forked from akai/readest
chrox
23 lines
563 B
TypeScript
23 lines
563 B
TypeScript
import { md5 } from 'js-md5';
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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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