CSR Bluecore DFU (firmware update) file format

src/binwalk/magic/firmware

@@ -80,6 +80,16 @@
 #From xp-dev.com
 0    string        BOOTLOADER!    Mediatek bootloader
 
+# CSR DFU Image, References:
+# Bluez dfutool
+# Andrea Bittau's CSR Tools http://darkircop.org/bt/
+0    string        CSR-dfu2       CSR (XAP2) DFU firmware update header
+>8   uleshort      >3             {invalid}  # version consistently observed
+
+0    string        CSRbcfw1       CSR Bluecore firmware segment
+>18  uleshort      !1             {invalid}  # version consistently observed
+
+
 #CSYS header formats
 0    string        CSYS\x00    CSYS header, little endian, 
 >8   lelong        x           size: %d