NAME

       zip_file_extra_field_set - set extra field for file in zip

LIBRARY

       libzip (-lzip)

SYNOPSIS

       #include <zip.h>

       int
       zip_file_extra_field_set(zip_t *archive, zip_uint64_t index, zip_uint16_t extra_field_id,
           zip_uint16_t extra_field_index, const zip_uint8_t *extra_field_data, zip_uint16_t len,
           zip_flags_t flags);

DESCRIPTION

       The zip_file_extra_field_set() function sets the extra field with ID (two-byte signature)
       extra_field_id and index extra_field_index for the file at position index in the zip
       archive.  The extra field's data will be set to extra_field_data and length len.  If a new
       entry shall be appended, set extra_field_index to ZIP_EXTRA_FIELD_NEW.

       At least one of the following flags must be set:

             ZIP_FL_CENTRAL    Set extra field in the archive's central directory.

             ZIP_FL_LOCAL      Set extra field in the local file headers.

       Please note that the extra field IDs 0x0001 (ZIP64 extension), 0x6375 (Infozip UTF-8
       comment), and 0x7075 (Infozip UTF-8 file name) can not be set using
       zip_file_extra_field_set() since they are set by libzip(3) automatically when needed.

RETURN VALUES

       Upon successful completion 0 is returned.  Otherwise, -1 is returned and the error code in
       archive is set to indicate the error.

ERRORS

       zip_file_extra_field_set() fails if:

       [ZIP_ER_INVAL]     The extra field size is too large (ID and length need 4 bytes; the
                          maximum length of all extra fields for one file combined is 65536
                          bytes).  This error also occurs if extra_field_index is too large.

       [ZIP_ER_MEMORY]    Required memory could not be allocated.

       [ZIP_ER_NOENT]     index is not a valid file index in archive.

SEE ALSO

       libzip(3), zip_file_extra_field_delete(3), zip_file_extra_field_get(3),
       zip_file_extra_fields_count(3)

AUTHORS

       Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>