.TH "ZIP_FILE_EXTRA_FIELDS_COUNT" "3" "December 18, 2017" "NiH" "Library Functions Manual"
.nh
.if n .ad l
.SH "NAME"
\fBzip_file_extra_fields_count\fR,
\fBzip_file_extra_fields_count_by_id\fR
\- count extra fields for file in zip
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
\fB#include <zip.h>\fR
.sp
\fIzip_int16_t\fR
.br
.PD 0
.HP 4n
\fBzip_file_extra_fields_count\fR(\fIzip_t\ *archive\fR, \fIzip_uint64_t\ index\fR, \fIzip_flags_t\ flags\fR);
.PD
.PP
\fIzip_int16_t\fR
.br
.PD 0
.HP 4n
\fBzip_file_extra_fields_count_by_id\fR(\fIzip_t\ *archive\fR, \fIzip_uint64_t\ index\fR, \fIzip_uint16_t\ extra_field_id\fR, \fIzip_flags_t\ flags\fR);
.PD
.SH "DESCRIPTION"
The
\fBzip_file_extra_fields_count\fR()
function counts the extra fields for the file at position
\fIindex\fR
in the zip archive.
.PP
The following
\fIflags\fR
are supported:
.RS 6n
.TP 18n
\fRZIP_FL_CENTRAL\fR
Count extra fields from the archive's central directory.
.TP 18n
\fRZIP_FL_LOCAL\fR
Count extra fields from the local file headers.
.TP 18n
\fRZIP_FL_UNCHANGED\fR
Count the original unchanged extra fields, ignoring any changes made.
.RE
.PP
The
\fBzip_file_extra_fields_count_by_id\fR()
function counts the extra fields with ID (two-byte signature)
\fIextra_field_id\fR.
The other arguments are the same as for
\fBzip_file_extra_fields_count\fR().
.PP
Extra fields that are the same in the central directory and the local file
header are merged into one.
Therefore, the counts with
\fRZIP_FL_CENTRAL\fR
and
\fRZIP_FL_LOCAL\fR
do not need to add up to the same value as when given
\fRZIP_FL_CENTRAL|ZIP_FL_LOCAL\fR
at the same time.
.SH "RETURN VALUES"
Upon successful completion, the requested number of extra fields is returned.
Otherwise, \-1 is returned and the error code in
\fIarchive\fR
is set to indicate the error.
.SH "ERRORS"
\fBzip_file_extra_fields_count\fR()
and
\fBzip_file_extra_fields_count_by_id\fR()
fail if:
.TP 19n
[\fRZIP_ER_NOENT\fR]
\fIindex\fR
is not a valid file index in
\fIarchive\fR.
.SH "SEE ALSO"
libzip(3),
zip_file_extra_field_delete(3),
zip_file_extra_field_get(3),
zip_file_extra_field_set(3)
.SH "HISTORY"
\fBzip_file_extra_fields_count\fR()
and
\fBzip_file_extra_fields_count_by_id\fR()
were added in libzip 0.11.
.SH "AUTHORS"
Dieter Baron <\fIdillo@nih.at\fR>
and
Thomas Klausner <\fItk@giga.or.at\fR>