-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>Character encoding</title><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"></head><body>
-<h1 align="center">Character encoding</h1>
-<br>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>
+ <title>Character encoding</title>
+ <meta http-equiv="content-type" content="text/html;
+charset=UTF-8">
+</head><body>
+<h1 align="center">Character encoding<br>
+</h1>
+
<h2>Index</h2>
+
<ul>
+
<li><a href="#The_character_encoding_problem">The character encoding problem</a></li>
- <li><a href="#Unicode">Unicode</a><br>
+ <li><a href="#Unicode">Unicode code points</a></li><li><a href="#Unicode_encodings_UTF-8">Unicode encodings, UTF-8</a><br>
</li>
+
</ul>
+
<br>
+
<hr width="100%" size="2">
<h2><a name="The_character_encoding_problem"></a>The character encoding problem</h2>
+
Developers are usually familiar with the ASCII character set. This
is a character set that assigns a unique number to some characters, e.g.
an "A" has ASCII code 65 (or 0x41 in hex), and an "a" has ASCII code 97 (or
0x61 in hex). Some people may also have used ASCII codes for several
drawing characters (such as a horizontal bar, a vertical bar, or a top-right
corner) in the old DOS days, to be able to draw nice windows in text mode.<br>
+
<br>
+
However, these last characters are strictly spoken not part of the ASCII
set. The standard ASCII set contains only the character positions from
0 to 127 (i.e. anything that fits into an integer that is 7 bits wide). An
example of this table can be found <a href="http://web.cs.mun.ca/%7Emichael/c/ascii-table.html">here</a>. Anything that has an ASCII code between 128 and 255 is in principle undefined.<br>
+
<br>
+
Now, several systems (including the old DOS) have defined those character
positions anyway, but usually in totally different ways. Some well
known extensions are:<br>
+
<ul>
+
<li>the <a href="http://czyborra.com/charsets/cp437.gif">DOS</a>
character set, nowadays usually known as Code Page 437, but sometimes also
named LatinUS, ECS (Extended Character Set) or PC-8; note that the table
displayed in the link also contains the standard ASCII part</li><li>the <a href="http://czyborra.com/charsets/cp1252.gif">ANSI</a> character set, also known as Code Page 1252, and usually the default on Windows</li><li>the <a href="http://czyborra.com/charsets/iso8859-1.gif">ISO-8859-1</a> character set (also called Latin-1), which is an ISO standard for Western European languages, mostly used on various Unices</li><li>the <a href="http://czyborra.com/charsets/adobe-stdenc.gif">Adobe Standard Encoding</a>, which is by default used in Postscript, unless overridden</li>
</ul>
+
And these are only examples of character sets used in West-European languages.
For Japanese, Chinese, Korean, Vietnamese, ... there are separate character
sets in which one byte's meaning can even be influenced by what the previous
byte was, i.e. these are multi-byte character sets. This is because
even 256 characters (the maximum for 8 bits) is totally inadequate to represent all characters in
such languages.<br>
+
<br>
+
So, summarizing, if a text file contains a byte that has a value 65, it is
pretty safe to assume that this byte represents an "A", if we ignore the
multi-byte character sets spoken of before. However, a value 233 cannot
In Latin-1, it happens to be the character "é", but in another
character set it can be something totally different (e.g. in the DOS character
set it is the Greek letter theta).<br>
+
+<br>
+
+<div align="center"><img src="images/fromhex.png" alt="Conversion from byte value" width="386" height="140">
<br>
+</div>
+
+
+<br>
+
Vice versa, if you need to write a character "é" to a file, it depends
on the character set you will use what the numerical value will be in the
file: in Latin-1 it will be 233, but if you use the DOS character set it
-will be 130.<br>
+will be 130, making it necessary again to know the encoding when you want to re-read the file.<br>
+
+<br>
+
+<div align="center"><img src="images/tohex.png" alt="Conversion to byte value" width="382" height="140">
+<br>
+<br>
+<div align="left">This is a source of great confusion as soon as you go outside
+the normal English character set, especially when you are using files on
+different systems...<br>
+</div>
+</div>
+
+
<hr width="100%" size="2">
-<h2><a name="Unicode"></a>Unicode</h2>
+<h2><a name="Unicode"></a>Unicode code points</h2>
+
+
+Enter the <a href="www.unicode.org">Unicode</a> standard...<br>
+
+<br>
+
+Unicode solves the problem of encoding by assigning unique numbers to <b>every</b>
+ character that is used anywhere in the world. Since it is not possible
+to do this in 8 bits (with a maximum of 256 code positions), a Unicode character
+is usually represented by 16 bits, denoted by U+0000 to U+FFFF in hexadecimal
+style. A number such as U+0123 is named a "code point".<br>
+
+<br>
+ Recently (Unicode 3.1), some extensions have even been defined so that in
+fact the defined range is now U+000000 to U+10FFFF (21 bits), and formally,
+the character set is defined as 31-bits to allow for future expansion.<br>
+
+<br>
+
+The Unicode character set is backward compatible with the ISO-8859-1 or Latin-1
+character set (and thus automatically also with the ASCII character set),
+because for every ISO-8859-1 character with hexadecimal value 0xXY, the corresponding
+Unicode code point is U+00XY.<br>
+
+<br>
+ Some examples of Unicode code points (some of the characters here may not
+be displayed correctly in all browsers; current Mozilla works perfectly for
+this, but it also depends on the installed fonts of course):<br>
+<br>
+
+<table cellpadding="2" cellspacing="2" border="1" width="50%" align="center">
+
+ <tbody>
+ <tr>
+ <td valign="top" align="center"><b>Unicode code point</b><br>
+ </td>
+ <td valign="top" align="center"><b>Character</b><br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">U+0041<br>
+ </td>
+ <td valign="top">A<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">U+00E9<br>
+ </td>
+ <td valign="top">é<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">U+03B8<br>
+ </td>
+ <td valign="top">θ (the Greek theta)<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">U+20AC<br>
+ </td>
+ <td valign="top">€ (the euro)<br>
+ </td>
+ </tr>
+ </tbody>
+</table>
+
+<br>
+Using the Unicode code points there is no confusion anymore which character
+is meant, because they uniquely define the character. The full Unicode
+code charts can be found <a href="http://www.unicode.org/charts">here</a>
+ (as a set of PDF documents). A nice application to see all Unicode
+characters is the Unicode Character Map (ucm), which can be found <a href="ftp://ftp.dcs.ed.ac.uk/pub/jec/programs/">here</a>, and which allows to select and paste any Unicode character.<br>
+<br>
+Some additional terminology (more terminology follows in the next section):<br>
+<ul>
+ <li><b>UCS</b> (Universal Character Set): the official name for the Unicode character set<br>
+ <br>
+ </li>
+ <li><b>ISO 10646</b>: the international standard that defines the Unicode character set<br>
+ <br>
+ </li>
+ <li><b>BMP</b> (Basic Multilingual Plane) or Plane 0 is the 16-bit subset
+of UCS, i.e. the characters U+0000 to U+FFFF, which is supposed to cover
+all characters is all currently used languages. Code points outside that range are used for historical character sets (e.g. hieroglyphs) and special symbols.</li>
+</ul>
+<hr width="100%" size="2">
+<h2><a name="Unicode_encodings_UTF-8"></a>Unicode encodings, UTF-8</h2>
+Since Unicode characters are generally represented by a number that is 16
+bits wide, as seen above (for the basic plane), it would seem that all text
+files would double in size, since the usual ASCII characters are 8 bits wide.
+ However, the Unicode code points are not necessarily the values that
+are written to files... <br>
+<br>
+Indeed, the simplest solution is to take the code point that defines a character,
+split it up into two bytes, and write the two bytes to the file. This
+is called the UCS-2 encoding scheme:<br>
+<br>
+<table cellpadding="2" cellspacing="2" border="1" width="75%" align="center">
+ <tbody>
+ <tr>
+ <td valign="top" align="center"><b>Character</b><br>
+ </td>
+ <td valign="top" align="center"><b>Unicode code point</b><br>
+ </td>
+ <td valign="top" align="center"><b>Byte values in file (UCS-2)</b><br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">A<br>
+ </td>
+ <td valign="top">U+0041<br>
+ </td>
+ <td valign="top">0x00, 0x41<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">é<br>
+ </td>
+ <td valign="top">U+00E9<br>
+ </td>
+ <td valign="top">0x00, 0xE9<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">θ (theta)<br>
+ </td>
+ <td valign="top">U+03B8<br>
+ </td>
+ <td valign="top">0x03, 0xB8<br>
+ </td>
+ </tr>
+ <tr>
+ <td valign="top">€ (euro)<br>
+ </td>
+ <td valign="top">U+20AC<br>
+ </td>
+ <td valign="top">0x20, 0xAC<br>
+ </td>
+ </tr>
+ </tbody>
+</table>
+<br>
+This table assumes a big-endian encoding of UCS-2: the endianness is in principle
+not defined, so there are two versions of UCS-2. The little-endian
+encoding results in the same values as in the table above, but in the inverse
+order.<br>
+<br>
+So, we see that the UCS-2 encoding results in a doubling of file sizes for
+files that contain only English text. This is a disadvantage for this
+encoding. Another disadvantage is that null bytes can occur in normal
+text, breaking all conventions for null-terminated C strings if you use the
+normal <code>char</code> type. This is why C also defines the <code>wchar_t</code>
+ type, which can hold a 32-bit character (at least in GNU systems). To
+avoid both of these disadvantages, UTF-8 was introduced.<br>
+<br>
+In UTF-8, the number of bytes used to write a character to a file depends
+on the Unicode code point. The corresponding table to the table above
+is:<br>
+<br>
+<table cellpadding="2" cellspacing="2" border="1" width="75%" align="center">
+<tbody><tr><td valign="top" align="center"><b>Character</b><br></td><td valign="top" align="center"><b>Unicode code point</b><br></td><td valign="top" align="center"><b>Byte values in file (UTF-8)</b><br></td></tr><tr><td valign="top">A<br></td><td valign="top">U+0041<br></td><td valign="top">0x41<br></td></tr><tr><td valign="top">é<br></td><td valign="top">U+00E9<br></td><td valign="top">0xC3, 0xA9<br></td></tr><tr><td valign="top">θ (theta)<br></td><td valign="top">U+03B8<br></td><td valign="top">0xCE, 0xB8<br></td></tr><tr><td valign="top">€ (euro)<br></td><td valign="top">U+20AC<br></td><td valign="top">0xE2, 0x82, 0xAC<br></td></tr></tbody>
+</table>
+<br>
+Some immediate observations:<br>
+<ul>
+ <li>Null characters don't occur, so there is no problem to put such characters
+in a null-terminated C string (without having to use the <code>wchar_t</code> type), although it is a little more difficult to get the length of the string.<br>
+ <br>
+ </li>
+ <li>Strict ASCII characters are encoded into 1 byte, which makes UTF-8
+completely backward compatible with ASCII. It doesn't change the size
+of normal ASCII text files.<br>
+ <br>
+ </li>
+ <li>Some characters need 3 bytes in UTF-8. Indeed, all basic plane
+characters (U+0000 to U+FFFF) can be encoded in 1, 2 or 3 bytes.</li>
+</ul>
+An excellent explanation of how to encode characters in UTF-8 can be found <a href="http://www.cl.cam.ac.uk/%7Emgk25/unicode.html#utf-8">on this page</a>.<br>
+<br>
+Some additional terminology regarding encoding schemes (less important here):<br>
+<ul>
+ <li><b>UCS-2</b>: the encoding of Unicode characters in 2 bytes (16 bits) per character, can only encode U+0000 to U+FFFF (the basic plane)<br>
+ <br>
+ </li>
+ <li><b>UCS-4</b>: the encoding of Unicode characters in 4 bytes (32 bits) per character, can encode the entire UCS range<br>
+ <br>
+ </li>
+ <li><b>UTF-8</b>: the encoding scheme described above (UTF = UCS Transformation Format)<br>
+ <br>
+ </li>
+ <li><b>UTF-16</b>: an extension to UCS-2 to be able to encode characters
+outside the basic plane (the 21-bit range of Unicode 3.1), by using a sequence
+of two 16-bit characters<br>
+ <br>
+ </li>
+ <li><b>UTF-32</b>: the 4-byte encoding of the 21-bit range of Unicode 3.1, in fact the same as UCS-4<br>
+ <br>
+ </li>
+ <li><b>UTF-7</b>: can be safely forgotten... (a kind of 7-bit clean version of UTF-8)</li>
+</ul>
+Note that the byte order of UCS-2, UCS-4, UTF-16 and UTF-32 is not defined, so it can be big endian or little endian !<br>
-Enter the Unicode standard...<br>
<hr width="100%" size="2">
<pre><font size="-1">$Id$<br>$Name$</font><br></pre>
+
<br>
+
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