@aws-amplify/storage/dist/esm/providers/s3/utils/crc32.mjs

Storage category of aws-amplify

import crc32 from 'crc-32';
import { hexToBase64 } from './hexUtils.mjs';
import { readFile } from './readFile.mjs';

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// TODO: Remove this file once the remove/delete API is migrated to the
// 3-layer architecture. It is kept only for `deleteObjects` which still
// relies on the old `readFile` runtime guard. New code should import
// `calculateContentCRC32` from `foundation/utils/crc32` instead.
const CHUNK_SIZE = 1024 * 1024; // 1MB chunks
/**
 * Calculate the CRC32 checksum for given content and return base64 encoded checksum.
 */
const calculateContentCRC32 = async (content, seed = 0) => {
    let internalSeed = seed;
    if (content instanceof ArrayBuffer || ArrayBuffer.isView(content)) {
        let uint8Array;
        if (content instanceof ArrayBuffer) {
            uint8Array = new Uint8Array(content);
        }
        else {
            uint8Array = new Uint8Array(content.buffer, content.byteOffset, content.byteLength);
        }
        let offset = 0;
        while (offset < uint8Array.length) {
            const end = Math.min(offset + CHUNK_SIZE, uint8Array.length);
            const chunk = uint8Array.slice(offset, end);
            internalSeed = crc32.buf(chunk, internalSeed) >>> 0;
            offset = end;
        }
    }
    else {
        let blob;
        if (content instanceof Blob) {
            blob = content;
        }
        else {
            blob = new Blob([content]);
        }
        let offset = 0;
        while (offset < blob.size) {
            const end = Math.min(offset + CHUNK_SIZE, blob.size);
            const chunk = blob.slice(offset, end);
            const arrayBuffer = await readFile(chunk);
            const uint8Array = new Uint8Array(arrayBuffer);
            internalSeed = crc32.buf(uint8Array, internalSeed) >>> 0;
            offset = end;
        }
    }
    const hex = internalSeed.toString(16).padStart(8, '0');
    return hexToBase64(hex);
};

export { calculateContentCRC32 };
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