.\" $NiH: zip_source_zip.mdoc,v 1.7 2005/07/20 17:18:04 wiz Exp $
.\"
.\" zip_source_zip.mdoc -- create data source from zip file
.\" Copyright (C) 2004, 2005 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>
.\"
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.Dd July 29, 2005
.Dt ZIP_SOURCE_ZIP 3
.Os
.Sh NAME
.Nm zip_source_zip
.Nd create data source from zip file
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft struct zip_source *
.Fn zip_source_zip "struct zip *archive" "struct zip *srcarchive" \
"int srcidx" "int flags" "off_t start" "off_t len"
.Sh DESCRIPTION
The function
.Fn zip_source_zip
creates a zip source from a file in a zip archive.
The
.Ar srcarchive
argument is the (open) zip archive containing the source zip file
at index
.Ar srcidx .
.Ar len
bytes from offset
.Ar start
will be used in the zip_source.
If
.Ar len
is 0 or \-1, the rest of the file, starting from
.Ar start ,
is used.
If
.Ar start
is zero and
.Ar len
is \-1, the whole file will be copied without decompressing it.
If
.Ar flags
is
.Dv ZIP_FL_UNCHANGED ,
.Fn zip_source_zip
will try to get the original data without any changes that may
have been made to
.Ar srcarchive
after opening it.
.\" XXX: document ZIP_FL_RECOMPRESS
.Sh RETURN VALUES
Upon successful completion, the created source is returned.
Otherwise,
.Dv NULL
is returned and the error code in
.Ar archive
is set to indicate the error.
.Sh ERRORS
.Fn zip_source_zip
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_CHANGED
Unchanged data was requested, but it is not available.
.It Bq Er ZIP_ER_INVAL
.Ar srcarchive ,
.Ar srcidx ,
.Ar start ,
or
.Ar len
are invalid.
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.El
Additionally, it can return all error codes from
.Fn zip_stat_index
and
.Fn zip_fopen_index .
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_add 3 ,
.Xr zip_replace 3 ,
.Xr zip_source_buffer 3 ,
.Xr zip_source_file 3 ,
.Xr zip_source_filep 3 ,
.Xr zip_source_free 3 ,
.Xr zip_source_function 3
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq dillo@giga.or.at
and
.An Thomas Klausner Aq tk@giga.or.at