feat(archive): add 7z and tar.7z converters

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

src/converters/archive.js

@@ -98,17 +98,56 @@ async function createTarBz2(srcDir, outputPath, quality) {
   }
 }
 
+function sevenZipLevel(quality) {
+  return quality ?? 5;
+}
+
+async function extract7z(inputPath, destDir) {
+  await _7z.unpack(inputPath, destDir);
+}
+
+async function create7z(srcDir, outputPath, quality) {
+  await _7z.cmd(['a', '-r', `-mx=${sevenZipLevel(quality)}`, outputPath, path.join(srcDir, '*')]);
+}
+
+async function extractTar7z(inputPath, destDir) {
+  const decompressDir = await fs.mkdtemp(path.join(os.tmpdir(), 'archive-7z-'));
+  try {
+    await _7z.unpack(inputPath, decompressDir);
+    const [tarName] = await fs.readdir(decompressDir);
+    await tar.extract({ file: path.join(decompressDir, tarName), cwd: destDir });
+  } finally {
+    await fs.rm(decompressDir, { recursive: true, force: true });
+  }
+}
+
+async function createTar7z(srcDir, outputPath, quality) {
+  const buildDir = await fs.mkdtemp(path.join(os.tmpdir(), 'archive-7z-'));
+  try {
+    const tarPath = path.join(buildDir, 'archive.tar');
+    const entries = await fs.readdir(srcDir);
+    await tar.create({ file: tarPath, cwd: srcDir }, entries);
+    await _7z.cmd(['a', `-mx=${sevenZipLevel(quality)}`, outputPath, tarPath]);
+  } finally {
+    await fs.rm(buildDir, { recursive: true, force: true });
+  }
+}
+
 const EXTRACTORS = {
   zip: extractZip,
   tar: extractTarLike,
   'tar.gz': extractTarLike,
   'tar.bz2': extractTarBz2,
+  '7z': extract7z,
+  'tar.7z': extractTar7z,
 };
 const CREATORS = {
   zip: createZip,
   tar: createTar,
   'tar.gz': createTarGz,
   'tar.bz2': createTarBz2,
+  '7z': create7z,
+  'tar.7z': createTar7z,
 };
 
 async function convert(inputPath, outputPath, options, sourceFormat, targetFormat) {