.\" zip_source_file.mdoc -- create data source from a file
.\" Copyright (C) 2004-2008 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 August 1, 2008
.Dt ZIP_SOURCE_FILE 3
.Os
.Sh NAME
.Nm zip_source_file
.Nd create data source from a file
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.Ft struct zip_source *
.Fn zip_source_file "struct zip *archive" "const char *fname" \
"zip_uint64_t start" "zip_int64_t len"
.Sh DESCRIPTION
The function
.Fn zip_source_file
creates a zip source from a file.
.Fn zip_source_file
opens
.Ar fname
and reads
.Ar len
bytes from offset
.Ar start
from it.
If
.Ar len
is 0 or \-1, the whole file (starting from
.Ar start )
is used.
.Pp
The fie is opened and read when the data from the source is used, usually by
.Fn zip_close .
.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_file
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_INVAL
.Ar fname ,
.Ar start ,
or
.Ar len
are invalid.
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.It Bq Er ZIP_ER_OPEN
Opening
.Ar fname
failed.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_add 3 ,
.Xr zip_replace 3 ,
.Xr zip_source_buffer 3 ,
.Xr zip_source_filep 3 ,
.Xr zip_source_free 3 ,
.Xr zip_source_function 3 ,
.Xr zip_source_zip 3
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at