MACROMEDIA COLFUSION MX 7-CFML Reference page 500

BitMaskRead
Description
Performs a bitwise mask read operation.
Returns
An integer, created from length bits of number, beginning at start.
Category
Mathematical functions
Function syntax
BitMaskRead(number, start, length)
See also
BitMaskClear,
Parameters
Parameter
number
start
length
Usage
Bit functions operate on 32-bit signed integers, in the range -2147483648 – 2147483647.
Example
<h3>BitMaskRead Example</h3>
<p>Returns integer created from <em>length</em> bits of <em>number</em>,
beginning
with <em>start</em>.
<p>BitMaskRead(255, 4, 4): <cfoutput>#BitMaskRead(255, 4, 4)#
</cfoutput>
<p>BitMaskRead(255, 0, 4): <cfoutput>#BitMaskRead(255, 0, 4)#
</cfoutput>
<p>BitMaskRead(128, 0, 7): <cfoutput>#BitMaskRead(128, 0, 7)#
</cfoutput>
500 Chapter 3: ColdFusion Functions
BitMaskSet
Description
32-bit signed integer to mask
Integer, in the range 0-31, inclusive; start bit for read
Integer, in the range 0-31, inclusive; length of mask