41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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function parseBigIntChunked(str: string, base: number, chunkSize: number, powerOfChunkSize: bigint): bigint {
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const chunks = [];
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while (str.length > 0) {
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chunks.unshift(str.slice(-chunkSize));
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str = str.slice(0, -chunkSize);
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}
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let result = 0n;
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for (const chunk of chunks) {
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result *= powerOfChunkSize;
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const int = parseInt(chunk, base);
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if (Number.isNaN(int)) {
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throw new Error('Invalid base36 string');
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}
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result += BigInt(int);
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}
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return result;
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}
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export function parseBigInt36(str: string): bigint {
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// log_36(Number.MAX_SAFE_INTEGER) => 10.251599391715352
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// so we process 10 chars at once
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return parseBigIntChunked(str, 36, 10, 36n ** 10n);
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}
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export function parseBigInt16(str: string): bigint {
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// log_16(Number.MAX_SAFE_INTEGER) => 13.25
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// so we process 13 chars at once
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return parseBigIntChunked(str, 16, 13, 16n ** 13n);
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}
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export function parseBigInt32(str: string): bigint {
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// log_32(Number.MAX_SAFE_INTEGER) => 10.6
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// so we process 10 chars at once
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return parseBigIntChunked(str, 32, 10, 32n ** 10n);
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}
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