mem2liee()

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Description

Converts a 64 bit IEE double float at a certain position in a byte array into a C.O.F.F.E.E. float.

Definition

[float] mem2liee([bytes] mem,[int] pos,[int] byteorder)

Parameters

mem is a byte array.
pos is the position within mem.
byteorder is either big endian or little endian.

Return Value

mem2liee() converts 8 bytes from position pos in the byte array mem as a 64 bit IEE double float and returns the result as a float value. The byte ordering is decided by the value of the byteorder parameter:

Value Platform Byte ordering

GE_MOTOROLA Motorola big endian

GE_INTEL Intel little endian

An IEE double float consists of 1 sign bit (0 = positive and 1 = negative), 11 bits for the exponent (unsigned but biased with 1023) and 52 bits for the mantissa (a binary fraction with an implied leading 1).

Remember: The first element of a byte array is at position 0.

Example

// Outputs "18461.947266"

var mem = new(bytes,8);

mem[0]=0x40;
mem[1]=0xD2;
mem[2]=0x07;
mem[3]=0x7C;
mem[4]=0xA0;
mem[5]=0x00;
mem[6]=0x00;
mem[7]=0x00;

var motorola = mem2liee(mem,0,GE_MOTOROLA);
println(motorola);


// Outputs "18461.947266"

var mem = new(bytes,8);

mem[0]=0x00;
mem[1]=0x00;
mem[2]=0x00;
mem[3]=0xA0;
mem[4]=0x7C;
mem[5]=0x07;
mem[6]=0xD2;
mem[7]=0x40;

var intel = mem2liee(mem,0,GE_INTEL);
println(intel);