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