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ZIP_FILE_EXTRA_FIELDS_COUNT(3) Library Functions Manual ZIP_FILE_EXTRA_FIELDS_COUNT(3)

NAME

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

The following flags are supported:

Count extra fields from the archive's central directory.
Count extra fields from the local file headers.
Count the original unchanged extra fields, ignoring any changes made.

The () 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:

[]
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>

December 18, 2017 Linux 5.14.0-427.18.1.el9_4.x86_64