![]() Though the data were segregated into three separate, possibly empty, Subsystem enables application programs to view data in a DAS file as The acronym ``DAS'' stands for ``direct access, segregated.'' The DAS Support for character, double precision, and integer data types Simple interface-data is referenced by ``logical address'' In addition, because filesĬonforming to the new format are also DAS files, they inherit the ![]() Thus a great deal of the design, coding,ĭocumentation and testing that accompanies the development of new access Reading, writing, and porting files having the new format-can be built That most of the new access routines-the new code needed to support The principal advantage of building a new file format based on DAS is Serve as a foundation for these high-level formats, providing servicesĪnd capabilities required by all of them. Simple way to create and efficiently use their own portable, high-level,īinary, direct access file formats. The purpose of the DAS subsystem is to provide SPICELIB users with a The SPICELIB ``DAS'' subsystem consists of a Fortran 77 direct accessįile architecture and a set of subroutines that make it convenient toĬreate, read, annotate, and transport files having this architecture. The following documents pertinent to DAS usage are included in the SPICE Users of SPICE kernels based on the DAS formatĬan find documentation for those kernels in the Required Reading for the It isĪlso for sophisticated SPICE users who wish to create their ownĭAS-based file formats. Segment-oriented Digital Shape Kernel (DSK) interface routines. This document is intended for SPICE users who need to use lower-level, This document currently discusses only the Fortran version of the SPICEįor a given platform, DAS files used by the Fortran, C, IDL, and MATLAB SPICE DSK, EKĪnd DBK files, and type 1 star catalogs use the DAS architecture and The ``Direct Access Segregated'' (DAS) SPICE file architecture storesĪrrays of integer, double precision, and character data. DAS Required Reading Abstract Notes for Fortran Users Intended audience Related Documents Introduction DAS Concepts Logical Addresses Read and Write Access Access to Non-Native DAS Files File Handles The DAS Comment Area Internal File Names Binary and Transfer DAS files Buffering Using Multiple DAS Files Concurrently DAS vs DAF Using the DAS Subsystem Creating a New DAS File Writing DAS Files Writing to an Existing DAS file Reading DAS Files Converting Between Binary and Transfer Format Annotating DAS Files Mapping Between Handles, File Names, and Units Obtaining a DAS File Summary Using Scratch DAS Files DAS Architecture Overview of DAS Architecture The File Record Reserved Records Comment Records Directory Records Data Records DAS Routines Summary of Mnemonics Summary of Calling Sequences Examples Storing a Symbol Table in a DAS File Appendix A - Revision History 2021 DEC 31 by B.
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