.\" zip_set_file_compression.mdoc \-- set compression method and its flags
.\" 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_SET_FILE_COMPRESSION 3 "May 1, 2012" NiH
.SH "NAME"
zip_set_file_compression \- set compression method for file in zip
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
#include <zip.h>
.PP
int
zip_set_file_compression(struct zip *archive, zip_uint64_t index); \
"zip_int32_t comp" "zip_uint32_t comp_flags"
.SH "DESCRIPTION"
The
zip_set_file_compression
function sets the compression method for the file at position
\fBindex\fR
in the zip archive to
\fBcomp\fR
with the compression method specific
\fBcomp_flags.\fR
The
\fBcomp\fR
is the same as returned by
zip_stat(3).
For the
\fBcomp\fR
argument, currently only the following values are supported:
.RS
.TP 19
\fBZIP_CM_DEFAULT\fR
default compression; currently the same as
\fBZIP_CM_DEFLATE.\fR
.TP 19
\fBZIP_CM_STORE\fR
Store the file uncompressed.
.TP 19
\fBZIP_CM_DEFLATE\fR
Deflate the file with the
zlib(3)
algorithm and default options
.RE
.PP
The
\fBcomp_flags\fR
argument is currently ignored.
.\" For the comp_flags argument, the lower 4 bits define the compression
.\" level.
.\" 0 is fastest compression, 15 is highest compression
.\" \fBZIP_COMP_FL_DEFAULT\fR
.\" can be used to specify that the default shall be used.
.\" Further compression method specific flags will be added over time.
.PP
The current compression method for a file in a zip archive can be
determined using
zip_stat(3).
.SH "RETURN VALUES"
Upon successful completion 0 is returned.
Otherwise, \-1 is returned and the error information in
\fBarchive\fR
is set to indicate the error.
.SH "ERRORS"
zip_set_file_compression
fails if:
.RS
.TP 4
[ZIP_ER_INVAL]
\fBindex\fR
is not a valid file index in
\fBarchive,\fR
or the argument combination is invalid.
.TP 4
[ZIP_ER_COMPNOTSUPP]
Unsupported compression method requested.
.TP 4
[ZIP_ER_RDONLY]
Read-only zip file, no changes allowed.
.RE
.SH "SEE ALSO"
libzip(3),
zip_stat(3)
.SH "AUTHORS"

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