Index: tools/mkfat.py
===================================================================
--- tools/mkfat.py	(revision 25becee86ea7008be79f32a90a0f8d5be900d26e)
+++ tools/mkfat.py	(revision 25becee86ea7008be79f32a90a0f8d5be900d26e)
@@ -0,0 +1,109 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2008 Martin Decky
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+"""
+FAT creator
+"""
+
+import sys
+import os
+import random
+import xstruct
+
+BOOT_SECTOR = """little:
+	uint8_t jmp[3]             /* jump instruction */
+	char oem[8]                /* OEM string */
+	uint16_t sector            /* bytes per sector */
+	uint8_t cluster            /* sectors per cluster */
+	uint16_t reserved          /* reserved sectors */
+	uint8_t fats               /* number of FATs */
+	uint16_t rootdir           /* root directory entries */
+	uint16_t sectors           /* total number of sectors */
+	uint8_t descriptor         /* media descriptor */
+	uint16_t fat_sectors       /* sectors per single FAT */
+	uint16_t track_sectors     /* sectors per track */
+	uint16_t heads             /* number of heads */
+	uint32_t hidden            /* hidden sectors */
+	uint32_t sectors_big       /* total number of sectors (if sectors == 0) */
+	
+	/* Extended BIOS Parameter Block */
+	uint8_t drive              /* physical drive number */
+	padding[1]                 /* reserved (current head) */
+	uint8_t extboot_signature  /* extended boot signature */
+	uint32_t serial            /* serial number */
+	char label[11]             /* volume label */
+	char fstype[8]             /* filesystem type */
+	padding[448]               /* boot code */
+	uint8_t boot_signature[2]  /* boot signature */
+"""
+
+def usage(prname):
+	"Print usage syntax"
+	print prname + " <PATH> <IMAGE>"
+
+def main():
+	if (len(sys.argv) < 3):
+		usage(sys.argv[0])
+		return
+	
+	path = os.path.abspath(sys.argv[1])
+	if (not os.path.isdir(path)):
+		print "<PATH> must be a directory"
+		return
+	
+	outf = file(sys.argv[2], "w")
+	
+	boot_sector = xstruct.create(BOOT_SECTOR)
+	boot_sector.jmp = [0xEB, 0x3C, 0x90]
+	boot_sector.oem = "MSDOS5.0"
+	boot_sector.sector = 512
+	boot_sector.cluster = 8 # 4096 bytes per cluster
+	boot_sector.reserved = 1
+	boot_sector.fats = 2
+	boot_sector.rootdir = 224 # FIXME: root directory should be sector aligned
+	boot_sector.sectors = 0 # FIXME
+	boot_sector.descriptor = 0xF8
+	boot_sector.fat_sectors = 0 # FIXME
+	boot_sector.track_sectors = 0 # FIXME
+	boot_sector.heads = 0 # FIXME
+	boot_sector.hidden = 0
+	boot_sector.sectors_big = 0 # FIXME
+	
+	boot_sector.drive = 0
+	boot_sector.extboot_signature = 0x29
+	boot_sector.serial = random.randint(0, 0xFFFFFFFF)
+	boot_sector.label = "HELENOS"
+	boot_sector.fstype = "FAT16   "
+	boot_sector.boot_signature = [0x55, 0xAA]
+	
+	outf.write(boot_sector.pack())
+	
+	outf.close()
+	
+if __name__ == '__main__':
+	main()
Index: tools/xstruct.py
===================================================================
--- tools/xstruct.py	(revision 8f2a85212b7dfe84452d1ed0d1ed23e4d49fa7c1)
+++ tools/xstruct.py	(revision 25becee86ea7008be79f32a90a0f8d5be900d26e)
@@ -37,9 +37,13 @@
 	
 	def pack(self):
-		list = []
-		for variable in self._list_:
-			list.append(self.__dict__[variable])
+		args = []
+		for variable in self._args_:
+			if (isinstance(self.__dict__[variable], list)):
+				for item in self.__dict__[variable]:
+					args.append(item)
+			else:
+				args.append(self.__dict__[variable])
 		
-		return struct.pack(self._format_, *list)
+		return struct.pack(self._format_, *args)
 
 def create(definition):
@@ -55,5 +59,5 @@
 	}[tokens[0]]()
 	inst = Struct()
-	list = []
+	args = []
 	
 	# Member tags
@@ -79,5 +83,5 @@
 			
 			inst.__dict__[subtokens[0]] = None
-			list.append(subtokens[0])
+			args.append(subtokens[0])
 			
 			variable = None
@@ -103,4 +107,4 @@
 	
 	inst.__dict__['_format_'] = format
-	inst.__dict__['_list_'] = list
+	inst.__dict__['_args_'] = args
 	return inst