forked from akai/readest
Huang Xin
33 lines
762 B
TypeScript
33 lines
762 B
TypeScript
import { md5 } from 'js-md5';
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export function isMd5(value: string): boolean {
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return /^[0-9a-f]{32}$/.test(value);
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}
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export function md5Fingerprint(value: string): string {
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return md5(value).slice(0, 7);
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}
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export async function partialMD5(file: File): Promise<string> {
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const step = 1024;
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const size = 1024;
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const hasher = md5.create();
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for (let i = -1; i <= 10; i++) {
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const start = Math.min(file.size, step << (2 * i));
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const end = Math.min(start + size, file.size);
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if (start >= file.size) break;
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const blobSlice = file.slice(start, end);
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const arrayBuffer = await blobSlice.arrayBuffer();
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const uint8Array = new Uint8Array(arrayBuffer);
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hasher.update(uint8Array);
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}
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return hasher.hex();
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}
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export { md5 };
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