man/zip_file_extra_field_set.man

.\" zip_file_extra_field_set.mdoc \-- set 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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.TH ZIP_FILE_EXTRA_FIELD_SET 3 "June 23, 2012" NiH
.SH "NAME"
zip_file_extra_field_set \- set extra field for file in zip
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
#include <zip.h>
.PP
int
zip_file_extra_field_set(struct zip *archive, zip_uint64_t index); \
"zip_uint16_t extra_field_id" "zip_uint16_t extra_field_index" \
"const zip_uint8_t *extra_field_data" "zip_uint16_t len" \
"zip_flags_t flags"
.SH "DESCRIPTION"
The
zip_file_extra_field_set
function sets the extra field with ID (two-byte signature)
\fBextra_field_id\fR
and index
\fBextra_field_index\fR
for the file at position
\fBindex\fR
in the zip archive.
The extra field's data will be set to
\fBextra_field_data\fR
and length
\fBlen.\fR
If a new entry shall be appended, set
\fBextra_field_index\fR
to
\fBZIP_EXTRA_FIELD_NEW.\fR
.PP
The following flags are supported:
.RS
.TP 18
\fBZIP_FL_CENTRAL\fR
Only sets extra field in the archive's central directory.
.TP 18
\fBZIP_FL_LOCAL\fR
Only sets extra field in the local file headers.
.RE
.PP
Please note that the extra field IDs 0x0001 (ZIP64 extension),
0x6375 (Infozip UTF-8 comment), and
0x7075 (Infozip UTF-8 file name) can not be set using
zip_file_extra_field_set
since they are set by
libzip(3)
automatically when needed.
.SH "RETURN VALUES"
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error code in
\fBarchive\fR
is set to indicate the error.
.SH "ERRORS"
zip_file_extra_field_set
fails if:
.RS
.TP 4
[ZIP_ER_INVAL]
The extra field size is too large (ID and length need 4 bytes; the
maximum length of all extra fields for one file combined is 65536
bytes).
This error also occurs if
\fBextra_field_index\fR
is too large.
.TP 4
[ZIP_ER_MEMORY]
Required memory could not be allocated.
.TP 4
[ZIP_ER_NOENT]
\fBindex\fR
is not a valid file index in
\fBarchive.\fR
.RE
.SH "SEE ALSO"
libzip(3),
zip_file_extra_field_delete(3),
zip_file_extra_field_get(3),
zip_file_extra_fields_count(3)
.SH "AUTHORS"

Dieter Baron <dillo@nih.at>
and
Thomas Klausner <tk@giga.or.at>