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)
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>