ByteSize ( bytes ; precision )

Converts bytes to a magnitude-appropriate unit of measure

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Jeremy Bante

https://github.com/jbante/

Sample input:

ByteSize ( 618288209196180 ; 2 )

Sample output:

562.33 TB

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/**
 * =====================================
 * ByteSize ( bytes ; precision )
 *
 * RETURNS:
 *		The same quantity of bytes expressed in a unit of appropriate magnitude.
 *
 * PARAMETERS:
 *		bytes: The number of bytes.
 *		precision: The precision for the final result, treated the same as the
 *		Round function.
 *
 * DEPENDENCIES: none
 *
 * NOTES:
 *		SI (metric) and binary units for *bytes are different for different orders of
 *		magnitude. This function was designed with the assumption that a given solution
 *		will only use one or the other, which can be controlled by setting the ~isMetric
 *		Let variable in the function. If both are needed in the same file, make separate
 *		copies of this function, one for each system of units.
 *
 * HISTORY:
 *		CREATED on 2012-06-01 by Jeremy Bante <http://scr.im/jbante>.
 *
 * REFERENCES:
 *		http://en.wikipedia.org/wiki/Byte
 * =====================================
 */

Let ( [
	~isMetric = False;

	~ratio = If ( ~isMetric ; 1000 ; /* Else */ 1024 );
	~magnitude = Floor ( Ln ( bytes ) / Ln ( ~ratio ) );
	~magnitude = Min ( ~magnitude ; 8 )	// don't exceed known magnitude units
];
	Round ( bytes / ~ratio ^ ~magnitude ; precision )	// convert magnitude
	& Choose ( ~magnitude;	// postfix for magnitude appropriate unit
		" B";	// byte
		" kB";	// kilo
		" MB";	// mega
		" GB";	// giga
		" TB";	// tera
		" PB";	// peta
		" EB";	// exa
		" ZB";	// zetta
		" YB"	// yotta
	)
)

Converts bytes to a magnitude-appropriate unit of measure.

Comments

		belg4mit Aug 22, 2022
To change 0 YB to 0 B for bytes=0, change the second magnitude line to: ~magnitude = Min ( Max(~magnitude ;0); 8 ) // don't exceed known magnitude units, and catch 0 bytes

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

ByteSize ( bytes ; precision )

Comments

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