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Neither Open Software * Foundation, Inc., Hewlett-Packard Company nor Digital * Equipment Corporation makes any representations about the suitability * of this software for any purpose. * * Copyright (c) 2007, Novell, Inc. All rights reserved. * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Novell Inc. nor the names of its contributors * may be used to endorse or promote products derived from this * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * @APPLE_LICENSE_HEADER_END@ */ /* ** ** 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 <config.h> #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; }