mothra: never snarf the "Go:" box

[plan9front.git] / sys / src / cmd / file.c

diff --git a/sys/src/cmd/file.c b/sys/src/cmd/file.c
index 2759cce8df922a375ba7ea25ce32a73a09ffcb7e..7da5abdaaf6540421d8d2c185eac40e181fb79b0 100644 (file)
--- a/sys/src/cmd/file.c
+++ b/sys/src/cmd/file.c
@@ -150,6 +150,7 @@ int ishtml(void);
 int    isrfc822(void);
 int    ismbox(void);
 int    islimbo(void);
+int    ismp3(void);
 int    ismung(void);
 int    isp9bit(void);
 int    isp9font(void);
@@ -195,6 +196,7 @@ int (*call[])(void) =
        ismsdos,        /* msdos exe (virus file attachement) */
        isicocur,               /* windows icon or cursor file */
        isface,         /* ascii face file */
+       ismp3,
 
        /* last resorts */
        ismung,         /* entropy compressed/encrypted */
@@ -1135,6 +1137,23 @@ isas(void)
        return 1;
 }
 
+int
+ismp3(void)
+{
+       uchar *p, *e;
+
+       p = buf;
+       e = p + nbuf-1;
+       while((p < e) && (p = memchr(p, 0xFF, e - p))){
+               if((p[1] & 0xFE) == 0xFA){
+                       print(mime ? "audio/mpeg\n" : "mp3 audio\n");
+                       return 1;
+               }
+               p++;
+       }
+       return 0;
+}
+
 /*
  * low entropy means encrypted
  */