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annotate libinterp/corefcn/hex2num.cc @ 23220:092078913d54

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maint: Merge stable to default.
author John W. Eaton <jwe@octave.org>
date Wed, 22 Feb 2017 12:58:07 -0500
parents ef4d915df748 3ac9f9ecfae5
children ef20eee0247d
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1 /*
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2
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3 Copyright (C) 2008-2017 David Bateman
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (HAVE_CONFIG_H)
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24 # include "config.h"
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25 #endif
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26
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27 #include <algorithm>
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28
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29 #include "defun.h"
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30 #include "error.h"
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31 #include "errwarn.h"
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32 #include "ovl.h"
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33 #include "utils.h"
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34
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35 DEFUN (hex2num, args, ,
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36 doc: /* -*- texinfo -*-
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37 @deftypefn {} {@var{n} =} hex2num (@var{s})
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38 @deftypefnx {} {@var{n} =} hex2num (@var{s}, @var{class})
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39 Typecast the 16 character hexadecimal character string to an IEEE 754
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40 double precision number.
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41
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42 If fewer than 16 characters are given the strings are right padded with
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43 @qcode{'0'} characters.
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44
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45 Given a string matrix, @code{hex2num} treats each row as a separate number.
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46
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47 @example
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48 @group
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49 hex2num (["4005bf0a8b145769"; "4024000000000000"])
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50 @result{} [2.7183; 10.000]
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51 @end group
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52 @end example
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53
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54 The optional argument @var{class} can be passed as the string
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55 @qcode{"single"} to specify that the given string should be interpreted as
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56 a single precision number. In this case, @var{s} should be an 8 character
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57 hexadecimal string. For example:
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58
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59 @example
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60 @group
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61 hex2num (["402df854"; "41200000"], "single")
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62 @result{} [2.7183; 10.000]
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63 @end group
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64 @end example
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65 @seealso{num2hex, hex2dec, dec2hex}
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66 @end deftypefn */)
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67 {
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68 int nargin = args.length ();
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69
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70 if (nargin < 1 || nargin > 2)
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71 print_usage ();
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72
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73 if (nargin == 2 && ! args(1).is_string ())
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74 error ("hex2num: CLASS must be a string");
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75
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76 const charMatrix cmat = args(0).char_matrix_value ();
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77 std::string prec = (nargin == 2) ? args(1).string_value () : "double";
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78 bool is_single = (prec == "single");
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79 octave_idx_type nchars = (is_single) ? 8 : 16;
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80
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81 if (cmat.columns () > nchars)
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82 error ("hex2num: S must be no more than %d characters", nchars);
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83 else if (prec != "double" && prec != "single")
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84 error ("hex2num: CLASS must be either \"double\" or \"single\"");
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85
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86 octave_value retval;
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87 octave_idx_type nr = cmat.rows ();
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88 octave_idx_type nc = cmat.columns ();
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89
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90 if (is_single)
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91 {
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92 FloatColumnVector m (nr);
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93
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94 for (octave_idx_type i = 0; i < nr; i++)
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95 {
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96 union
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97 {
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98 uint32_t ival;
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99 float dval;
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100 } num;
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101
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102 num.ival = 0;
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103
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104 for (octave_idx_type j = 0; j < nc; j++)
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105 {
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106 unsigned char ch = cmat.elem (i, j);
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107
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108 if (! isxdigit (ch))
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109 error ("hex2num: illegal character found in string S");
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110
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111 num.ival <<= 4;
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112 if (ch >= 'a')
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113 num.ival += static_cast<uint32_t> (ch - 'a' + 10);
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114 else if (ch >= 'A')
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115 num.ival += static_cast<uint32_t> (ch - 'A' + 10);
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116 else
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117 num.ival += static_cast<uint32_t> (ch - '0');
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118 }
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119
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120 if (nc < nchars)
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121 num.ival <<= (nchars - nc) * 4;
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122
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123 m(i) = num.dval;
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124 }
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125
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126 retval = m;
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127 }
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128 else
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129 {
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130 ColumnVector m (nr);
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131
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132 for (octave_idx_type i = 0; i < nr; i++)
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133 {
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134 union
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135 {
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136 uint64_t ival;
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137 double dval;
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138 } num;
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139
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140 num.ival = 0;
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141
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142 for (octave_idx_type j = 0; j < nc; j++)
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143 {
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144 unsigned char ch = cmat.elem (i, j);
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145
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146 if (! isxdigit (ch))
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147 error ("hex2num: illegal character found in string S");
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148
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149 num.ival <<= 4;
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150 if (ch >= 'a')
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151 num.ival += static_cast<uint64_t> (ch - 'a' + 10);
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152 else if (ch >= 'A')
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153 num.ival += static_cast<uint64_t> (ch - 'A' + 10);
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154 else
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155 num.ival += static_cast<uint64_t> (ch - '0');
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156 }
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157
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158 if (nc < nchars)
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159 num.ival <<= (nchars - nc) * 4;
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160
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161 m(i) = num.dval;
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162 }
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163
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3d60ed163b70 maint: Eliminate bad spacing around '='.
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164 retval = m;
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165 }
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166
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167 return retval;
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168 }
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169
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170 /*
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171 %!assert (hex2num (["c00";"bff";"000";"3ff";"400"]), [-2:2]')
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172 %!assert (hex2num (["c00";"bf8";"000";"3f8";"400"], "single"), single([-2:2])')
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173 */
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174
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175 DEFUN (num2hex, args, ,
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176 doc: /* -*- texinfo -*-
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177 @deftypefn {} {@var{s} =} num2hex (@var{n})
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178 Typecast a double or single precision number or vector to a 8 or 16
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179 character hexadecimal string of the IEEE 754 representation of the number.
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180
112b20240c87 move docstrings in C++ files out of C strings and into comments
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181 For example:
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182
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183 @example
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184 @group
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185 num2hex ([-1, 1, e, Inf])
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186 @result{} "bff0000000000000
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187 3ff0000000000000
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188 4005bf0a8b145769
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189 7ff0000000000000"
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190 @end group
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191 @end example
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192
112b20240c87 move docstrings in C++ files out of C strings and into comments
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193 If the argument @var{n} is a single precision number or vector, the returned
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diff changeset
194 string has a length of 8. For example:
112b20240c87 move docstrings in C++ files out of C strings and into comments
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195
112b20240c87 move docstrings in C++ files out of C strings and into comments
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196 @example
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197 @group
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198 num2hex (single ([-1, 1, e, Inf]))
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199 @result{} "bf800000
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200 3f800000
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201 402df854
112b20240c87 move docstrings in C++ files out of C strings and into comments
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202 7f800000"
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203 @end group
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204 @end example
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205 @seealso{hex2num, hex2dec, dec2hex}
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206 @end deftypefn */)
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207 {
20819
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diff changeset
208 if (args.length () != 1)
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209 print_usage ();
20802
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210
21839
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
Mike Miller <mtmiller@octave.org>
parents: 21724
diff changeset
211 if (args(0).is_complex_type ())
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
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diff changeset
212 error ("num2hex: N must be real");
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
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diff changeset
213
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diff changeset
214 octave_value retval;
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diff changeset
215
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diff changeset
216 if (args(0).is_single_type ())
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diff changeset
217 {
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diff changeset
218 const FloatColumnVector v (args(0).float_vector_value ());
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diff changeset
219
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220 octave_idx_type nchars = 8;
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221 octave_idx_type nr = v.numel ();
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222 charMatrix m (nr, nchars);
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diff changeset
223 const float *pv = v.fortran_vec ();
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diff changeset
224
20678
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225 for (octave_idx_type i = 0; i < nr; i++)
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226 {
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227 union
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228 {
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diff changeset
229 uint32_t ival;
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diff changeset
230 float dval;
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diff changeset
231 } num;
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232
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diff changeset
233 num.dval = *pv++;
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diff changeset
234
20678
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235 for (octave_idx_type j = 0; j < nchars; j++)
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diff changeset
236 {
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diff changeset
237 unsigned char ch =
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diff changeset
238 static_cast<char>(num.ival >> ((nchars - 1 - j) * 4) & 0xF);
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diff changeset
239 if (ch >= 10)
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diff changeset
240 ch += 'a' - 10;
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241 else
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242 ch += '0';
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diff changeset
243
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244 m.elem (i, j) = ch;
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245 }
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246 }
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diff changeset
247
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248 retval = m;
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diff changeset
249 }
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250 else
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diff changeset
251 {
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252 const ColumnVector v (args(0).vector_value ());
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253
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254 octave_idx_type nchars = 16;
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diff changeset
255 octave_idx_type nr = v.numel ();
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diff changeset
256 charMatrix m (nr, nchars);
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257 const double *pv = v.fortran_vec ();
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258
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259 for (octave_idx_type i = 0; i < nr; i++)
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260 {
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diff changeset
261 union
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262 {
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diff changeset
263 uint64_t ival;
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diff changeset
264 double dval;
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diff changeset
265 } num;
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266
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diff changeset
267 num.dval = *pv++;
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268
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269 for (octave_idx_type j = 0; j < nchars; j++)
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270 {
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diff changeset
271 unsigned char ch =
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272 static_cast<char>(num.ival >> ((nchars - 1 - j) * 4) & 0xF);
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273 if (ch >= 10)
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274 ch += 'a' - 10;
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275 else
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276 ch += '0';
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277
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278 m.elem (i, j) = ch;
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279 }
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280 }
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281
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282 retval = m;
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283 }
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284
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David Bateman <dbateman@free.fr>
parents:
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285 return retval;
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David Bateman <dbateman@free.fr>
parents:
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286 }
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David Bateman <dbateman@free.fr>
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287
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David Bateman <dbateman@free.fr>
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288 /*
14501
60e5cf354d80 Update %!tests in DLD-FUNCTIONS/ directory with Octave coding conventions.
Rik <octave@nomad.inbox5.com>
parents: 14360
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289 %!assert (num2hex (-2:2), ["c000000000000000";"bff0000000000000";"0000000000000000";"3ff0000000000000";"4000000000000000"])
17177
81d3c4409645 num2hex: Handle single precision argument correctly (bug #39607)
Mike Miller <mtmiller@ieee.org>
parents: 15195
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290 %!assert (num2hex (single (-2:2)), ["c0000000";"bf800000";"00000000";"3f800000";"40000000"])
21839
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
Mike Miller <mtmiller@octave.org>
parents: 21724
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291
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
Mike Miller <mtmiller@octave.org>
parents: 21724
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292 %!error num2hex ()
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
Mike Miller <mtmiller@octave.org>
parents: 21724
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293 %!error num2hex (1,2)
6b4f6339df91 num2hex: Report an error on complex arguments (bug #48184)
Mike Miller <mtmiller@octave.org>
parents: 21724
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294 %!error num2hex (1j)
8808
d724487d2c4b hex2num.cc: use union to avoid cast and GCC warning
John W. Eaton <jwe@octave.org>
parents: 8807
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295 */