.\" zip_fdopen.mdoc -- open zip archive using existing file descriptor
.\" Copyright (C) 2009-2020 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
.\" The authors can be contacted at <libzip@nih.at>
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in
.\"    the documentation and/or other materials provided with the
.\"    distribution.
.\" 3. The names of the authors may not be used to endorse or promote
.\"    products derived from this software without specific prior
.\"    written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
.\" GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
.\" IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
.\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd December 18, 2017
.Dt ZIP_FDOPEN 3
.Os
.Sh NAME
.Nm zip_fdopen
.Nd open zip archive using open file descriptor
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft zip_t *
.Fn zip_fdopen "int fd" "int flags" "int *errorp"
.Sh DESCRIPTION
The zip archive specified by the open file descriptor
.Ar fd
is opened and a pointer to a
.Ft struct zip ,
used to manipulate the archive, is returned.
In contrast to
.Xr zip_open 3 ,
using
.Nm zip_fdopen
the archive can only be opened in read-only mode.
The
.Ar fd
argument may not be used any longer after calling
.Nm zip_fdopen .
The
.Fa flags
are specified by
.Em or Ns No 'ing
the following values, or 0 for none of them.
.Bl -tag -offset indent -width ZIP_CHECKCONS
.It Dv ZIP_CHECKCONS
Perform additional stricter consistency checks on the archive, and
error if they fail.
.El
.Pp
If an error occurs and
.Ar errorp
is
.No non- Ns Dv NULL ,
it will be set to the corresponding error code.
.Sh RETURN VALUES
Upon successful completion
.Fn zip_fdopen
returns a
.Ft struct zip
pointer, and
.Ar fd
should not be used any longer, nor passed to
.Xr close 2 .
Otherwise,
.Dv NULL
is returned and
.Ar *errorp
is set to indicate the error.
In the error case,
.Ar fd
remains unchanged.
.Sh ERRORS
The file specified by
.Ar fd
is prepared for use by
.Xr libzip 3
unless:
.Bl -tag -width Er
.It Bq Er ZIP_ER_INCONS
Inconsistencies were found in the file specified by
.Ar path .
This error is often caused by specifying
.Dv ZIP_CHECKCONS
but can also happen without it.
.It Bq Er ZIP_ER_INVAL
The
.Ar flags
argument is invalid.
Not all
.Xr zip_open 3
flags are allowed for
.Nm zip_fdopen ,
see
.Sx DESCRIPTION .
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.It Bq Er ZIP_ER_NOZIP
The file specified by
.Ar fd
is not a zip archive.
.It Bq Er ZIP_ER_OPEN
The file specified by
.Ar fd
could not be prepared for use by
.Xr libzip 3 .
.It Bq Er ZIP_ER_READ
A read error occurred; see
.Va errno
for details.
.It Bq Er ZIP_ER_SEEK
The file specified by
.Ar fd
does not allow seeks.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_close 3 ,
.Xr zip_error_strerror 3 ,
.Xr zip_open 3
.Sh HISTORY
.Fn zip_fdopen
was added in libzip 1.0.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at