NAME

       zip_file_extra_fields_count, zip_file_extra_fields_count_by_id - count extra fields for
       file in zip

LIBRARY

       libzip (-lzip)

SYNOPSIS

       #include <zip.h>

       zip_int16_t
       zip_file_extra_fields_count(zip_t *archive, zip_uint64_t index, zip_flags_t flags);

       zip_int16_t
       zip_file_extra_fields_count_by_id(zip_t *archive, zip_uint64_t index,
           zip_uint16_t extra_field_id, zip_flags_t flags);

DESCRIPTION

       The zip_file_extra_fields_count() function counts the extra fields for the file at
       position index in the zip archive.

       The following flags are supported:

             ZIP_FL_CENTRAL    Count extra fields from the archive's central directory.

             ZIP_FL_LOCAL      Count extra fields from the local file headers.

             ZIP_FL_UNCHANGED  Count the original unchanged extra fields, ignoring any changes
                               made.

       The zip_file_extra_fields_count_by_id() function counts the extra fields with ID (two-byte
       signature) extra_field_id.  The other arguments are the same as for
       zip_file_extra_fields_count().

       Extra fields that are the same in the central directory and the local file header are
       merged into one.  Therefore, the counts with ZIP_FL_CENTRAL and ZIP_FL_LOCAL do not need
       to add up to the same value as when given ZIP_FL_CENTRAL|ZIP_FL_LOCAL at the same time.

RETURN VALUES

       Upon successful completion, the requested number of extra fields is returned.  Otherwise,
       -1 is returned and the error code in archive is set to indicate the error.

ERRORS

       zip_file_extra_fields_count() and zip_file_extra_fields_count_by_id() fail if:

       [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_field_set(3)

AUTHORS

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