for the benefit of email clients, add a few character sets
and change the mime type of a directory to "text/directory".

Notes:
Wed Dec 14 17:26:02 EST 2011 geoff
    The first change is a bad idea (directories aren't text),
    and the second is redundant: the tables are already in file.


Reference: /n/sources/patch/sorry/fileemail
Date: Wed Dec  7 16:35:50 CET 2011
Signed-off-by: quanstro@quanstro.net
Reviewed-by: geoff

--- /sys/src/cmd/file.c	Wed Dec  7 16:35:47 2011
+++ /sys/src/cmd/file.c	Wed Dec  7 16:35:46 2011
@@ -335,7 +335,7 @@
 		return;
 	}
 	if(mbuf->mode & DMDIR) {
-		print(mime ? OCTET : "directory\n");
+		print(mime ? "text/directory\n" : "directory\n");
 		return;
 	}
 	if(mbuf->type != 'M' && mbuf->type != '|') {
@@ -606,6 +606,10 @@
 	0xfeedfacf,	0xFFFFFFFF,	"amd64 Mach-O executable\n", OCTET,
 	/* 0xcafebabe */
 	0xbebafeca,	0xFFFFFFFF,	"Mach-O universal executable\n", OCTET,
+	0xfeff0000,	0xffffffff,	"utf-32be\n",	"text/plain; charset=utf-32be",
+	0xfffe,		0xffffffff,	"utf-32le\n",	"text/plain; charset=utf-32le",
+	0xfeff,		0xffff,		"utf-16be\n",	"text/plain; charset=utf-16be",
+	0xfffe,		0xffff,		"utf-16le\n",	"text/plain; charset=utf-16le",
 	/*
 	 * venti & fossil magic numbers are stored big-endian on disk,
 	 * thus the numbers appear reversed in this table.