NAME

     zip_source_seek_compute_offset — validate arguments and compute offset

LIBRARY

     libzip (-lzip)

SYNOPSIS

     #include <zip.h>

     zip_int64_t
     zip_source_seek_compute_offset(zip_uint64_t offset, zip_uint64_t length, void *data,
         zip_uint64_t data_length, zip_error_t *error);

DESCRIPTION

     Use this function to compute the offset for a ZIP_SOURCE_SEEK or ZIP_SOURCE_SEEK_WRITE
     command.  data and data_length are the arguments to the source callback, offset is the
     current offset and length is the length of the source data or, for ZIP_SOURCE_SEEK_WRITE,
     the amount of data written.

RETURN VALUES

     On success, it returns the new offset, on error it returns -1 and sets error.

ERRORS

     zip_source_seek_compute_offset() fails if:

     [ZIP_ER_INVAL]     One of the arguments is invalid or the seek would place the offset
                        outside the data.

SEE ALSO

     zip_source_function(3)

HISTORY

     zip_source_seek_compute_offset() was added in libzip 1.0.

AUTHORS

     Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>