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file: recognize .ico and .cur files

--- a/sys/src/cmd/file.c

+++ b/sys/src/cmd/file.c

@@ -155,6 +155,7 @@

 int	isp9font(void);

 int	isrtf(void);

 int	ismsdos(void);

+int	isicocur(void);

 int	iself(void);

 int	istring(void);

 int	isoffstr(void);

@@ -192,6 +193,7 @@

 	isp9bit,	/* plan 9 image (as from /dev/window) */

 	isrtf,		/* rich text format */

 	ismsdos,	/* msdos exe (virus file attachement) */

+	isicocur,		/* windows icon or cursor file */

 	isface,		/* ascii face file */

 	/* last resorts */

@@ -871,7 +873,7 @@

 	ulong	off;

 	struct FILE_STRING;

 } offstrs[] = {

-	32*1024, "\001CD001\001",	"ISO9660 CD image",	7,	OCTET,

+	32*1024, "\001CD001\001",	"ISO9660 CD image",	7,	"application/x-iso9660-image",

 	0, 0, 0, 0, 0

 };

@@ -1451,6 +1453,24 @@

 {

 	if (buf[0] == 0x4d && buf[1] == 0x5a){

 		print(mime ? "application/x-msdownload\n" : "MSDOS executable\n");

+		return 1;

+	}

+	return 0;

+}

+

+int

+isicocur(void)

+{

+	if(buf[0] || buf[1] || buf[3] || buf[9])

+		return 0;

+	if(buf[4] == 0x00 && buf[5] == 0x00)

+		return 0;

+	switch(buf[2]){

+	case 1:

+		print(mime ? "image/x-icon\n" : "Microsoft icon file\n");

+		return 1;

+	case 2:

+		print(mime ? "image/x-icon\n" : "Microsoft cursor file\n");

 		return 1;

 	}

 	return 0;

-- 

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