(utime(filename, ×)) {
153 fprintf(error_stream,
154 "Failed to set filetime %" CURL_FORMAT_CURL_OFF_T
155 " on outfile: %s\n", filetime, strerror(errno));
156 }
157 #endif
158 }
159 }
160 #endif /* defined(HAVE_UTIME) || defined(HAVE_UTIMES) || \
161 (defined(WIN32) && (SIZEOF_CURL_OFF_T >= 8)) */
162