Catche error 99 and returns original buffer (#33)

fix #32
imagemin · Jan 25, 2017 · b889812 · b889812
1 parent 6c3631e
commit b889812
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diff --git a/fixture-no-compress.png b/fixture-no-compress.png
diff --git a/index.js b/index.js
@@ -52,6 +52,9 @@ module.exports = opts => buf => {
 		bin: pngquant,
 		args
 	}).catch(err => {
+		if (err.code === 99) {
+			return buf;
+		}
 		err.message = err.stderr || err.message;
 		throw err;
 	});

diff --git a/test.js b/test.js
@@ -37,3 +37,10 @@ test('throw on corrupt image', async t => {
 	const buf = await fsP.readFile(path.join(__dirname, 'fixture-corrupt.png'));
 	t.throws(m()(buf), /PNG file corrupted/);
 });
+
+test('skip optimizing a fully optimized PNG', async t => {
+	const buf = await fsP.readFile(path.join(__dirname, 'fixture-no-compress.png'));
+	const data = await m({quality: 100})(buf);
+	t.is(data.length, buf.length);
+	t.true(isPng(data));
+});