zip_file_extra_fields_count - Man Page
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)
History
zip_file_extra_fields_count() and zip_file_extra_fields_count_by_id() were added in libzip 0.11.
Authors
Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
Referenced By
libzip(3), zip_file_extra_field_delete(3), zip_file_extra_field_get(3), zip_file_extra_field_set(3).
The man page zip_file_extra_fields_count_by_id(3) is an alias of zip_file_extra_fields_count(3).