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ieee754.js
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ieee754.js
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'use strict'
const decimalPrecision = require('./src/decimalPrecision');
const precisionDecimal = require('./src/precisionDecimal');
const validation = require('./src/validation');
const shared = require('./src/shared');
function createBinaryString(value, bits) {
let signed = value.length;
let binary = '';
let unsigned = bits / signed;
for (let i = 0; i < signed; i++) {
binary += shared.createUnsignedBinaryString(value[i], unsigned);
}
return binary;
}
function createInt(value, bits) {
let array = [];
for (let i = 0; i < (value.length / bits); i++) {
let binary = '';
for (let j = i * bits; j < ((i + 1) * bits); j++) {
binary += value[j];
}
array.push(parseInt(binary, 2));
}
return array;
}
function setDefaultBitsForPrecision(precision) {
if (precision === 'half') { return 16; }
if (precision === 'single') { return 32; }
if (precision === 'double') { return 64; }
return 16;
}
function setDefaultMantissaForPrecision(precision) {
if (precision === 'half') { return 10; }
if (precision === 'single') { return 23; }
if (precision === 'double') { return 52; }
return 10;
}
function precisionToType(precision, options) {
if (options && options.returnType === '16bitArray') {
return createInt(precision, 16);
}
else if (options && options.returnType === '8bitArray') {
return createInt(precision, 8);
}
else {
return precision;
}
}
exports.getDecimal = function getDecimal(value, options) {
try {
validation.validate('precisionDecimal', value, options);
const bits = setDefaultBitsForPrecision(options.mode);
const mantissa = setDefaultMantissaForPrecision(options.mode);
if (typeof value === 'object') {
value = createBinaryString(value, bits);
}
return precisionDecimal.precisionToDecimal(value, bits, mantissa);
}
catch(err) {
console.log(err);
}
};
exports.getPrecision = function getPrecision(value, options) {
try {
validation.validate('decimalPrecision', value, options);
const bits = setDefaultBitsForPrecision(options.mode);
const mantissa = setDefaultMantissaForPrecision(options.mode);
let precision = decimalPrecision.decimalToPrecision(value, bits, mantissa);
return precisionToType(precision, options);
}
catch(err) {
console.log(err);
}
};