.\" Automatically generated from an mdoc input file.  Do not edit.
.\" zip_open.mdoc -- open zip archive
.\" Copyright (C) 2003-2022 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
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.TH "ZIP_OPEN" "3" "May 5, 2025" "NiH" "Library Functions Manual"
.nh
.if n .ad l
.SH "NAME"
\fBzip_open\fR,
\fBzip_open_from_source\fR
\- open zip archive
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
\fB#include <zip.h>\fR
.sp
\fIzip_t *\fR
.br
.PD 0
.HP 4n
\fBzip_open\fR(\fIconst\ char\ *path\fR, \fIint\ flags\fR, \fIint\ *errorp\fR);
.PD
.PP
\fIzip_t *\fR
.br
.PD 0
.HP 4n
\fBzip_open_from_source\fR(\fIzip_source_t\ *zs\fR, \fIint\ flags\fR, \fIzip_error_t\ *ze\fR);
.PD
.SH "DESCRIPTION"
The
\fBzip_open\fR()
function opens the zip archive specified by
\fIpath\fR
and returns a pointer to a
\fIstruct zip\fR,
used to manipulate the archive.
The
\fIflags\fR
are specified by
\fIor\fR'ing
the following values, or 0 for none of them.
.RS 6n
.TP 15n
\fRZIP_CHECKCONS\fR
Perform additional stricter consistency checks on the archive, and
error if they fail.
.TP 15n
\fRZIP_CREATE\fR
Create the archive if it does not exist.
.TP 15n
\fRZIP_EXCL\fR
Error if archive already exists.
.TP 15n
\fRZIP_TRUNCATE\fR
If archive exists, ignore its current contents.
In other words, handle it the same way as an empty archive.
.TP 15n
\fRZIP_RDONLY\fR
Open archive in read-only mode.
.RE
.PP
If an error occurs and
\fIerrorp\fR
is
non-\fRNULL\fR,
it will be set to the corresponding error code.
.PP
The
\fBzip_open_from_source\fR()
function opens a zip archive encapsulated by the zip_source
\fIzs\fR
using the provided
\fIflags\fR.
In case of error, the zip_error
\fIze\fR
is filled in.
.SH "RETURN VALUES"
Upon successful completion
\fBzip_open\fR()
and
\fBzip_open_from_source\fR()
return a
\fIstruct zip\fR
pointer.
Otherwise,
\fRNULL\fR
is returned and
\fBzip_open\fR()
sets
\fI*errorp\fR
to indicate the error, while
\fBzip_open_from\fR(\fIsource\fR)
sets
\fIze\fR
to indicate the error.
.SH "EXAMPLES"
Here's an example of how you could report errors during
\fBzip_open\fR:
.nf
.sp
.RS 0n
    zip_t *za;
    int err;

    if ((za = zip_open(name, 0, &err)) == NULL) {
        zip_error_t error;
        zip_error_init_with_code(&error, err);
        fprintf(stderr, "%s: cannot open zip archive '%s': %s\en",
	        progname, name, zip_error_strerror(&error));
        zip_error_fini(&error);
        return -1;
    }
.RE
.fi
.SH "ERRORS"
The archive specified by
\fIpath\fR
is opened unless:
.TP 19n
[\fRZIP_ER_EXISTS\fR]
The file specified by
\fIpath\fR
exists and
\fRZIP_EXCL\fR
is set.
.TP 19n
[\fRZIP_ER_INCONS\fR]
Inconsistencies were found in the file specified by
\fIpath\fR.
This error is often caused by specifying
\fRZIP_CHECKCONS\fR
but can also happen without it.
.TP 19n
[\fRZIP_ER_INVAL\fR]
The
\fIpath\fR
argument is
\fRNULL\fR.
.TP 19n
[\fRZIP_ER_MEMORY\fR]
Required memory could not be allocated.
.TP 19n
[\fRZIP_ER_NOENT\fR]
The file specified by
\fIpath\fR
does not exist and
\fRZIP_CREATE\fR
is not set.
.TP 19n
[\fRZIP_ER_NOZIP\fR]
The file specified by
\fIpath\fR
is not a zip archive.
.TP 19n
[\fRZIP_ER_OPEN\fR]
The file specified by
\fIpath\fR
could not be opened.
.TP 19n
[\fRZIP_ER_READ\fR]
A read error occurred; see
\fIerrno\fR
for details.
.TP 19n
[\fRZIP_ER_SEEK\fR]
The file specified by
\fIpath\fR
does not allow seeks.
.PD 0
.PP
For newly created archives,
\fBzip_open\fR()
does not try to create the file; this is done when calling
zip_close(3)
and any errors, like missing write permissions, will
be reported then.
.PD
.SH "SEE ALSO"
libzip(3),
zip_close(3),
zip_error_strerror(3),
zip_fdopen(3),
zip_source(5)
.SH "HISTORY"
\fBzip_open\fR()
and
\fBzip_open_from_source\fR()
were added in libzip 1.0.
.SH "AUTHORS"
Dieter Baron <\fIdillo@nih.at\fR>
and
Thomas Klausner <\fIwiz@gatalith.at\fR>