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wsieee754.h
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56 
57 /*
58  *
59  * wsieee754.h
60  *
61  * Author: Markku Rossi <mtr@iki.fi>
62  *
63  * Copyright (c) 2000 WAPIT OY LTD.
64  * All rights reserved.
65  *
66  * Functions to manipulate ANSI/IEEE Std 754-1985 binary floating-point
67  * numbers.
68  *
69  */
70 
71 #ifndef WSIEEE754_H
72 #define WSIEEE754_H
73 
74 /********************* Types and definitions ****************************/
75 
76 /* Return codes for encoding and decoding functions. */
77 typedef enum
78 {
79  /* The operation was successful. */
81 
82  /* The value is `Not a Number' NaN. */
84 
85  /* The valueis positive infinity. */
87 
88  /* The value is negative infinity. */
91 
92 /********************* Special values ***********************************/
93 
94 /* `Not a Number' NaN */
95 extern unsigned char ws_ieee754_nan[4];
96 
97 /* Positive infinity. */
98 extern unsigned char ws_ieee754_positive_inf[4];
99 
100 /* Positive infinity. */
101 extern unsigned char ws_ieee754_negative_inf[4];
102 
103 /********************* Global functions *********************************/
104 
105 /* Encode the floating point number `value' to the IEEE-754 single
106  precision format. The function stores the encoded value to the
107  buffer `buf'. The buffer `buf' must have 32 bits (4 bytes) of
108  space. The function returns WsIeee754Result return value. It
109  describes the format of the encoded value in `buf'. In all cases,
110  the function generates the corresponding encoded value to the
111  buffer `buf'. */
112 WsIeee754Result ws_ieee754_encode_single(double value, unsigned char *buf);
113 
114 /* Decode the IEEE-754 encoded number `buf' into a floating point
115  number. The argument `buf' must have 32 bits of data. The
116  function returns a result code which describes the success of the
117  decode operation. If the result is WS_IEEE754_OK, the resulting
118  floating point number is returned in `value_return'. */
119 WsIeee754Result ws_ieee754_decode_single(unsigned char *buf,
120  double *value_return);
121 
122 /* Get the sign bit from the IEEE-754 single format encoded number
123  `buf'. The buffer `buf' must have 32 bits of data. */
124 WsUInt32 ws_ieee754_single_get_sign(unsigned char *buf);
125 
126 /* Get the exponent from the IEEE-754 single format encoded number
127  `buf'. The buffer `buf' must have 32 bits of data. The returned
128  value is the biased exponent. */
129 WsUInt32 ws_ieee754_single_get_exp(unsigned char *buf);
130 
131 /* Get the mantissa from the IEEE-754 single format encoded number
132  `buf'. The buffer `buf' must have 32 bits of data. */
133 WsUInt32 ws_ieee754_single_get_mant(unsigned char *buf);
134 
135 #endif /* not WSIEEE754_H */
unsigned long WsUInt32
Definition: wsint.h:122
unsigned char ws_ieee754_nan[4]
Definition: wsieee754.c:86
WsIeee754Result ws_ieee754_decode_single(unsigned char *buf, double *value_return)
Definition: wsieee754.c:199
WsUInt32 ws_ieee754_single_get_exp(unsigned char *buf)
Definition: wsieee754.c:262
WsIeee754Result
Definition: wsieee754.h:77
WsUInt32 ws_ieee754_single_get_mant(unsigned char *buf)
Definition: wsieee754.c:273
unsigned char ws_ieee754_negative_inf[4]
Definition: wsieee754.c:90
unsigned char ws_ieee754_positive_inf[4]
Definition: wsieee754.c:88
WsUInt32 ws_ieee754_single_get_sign(unsigned char *buf)
Definition: wsieee754.c:256
WsIeee754Result ws_ieee754_encode_single(double value, unsigned char *buf)
Definition: wsieee754.c:94
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