.TH "ZIP_SOURCE_SEEK_COMPUTE_OFFSET" "3" "December 18, 2017" "NiH" "Library Functions Manual"
.nh
.if n .ad l
.SH "NAME"
\fBzip_source_seek_compute_offset\fR
\- validate arguments and compute offset
.SH "LIBRARY"
libzip (-lzip)
.SH "SYNOPSIS"
\fB#include <zip.h>\fR
.sp
\fIzip_int64_t\fR
.br
.PD 0
.HP 4n
\fBzip_source_seek_compute_offset\fR(\fIzip_uint64_t\ offset\fR, \fIzip_uint64_t\ length\fR, \fIvoid\ *data\fR, \fIzip_uint64_t\ data_length\fR, \fIzip_error_t\ *error\fR);
.PD
.SH "DESCRIPTION"
Use this function to compute the offset for a
\fRZIP_SOURCE_SEEK\fR
or
\fRZIP_SOURCE_SEEK_WRITE\fR
command.
\fIdata\fR
and
\fIdata_length\fR
are the arguments to the source callback,
\fIoffset\fR
is the current offset and
\fIlength\fR
is the length of the source data or, for
\fRZIP_SOURCE_SEEK_WRITE\fR,
the amount of data written.
.SH "RETURN VALUES"
On success, it returns the new offset, on error it returns \-1 and
sets
\fIerror\fR.
.SH "ERRORS"
\fBzip_source_seek_compute_offset\fR()
fails if:
.TP 19n
[\fRZIP_ER_INVAL\fR]
One of the arguments is invalid or the seek would place the offset
outside the data.
.SH "SEE ALSO"
zip_source_function(3)
.SH "HISTORY"
\fBzip_source_seek_compute_offset\fR()
was added in libzip 1.0.
.SH "AUTHORS"
Dieter Baron <\fIdillo@nih.at\fR>
and
Thomas Klausner <\fItk@giga.or.at\fR>