In memory, one value of the N-Bit datatype in the above example will be stored on a little-endian machine as follows:
Note: S - sign bit, P - significant bit, ? - padding bit; For signed integer, the sign bit is included in the precision.
When data of the above datatype is stored on disk using the N-bit filter, all padding bits are chopped off and only significant bits are stored. The values on disk will be something like:
The N-Bit filter is used effectively for compressing data of an N-Bit datatype as well as a compound and an array datatype with N-Bit fields. However, the datatype classes of the N-Bit datatype or the N-Bit field of the compound datatype or the array datatype are limited to integer or floating-point.
The N-Bit filter supports complex situations where a compound datatype contains member(s) of a compound datatype or an array datatype that has a compound datatype as the base type. However, it does not support the situation where an array datatype has a variable-length or variable-length string as its base datatype. The filter does support the situation where a variable-length or variable-length string is a member of a compound datatype.
The N-Bit filter allows all other HDF5 datatypes (such as time, string, bitfield, opaque, reference, enum, and variable length) to pass through as a no-op.
Like other I/O filters supported by the HDF5 library, application using the N-Bit filter must store data with chunked storage.
By nature, the N-Bit filter should not be used together with other I/O filters.
Returns a non-negative value if successful; otherwise returns a negative value.
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