zip_file_extra_fields_count, zip_file_extra_fields_count_by_id — count extra fields for file in zip

Authors

       Dieter Baron <dillo@nih.at> and Thomas Klausner <wiz@gatalith.at>

Debian                                          December 18, 2017                 ZIP_FILE_EXTRA_FIELDS_COUNT(3)

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.

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.

History

zip_file_extra_fields_count() and zip_file_extra_fields_count_by_id() were added in libzip 0.11.

Library

       libzip (-lzip)

Name

       zip_file_extra_fields_count, zip_file_extra_fields_count_by_id — count extra fields for file in zip

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.

Synopsis

#include<zip.h>zip_int16_tzip_file_extra_fields_count(zip_t*archive, zip_uint64_tindex, zip_flags_tflags);

       zip_int16_tzip_file_extra_fields_count_by_id(zip_t*archive,   zip_uint64_tindex,  zip_uint16_textra_field_id,
           zip_flags_tflags);