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d4file(4) Kernel Interfaces Manual d4file(4) NAME d4file - D4-format binary file SYNOPSIS d4file DESCRIPTION The universal file format for storing the list of 4-tuple data. The file is called "D4-format file". D4-format file consists of two parts. A header with 256byte data is put on the head of file; a magic number for recognizing file format, an attribute code, the number of data, lower- and higher-limit of data are held in the header. Data part follows the header; list of 4-tuple data, the quadruple of 2-byte-integers (short), are put in the data part. Bit- and byte-order are MSB-first (big-endian). The file header is defined by the following structure. struct d4file { char d4_magic[8]; /* = "DATA0004" */ int32 d4_attrb; /* = 0 */ int32 d4_count; /* = 0 */ short d4_llimit[4]; /* lower limit of each member */ short d4_hlimit[4]; /* higher limit of each member */ short d4_spc[48]; /* (filler) */ }; d4_magic field is always filled with string "DATA0004". d4_attrb holds the attribute code of file. The attribute code is always 0. d4_count holds the number of 4-tuple data. If this field is not used, con- stant 0 is set. d4_llimit and d4_hlimit arrays hold lower- and higher-limits of 4-tuple data respectively. d4_spc array is a dummy field, which is filled with zeros. Each 4-tuple data is defined by the following structure. struct d4pac { short d4_data[4]; }; The real value held in d4_data can be either signed 2byte-integer (short) and unsigned 2byte-integer (unsigned short). The selection of the type de- pends on its application. AUTHOR Copyright (C) 1995-1997 Hideaki Goto E-Mail: hgot@ecip.tohoku.ac.jp, hgot@aso.ecei.tohoku.ac.jp July 1997 d4file(4)
NAME | SYNOPSIS | DESCRIPTION | AUTHOR
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