Merge pull request #101 from Obirvalger/master

Add support for qcow2 qemu disks

README.md

@@ -218,6 +218,7 @@ assert_eq!(kind.extension(), "foo");
 - **dey** - `application/vnd.android.dey`
 - **der** - `application/x-x509-ca-cert`
 - **obj** - `application/x-executable`
+- **qcow2** - `application/x-qemu-disk`
 
 ## Known Issues
 

src/map.rs

@@ -105,6 +105,12 @@ matcher_map!(
         "pem",
         matchers::app::is_pem
     ),
+    (
+        MatcherType::App,
+        "application/x-qemu-disk",
+        "qcow2",
+        matchers::app::is_qcow2
+    ),
     // Book
     (
         MatcherType::Book,

src/matchers/app.rs

@@ -157,3 +157,9 @@ pub fn is_pem(buf: &[u8]) -> bool {
         && buf[9] == b'N'
         && buf[10] == b' '
 }
+
+/// Returns whether a buffer is a QCOW2 disk.
+pub fn is_qcow2(buf: &[u8]) -> bool {
+    // https://github.com/qemu/qemu/blob/master/docs/interop/qcow2.txt
+    buf.len() > 4 && buf[0] == b'Q' && buf[1] == b'F' && buf[2] == b'I' && buf[3] == 0xFB
+}

tests/app.rs

@@ -49,3 +49,11 @@ test_format!(App, "application/wasm", "wasm", wasm, "sample.wasm");
 test_format!(App, "application/x-x509-ca-cert", "der", der, "sample.der");
 
 test_format!(App, "application/x-x509-ca-cert", "pem", pem, "sample.pem");
+
+test_format!(
+    App,
+    "application/x-qemu-disk",
+    "qcow2",
+    qcow2,
+    "sample.qcow2"
+);