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Converting Little Endian Byte Array To Long

Posted on 2003-11-22
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Last Modified: 2007-12-19
Greetings!

I would like to know how to convert a Little Endian byte array to a long value. I already have a code for Big Endian to Long:

For i = LBound(ByteArray) To UBound(ByteArray)
        Return = ShiftLeft(Return, 8) + ByteArray(i)
Next i

ShiftLeft is a function which shifts a value n bits to the left (SHL ; <<).

For Little Endian to Long, I am currently using a loop, which will "mirror" an array and then pass it to the Big Endian to Long function, but that is slow - especially when there are lots of items.
I thought there might be some built in functions or APIs which could accelerate the whole process.

Sebastian Mares
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Question by:Sebastian_Mares
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2 Comments
 
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Z_Beeblebrox earned 30 total points
ID: 9810605
Hi,

Since little endian is the format used by Intel (x86) you can use the CopyMemory API to do the conversion directly.

Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)

CopyMemory Return, ByteArray(0), 4

Zaphod.
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