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  25 <div class="section">
  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="spirit.qi.reference.binary.binary_little"></a><a class="link" href="binary_little.html" title="Binary Little Endianness Parser">Binary
  28           Little Endianness Parser</a>
  29 </h5></div></div></div>
  30 <h6>
  31 <a name="spirit.qi.reference.binary.binary_little.h0"></a>
  32             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.description"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.description">Description</a>
  33           </h6>
  34 <p>
  35             Binary little endian parsers are designed to parse binary byte streams
  36             that are laid out in little endian.
  37           </p>
  38 <h6>
  39 <a name="spirit.qi.reference.binary.binary_little.h1"></a>
  40             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.header"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.header">Header</a>
  41           </h6>
  42 <pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/qi/binary.hpp&gt;</span>
  43 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_binary</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  44 </pre>
  45 <p>
  46             Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>.
  47           </p>
  48 <h6>
  49 <a name="spirit.qi.reference.binary.binary_little.h2"></a>
  50             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.namespace"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.namespace">Namespace</a>
  51           </h6>
  52 <div class="informaltable"><table class="table">
  53 <colgroup><col></colgroup>
  54 <thead><tr><th>
  55                     <p>
  56                       Name
  57                     </p>
  58                   </th></tr></thead>
  59 <tbody>
  60 <tr><td>
  61                     <p>
  62                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">little_word</span> <span class="comment">//
  63                       alias: boost::spirit::qi::little_word</span></code>
  64                     </p>
  65                   </td></tr>
  66 <tr><td>
  67                     <p>
  68                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">little_dword</span> <span class="comment">//
  69                       alias: boost::spirit::qi::little_dword</span></code>
  70                     </p>
  71                   </td></tr>
  72 <tr><td>
  73                     <p>
  74                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">little_qword</span> <span class="comment">//
  75                       alias: boost::spirit::qi::little_qword</span></code>
  76                     </p>
  77                   </td></tr>
  78 <tr><td>
  79                     <p>
  80                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">little_bin_float</span> <span class="comment">//
  81                       alias: boost::spirit::qi::little_bin_float</span></code>
  82                     </p>
  83                   </td></tr>
  84 <tr><td>
  85                     <p>
  86                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">little_bin_double</span> <span class="comment">//
  87                       alias: boost::spirit::qi::little_bin_double</span></code>
  88                     </p>
  89                   </td></tr>
  90 </tbody>
  91 </table></div>
  92 <div class="note"><table border="0" summary="Note">
  93 <tr>
  94 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td>
  95 <th align="left">Note</th>
  96 </tr>
  97 <tr><td align="left" valign="top"><p>
  98               <code class="computeroutput"><span class="identifier">little_qword</span></code> is only
  99               available on platforms where the preprocessor constant <code class="computeroutput"><span class="identifier">BOOST_HAS_LONG_LONG</span></code> is defined (i.e.
 100               on platforms having native support for <code class="computeroutput"><span class="keyword">unsigned</span>
 101               <span class="keyword">long</span> <span class="keyword">long</span></code>
 102               (64 bit) integer types).
 103             </p></td></tr>
 104 </table></div>
 105 <h6>
 106 <a name="spirit.qi.reference.binary.binary_little.h3"></a>
 107             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.model_of"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.model_of">Model of</a>
 108           </h6>
 109 <div class="blockquote"><blockquote class="blockquote"><p>
 110               <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>
 111             </p></blockquote></div>
 112 <div class="variablelist">
 113 <p class="title"><b>Notation</b></p>
 114 <dl class="variablelist">
 115 <dt><span class="term"><code class="computeroutput"><span class="identifier">w</span></code></span></dt>
 116 <dd><p>
 117                   A 16 bit binary value or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
 118                   Argument</a> that evaluates to a 16 bit binary value. This value
 119                   is always in native endian.
 120                 </p></dd>
 121 <dt><span class="term"><code class="computeroutput"><span class="identifier">dw</span></code></span></dt>
 122 <dd><p>
 123                   A 32 bit binary value or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
 124                   Argument</a> that evaluates to a 32 bit binary value. This value
 125                   is always in native endian.
 126                 </p></dd>
 127 <dt><span class="term"><code class="computeroutput"><span class="identifier">qw</span></code></span></dt>
 128 <dd><p>
 129                   A 64 bit binary value or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
 130                   Argument</a> that evaluates to a 64 bit binary value. This value
 131                   is always in native endian.
 132                 </p></dd>
 133 <dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
 134 <dd><p>
 135                   A float binary value or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
 136                   Argument</a> that evaluates to a float binary value. This value
 137                   is always in native endian.
 138                 </p></dd>
 139 <dt><span class="term"><code class="computeroutput"><span class="identifier">d</span></code></span></dt>
 140 <dd><p>
 141                   A double binary value or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy
 142                   Argument</a> that evaluates to a double binary value. This value
 143                   is always in native endian.
 144                 </p></dd>
 145 </dl>
 146 </div>
 147 <h6>
 148 <a name="spirit.qi.reference.binary.binary_little.h4"></a>
 149             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.expression_semantics"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.expression_semantics">Expression
 150             Semantics</a>
 151           </h6>
 152 <p>
 153             Semantics of an expression is defined only where it differs from, or
 154             is not defined in <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>.
 155           </p>
 156 <div class="informaltable"><table class="table">
 157 <colgroup>
 158 <col>
 159 <col>
 160 </colgroup>
 161 <thead><tr>
 162 <th>
 163                     <p>
 164                       Expression
 165                     </p>
 166                   </th>
 167 <th>
 168                     <p>
 169                       Description
 170                     </p>
 171                   </th>
 172 </tr></thead>
 173 <tbody>
 174 <tr>
 175 <td>
 176                     <p>
 177                       <code class="computeroutput"><span class="identifier">little_word</span></code>
 178                     </p>
 179                   </td>
 180 <td>
 181                     <p>
 182                       Matches any 16 bit little endian binary.
 183                     </p>
 184                   </td>
 185 </tr>
 186 <tr>
 187 <td>
 188                     <p>
 189                       <code class="computeroutput"><span class="identifier">little_dword</span></code>
 190                     </p>
 191                   </td>
 192 <td>
 193                     <p>
 194                       Matches any 32 bit little endian binary.
 195                     </p>
 196                   </td>
 197 </tr>
 198 <tr>
 199 <td>
 200                     <p>
 201                       <code class="computeroutput"><span class="identifier">little_qword</span></code>
 202                     </p>
 203                   </td>
 204 <td>
 205                     <p>
 206                       Matches any 64 bit little endian binary.
 207                     </p>
 208                   </td>
 209 </tr>
 210 <tr>
 211 <td>
 212                     <p>
 213                       <code class="computeroutput"><span class="identifier">little_bin_float</span></code>
 214                     </p>
 215                   </td>
 216 <td>
 217                     <p>
 218                       Matches any float little endian binary.
 219                     </p>
 220                   </td>
 221 </tr>
 222 <tr>
 223 <td>
 224                     <p>
 225                       <code class="computeroutput"><span class="identifier">little_bin_double</span></code>
 226                     </p>
 227                   </td>
 228 <td>
 229                     <p>
 230                       Matches any double little endian binary.
 231                     </p>
 232                   </td>
 233 </tr>
 234 <tr>
 235 <td>
 236                     <p>
 237                       <code class="computeroutput"><span class="identifier">little_word</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span></code>
 238                     </p>
 239                   </td>
 240 <td>
 241                     <p>
 242                       Matches an exact 16 bit little endian binary.
 243                     </p>
 244                   </td>
 245 </tr>
 246 <tr>
 247 <td>
 248                     <p>
 249                       <code class="computeroutput"><span class="identifier">little_dword</span><span class="special">(</span><span class="identifier">dw</span><span class="special">)</span></code>
 250                     </p>
 251                   </td>
 252 <td>
 253                     <p>
 254                       Matches an exact 32 bit little endian binary.
 255                     </p>
 256                   </td>
 257 </tr>
 258 <tr>
 259 <td>
 260                     <p>
 261                       <code class="computeroutput"><span class="identifier">little_qword</span><span class="special">(</span><span class="identifier">qw</span><span class="special">)</span></code>
 262                     </p>
 263                   </td>
 264 <td>
 265                     <p>
 266                       Matches an exact 32 bit little endian binary.
 267                     </p>
 268                   </td>
 269 </tr>
 270 <tr>
 271 <td>
 272                     <p>
 273                       <code class="computeroutput"><span class="identifier">little_bin_float</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
 274                     </p>
 275                   </td>
 276 <td>
 277                     <p>
 278                       Matches an exact float little endian binary.
 279                     </p>
 280                   </td>
 281 </tr>
 282 <tr>
 283 <td>
 284                     <p>
 285                       <code class="computeroutput"><span class="identifier">little_bin_double</span><span class="special">(</span><span class="identifier">d</span><span class="special">)</span></code>
 286                     </p>
 287                   </td>
 288 <td>
 289                     <p>
 290                       Matches an exact double little endian binary.
 291                     </p>
 292                   </td>
 293 </tr>
 294 </tbody>
 295 </table></div>
 296 <h6>
 297 <a name="spirit.qi.reference.binary.binary_little.h5"></a>
 298             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.attributes"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.attributes">Attributes</a>
 299           </h6>
 300 <div class="informaltable"><table class="table">
 301 <colgroup>
 302 <col>
 303 <col>
 304 </colgroup>
 305 <thead><tr>
 306 <th>
 307                     <p>
 308                       Expression
 309                     </p>
 310                   </th>
 311 <th>
 312                     <p>
 313                       Attribute
 314                     </p>
 315                   </th>
 316 </tr></thead>
 317 <tbody>
 318 <tr>
 319 <td>
 320                     <p>
 321                       <code class="computeroutput"><span class="identifier">little_word</span></code>
 322                     </p>
 323                   </td>
 324 <td>
 325                     <p>
 326                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint_least16_t</span></code>
 327                     </p>
 328                   </td>
 329 </tr>
 330 <tr>
 331 <td>
 332                     <p>
 333                       <code class="computeroutput"><span class="identifier">little_dword</span></code>
 334                     </p>
 335                   </td>
 336 <td>
 337                     <p>
 338                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint_least32_t</span></code>
 339                     </p>
 340                   </td>
 341 </tr>
 342 <tr>
 343 <td>
 344                     <p>
 345                       <code class="computeroutput"><span class="identifier">little_qword</span></code>
 346                     </p>
 347                   </td>
 348 <td>
 349                     <p>
 350                       <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint_least64_t</span></code>
 351                     </p>
 352                   </td>
 353 </tr>
 354 <tr>
 355 <td>
 356                     <p>
 357                       <code class="computeroutput"><span class="identifier">little_bin_float</span></code>
 358                     </p>
 359                   </td>
 360 <td>
 361                     <p>
 362                       <code class="computeroutput"><span class="keyword">float</span></code>
 363                     </p>
 364                   </td>
 365 </tr>
 366 <tr>
 367 <td>
 368                     <p>
 369                       <code class="computeroutput"><span class="identifier">little_bin_double</span></code>
 370                     </p>
 371                   </td>
 372 <td>
 373                     <p>
 374                       <code class="computeroutput"><span class="keyword">double</span></code>
 375                     </p>
 376                   </td>
 377 </tr>
 378 <tr>
 379 <td>
 380                     <p>
 381                       <code class="computeroutput"><span class="identifier">little_word</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span></code>
 382                     </p>
 383                   </td>
 384 <td>
 385                     <p>
 386                       <code class="computeroutput"><span class="identifier">unused</span></code>
 387                     </p>
 388                   </td>
 389 </tr>
 390 <tr>
 391 <td>
 392                     <p>
 393                       <code class="computeroutput"><span class="identifier">little_dword</span><span class="special">(</span><span class="identifier">dw</span><span class="special">)</span></code>
 394                     </p>
 395                   </td>
 396 <td>
 397                     <p>
 398                       <code class="computeroutput"><span class="identifier">unused</span></code>
 399                     </p>
 400                   </td>
 401 </tr>
 402 <tr>
 403 <td>
 404                     <p>
 405                       <code class="computeroutput"><span class="identifier">little_qword</span><span class="special">(</span><span class="identifier">qw</span><span class="special">)</span></code>
 406                     </p>
 407                   </td>
 408 <td>
 409                     <p>
 410                       <code class="computeroutput"><span class="identifier">unused</span></code>
 411                     </p>
 412                   </td>
 413 </tr>
 414 <tr>
 415 <td>
 416                     <p>
 417                       <code class="computeroutput"><span class="identifier">little_bin_float</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
 418                     </p>
 419                   </td>
 420 <td>
 421                     <p>
 422                       <code class="computeroutput"><span class="identifier">unused</span></code>
 423                     </p>
 424                   </td>
 425 </tr>
 426 <tr>
 427 <td>
 428                     <p>
 429                       <code class="computeroutput"><span class="identifier">little_bin_double</span><span class="special">(</span><span class="identifier">d</span><span class="special">)</span></code>
 430                     </p>
 431                   </td>
 432 <td>
 433                     <p>
 434                       <code class="computeroutput"><span class="identifier">unused</span></code>
 435                     </p>
 436                   </td>
 437 </tr>
 438 </tbody>
 439 </table></div>
 440 <h6>
 441 <a name="spirit.qi.reference.binary.binary_little.h6"></a>
 442             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.complexity"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.complexity">Complexity</a>
 443           </h6>
 444 <div class="blockquote"><blockquote class="blockquote"><p>
 445               O(N), where N is the number of bytes parsed
 446             </p></blockquote></div>
 447 <h6>
 448 <a name="spirit.qi.reference.binary.binary_little.h7"></a>
 449             <span class="phrase"><a name="spirit.qi.reference.binary.binary_little.example"></a></span><a class="link" href="binary_little.html#spirit.qi.reference.binary.binary_little.example">Example</a>
 450           </h6>
 451 <div class="note"><table border="0" summary="Note">
 452 <tr>
 453 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td>
 454 <th align="left">Note</th>
 455 </tr>
 456 <tr><td align="left" valign="top"><p>
 457               The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a>
 458               section.
 459             </p></td></tr>
 460 </table></div>
 461 <p>
 462             Using declarations and variables:
 463           </p>
 464 <p>
 465 </p>
 466 <pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">little_word</span><span class="special">;</span>
 467 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">little_dword</span><span class="special">;</span>
 468 <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">little_qword</span><span class="special">;</span>
 469
 470 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint16_t</span> <span class="identifier">us</span><span class="special">;</span>
 471 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span> <span class="identifier">ui</span><span class="special">;</span>
 472 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">ul</span><span class="special">;</span>
 473 </pre>
 474 <p>
 475           </p>
 476 <p>
 477             Basic usage of the little endian binary parsers:
 478           </p>
 479 <p>
 480 </p>
 481 <pre class="programlisting"><span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"\x01\x02"</span><span class="special">,</span> <span class="identifier">little_word</span><span class="special">,</span> <span class="identifier">us</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">us</span> <span class="special">==</span> <span class="number">0x0201</span><span class="special">);</span>
 482 <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"\x01\x02\x03\x04"</span><span class="special">,</span> <span class="identifier">little_dword</span><span class="special">,</span> <span class="identifier">ui</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">ui</span> <span class="special">==</span> <span class="number">0x04030201</span><span class="special">);</span>
 483 <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"\x01\x02\x03\x04\x05\x06\x07\x08"</span><span class="special">,</span> <span class="identifier">little_qword</span><span class="special">,</span> <span class="identifier">ul</span><span class="special">);</span>
 484 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">ul</span> <span class="special">==</span> <span class="number">0</span><span class="identifier">x0807060504030201LL</span><span class="special">);</span>
 485
 486 <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"\x01\x02"</span><span class="special">,</span> <span class="identifier">little_word</span><span class="special">(</span><span class="number">0x0201</span><span class="special">));</span>
 487 <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"\x01\x02\x03\x04"</span><span class="special">,</span> <span class="identifier">little_dword</span><span class="special">(</span><span class="number">0x04030201</span><span class="special">));</span>
 488 <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"\x01\x02\x03\x04\x05\x06\x07\x08"</span><span class="special">,</span>
 489     <span class="identifier">little_qword</span><span class="special">(</span><span class="number">0</span><span class="identifier">x0807060504030201LL</span><span class="special">));</span>
 490 </pre>
 491 <p>
 492           </p>
 493 </div>
 494 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 495 <td align="left"></td>
 496 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2011 Joel de Guzman, Hartmut Kaiser<p>
 497         Distributed under the Boost Software License, Version 1.0. (See accompanying
 498         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 499       </p>
 500 </div></td>
 501 </tr></table>
 502 <hr>
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