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72 lines
2.4 KiB
72 lines
2.4 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var callBound = require('call-bound'); |
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var $RangeError = require('es-errors/range'); |
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var $SyntaxError = require('es-errors/syntax'); |
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var $TypeError = require('es-errors/type'); |
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var $BigInt = GetIntrinsic('%BigInt%', true); |
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var hasOwnProperty = require('./HasOwnProperty'); |
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var IsArray = require('./IsArray'); |
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var IsBigIntElementType = require('./IsBigIntElementType'); |
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var IsUnsignedElementType = require('./IsUnsignedElementType'); |
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var bytesAsFloat16 = require('../helpers/bytesAsFloat16'); |
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var bytesAsFloat32 = require('../helpers/bytesAsFloat32'); |
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var bytesAsFloat64 = require('../helpers/bytesAsFloat64'); |
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var bytesAsInteger = require('../helpers/bytesAsInteger'); |
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var every = require('../helpers/every'); |
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var isByteValue = require('../helpers/isByteValue'); |
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var $reverse = callBound('Array.prototype.reverse'); |
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var $slice = callBound('Array.prototype.slice'); |
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var tableTAO = require('./tables/typed-array-objects'); |
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// https://262.ecma-international.org/15.0/#sec-rawbytestonumeric |
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module.exports = function RawBytesToNumeric(type, rawBytes, isLittleEndian) { |
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if (!hasOwnProperty(tableTAO.size, '$' + type)) { |
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throw new $TypeError('Assertion failed: `type` must be a TypedArray element type'); |
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} |
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if (!IsArray(rawBytes) || !every(rawBytes, isByteValue)) { |
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throw new $TypeError('Assertion failed: `rawBytes` must be an Array of bytes'); |
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} |
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if (typeof isLittleEndian !== 'boolean') { |
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throw new $TypeError('Assertion failed: `isLittleEndian` must be a Boolean'); |
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} |
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var elementSize = tableTAO.size['$' + type]; // step 1 |
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if (rawBytes.length !== elementSize) { |
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// this assertion is not in the spec, but it'd be an editorial error if it were ever violated |
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throw new $RangeError('Assertion failed: `rawBytes` must have a length of ' + elementSize + ' for type ' + type); |
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} |
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var isBigInt = IsBigIntElementType(type); |
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if (isBigInt && !$BigInt) { |
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throw new $SyntaxError('this environment does not support BigInts'); |
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} |
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// eslint-disable-next-line no-param-reassign |
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rawBytes = $slice(rawBytes, 0, elementSize); |
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if (!isLittleEndian) { |
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$reverse(rawBytes); // step 2 |
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} |
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if (type === 'FLOAT16') { // step 3 |
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return bytesAsFloat16(rawBytes); |
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} |
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if (type === 'FLOAT32') { // step 4 |
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return bytesAsFloat32(rawBytes); |
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} |
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if (type === 'FLOAT64') { // step 5 |
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return bytesAsFloat64(rawBytes); |
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} |
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return bytesAsInteger(rawBytes, elementSize, IsUnsignedElementType(type), isBigInt); |
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};
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