I am interested in extracting data from a legacy file format that utilizes IBM floating point numbers. These numbers were commonly used on the IBM System/360 mainframe computer system. Now, I am hoping to leverage this information within a JavaScript program.
What is the most efficient method for converting IBM floating point numbers into JavaScript-compatible values?
Here is a custom function that can take a buffer of little endian IBM floats and convert them into a numerical value:
function ibmToJavaScript(buffer) {
var sign = buffer[0] >> 7
var exponent = buffer[0] & 0x7f
var fraction = 0
function getBit(buffer, bit) {
return buffer[Math.floor(bit / 8)] >> (7 - (bit % 8)) & 1
}
for (var i = 0; i < 24; i++) {
fraction += getBit(buffer, 8 + i) / (2 << i)
}
return (1 - 2 * sign) * Math.pow(16.0, exponent - 64) * fraction
}
Please note that this implementation does not account for special cases like NaN or Infinity.
This code snippet was adapted from the source:
A minor adjustment to Hallgrim's solution that now includes support for double-precision floats:
function ibm2js(buffer) {
var sign = buffer[0] >> 7
var exponent = buffer[0] & 0x7f
var fraction = 0
function bit(buffer, bit) {
return buffer[Math.floor(bit / 8)] >> (7 - (bit % 8)) & 1
}
var denom = 1
var totalBit = (buffer.length - 1) * 8
for (var i = 0; i < totalBit; i++) {
denom = denom * 2
fraction += bit(buffer, 8 + i) / denom
}
return (1 - 2 * sign) * Math.pow(16.0, exponent - 64) * fraction
}
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