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+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
+<html>
+  <head>
+    <title>DataTypes</title>
+  </head>
+  <body bgcolor="#F0F0F0">
+  <body>
+    <font face="arial,helvetica" color="#555588"><h1>DataTypes</h1></font>
+    HDF and IEEEIO must be able to store any of the basic datatypes
+    available to a given computer architecture (various sized integers 
+    and floating point numbers).  In Fortran the datatype is
+    identified by an integer.  In C we use <b>#defines</b>.  In C++ we
+    use <b>enums</b>.  There are also simple built-in utility operations
+      available which allow computation of data space used by these
+      various datatypes (<i>
+      <a href="#sizeof">sizeOf()</a>, 
+      <a href="#nelements">nElements()</a>, 
+      <a href="#nbytes">nBytes()</a>
+      </i>)<p>
+
+Here is how the types are related.<p>
+
+<table border=1>
+<tr>
+<td> <font face="arial,helvetica" color="#885533"><b>Datatype</b></font></td>
+<td> <font face="arial,helvetica" color="#885533"><b>Num Bytes</b></font></td>
+<td> <font face="arial,helvetica" color="#885533"><b>C++ TypeID</b></font></td>
+<td> <font face="arial,helvetica" color="#885533"><b>C TypeID</b></font></td>
+<td> <font face="arial,helvetica" color="#885533"><b>Fortran TypeID</b></font></td>
+</tr>
+
+<tr>
+<td>byte binary data <i>(not to be confused with text/strings)</i>
+<td>1
+<td>Byte,Int8
+<td>BYTE,INT8
+<td>0
+<tr>
+
+<td>short (16bit) integer
+<td>2
+<td>Int16
+<td>INT16
+<td>1
+<tr>
+<td>32bit integer
+<td>4
+<td>Int32
+<td>INT32
+<td>2
+<tr>
+<td>64bit integer
+<td>8
+<td>Int64
+<td>INT64
+<td>3
+<tr>
+<td>single precision floating point
+<td>4
+<td>Float32
+<td>FLOAT32
+<td>4
+<tr>
+<td>double precision floating point
+<td>8
+<td>Float64
+<td>FLOAT64
+<td>5
+<tr>
+<td>unsigned byte
+<td>1
+<td>uChar,uInt8
+<td>UCHAR,UINT8
+<td>6
+<tr>
+<td>unsigned short (16 bit) integer
+<td>2
+<td>uInt16
+<td>UINT16
+<td>7
+<tr>
+<td>unsigned 32bit integer
+<td>4
+<td>uInt32
+<td>UINT32
+<td>8
+<tr>
+<td>unsigned 64bit integer
+<td>8
+<td>uInt64
+<td>UINT64
+<td>9
+<tr>
+<td>special byte type for text data <i>(to differentiate it from binary byte data)</i>
+<td>1
+<td>Char,Char8,String
+<td>CHAR,CHAR8,STRING 
+<td>10
+<tr>
+<td>special type for unicode (16bit) text to differentiate from binary 
+																		  unsigned integer data
+<td>2
+<td>Unicode,Char16
+<td>UNICODE,CHAR16
+<td>11
+
+	</table><p>
+
+      <hr>
+      <font face="arial,helvetica" color="#555588"><h2><a name="utils">Utility Subroutines</a></h2></font>
+      Various utility subroutines can be used to use the type
+      information to compute data array sizes.
+      <a name="nbytes"><u><h3>Number of Bytes in a Dataset</h3></u></a>
+      <DL>
+	<DD>
+      <DL>
+	<DT><b>C++ Call Format</b>
+	<DD><code>int IObase::nBytes(IObase::DataType datatype,int rank,int *dims)</code>
+	<DT><b>C Call Format</b>
+	<DD><code>int IOnBytes(int datatype,int rank,int *dims)</code>
+	<DT><b>F77 Call Format</b>
+	<DD> <code>INTEGER IO_NBYTES(INTEGER datatype,INTEGER
+	    rank,INTEGER dims(*))</code></DL>
+      <hr>
+	  <DL>
+	    <DT><i>datatype</i>:
+	    <DD>The datatype for elements of the array
+	    <DT><i>rank</i>:
+	    <DD>The number of dimensions of the array
+	    <DT><i>dims</i>:
+	    <DD>A vector of the dimensions of the array
+	    <DT><font color="#885533"><b><i>returns</i></b></font>
+	    <DD>Returns the number of bytes required to store the array
+	  </DL>
+      <hr>
+      </DL>
+
+      <a name="nelements"><u><h3>Number of Elements in a Dataset</h3></u></a>
+       <DL>
+	<DD>
+	  <DL>
+	<DT><b>C++ Call Format</b>
+	<DD><code>int IObase::nElements(int rank,int *dims)</code>
+	<DT><b>C Call Format</b>
+	<DD><code>int IOnElements(int rank,int *dims)</code>
+	<DT><b>F77 Call Format</b>
+	<DD> <code>INTEGER IO_NELEMENTS(INTEGER rank,INTEGER dims(*))</code></DL>
+	  <hr>
+	  <DL>
+	    <DT><i>rank</i>:
+	    <DD>The number of dimensions of the array
+	    <DT><i>dims</i>:
+	    <DD>A vector of the dimensions of the array
+	    <DT><font color="#885533"><b><i>returns</i></b></font>
+	    <DD>Returns the number of elements required in the array
+	  </DL>
+      <hr>
+      </DL>
+
+      <a name="sizeof"><u><h3>Size of a DataType in Bytes</h3></u></a>
+       <DL>
+	<DD>
+	  <DL>
+	<DT><b>C++ Call Format</b>
+	<DD><code>int IObase::sizeOf(IObase::DataType datatype)</code>
+	<DT><b>C Call Format</b>
+	<DD><code>int IOsizeOf(int datatype)</code>
+	<DT><b>F77 Call Format</b>
+	<DD> <code>INTEGER IO_SIZEOF(INTEGER datatype)</code></DL>
+      <hr>
+	  <DL>
+	    <DT><i>datatype</i>:
+	    <DD>The datatype for elements of the array.
+	    <DT><font color="#885533"><b><i>returns</i></b></font>
+	    <DD>Returns the number of bytes used by an element of the
+	      specified datatype.
+	  </DL>
+      <hr>
+      </DL>
+
+      <hr>
+      <address><a href="mailto:jshalf@ariel.ncsa.uiuc.edu"></a></address>
+      <!-- Created: Thu Jan 28 16:35:13 CST 1999 -->
+      <!-- hhmts start -->
+Last modified: Wed Feb  3 22:02:45 CST 1999
+<!-- hhmts end -->
+    </body>
+</html>