@aws-amplify/storage
Version:
Storage category of aws-amplify
56 lines (54 loc) • 2.08 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.calculateContentCRC32 = void 0;
const tslib_1 = require("tslib");
const crc_32_1 = tslib_1.__importDefault(require("crc-32"));
const hexUtils_1 = require("./hexUtils");
const readFile_1 = require("./readFile");
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 = crc_32_1.default.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 (0, readFile_1.readFile)(chunk);
const uint8Array = new Uint8Array(arrayBuffer);
internalSeed = crc_32_1.default.buf(uint8Array, internalSeed) >>> 0;
offset = end;
}
}
const hex = internalSeed.toString(16).padStart(8, '0');
return (0, hexUtils_1.hexToBase64)(hex);
};
exports.calculateContentCRC32 = calculateContentCRC32;
//# sourceMappingURL=crc32.js.map