d4file(4)d4file(4)NAMEd4file - D4-format binary file
SYNOPSISd4fileDESCRIPTION
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 follow‐
ing 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,
constant 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 depends 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)
