02-01-2019
I wrote some additional approaches in my page. And there was an extra variable (used for debugging) that I now removed in the first example. The is a space between the brackets in the field separator that should not be there in your example:
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LEARN ABOUT CENTOS
zip_set_file_extra
ZIP_SET_FILE_EXTRA(3) Library Functions Manual ZIP_SET_FILE_EXTRA(3)
NAME
zip_set_file_extra - set extra field for file in zip
LIBRARY
libzip (-lzip)
SYNOPSIS
#include <zip.h>
int zip_set_file_extra(struct zip *archive, zip_uint64_t index); "const char *extra" "int len"
DESCRIPTION
The zip_set_file_extra function sets the extra field for the file at position index in the zip archive to extra of length len. If extra is
NULL and len is 0, the file extra field will be removed.
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_set_file_extra fails if:
[ZIP_ER_INVAL]
index is not a valid file index in archive, or len is less than 0 or longer than the maximum extra field length in a zip file
(65535).
[ZIP_ER_MEMORY]
Required memory could not be allocated.
SEE ALSO
libzip(3), zip_get_file_extra(3)
AUTHORS
Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at>
NiH February 13, 2011 ZIP_SET_FILE_EXTRA(3)