72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var hasOwnProperty = require('./HasOwnProperty');
|
|
var ToInt16 = require('./ToInt16');
|
|
var ToInt32 = require('./ToInt32');
|
|
var ToInt8 = require('./ToInt8');
|
|
var ToUint16 = require('./ToUint16');
|
|
var ToUint32 = require('./ToUint32');
|
|
var ToUint8 = require('./ToUint8');
|
|
var ToUint8Clamp = require('./ToUint8Clamp');
|
|
|
|
var valueToFloat32Bytes = require('../helpers/valueToFloat32Bytes');
|
|
var valueToFloat64Bytes = require('../helpers/valueToFloat64Bytes');
|
|
var integerToNBytes = require('../helpers/integerToNBytes');
|
|
|
|
var keys = require('object-keys');
|
|
|
|
// https://262.ecma-international.org/8.0/#table-50
|
|
var TypeToSizes = {
|
|
__proto__: null,
|
|
Int8: 1,
|
|
Uint8: 1,
|
|
Uint8C: 1,
|
|
Int16: 2,
|
|
Uint16: 2,
|
|
Int32: 4,
|
|
Uint32: 4,
|
|
Float32: 4,
|
|
Float64: 8
|
|
};
|
|
|
|
var TypeToAO = {
|
|
__proto__: null,
|
|
Int8: ToInt8,
|
|
Uint8: ToUint8,
|
|
Uint8C: ToUint8Clamp,
|
|
Int16: ToInt16,
|
|
Uint16: ToUint16,
|
|
Int32: ToInt32,
|
|
Uint32: ToUint32
|
|
};
|
|
|
|
// https://262.ecma-international.org/8.0/#sec-numbertorawbytes
|
|
|
|
module.exports = function NumberToRawBytes(type, value, isLittleEndian) {
|
|
if (typeof type !== 'string' || !hasOwnProperty(TypeToSizes, type)) {
|
|
throw new $TypeError('Assertion failed: `type` must be a TypedArray element type: ' + keys(TypeToSizes));
|
|
}
|
|
if (typeof value !== 'number') {
|
|
throw new $TypeError('Assertion failed: `value` must be a Number');
|
|
}
|
|
if (typeof isLittleEndian !== 'boolean') {
|
|
throw new $TypeError('Assertion failed: `isLittleEndian` must be a Boolean');
|
|
}
|
|
|
|
if (type === 'Float32') { // step 1
|
|
return valueToFloat32Bytes(value, isLittleEndian);
|
|
} else if (type === 'Float64') { // step 2
|
|
return valueToFloat64Bytes(value, isLittleEndian);
|
|
} // step 3
|
|
|
|
var n = TypeToSizes[type]; // step 3.a
|
|
|
|
var convOp = TypeToAO[type]; // step 3.b
|
|
|
|
var intValue = convOp(value); // step 3.c
|
|
|
|
return integerToNBytes(intValue, n, isLittleEndian); // step 3.d, 3.e, 4
|
|
};
|