.\" zip_file_extra_field_delete.mdoc -- delete extra field for file in zip
.\" Copyright (C) 2012 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP files.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd June 23, 2012
.Dt ZIP_FILE_EXTRA_FIELD_DELETE 3
.Os
.Sh NAME
.Nm zip_file_extra_field_delete ,
.Nm zip_file_extra_field_delete_by_id
.Nd delete extra field for file in zip
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft int
.Fn zip_file_extra_field_delete "struct zip *archive" "zip_uint64_t index" \
"zip_uint16_t extra_field_index" "zip_flags_t flags"
.Ft int
.Fn zip_file_extra_field_delete_by_id "struct zip *archive" "zip_uint64_t index" \
"zip_uint16_t extra_field_id" "zip_uint16_t extra_field_index" "zip_flags_t flags"
.Sh DESCRIPTION
The
.Fn zip_file_extra_field_delete
function deletes the extra field with index
.Ar extra_field_index
for the file at position
.Ar index
in the zip archive.
.Pp
If
.Ar index
is
.Dv ZIP_EXTRA_FIELD_ALL ,
then all extra fields will be deleted.
.Pp
The following flags are supported:
.Bl -tag -width ZIP_FL_CENTRALXX -offset indent
.It Dv ZIP_FL_CENTRAL
Delete only extra fields from the archive's central directory.
.It Dv ZIP_FL_LOCAL
Delete only extra fields from the local file headers.
.El
.Pp
The
.Fn zip_file_extra_field_delete_by_id
function deletes the extra field with ID (two-byte signature)
.Ar extra_field_id
and index
.Ar extra_field_index
(in other words, the
.Ar extra_field_index Ns No 'th
extra field with ID
.Ar extra_field_id )
The other arguments are the same as for
.Fn zip_file_extra_field_delete
.Dv ( ZIP_EXTRA_FIELD_ALL
will delete all extra fields the specified ID).
.Sh RETURN VALUES
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error code in
.Ar archive
is set to indicate the error.
.Sh ERRORS
.Fn zip_file_extra_field_delete
and
.Fn zip_file_extra_field_delete_by_id
fail if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_NOENT
.Ar index
is not a valid file index in
.Ar archive .
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_file_extra_field_get 3 ,
.Xr zip_file_extra_field_set 3 ,
.Xr zip_file_extra_fields_count 3
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq dillo@nih.at
and
.An Thomas Klausner Aq tk@giga.or.at