/*
* Copyright (c) 2010 Apple Inc. All rights reserved.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of its
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* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* (c) Copyright 1989-1993 OPEN SOFTWARE FOUNDATION, INC.
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* 2. Redistributions in binary form must reproduce the above copyright
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* may be used to endorse or promote products derived from this
* this software without specific prior written permission.
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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*/
/*
**
** NAME:
**
** upkieees.c.h
**
** FACILITY:
**
** IDL Stub Runtime Support
**
** ABSTRACT:
**
** This module contains code to extract information from a IEEE
** single floating number and to initialize an UNPACKED_REAL structure
** with those bits.
**
** This module is meant to be used as an include file.
**
** VERSION: DCE 1.0
**
*/
#if HAVE_CONFIG_H
#include
#endif
/*
**++
** Functional Description:
**
** This module contains code to extract information from a IEEE
** single floating number and to initialize an UNPACKED_REAL structure
** with those bits.
**
** See the header files for a description of the UNPACKED_REAL
** structure.
**
** A normalized IEEE single precision floating number looks like:
**
** Sign bit, 8 exp bits (bias 127), 23 fraction bits
**
** 1.0 <= fraction < 2.0, MSB implicit
**
** For more details see "Mips R2000 Risc Architecture"
** by Gerry Kane, page 6-8 or ANSI/IEEE Std 754-1985.
**
**
** Implicit parameters:
**
** options: a word of flags, see include files.
**
** input_value: a pointer to the input parameter.
**
** r: an UNPACKED_REAL structure.
**
** i: a temporary integer variable.
**
**--
*/
#if (NDR_LOCAL_INT_REP == ndr_c_int_big_endian)
memcpy(&r[1], input_value, 4);
#else
if (options & CVT_C_BIG_ENDIAN) {
memcpy(r, input_value, 4);
/* Shuffle bytes to little endian format */
r[1] = ((r[0] << 24) | (r[0] >> 24));
r[1] |= ((r[0] << 8) & 0x00FF0000L);
r[1] |= ((r[0] >> 8) & 0x0000FF00L);
} else {
memcpy(&r[1], input_value, 4);
}
#endif
/* Initialize FLAGS and perhaps set NEGATIVE bit */
r[U_R_FLAGS] = (r[1] >> 31);
/* Extract biased exponent */
r[U_R_EXP] = (r[1] >> 23) & 0x000000FFL;
/* Check for denormalized values */
if (r[U_R_EXP] == 0) {
/* Clear sign bit */
r[1] &= 0x7FFFFFFFL;
/* If fraction is non-zero then normalize it */
if (r[1]) {
/* Count leading zeros */
i = 0;
while (!(r[1] & 0x00400000L)) {
r[1] <<= 1;
i += 1;
}
/* Adjust exponent and normalize fraction */
r[U_R_EXP] = U_R_BIAS - 126 - i;
r[1] <<= 9;
/* Clear uninitialized part of unpacked real */
r[2] = 0;
r[3] = 0;
r[4] = 0;
} else {
r[U_R_FLAGS] |= U_R_ZERO;
}
/* Check for NANs and INFINITIES */
} else if (r[U_R_EXP] == 255) {
/* Clear sign and exponent */
r[1] &= 0x007FFFFFL;
if (r[1])
r[U_R_FLAGS] |= U_R_INVALID;
else
r[U_R_FLAGS] |= U_R_INFINITY;
} else {
/* Adjust exponent bias */
r[U_R_EXP] += (U_R_BIAS - 126);
/* Set hidden bit */
r[1] |= 0x00800000L;
/* Left justify fraction bits */
r[1] <<= 8;
/* Clear uninitialized part of unpacked real */
r[2] = 0;
r[3] = 0;
r[4] = 0;
}