feat(archive): Add bzip3 support

Author: sorairolake

README.md

@@ -157,6 +157,7 @@ assert_eq!(kind.extension(), "foo");
 - **rar** - `application/vnd.rar`
 - **gz** - `application/gzip`
 - **bz2** - `application/x-bzip2`
+- **bz3** - `application/vnd.bzip3`
 - **7z** - `application/x-7z-compressed`
 - **xz** - `application/x-xz`
 - **pdf** - `application/pdf`

src/map.rs

@@ -462,6 +462,12 @@ matcher_map!(
         "bz2",
         matchers::archive::is_bz2
     ),
+    (
+        MatcherType::Archive,
+        "application/vnd.bzip3",
+        "bz3",
+        matchers::archive::is_bz3
+    ),
     (
         MatcherType::Archive,
         "application/x-7z-compressed",

src/matchers/archive.rs

@@ -52,11 +52,21 @@ pub fn is_gz(buf: &[u8]) -> bool {
     buf.len() > 2 && buf[0] == 0x1F && buf[1] == 0x8B && buf[2] == 0x8
 }
 
-/// Returns whether a buffer is a bzip archive.
+/// Returns whether a buffer is a bzip2 archive.
 pub fn is_bz2(buf: &[u8]) -> bool {
     buf.len() > 2 && buf[0] == 0x42 && buf[1] == 0x5A && buf[2] == 0x68
 }
 
+/// Returns whether a buffer is a bzip3 archive.
+pub fn is_bz3(buf: &[u8]) -> bool {
+    buf.len() > 4
+        && buf[0] == b'B'
+        && buf[1] == b'Z'
+        && buf[2] == b'3'
+        && buf[3] == b'v'
+        && buf[4] == b'1'
+}
+
 /// Returns whether a buffer is a 7z archive.
 pub fn is_7z(buf: &[u8]) -> bool {
     buf.len() > 5

testdata/sample.tar.bz3

@@ -1,5 +1,12 @@
 mod common;
 
+test_format!(
+    Archive,
+    "application/vnd.bzip3",
+    "bz3",
+    bz3,
+    "sample.tar.bz3"
+);
 test_format!(
     Archive,
     "application/vnd.sqlite3",