file(1) and marshal(1) assign vCards a MIME type of text/x-vcard.
This patch changes them to use the IANA assigned type 'text/directory'.

Note that with this patch, "file -m vcard-file" will print the string

	text/directory;profile=vcard

I.e. it includes the recommended 'profile' parameter. This
could potentially break existing code that naïvely parses
the output by assuming everything after the '/' is the
subtype. But considering how this output is typically used it
shouldn't be an issue.

Reference: /n/sources/patch/applied/mime-vcard
Date: Tue Jan 18 21:47:31 CET 2011
Signed-off-by: lyndon@orthanc.ca

--- /sys/lib/mimetype	Tue Jan 18 21:31:10 2011
+++ /sys/lib/mimetype	Tue Jan 18 21:31:08 2011
@@ -146,7 +146,7 @@
 .txt		text		plain		-		y
 .ucert		application	x-x509-user-cert	-	y # DER X.509 user certificate
 .ustar		application	x-ustar		-		m
-.vcf		text		x-vcard		-		y # vCard
+.vcf		text		directory		-		y # vCard
 .wav		audio		x-wav		-		y
 .wbmp		image		vnd.wap.wbmp	-		y # wireless bitmap
 .wml		text		vnd.wap.wml	-		m # WML doc
--- /sys/src/cmd/file.c	Tue Jan 18 21:31:15 2011
+++ /sys/src/cmd/file.c	Tue Jan 18 21:31:12 2011
@@ -339,7 +339,7 @@
 		return;
 	}
 	if(mbuf->type != 'M' && mbuf->type != '|') {
-		print(mime ? OCTET : "special file #%C/%s\n",
+		print(mime ? OCTET : "special file #%c/%s\n",
 			mbuf->type, mbuf->name);
 		return;
 	}
@@ -586,7 +586,6 @@
 	/* "pXc2 */
 	0x32630070,	0xFFFF00FF,	"pac4 audio file\n",	OCTET,
 	0xBA010000,	0xFFFFFFFF,	"mpeg system stream\n",	OCTET,
-	0x43614c66,	0xFFFFFFFF,	"FLAC audio file\n",	OCTET,
 	0x30800CC0,	0xFFFFFFFF,	"inferno .dis executable\n", OCTET,
 	0x04034B50,	0xFFFFFFFF,	"zip archive\n", "application/zip",
 	070707,		0xFFFF,		"cpio archive\n", OCTET,
@@ -596,16 +595,6 @@
 	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",
-	/* 0xfeedface: this could alternately be a Next Plan 9 boot image */
-	0xcefaedfe,	0xFFFFFFFF,	"32-bit power Mach-O executable\n", OCTET,
-	/* 0xfeedfacf */
-	0xcffaedfe,	0xFFFFFFFF,	"64-bit power Mach-O executable\n", OCTET,
-	/* 0xcefaedfe */
-	0xfeedface,	0xFFFFFFFF,	"386 Mach-O executable\n", OCTET,
-	/* 0xcffaedfe */
-	0xfeedfacf,	0xFFFFFFFF,	"amd64 Mach-O executable\n", OCTET,
-	/* 0xcafebabe */
-	0xbebafeca,	0xFFFFFFFF,	"Mach-O universal executable\n", OCTET,
 	/*
 	 * venti & fossil magic numbers are stored big-endian on disk,
 	 * thus the numbers appear reversed in this table.
@@ -825,6 +814,8 @@
 				"pem x.509 certificate", -1,	"text/plain",
 	"subject=/C=",		"pem certificate with header", -1, "text/plain",
 	"process snapshot ",	"process snapshot",	-1,	"application/snapfs",
+	"BEGIN:VCARD\r\n",	"vCard",		13,	"text/directory;profile=vcard",
+	"BEGIN:VCARD\n",	"vCard",		12,	"text/directory;profile=vcard",
 	0,0,0,0
 };