84 lines
2.5 KiB
JavaScript
84 lines
2.5 KiB
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
var callBound = require('call-bind/callBound');
|
|
|
|
var $RangeError = require('es-errors/range');
|
|
var $SyntaxError = require('es-errors/syntax');
|
|
var $TypeError = require('es-errors/type');
|
|
var $BigInt = GetIntrinsic('%BigInt%', true);
|
|
|
|
var hasOwnProperty = require('./HasOwnProperty');
|
|
var IsArray = require('./IsArray');
|
|
var IsBigIntElementType = require('./IsBigIntElementType');
|
|
var IsUnsignedElementType = require('./IsUnsignedElementType');
|
|
|
|
var bytesAsFloat32 = require('../helpers/bytesAsFloat32');
|
|
var bytesAsFloat64 = require('../helpers/bytesAsFloat64');
|
|
var bytesAsInteger = require('../helpers/bytesAsInteger');
|
|
var every = require('../helpers/every');
|
|
var isByteValue = require('../helpers/isByteValue');
|
|
|
|
var $reverse = callBound('Array.prototype.reverse');
|
|
var $slice = callBound('Array.prototype.slice');
|
|
|
|
var keys = require('object-keys');
|
|
|
|
// https://262.ecma-international.org/11.0/#table-the-typedarray-constructors
|
|
var TypeToSizes = {
|
|
__proto__: null,
|
|
Int8: 1,
|
|
Uint8: 1,
|
|
Uint8C: 1,
|
|
Int16: 2,
|
|
Uint16: 2,
|
|
Int32: 4,
|
|
Uint32: 4,
|
|
BigInt64: 8,
|
|
BigUint64: 8,
|
|
Float32: 4,
|
|
Float64: 8
|
|
};
|
|
|
|
// https://262.ecma-international.org/11.0/#sec-rawbytestonumeric
|
|
|
|
module.exports = function RawBytesToNumeric(type, rawBytes, isLittleEndian) {
|
|
if (!hasOwnProperty(TypeToSizes, type)) {
|
|
throw new $TypeError('Assertion failed: `type` must be a TypedArray element type: ' + keys(TypeToSizes));
|
|
}
|
|
if (!IsArray(rawBytes) || !every(rawBytes, isByteValue)) {
|
|
throw new $TypeError('Assertion failed: `rawBytes` must be an Array of bytes');
|
|
}
|
|
if (typeof isLittleEndian !== 'boolean') {
|
|
throw new $TypeError('Assertion failed: `isLittleEndian` must be a Boolean');
|
|
}
|
|
|
|
var elementSize = TypeToSizes[type]; // step 1
|
|
|
|
if (rawBytes.length !== elementSize) {
|
|
// this assertion is not in the spec, but it'd be an editorial error if it were ever violated
|
|
throw new $RangeError('Assertion failed: `rawBytes` must have a length of ' + elementSize + ' for type ' + type);
|
|
}
|
|
|
|
var isBigInt = IsBigIntElementType(type);
|
|
if (isBigInt && !$BigInt) {
|
|
throw new $SyntaxError('this environment does not support BigInts');
|
|
}
|
|
|
|
// eslint-disable-next-line no-param-reassign
|
|
rawBytes = $slice(rawBytes, 0, elementSize);
|
|
if (!isLittleEndian) {
|
|
$reverse(rawBytes); // step 2
|
|
}
|
|
|
|
if (type === 'Float32') { // step 3
|
|
return bytesAsFloat32(rawBytes);
|
|
}
|
|
|
|
if (type === 'Float64') { // step 4
|
|
return bytesAsFloat64(rawBytes);
|
|
}
|
|
|
|
return bytesAsInteger(rawBytes, elementSize, IsUnsignedElementType(type), isBigInt);
|
|
};
|