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1 /* |
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2 |
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3 Copyright (C) 2007 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 the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 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 WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 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 #ifdef 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 #include <string> |
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29 |
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30 #include "oct.h" |
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31 |
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32 template <class LT, class RT> |
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33 /* static */ void |
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34 typecast (const Array<RT>& x, Array<LT>& y) |
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35 { |
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36 octave_idx_type n = x.length (); |
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37 size_t ns = sizeof (RT); |
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38 size_t ms = sizeof (LT); |
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39 |
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40 if (n * ns % ms != 0) |
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41 error ("typecast: incorrect number of input values to make output value"); |
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42 else |
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43 { |
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44 octave_idx_type m = n * ns / ms; |
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45 dim_vector dv = x.dims (); |
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46 for (octave_idx_type i = 0; i < dv.length(); i++) |
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47 if (dv(i) == n) |
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48 { |
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49 dv(i) = m; |
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50 break; |
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51 } |
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52 y.resize (dv); |
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53 const unsigned char *xp |
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54 = reinterpret_cast<const unsigned char *> (x.fortran_vec ()); |
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55 unsigned char *yp = reinterpret_cast<unsigned char *>(y.fortran_vec ()); |
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56 for (octave_idx_type i = 0; |
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57 i < n * static_cast<octave_idx_type>(ns); i++) |
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58 *yp++ = *xp++; |
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59 } |
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60 } |
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61 |
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62 template <class T> |
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63 static octave_value |
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64 typecast (const T& x, std::string type) |
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65 { |
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66 octave_value retval; |
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67 if (type == "uint8") |
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68 { |
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69 uint8NDArray y; |
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70 typecast (x, y); |
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71 retval = octave_value (y); |
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72 } |
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73 else if (type == "uint16") |
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74 { |
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75 uint16NDArray y; |
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76 typecast (x, y); |
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77 retval = octave_value (y); |
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78 } |
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79 else if (type == "uint32") |
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80 { |
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81 uint32NDArray y; |
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82 typecast (x, y); |
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83 retval = octave_value (y); |
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84 } |
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85 else if (type == "uint64") |
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86 { |
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87 uint64NDArray y; |
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88 typecast (x, y); |
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89 retval = octave_value (y); |
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90 } |
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91 else if (type == "int8") |
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92 { |
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93 int8NDArray y; |
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94 typecast (x, y); |
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95 retval = octave_value (y); |
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96 } |
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97 else if (type == "int16") |
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98 { |
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99 int16NDArray y; |
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100 typecast (x, y); |
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101 retval = octave_value (y); |
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102 } |
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103 else if (type == "int32") |
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104 { |
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105 int32NDArray y; |
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106 typecast (x, y); |
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107 retval = octave_value (y); |
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108 } |
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109 else if (type == "int64") |
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110 { |
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111 int64NDArray y; |
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112 typecast (x, y); |
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113 retval = octave_value (y); |
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114 } |
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115 else |
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116 { |
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117 NDArray y; |
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118 typecast (x, y); |
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119 retval = octave_value (y); |
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120 } |
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121 |
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122 return retval; |
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123 } |
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124 |
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125 DEFUN_DLD (typecast, args, , |
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126 " -*- texinfo -*-\n\ |
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127 @deftypefn {Loadable Function} {} typecast (@var{x}, @var{type})\n\ |
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128 Converts from one datatype to another without changing the underlying\n\ |
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129 data. The argument @var{type} defines the type of the return argument\n\ |
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130 and must be one of 'uint8', 'uint16', 'uint32', 'uint64', 'int8', 'int16',\n\ |
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131 'int32', 'int64', 'single' or 'double'.\n\ |
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132 \n\ |
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133 An example of the use of typecast on a little-endian machine is\n\ |
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134 \n\ |
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135 @example\n\ |
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136 @group\n\ |
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137 @var{x} = uint16 ([1, 65535]);\n\ |
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138 typecast (@var{x}, 'uint8')\n\ |
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139 @result{} [ 0, 1, 255, 255]\n\ |
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140 @end group\n\ |
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141 @end example\n\ |
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142 @seealso{cast, swapbytes}\n\ |
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143 @end deftypefn") |
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144 { |
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145 int nargin = args.length (); |
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146 octave_value retval; |
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147 |
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148 if (nargin != 2) |
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149 print_usage (); |
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150 else |
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151 { |
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152 std::string type = args (1).string_value (); |
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153 |
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154 if (! error_state) |
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155 { |
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156 std::transform (type.begin (), type.end (), type.begin (), tolower); |
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157 |
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158 if (type == "single") |
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159 error ("typecast: type 'single' is not supported"); |
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160 else if (type != "uint8" && type != "uint16" |
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161 && type != "uint32" && type != "uint64" |
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162 && type != "int8" && type != "int16" |
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163 && type != "int32" && type != "int64" |
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164 && type != "single" && type != "double") |
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165 error ("typecast: unrecognized or invalid type"); |
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166 else if (args(0).is_sparse_type () || args(0).is_complex_type ()) |
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167 error ("typecast: sparse and complex types are invalid"); |
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168 else |
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169 { |
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170 dim_vector dv = args(0).dims (); |
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171 bool seen = false; |
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172 |
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173 for (octave_idx_type i = 0; i < dv.length(); i++) |
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174 if (dv (i) != 1) |
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175 { |
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176 if (seen) |
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177 { |
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178 error ("typecast: argument must be a vector"); |
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179 break; |
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180 } |
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181 else |
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182 seen = true; |
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183 } |
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184 |
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185 if (!error_state) |
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186 { |
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187 if (args(0).is_uint8_type ()) |
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188 retval = typecast (args(0).uint8_array_value (), type); |
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189 else if (args(0).is_uint16_type ()) |
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190 retval = typecast (args(0).uint16_array_value (), type); |
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191 else if (args(0).is_uint32_type ()) |
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192 retval = typecast (args(0).uint32_array_value (), type); |
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193 else if (args(0).is_uint64_type ()) |
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194 retval = typecast (args(0).uint64_array_value (), type); |
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195 else if (args(0).is_int8_type ()) |
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196 retval = typecast (args(0).int8_array_value (), type); |
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197 else if (args(0).is_int16_type ()) |
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198 retval = typecast (args(0).int16_array_value (), type); |
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199 else if (args(0).is_int32_type ()) |
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200 retval = typecast (args(0).int32_array_value (), type); |
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201 else if (args(0).is_int64_type ()) |
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202 retval = typecast (args(0).int64_array_value (), type); |
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203 else |
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204 retval = typecast (args(0).array_value (), type); |
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205 } |
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206 } |
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207 } |
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208 } |
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209 |
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210 return retval; |
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211 } |
