feat(archive): add tar.bz2 converter via 7za

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/converters/archive.js

@@ -5,6 +5,7 @@ import os from 'node:os';
 import AdmZip from 'adm-zip';
 import { ZipArchive } from 'archiver';
 import * as tar from 'tar';
+import _7z from '7zip-min';
 import { register } from './registry.js';
 
 const MAX_EXTRACTED_BYTES = 2 * 1024 * 1024 * 1024;
@@ -70,8 +71,45 @@ async function createTarGz(srcDir, outputPath, quality) {
   await tar.create({ file: outputPath, cwd: srcDir, gzip: { level: quality ?? 6 } }, entries);
 }
 
-const EXTRACTORS = { zip: extractZip, tar: extractTarLike, 'tar.gz': extractTarLike };
-const CREATORS = { zip: createZip, tar: createTar, 'tar.gz': createTarGz };
+function bzip2Level(quality) {
+  return Math.max(1, quality ?? 9);
+}
+
+async function extractTarBz2(inputPath, destDir) {
+  const decompressDir = await fs.mkdtemp(path.join(os.tmpdir(), 'archive-bz2-'));
+  try {
+    await _7z.unpack(inputPath, decompressDir);
+    const [tarName] = await fs.readdir(decompressDir);
+    await tar.extract({ file: path.join(decompressDir, tarName), cwd: destDir });
+  } finally {
+    await fs.rm(decompressDir, { recursive: true, force: true });
+  }
+}
+
+async function createTarBz2(srcDir, outputPath, quality) {
+  const buildDir = await fs.mkdtemp(path.join(os.tmpdir(), 'archive-bz2-'));
+  try {
+    const tarPath = path.join(buildDir, 'archive.tar');
+    const entries = await fs.readdir(srcDir);
+    await tar.create({ file: tarPath, cwd: srcDir }, entries);
+    await _7z.cmd(['a', '-tbzip2', `-mx=${bzip2Level(quality)}`, outputPath, tarPath]);
+  } finally {
+    await fs.rm(buildDir, { recursive: true, force: true });
+  }
+}
+
+const EXTRACTORS = {
+  zip: extractZip,
+  tar: extractTarLike,
+  'tar.gz': extractTarLike,
+  'tar.bz2': extractTarBz2,
+};
+const CREATORS = {
+  zip: createZip,
+  tar: createTar,
+  'tar.gz': createTarGz,
+  'tar.bz2': createTarBz2,
+};
 
 async function convert(inputPath, outputPath, options, sourceFormat, targetFormat) {
   const { quality } = options ?? {};