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| 2 | Copyright (c) 2000-2014 Ericsson Telecom AB | |
| 3 | ||
| 4 | All rights reserved. This program and the accompanying materials | |
| 5 | are made available under the terms of the Eclipse Public License v1.0 | |
| 6 | which accompanies this distribution, and is available at | |
| 7 | http://www.eclipse.org/legal/epl-v10.html | |
| 8 | --> | |
| 9 | <html> | |
| 10 | <head> | |
| 11 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| 12 | <meta http-equiv="Content-Language" content="en-us"> | |
| 13 | <title>hexstring</title> | |
| 14 | </head> | |
| 15 | <body bgcolor="#DAD3C5" vlink="#0094D2" link="#003258"> | |
| 16 | <table align="left" border="0" cellspacing="0" cellpadding="0" valign=top> | |
| 17 | <tr> | |
| 18 | <td width=105 height=40><a href="https://projects.eclipse.org/projects/tools.titan"><img src="../images/titan_transparent.gif" border=0 width=105 height=40 align="left" alt="Titan"></a></td> | |
| 19 | </tr> | |
| 20 | </table> | |
| 21 | <table border="0" align="right" cellpadding="0" cellspacing="0"> | |
| 22 | <tr> | |
| 23 | <td><a href="../titan_main.html" alt="contents"><img border="0" src="../images/ao.jpg" width="53" height="40"></a></td> | |
| 24 | <td><a href="../titan_index.html" alt="index"><img border="0" src="../images/up.jpg" width="53" height="40"></a></td> | |
| 25 | <td><a alt="previous" href="hex2str.html"><img border="0" src="../images/left.jpg" width="53" height="40"></a></td> | |
| 26 | <td><a href="if.html" alt="next"><img border="0" src="../images/right.jpg" width="53" height="40"></a></td> | |
| 27 | </tr> | |
| 28 | </table> | |
| 29 | <p><br clear="all"> | |
| 30 | </p> | |
| 31 | <hr> | |
| 32 | <h1>hexstring</h1> | |
| 33 | <hr align="left" width="75%"> | |
| 34 | <p>The keyword <b><font face="Courier New">hexstring</font></b> denotes a basic string type whose distinguished values are the ordered sequences of of hexadecimal digits, each corresponding | |
| 35 | to an ordered sequence of four bits.</p> | |
| 36 | <ul> | |
| 37 | <li>hexadecimal string values are written between <a href="#double_quotation"> single quotes and followed by the capital letter H.</a> (' 'H).</li> | |
| 38 | <li>A hexadecimal string may be specified by its integer value using a <a href="#conversion">conversion function</a>.</li> | |
| 39 | <li>The <a href="#relation">relational operators</a> equality (==) and non-equality (!=) can be used to compare values of two hexadecimal strings</li> | |
| 40 | <li>The <a href="#shift">shift operators</a> perform the shift left (<<) and shift right (>>) operations.</li> | |
| 41 | <li>The <a href="#rotate">rotate operators</a> perform the rotate left (<@) and rotate right (@>) operations.</li> | |
| 42 | <li>The <a href="#concatenation"> concatenation operator</a> (&) performs a simple concatenation from left to right.</li> | |
| 43 | <li>Bitwise operators (<a href="and4b.html">and4b</a>, <a href="not4b.html">not4b</a>, <a href="or4b.html">or4b</a>, <a href="xor4b.html" | |
| 44 | target="_blank">xor4b</a>) are used to manipulate bits in the string.</li> | |
| 45 | <li>A <a href="#array"> single octet</a> may be accessed using an array-like syntax. The leftmost octet has the index zero.</li> | |
| 46 | <li>The hexadecimal string may be <a href="#vacuum">empty</a>.</li> | |
| 47 | <li>The length of the hexadecimal string can be constrained using the keyword <a href="length.html"><b><font face="Courier New" color="#003258" size="4">length</font></b></a>.</li> | |
| 48 | <li>Another way to limit the permitted values of an hexadecimal string is <a href="#list">to list them</a>.</li> | |
| 49 | <li>Predefined functions operating on hexadecimal strings:</li> | |
| 50 | <ul> | |
| 51 | <li><a href="#bit2hex">hex2oct</a> converts a hexadecimal string value to an octet string.</li> | |
| 52 | <li><a href="#str2int">hex2int</a> converts a hexadecimal string to the equivalent integer.</li> | |
| 53 | <li><a href="#str2oct">hex2bit</a> converts a hexadecimal string to a binary string.</li> | |
| 54 | <li><a href="#bit2str">hex2str</a> displays a hexadecimal string as a character string.</li> | |
| 55 | <li><a href="#lengthof">lengthof</a> returns an integer value indicating the number of octets in a string.</li> | |
| 56 | </ul> | |
| 57 | </ul> | |
| 58 | <p>Related keyword:</p> | |
| 59 | <ul> | |
| 60 | <li><a href="bit2hex.html"><b><font face="Courier New" color="#003258" size="4">bit2hex</font></b></a></li> | |
| 61 | <li><a href="hex2bit.html"><b><font face="Courier New" color="#003258" size="4">hex2bit</font></b></a></li> | |
| 62 | <li><a href="hex2int.html"><b><font face="Courier New" color="#003258" size="4">hex2int</font></b></a></li> | |
| 63 | <li><a href="hex2oct.html"><b><font face="Courier New" color="#003258" size="4">hex2oct</font></b></a></li> | |
| 64 | <li><a href="hex2str.html"><b><font face="Courier New" color="#003258" size="4">hex2str</font></b></a></li> | |
| 65 | <li><a href="int2hex.html"><b><font face="Courier New" color="#003258" size="4">int2hex</font></b></a></li> | |
| 66 | <li><a href="length.html"><b><font face="Courier New" color="#003258" size="4">length</font></b></a></li> | |
| 67 | <li><a href="lengthof.html"><b><font face="Courier New" color="#003258" size="4">lengthof</font></b></a></li> | |
| 68 | <li><a href="oct2hex.html"><b><font face="Courier New" color="#003258" size="4">oct2hex</font></b></a></li> | |
| 69 | <li><a href="str2hex.html"><b><font face="Courier New" color="#003258" size="4">str2hex</font></b></a></li> | |
| 70 | <li><a href="substr.html"><b><font face="Courier New" color="#003258" size="4">substr</font></b></a></li> | |
| 71 | <li><a href="and4b.html"><b><font face="Courier New" color="#003258" size="4">and4bit</font></b></a></li> | |
| 72 | <li><a href="not4b.html"><b><font face="Courier New" color="#003258" size="4">not4bit</font></b></a></li> | |
| 73 | <li><a href="or4b.html"><b><font face="Courier New" color="#003258" size="4">or4bit</font></b></a></li> | |
| 74 | <li><a href="xor4b.html"><b><font face="Courier New" color="#003258" size="4">xor4bit</font></b></a></li> | |
| 75 | </ul> | |
| 76 | <hr align="left" width="50%"> | |
| 77 | <div align="center"> | |
| 78 | <center> | |
| 79 | <table border="0" width="90%" bgcolor="#FFB599" cellpadding="4"> | |
| 80 | <tr> | |
| 81 | <td width="100%"> | |
| 82 | <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>hexstring</b></font></h3> | |
| 83 | </td> | |
| 84 | </tr> | |
| 85 | </table> | |
| 86 | </center> | |
| 87 | </div> | |
| 88 | <hr align="left" width="50%"> | |
| 89 | <p><a name="double_quotation">Example 1</a>: | |
| 90 | <p><font face="Courier New">const hexstring c_elch := 'C'H;<br> | |
| 91 | </font> | |
| 92 | <p>The constant called c_elch contains the hexadecimal string C.</p> | |
| 93 | <hr align="left" width="50%"> | |
| 94 | <p><a name="conversion">Example 2</a>: | |
| 95 | <p><font face="Courier New">const hexstring c_entiere := int2hex (64,3);<br> | |
| 96 | </font> | |
| 97 | <p>The constant c_entiere will contain the hexadecimal string 040 because the converted integer number (64 -> 40) must be coded on 3 hexadecimal digits and therefore padded with a leading zero.</p> | |
| 98 | <hr align="left" width="50%"> | |
| 99 | <p><a name="relation">Example 3</a>: | |
| 100 | <p><font face="Courier New">const boolean c_undanbedes := ( c_entiere == c_elch );<br> | |
| 101 | </font> | |
| 102 | <p>The constant c_undanbedes will have the value false, because two hexadecimal strings are not equal. The parentheses are optional.</p> | |
| 103 | <hr align="left" width="50%"> | |
| 104 | <p><a name="concatenation">Example 4</a>: | |
| 105 | <p><font face="Courier New">const hexstring c_samman := c_entiere & c_elch;<br> | |
| 106 | </font> | |
| 107 | <p>The constant c_samman will contain the hexadecimal string 040C </p> | |
| 108 | <hr align="left" width="50%"> | |
| 109 | <p><a name="array">Example 5</a>: | |
| 110 | <p><font face="Courier New">const hexstring c_lakomec := c_entiere[1];<br> | |
| 111 | </font> | |
| 112 | <p>The constant called c_lakomec will contain the hexadecimal string 4.</p> | |
| 113 | <hr align="left" width="50%"> | |
| 114 | <p><a name="vacuum">Example 6</a>: | |
| 115 | <p><font face="Courier New">const hexstring c_tomt := ''H;<br> | |
| 116 | </font> | |
| 117 | <p>The constant called c_tomt will be an empty string.</p> | |
| 118 | <hr align="left" width="50%"> | |
| 119 | <p><a name="bit2hex">Example 7a</a>: | |
| 120 | <p><font face="Courier New">const octetstring c_kaprifol := hex2oct ('7AA'H);</font><br> | |
| 121 | <p>The constant called c_kaprifol will contain the octet string 07AA. The resulting octet string contains 0 as leftmost hex digit followed by the same sequence of hex digits as in the hexadecimal | |
| 122 | string because the number of the hexadecimal digits is odd.</p> | |
| 123 | <hr align="left" width="50%"> | |
| 124 | <p><a name="str2int">Example 7b</a>: | |
| 125 | <p><font face="Courier New">const integer c_gondol := hex2int ('555'H);<br> | |
| 126 | </font> | |
| 127 | <p>The constant called c_gondol will have the integer value 1365. The result will be always positive.</p> | |
| 128 | <hr align="left" width="50%"> | |
| 129 | <p><a name="str2oct">Example 7c</a>: | |
| 130 | <p><font face="Courier New">const bitstring c_perrongen := hex2bit ('A7'H);<br> | |
| 131 | </font> | |
| 132 | <p>The constant called c_perrongen will contain the bit string 10100111.</p> | |
| 133 | <hr align="left" width="50%"> | |
| 134 | <p><a name="bit2str">Example 7d</a>: | |
| 135 | <p><font face="Courier New">const charstring c_snaella := hex2str ('BBC0530A0'H);<br> | |
| 136 | </font> | |
| 137 | <p>The constant called c_snaella will contain the string BBC0530A0 because the resulting character string has the same length as the hexadecimal string and contains only the characters '0' .. 'F'.</p> | |
| 138 | <hr align="left" width="50%"> | |
| 139 | <p><a name="lengthof">Example 7e</a>: | |
| 140 | <p><font face="Courier New">const integer c_skynda := lengthof ('BBC0530A0'H);<br> | |
| 141 | </font> | |
| 142 | <p>The constant called c_skynda will have the value 9 corresponding to the number of octets in the string.</p> | |
| 143 | <hr align="left" width="50%"> | |
| 144 | <p><a name="list">Example 8</a>: | |
| 145 | <p><font face="Courier New">var hexstring c_mot ('010'H,'77'H,'A55CC'H );<br> | |
| 146 | </font> | |
| 147 | <p>The variable called c_mot may hold the hexadecimal strings 010, 77 and A55CC only.</p> | |
| 148 | <hr align="left" width="50%"> | |
| 149 | <p><a name="rotate">Example 9</a>: </p> | |
| 150 | <p><font face="Courier New">const hexstring c_koerhinta := '12345'H @> 2;<br> | |
| 151 | </font> | |
| 152 | <p>The constant called c_koerhinta will hold the value '45123'H (the left operand rotated by two hexadecimal digits). </p> | |
| 153 | <hr align="left" width="50%"> | |
| 154 | <p><a name="shift">Example 10</a>:</p> | |
| 155 | <p><font face="Courier New">const hexstring c_wet := '12345'H >> 2; <br> | |
| 156 | </font> | |
| 157 | <p>The constant called c_wet will hold the value '00123'H (the left operand shifted by two hexadecimal digits).</p> | |
| 158 | <hr align="left" width="25%"> | |
| 159 | <hr align="left" width="25%"> | |
| 160 | <p align="left"><a HREF="BNF.html#hexstringkeyword">BNF definition</a> of <font face="Courier New">hexstring</font><br> | |
| 161 | <a HREF="BNF.html#hexstringvalue">BNF definition</a> of hexstring value</p> | |
| 162 | </body> | |
| 163 | </html> |