Index Page TOBIN User's Guide

## Table of Contents

       TOBIN User's Guide
          Abstract
          Summary
          Particulars
             Examples
          Note about DAF and DAS Run-Time Binary File Format Translation
       Appendix A --- Revision History
             2017 MAR 23 by N. J. Bachman
             2002 DEC 06 by B. V. Semenov.

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# TOBIN User's Guide

Last revised on 2017 MAR 23 by N. J. Bachman

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## Abstract

TOBIN is a command-line program that converts transfer format SPK, CK, PCK, DSK and EK files to binary format.

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## Summary

TOBIN is a utility program providing command line, or ``batch,'' oriented method for converting portable transfer files into SPICE binary kernel files. The name ``tobin'' is obviously derived from ``to binary,'' as in ``convert to binary''.

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## Particulars

TOBIN converts a SPICE transfer format file into it's binary format for use in a particular computing environment. TOBIN requires at least the name of the input transfer file, which is the first argument on the command line. Optionally, a name for the output binary file may be specified as the second argument on the command line. If a name for the output file is provided it overrides the automatic naming conventions used by the program.

If only the name of the input transfer file is provided on the command line, TOBIN will generate a name for the output binary kernel file that has the same base name as the input transfer file and an appropriate filename extension, based on the filename extension of the transfer file. If TOBIN does not recognize the filename extension of the input transfer file, or there is no filename extension on the input transfer file, a filename extension of '.bin' will be used as the filename extension of the output binary file. If a file having the same name as the output file already exists, TOBIN signals an error and stops. We assume that it is bad form to overwrite or replace an existing file.

TOBIN recognizes the transfer filename extensions ``.xc'', ``.xee'', ``.xpc'', and ``.xsp'' associated with transfer files for SPICE data products. These are converted to the SPICE binary kernel filename extensions ``.bc'', ``.bee'', ``.bpc'', and ``.bsp,'' respectively. Also recognized are the old transfer file extensions ``.tc'', ``.tee'', ``.tpc'', and ``.tsp,'' which are converted into the appropriate filename extensions for a binary kernel file.

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### Examples

TOBIN requires the name of the file to be converted and, optionally, the name of the file to be produced, e.g.,

       prompt > tobin thisfile.xsp

and

       prompt > tobin thisfile.xsp thisfile.bsp

would both produce the file `thisfile.bsp' in the current directory.

In the first example, the name for the binary file produced is derived from the name of the transfer file, using the full base name and replacing the letter `x' in the file name extension with the letter `b', to indicate that the file is a binary file. In the second example, the name for the binary file produced is taken directly from the command line.

`--` Example 1: Convert the transfer file 'ephem.xsp' into a binary kernel file.

                > tobin ephem.xsp

`` This will create the binary kernel file 'ephem.bsp'.

`--` Example 2: This is the same as Example 1, except we explicitly set the output filename on the command line.

                > tobin ephem.xsp myephem.bsp

`` This will create the binary kernel file 'myephem.bsp'.

`--` Example 3: For this example, we provide a filename extension on the input transfer file that TOBIN does not recognize.

                > tobin mydata.ttt

`` This will create the binary file 'mydata.bin'.

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## Note about DAF and DAS Run-Time Binary File Format Translation

Starting with the N0052 release of the SPICE Toolkit (January, 2002) certain supported platforms are able to read DAF-based binary files (SPK, CK and binary PCK) that were written using a different, or non-native, binary representation. This capability eliminated the need to use transfer format to move DAF-based files between some of the platforms.

Starting with the N0066 release of the SPICE Toolkit (April, 2017), SPICE performs run-time translation of non-native binary DAS files.

Both DAF and DAS files having big-endian IEEE format can be read on platforms using the little-endian IEEE format, and vice versa.

Refer to the Convert User's Guide (convert.ug) to see if using transfer format files is indeed necessary in your data exchange path.

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# Appendix A --- Revision History

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### 2017 MAR 23 by N. J. Bachman

Updated to state that TOBIN works on binary PCK and DSK files. The section on run-time translation was updated to state that run-time translation works for DAS files as well as DAF files.

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### 2002 DEC 06 by B. V. Semenov.