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+<html>
+<head><title>
+HDF5/Predefined Datatypes
+</title></head>
+
+<body bgcolor="#FFFFFF">
+
+
+<hr>
+<center>
+<table border=0 width=98%>
+<tr><td valign=top align=left>
+<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
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+<!--
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+And in this document, the
+<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;&nbsp;
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+<a href="PredefDTypes.html">Datatypes</a>&nbsp;&nbsp;
+</td></tr>
+</table>
+</center>
+<hr>
+
+
+<center>
+<h1>HDF5 Predefined Datatypes</h1>
+</center>
+
+
+The following datatypes are predefined in HDF5.
+
+
+<h4>IEEE floating point datatypes</h4>
+ <ul>
+ <li>32-bit and 64-bit
+ <li>Big-endian and little-endian
+ </ul>
+
+<pre>
+ H5T_IEEE_F32BE
+ H5T_IEEE_F32LE
+ H5T_IEEE_F64BE
+ H5T_IEEE_F64LE
+</pre>
+
+
+<h4>Standard datatypes</h4>
+ <ul>
+ <li>Signed integer (2's complement), unsigned integer, and bitfield
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ <li>Big-endian and little-endian
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=33% align=left>
+<pre>
+ H5T_STD_I8BE
+ H5T_STD_I8LE
+ H5T_STD_I16BE
+ H5T_STD_I16LE
+ H5T_STD_I32BE
+ H5T_STD_I32LE
+ H5T_STD_I64BE
+ H5T_STD_I64LE
+</pre>
+ </td>
+ <td valign=top width=34% align=left>
+<pre>
+ H5T_STD_U8BE
+ H5T_STD_U8LE
+ H5T_STD_U16BE
+ H5T_STD_U16LE
+ H5T_STD_U32BE
+ H5T_STD_U32LE
+ H5T_STD_U64BE
+ H5T_STD_U64LE
+</pre>
+ </td>
+ <td valign=top width=33% align=left>
+<pre>
+ H5T_STD_B8BE
+ H5T_STD_B8LE
+ H5T_STD_B16BE
+ H5T_STD_B16LE
+ H5T_STD_B32BE
+ H5T_STD_B32LE
+ H5T_STD_B64BE
+ H5T_STD_B64LE
+</pre>
+ </tr></td>
+ </table>
+
+ <ul>
+ <li>Object reference or dataset region reference
+ </ul>
+
+<pre>
+ H5T_STD_REF_OBJ
+ H5T_STD_REF_DSETREG
+</pre>
+
+
+<h4>UNIX-specific datatypes</h4>
+ <ul>
+ <li>32-bit and 64-bit
+ <li>Big-endian and little-endian
+ </ul>
+
+<pre>
+ H5T_UNIX_D32BE
+ H5T_UNIX_D32LE
+ H5T_UNIX_D64BE
+ H5T_UNIX_D64LE
+</pre>
+
+
+<h4>C-specific datatype</h4>
+ <ul>
+ <li>String datatype in C (size defined in bytes rather than in bits)
+ </ul>
+
+<pre>
+ H5T_C_S1
+</pre>
+
+
+<h4>FORTRAN-specific datatype</h4>
+ <ul>
+ <li>String datatype in FORTRAN (as defined for the HDF5 C library)
+ </ul>
+
+<pre>
+ H5T_FORTRAN_S1
+</pre>
+
+
+<h4>Intel-specific datatypes</h4>
+ <ul>
+ <li>For Intel CPUs
+ <li>Little-endian
+ <li>Signed integer (2's complement), unsigned integer, bitfield, and
+ IEEE floating point
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=50% align=left>
+<pre>
+ H5T_INTEL_I8
+ H5T_INTEL_I16
+ H5T_INTEL_I32
+ H5T_INTEL_I64
+
+ H5T_INTEL_U8
+ H5T_INTEL_U16
+ H5T_INTEL_U32
+ H5T_INTEL_U64
+</pre>
+ </td>
+ <td valign=top width=50% align=left>
+<pre>
+ H5T_INTEL_B8
+ H5T_INTEL_B16
+ H5T_INTEL_B32
+ H5T_INTEL_B64
+
+ H5T_INTEL_F32
+ H5T_INTEL_F64
+</pre>
+ </tr></td>
+ </table>
+
+
+<h4>DEC Alpha-specific datatypes</h4>
+ <ul>
+ <li>For DEC Alpha CPUs
+ <li>Little-endian
+ <li>Signed integer (2's complement), unsigned integer, bitfield, and
+ IEEE floating point
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=50% align=left>
+<pre>
+ H5T_ALPHA_I8
+ H5T_ALPHA_I16
+ H5T_ALPHA_I32
+ H5T_ALPHA_I64
+
+ H5T_ALPHA_U8
+ H5T_ALPHA_U16
+ H5T_ALPHA_U32
+ H5T_ALPHA_U64
+</pre>
+ </td>
+ <td valign=top width=50% align=left>
+<pre>
+ H5T_ALPHA_B8
+ H5T_ALPHA_B16
+ H5T_ALPHA_B32
+ H5T_ALPHA_B64
+
+ H5T_ALPHA_F32
+ H5T_ALPHA_F64
+</pre>
+ </tr></td>
+ </table>
+
+
+<h4>MIPS-specific datatypes</h4>
+ <ul>
+ <li>For MIPS CPUs, commonly used in SGI system
+ <li>Big-endian
+ <li>Signed integer (2's complement), unsigned integer, bitfield, and
+ IEEE floating point
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=50% align=left>
+<pre>
+ H5T_MIPS_I8
+ H5T_MIPS_I16
+ H5T_MIPS_I32
+ H5T_MIPS_I64
+
+ H5T_MIPS_U8
+ H5T_MIPS_U16
+ H5T_MIPS_U32
+ H5T_MIPS_U64
+</pre>
+ </td>
+ <td valign=top width=50% align=left>
+<pre>
+ H5T_MIPS_B8
+ H5T_MIPS_B16
+ H5T_MIPS_B32
+ H5T_MIPS_B64
+
+ H5T_MIPS_F32
+ H5T_MIPS_F64
+</pre>
+ </tr></td>
+ </table>
+
+
+<h4>Predefined native datatypes</h4>
+ <dir>
+ These are the datatypes detected by <code>H5detect</code>.
+ Their names differ from other HDF5 datatype names as follows:
+ <ul>
+ <li>Instead of a class name, precision, and byte order as the last
+ component, they have a C-like datatype name.
+ <li>If the datatype begins with <code>U</code>, then it is the unsigned
+ version of the integer datatype; other integer datatypes are signed.
+ <li>The datatype <code>LLONG</code> corresponds to
+ C's <code>long_long</code> and
+ <code>LDOUBLE</code> is <code>long_double</code>.
+ These datatypes might be the same as <code>LONG</code> and
+ <code>DOUBLE</code>, respectively.
+ </ul>
+ </dir>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=50% align=left>
+<pre>
+ H5T_NATIVE_CHAR
+ H5T_NATIVE_SCHAR
+ H5T_NATIVE_UCHAR
+
+ H5T_NATIVE_SHORT
+ H5T_NATIVE_USHORT
+
+ H5T_NATIVE_INT
+ H5T_NATIVE_UINT
+
+ H5T_NATIVE_LONG
+ H5T_NATIVE_ULONG
+ H5T_NATIVE_LLONG
+ H5T_NATIVE_ULLONG
+</pre>
+ </td>
+ <td valign=top width=50% align=left>
+<pre>
+ H5T_NATIVE_FLOAT
+ H5T_NATIVE_DOUBLE
+ H5T_NATIVE_LDOUBLE
+
+ H5T_NATIVE_B8
+ H5T_NATIVE_B16
+ H5T_NATIVE_B32
+ H5T_NATIVE_B64
+
+ H5T_NATIVE_OPAQUE
+ H5T_NATIVE_HADDR
+ H5T_NATIVE_HSIZE
+ H5T_NATIVE_HSSIZE
+ H5T_NATIVE_HERR
+ H5T_NATIVE_HBOOL
+</pre>
+ </tr></td>
+ </table>
+
+
+<h4>ANSI C9x-specific native integer datatypes</h4>
+ <ul>
+ <li>Signed integer (2's complement), unsigned integer, and bitfield
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ <li><code>LEAST</code> -- storage to use least amount of space
+ <br>
+ <code>FAST</code> -- storage to maximize performance
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=50% align=left>
+<pre>
+ H5T_NATIVE_INT8
+ H5T_NATIVE_UINT8
+ H5T_NATIVE_INT_LEAST8
+ H5T_NATIVE_UINT_LEAST8
+ H5T_NATIVE_INT_FAST8
+ H5T_NATIVE_UINT_FAST8
+
+ H5T_NATIVE_INT16
+ H5T_NATIVE_UINT16
+ H5T_NATIVE_INT_LEAST16
+ H5T_NATIVE_UINT_LEAST16
+ H5T_NATIVE_INT_FAST16
+ H5T_NATIVE_UINT_FAST16
+</pre>
+ </td>
+ <td valign=top width=50% align=left>
+<pre>
+ H5T_NATIVE_INT32
+ H5T_NATIVE_UINT32
+ H5T_NATIVE_INT_LEAST32
+ H5T_NATIVE_UINT_LEAST32
+ H5T_NATIVE_INT_FAST32
+ H5T_NATIVE_UINT_FAST32
+
+ H5T_NATIVE_INT64
+ H5T_NATIVE_UINT64
+ H5T_NATIVE_INT_LEAST64
+ H5T_NATIVE_UINT_LEAST64
+ H5T_NATIVE_INT_FAST64
+ H5T_NATIVE_UINT_FAST64
+</pre>
+ </tr></td>
+ </table>
+
+
+<h4>FORTRAN90 API datatypes</h4>
+ <ul>
+ <li>Datatypes defined for the FORTRAN90 APIs
+ <br>
+ <br>
+ <li>Native integer, single-precision real, double-precision real,
+ and character
+ </ul>
+
+<pre>
+ H5T_NATIVE_INTEGER
+ H5T_NATIVE_REAL
+ H5T_NATIVE_DOUBLE
+ H5T_NATIVE_CHARACTER
+</pre>
+
+ <ul>
+ <li>Signed integer (2's complement), unsigned integer, and
+ IEEE floating point
+ <li>8-bit, 16-bit, 32-bit, and 64-bit
+ <li>Big-endian and little-endian
+ </ul>
+
+ <table border=0 width=76%>
+ <tr><td valign=top width=33% align=left>
+<pre>
+ H5T_STD_I8BE
+ H5T_STD_I8LE
+ H5T_STD_I16BE
+ H5T_STD_I16LE
+ H5T_STD_I32BE
+ H5T_STD_I32LE
+ H5T_STD_I64BE
+ H5T_STD_I64LE
+</pre>
+ </td>
+ <td valign=top width=34% align=left>
+<pre>
+ H5T_STD_U8BE
+ H5T_STD_U8LE
+ H5T_STD_U16BE
+ H5T_STD_U16LE
+ H5T_STD_U32BE
+ H5T_STD_U32LE
+ H5T_STD_U64BE
+ H5T_STD_U64LE
+</pre>
+ </td>
+ <td valign=top width=33% align=left>
+<pre>
+ H5T_IEEE_F32BE
+ H5T_IEEE_F32LE
+ H5T_IEEE_F64BE
+ H5T_IEEE_F64LE
+</pre>
+ </tr></td>
+ </table>
+
+
+ <ul>
+ <li>Object reference or dataset region reference
+ </ul>
+
+<pre>
+ H5T_STD_REF_OBJ
+ H5T_STD_REF_DSETREG
+</pre>
+
+
+
+
+
+
+<hr>
+<center>
+<table border=0 width=98%>
+<tr><td valign=top align=left>
+<a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
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+<!--
+<a href="Glossary.html">Glossary</a><br>
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+<address>
+<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
+
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+Last modified: 12 December 2000
+<br>
+Describes HDF5 Release 1.4 Beta, December 2000
+
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