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(PDF of complete manual formatted as print volume)

HDF5 Predefined Datatypes

The following datatypes are predefined in HDF5.

IEEE floating point datatypes

32-bit and 64-bit
Big-endian and little-endian

        H5T_IEEE_F32BE
        H5T_IEEE_F32LE
        H5T_IEEE_F64BE
        H5T_IEEE_F64LE

Standard datatypes

Signed integer (2's complement), unsigned integer, and bitfield
8-bit, 16-bit, 32-bit, and 64-bit
Big-endian and little-endian

        H5T_STD_I8BE
        H5T_STD_I8LE
        H5T_STD_I16BE
        H5T_STD_I16LE
        H5T_STD_I32BE
        H5T_STD_I32LE
        H5T_STD_I64BE
        H5T_STD_I64LE

        H5T_STD_U8BE 
        H5T_STD_U8LE
        H5T_STD_U16BE
        H5T_STD_U16LE
        H5T_STD_U32BE
        H5T_STD_U32LE
        H5T_STD_U64BE 
        H5T_STD_U64LE

        H5T_STD_B8BE
        H5T_STD_B8LE
        H5T_STD_B16BE 
        H5T_STD_B16LE
        H5T_STD_B32BE
        H5T_STD_B32LE
        H5T_STD_B64BE 
        H5T_STD_B64LE

Object reference or dataset region reference

        H5T_STD_REF_OBJ
        H5T_STD_REF_DSETREG

UNIX-specific datatypes

32-bit and 64-bit
Big-endian and little-endian

        H5T_UNIX_D32BE
        H5T_UNIX_D32LE
        H5T_UNIX_D64BE
        H5T_UNIX_D64LE

C-specific datatype

String datatype in C (size defined in bytes rather than in bits)

        H5T_C_S1

FORTRAN-specific datatype

String datatype in FORTRAN (as defined for the HDF5 C library)

        H5T_FORTRAN_S1

Intel-specific datatypes

For Intel CPUs
Little-endian
Signed integer (2's complement), unsigned integer, bitfield, and IEEE floating point
8-bit, 16-bit, 32-bit, and 64-bit

        H5T_INTEL_I8
        H5T_INTEL_I16
        H5T_INTEL_I32
        H5T_INTEL_I64

        H5T_INTEL_U8
        H5T_INTEL_U16
        H5T_INTEL_U32
        H5T_INTEL_U64

        H5T_INTEL_B8
        H5T_INTEL_B16
        H5T_INTEL_B32
        H5T_INTEL_B64

        H5T_INTEL_F32
        H5T_INTEL_F64

DEC Alpha-specific datatypes

For DEC Alpha CPUs
Little-endian
Signed integer (2's complement), unsigned integer, bitfield, and IEEE floating point
8-bit, 16-bit, 32-bit, and 64-bit

        H5T_ALPHA_I8
        H5T_ALPHA_I16
        H5T_ALPHA_I32
        H5T_ALPHA_I64

        H5T_ALPHA_U8
        H5T_ALPHA_U16
        H5T_ALPHA_U32
        H5T_ALPHA_U64

        H5T_ALPHA_B8
        H5T_ALPHA_B16
        H5T_ALPHA_B32
        H5T_ALPHA_B64

        H5T_ALPHA_F32
        H5T_ALPHA_F64

MIPS-specific datatypes

For MIPS CPUs, commonly used in SGI system
Big-endian
Signed integer (2's complement), unsigned integer, bitfield, and IEEE floating point
8-bit, 16-bit, 32-bit, and 64-bit

        H5T_MIPS_I8
        H5T_MIPS_I16
        H5T_MIPS_I32
        H5T_MIPS_I64

        H5T_MIPS_U8
        H5T_MIPS_U16
        H5T_MIPS_U32
        H5T_MIPS_U64

        H5T_MIPS_B8
        H5T_MIPS_B16
        H5T_MIPS_B32
        H5T_MIPS_B64

        H5T_MIPS_F32
        H5T_MIPS_F64

Predefined native datatypes

These are the datatypes detected by H5detect. Their names differ from other HDF5 datatype names as follows:

Instead of a class name, precision, and byte order as the last component, they have a C-like datatype name.
If the datatype begins with U, then it is the unsigned version of the integer datatype; other integer datatypes are signed.
The datatype LLONG corresponds to C's long_long and LDOUBLE is long_double. These datatypes might be the same as LONG and DOUBLE, respectively.

        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

        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

ANSI C9x-specific native integer datatypes

Signed integer (2's complement), unsigned integer, and bitfield
8-bit, 16-bit, 32-bit, and 64-bit
LEAST -- storage to use least amount of space
FAST -- storage to maximize performance

        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

        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

FORTRAN90 API datatypes

Datatypes defined for the FORTRAN90 APIs
Native integer, single-precision real, double-precision real, and character

        H5T_NATIVE_INTEGER
        H5T_NATIVE_REAL
        H5T_NATIVE_DOUBLE
        H5T_NATIVE_CHARACTER

Signed integer (2's complement), unsigned integer, and IEEE floating point
8-bit, 16-bit, 32-bit, and 64-bit
Big-endian and little-endian

        H5T_STD_I8BE
        H5T_STD_I8LE
        H5T_STD_I16BE
        H5T_STD_I16LE
        H5T_STD_I32BE
        H5T_STD_I32LE
        H5T_STD_I64BE
        H5T_STD_I64LE

        H5T_STD_U8BE
        H5T_STD_U8LE
        H5T_STD_U16BE
        H5T_STD_U16LE
        H5T_STD_U32BE
        H5T_STD_U32LE
        H5T_STD_U64BE
        H5T_STD_U64LE

        H5T_IEEE_F32BE
        H5T_IEEE_F32LE
        H5T_IEEE_F64BE
        H5T_IEEE_F64LE

Object reference or dataset region reference

        H5T_STD_REF_OBJ
        H5T_STD_REF_DSETREG

HDF5 documents and links Introduction to HDF5 HDF5 User Guide	And in this document, the HDF5 Reference Manual H5 H5A H5D H5E H5F H5G H5I H5P H5R H5S H5T H5Z Tools Datatypes Collective Calls in Parallel
(PDF of complete manual formatted as print volume)

The HDF Group Help Desk:

Describes HDF5 Release 1.6.10, November 2009