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<h1 class="topictitle1">Data encoding</h1>
<div><p>Most operating systems, such as AIX<sup>®</sup> and Linux<sup>®</sup>, use ASCII character encoding. Most <span class="keyword">i5/OS™</span> functions use EBCDIC character
encoding. You can specify a coded character set identifier (CCSID) value for
some <span class="keyword">i5/OS</span> object types
to identify a specific encoding for character data in the object.</p>
<p><span class="keyword">i5/OS</span> PASE byte stream
files have a CCSID attribute that is used by most system interfaces outside <span class="keyword">i5/OS</span> PASE to convert text data
read from or written to the file as needed. <span class="keyword">i5/OS</span> PASE
does not do CCSID conversion for data read from or written to stream files
(consistent with AIX), but it does set the CCSID attribute of any byte
stream file created by an <span class="keyword">i5/OS</span> PASE
program to the current <span class="keyword">i5/OS</span> PASE
CCSID value so other system functions can correctly handle ASCII text in the
file.</p>
<p>If you use AIX APIs
that are shipped in the <span class="keyword">i5/OS</span> PASE
shared libraries, <span class="keyword">i5/OS</span> PASE
handles most of the data conversion for you. <span class="keyword">i5/OS</span> PASE
programs can use <tt>iconv</tt> functions provided in shared library <tt>libiconv.a</tt> for
any character data conversions that are not handled automatically by <span class="keyword">i5/OS</span> PASE runtime. For example,
an <span class="keyword">i5/OS</span> PASE application
generally needs to convert character strings to EBCDIC before calling an <span class="keyword">i5/OS</span> API function (using either
_ILECALLX or _PGMCALL).</p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzalfinteract.htm" title="As you customize your i5/OS PASE programs to use i5/OS functions, you need to consider the ways in which your program will interact with them.">How i5/OS PASE programs interact with i5/OS</a></div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzalffilesystems.htm" title="i5/OS PASE programs can access any file or resource that is accessible through the integrated file system, including objects in the QSYS.LIB and QOPT file systems.">File systems</a></div>
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