index, const char
zip_file_set_comment() function sets the comment for the file at position index in the zip archive to comment of length len. If comment is
NULLand len is 0, the file comment will be removed. The flags argument can be any of:
zip_file_set_comment() fails if:
- index is not a valid file index in archive, or len is less than 0 or longer than the maximum comment length in a zip file (65535), or comment is not a valid UTF-8 encoded string.
- Required memory could not be allocated.
- The archive was opened in read-only mode.
zip_file_set_comment() was added in libzip 0.11.