@aws-amplify/storage
Version:
Storage category of aws-amplify
41 lines (39 loc) • 1.84 kB
JavaScript
;
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
Object.defineProperty(exports, "__esModule", { value: true });
exports.getCombinedCrc32 = void 0;
const getDataChunker_1 = require("../apis/internal/uploadData/multipart/getDataChunker");
const crc32_1 = require("./crc32");
/**
* 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 = (0, getDataChunker_1.getDataChunker)(data, size);
let totalLength = 0;
for (const { data: checkData } of dataChunker) {
const checksum = new Uint8Array((await (0, crc32_1.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 `${(await (0, crc32_1.calculateContentCRC32)(combinedArray.buffer)).checksum}-${crc32List.length}`;
};
exports.getCombinedCrc32 = getCombinedCrc32;
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