.\" zip_source_zip.mdoc -- create data source from zip file
.\" Copyright (C) 2004-2020 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>
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.Dd December 18, 2017
.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 zip_source_t *
.Fn zip_source_zip "zip_t *archive" "zip_t *srcarchive" "zip_uint64_t srcidx" "zip_flags_t flags" "zip_uint64_t start" "zip_int64_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.
.Pp
Supported flags are:
.Bl -tag -width XZIPXFLXRECOMPRESSXXX
.It Dv ZIP_FL_UNCHANGED
Try to get the original data without any changes that may have been
made to
.Ar srcarchive
after opening it.
.It Dv ZIP_FL_RECOMPRESS
When adding the data from
.Ar srcarchive ,
re-compress it using the current settings instead of copying the
compressed data.
.El
.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_file_add 3 ,
.Xr zip_file_replace 3 ,
.Xr zip_source 3
.Sh HISTORY
.Fn zip_source_zip
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