zip_file_set_mtime(3) Library Functions Manual zip_file_set_mtime(3)
NAME
zip_file_set_dostime, zip_file_set_mtime - set last modification time
(mtime) for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
int
zip_file_set_dostime(zip_t *archive, zip_uint64_t index,
zip_uint16_t dostime, zip_uint16_t dosdate, zip_flags_t flags);
int
zip_file_set_mtime(zip_t *archive, zip_uint64_t index, time_t mtime,
zip_flags_t flags);
DESCRIPTION
The zip_file_set_mtime() function sets the last modification time (mtime)
for the file at position index in the zip archive to mtime. Currently, no
support for any flags is implemented.
In the zip archive, the time and date are saved as two 16-bit integers. To
set the values directly, call the zip_file_set_dostime() function. The
values of the time bytes are defined as follows:
0-4 seconds divided by two (1-2 = 1, 3-4 = 2, ...)
5-10 minute (0-59)
11-15 hour (0-23)
The values of the date bytes are defined as follows:
0-4 day of the month (1-31)
5-8 month (January = 1, February = 2, ...)
9-15 year offset from 1980 (1980 = 0, 1981 = 1, ...)
RETURN VALUES
Upon successful completion 0 is returned. Otherwise, -1 is returned and
the error information in archive is set to indicate the error.
ERRORS
zip_file_set_dostime() and zip_file_set_mtime() fail if:
[ZIP_ER_INVAL] index is not a valid file index in archive.
[ZIP_ER_MEMORY] Required memory could not be allocated.
[ZIP_ER_OPNOTSUPP]
Traditional PKWare encryption uses the file's mtime,
therefore it cannot be changed without re-encrypting the
data.
[ZIP_ER_RDONLY] The archive was opened in read-only mode.
SEE ALSO
libzip(3), zip_stat(3)
HISTORY
zip_file_set_mtime() was added in libzip 1.0. zip_file_set_dostime() was
added in libzip 1.6.
AUTHORS
Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
CAVEATS
Following historical practice, the zip_file_set_mtime() function translates
the time from the zip archive into the local time zone. If you want to
avoid this, use the zip_file_set_dostime() function instead.
macOS 12.4 June 18, 2022 macOS 12.4
libzip 1.9.0 - Generated Mon Jun 20 15:07:53 CDT 2022