Provided by: libzip-dev_1.5.1-0ubuntu1_amd64
zip_file_extra_fields_count, zip_file_extra_fields_count_by_id — count extra fields for file in zip
#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);
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.
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.
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.
zip_file_extra_fields_count() and zip_file_extra_fields_count_by_id() were added in libzip 0.11.
Dieter Baron <firstname.lastname@example.org> and Thomas Klausner <email@example.com>