redis-smq-common
Version:
Provides essential components and utilities shared across RedisSMQ packages.
99 lines • 4.92 kB
JavaScript
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.extractRpm = extractRpm;
const fs_1 = __importDefault(require("fs"));
const node_child_process_1 = require("node:child_process");
const node_util_1 = require("node:util");
const execAsync = (0, node_util_1.promisify)(node_child_process_1.exec);
function readChunkFromFile(filePath_1, offset_1) {
return __awaiter(this, arguments, void 0, function* (filePath, offset, blockSize = 1, blockCount = 1) {
var _a, e_1, _b, _c;
const stream = fs_1.default.createReadStream(filePath, {
start: offset,
end: offset + blockSize * blockCount - 1,
});
const buffers = [];
let data;
try {
for (var _d = true, stream_1 = __asyncValues(stream), stream_1_1; stream_1_1 = yield stream_1.next(), _a = stream_1_1.done, !_a; _d = true) {
_c = stream_1_1.value;
_d = false;
data = _c;
buffers.push(data);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_d && !_a && (_b = stream_1.return)) yield _b.call(stream_1);
}
finally { if (e_1) throw e_1.error; }
}
return Buffer.concat(buffers);
});
}
function calculateRpmHeaderSize(filePath, headerOffset) {
return __awaiter(this, void 0, void 0, function* () {
const magic = (yield readChunkFromFile(filePath, headerOffset, 3, 1)).toString('hex');
if (magic !== '8eade8') {
throw new Error(`File doesn't look like rpm`);
}
let offset = headerOffset + 8;
const bytes = Array.from(yield readChunkFromFile(filePath, offset, 8, 1));
const size = 8 +
((bytes[0] << 24) + (bytes[1] << 16) + (bytes[2] << 8) + bytes[3]) * 16 +
(bytes[4] << 24) +
(bytes[5] << 16) +
(bytes[6] << 8) +
bytes[7];
offset += size;
return { size, offset };
});
}
function getPayloadDecompressionCommand(payloadMagic) {
const decompressCommands = {
'425a': 'bunzip2',
'1f8b': 'gunzip',
fd37: 'xzcat',
'5d00': 'unlzma',
'28b5': 'unzstd',
};
const command = decompressCommands[payloadMagic];
if (!command) {
throw new Error(`Unrecognized payload compression format: ${payloadMagic}`);
}
return command;
}
function extractRpm(filePath, destinationDirectory) {
return __awaiter(this, void 0, void 0, function* () {
const rpmMagic = (yield readChunkFromFile(filePath, 0, 4, 1)).toString('hex');
if (rpmMagic !== 'edabeedb') {
throw new Error(`File doesn't look like rpm: ${filePath}`);
}
const { size, offset } = yield calculateRpmHeaderSize(filePath, 96);
const { offset: payloadOffset } = yield calculateRpmHeaderSize(filePath, offset + ((8 - (size % 8)) % 8));
const payloadMagic = (yield readChunkFromFile(filePath, payloadOffset, 2, 1)).toString('hex');
const decompressCommand = getPayloadDecompressionCommand(payloadMagic);
yield execAsync(`dd if="${filePath}" skip="${payloadOffset}" iflag=skip_bytes status=none | ${decompressCommand} | cpio -idmv`, { cwd: destinationDirectory });
});
}
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