@aws-amplify/storage/dist/esm/providers/s3/utils/getCombinedCrc32.native.mjs

Storage category of aws-amplify

import { getDataChunker } from '../apis/internal/uploadData/multipart/getDataChunker.mjs';
import { calculateContentCRC32 } from './crc32.mjs';

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
/**
 * Calculates a combined CRC32 checksum for the given data.
 *
 * This function chunks the input data, calculates CRC32 for each chunk,
 * and then combines these checksums into a single value.
 *
 * @async
 * @param {StorageUploadDataPayload} data - The data to calculate the checksum for.
 * @param {number | undefined} size - The size of each chunk. If undefined, a default chunk size will be used.
 * @returns {Promise<string>} A promise that resolves to a string containing the combined CRC32 checksum
 *                            and the number of chunks, separated by a hyphen.
 */
const getCombinedCrc32 = async (data, size) => {
    const crc32List = [];
    const dataChunker = getDataChunker(data, size);
    let totalLength = 0;
    for (const { data: checkData } of dataChunker) {
        const checksum = new Uint8Array((await calculateContentCRC32(checkData)).checksumArrayBuffer);
        totalLength += checksum.length;
        crc32List.push(checksum);
    }
    // Combine all Uint8Arrays into a single Uint8Array
    const combinedArray = new Uint8Array(totalLength);
    let offset = 0;
    for (const crc32Hash of crc32List) {
        combinedArray.set(crc32Hash, offset);
        offset += crc32Hash.length;
    }
    return `${(await calculateContentCRC32(combinedArray.buffer)).checksum}-${crc32List.length}`;
};

export { getCombinedCrc32 };
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