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59 lines
1.5 KiB
TypeScript
59 lines
1.5 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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export const enum Constants {
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/**
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* MAX SMI (SMall Integer) as defined in v8.
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* one bit is lost for boxing/unboxing flag.
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* one bit is lost for sign flag.
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* See https://thibaultlaurens.github.io/javascript/2013/04/29/how-the-v8-engine-works/#tagged-values
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*/
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MAX_SAFE_SMALL_INTEGER = 1 << 30,
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/**
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* MIN SMI (SMall Integer) as defined in v8.
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* one bit is lost for boxing/unboxing flag.
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* one bit is lost for sign flag.
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* See https://thibaultlaurens.github.io/javascript/2013/04/29/how-the-v8-engine-works/#tagged-values
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*/
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MIN_SAFE_SMALL_INTEGER = -(1 << 30),
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/**
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* Max unsigned integer that fits on 8 bits.
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*/
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MAX_UINT_8 = 255, // 2^8 - 1
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/**
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* Max unsigned integer that fits on 16 bits.
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*/
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MAX_UINT_16 = 65535, // 2^16 - 1
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/**
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* Max unsigned integer that fits on 32 bits.
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*/
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MAX_UINT_32 = 4294967295, // 2^32 - 1
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UNICODE_SUPPLEMENTARY_PLANE_BEGIN = 0x010000
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}
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export function toUint8(v: number): number {
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if (v < 0) {
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return 0;
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}
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if (v > Constants.MAX_UINT_8) {
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return Constants.MAX_UINT_8;
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}
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return v | 0;
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}
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export function toUint32(v: number): number {
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if (v < 0) {
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return 0;
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}
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if (v > Constants.MAX_UINT_32) {
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return Constants.MAX_UINT_32;
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}
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return v | 0;
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}
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