Header:
2			CARD16		MAJOR_VERSION	1	
2			CARD16		MINOR_VERSION	0	
4			CARD32		ALIAS_LIST_OFFSET
4			CARD32		PARENT_LIST_OFFSET
4			CARD32		LITERAL_LIST_OFFSET
4			CARD32		SUFFIX_LIST_OFFSET
4			CARD32		GLOB_LIST_OFFSET
4			CARD32		MAGIC_LIST_OFFSET
4			CARD32		NAMESPACE_LIST_OFFSET

AliasList:
4			CARD32		N_ALIASES
8*N_ALIASES		AliasListEntry

AliasListEntry:
4			CARD32		ALIAS_OFFSET
4			CARD32		MIME_TYPE_OFFSET

ParentList:
4			CARD32		N_ENTRIES 
8*N_ENTRIES		ParentListEntry

ParentListEntry:
4			CARD32		MIME_TYPE_OFFSET
4			CARD32		PARENTS_OFFSET

Parents:
4			CARD32		N_PARENTS
4*N_PARENTS		CARD32		MIME_TYPE_OFFSET

LiteralList:
4			CARD32		N_LITERALS
8*N_LITERALS		LiteralEntry	

LiteralEntry:
4			CARD32		LITERAL_OFFSET
4			CARD32		MIME_TYPE_OFFSET

GlobList:
4			CARD32		N_GLOBS
8*N_GLOBS		GlobEntry	

GlobEntry:
4			CARD32		GLOB_OFFSET
4			CARD32		MIME_TYPE_OFFSET

SuffixTree:
4			CARD32		N_ROOTS
4	 		CARD32		FIRST_ROOT_OFFSET

SuffixTreeNode:
4			CARD32		CHARACTER
4			CARD32		MIME_TYPE_OFFSET
4			CARD32		N_CHILDREN			
4			CARD32		FIRST_CHILD_OFFSET

MagicList:
4			CARD32		N_MATCHES
4			CARD32		MAX_EXTENT
4			CARD32		FIRST_MATCH_OFFSET

Match:
4			CARD32		PRIORITY
4			CARD32		MIME_TYPE_OFFSET
4			CARD32		N_MATCHLETS
4			CARD32		FIRST_MATCHLET_OFFSET

Matchlet:
4			CARD32		RANGE_START
4			CARD32		RANGE_LENGTH
4			CARD32		WORD_SIZE
4			CARD32		VALUE_LENGTH
4			CARD32		VALUE
4			CARD32		MASK
4			CARD32		N_CHILDREN
4			CARD32		FIRST_CHILD_OFFSET

NamespaceList:
4			CARD32		N_NAMESPACES
12*N_NAMESPACES		NamespaceEntry	

NamespaceEntry:
4			CARD32		NAMESPACE_URI_OFFSET
4			CARD32		LOCAL_NAME_OFFSET
4			CARD32		MIME_TYPE_OFFSET

Notes:

* The list of aliases is sorted by alias, the list of 
  literal globs is sorted by the literal. The SuffixTreeNode
  siblings are sorted by character. The list of namespaces
  is sorted by namespace uri.

* All offsets are in bytes from he beginning of the file

* Strings are zero-terminated

* All numbers are in network (big-endian) order. This is
  necessary because the data will be stored in arch-independent
  directories like /usr/share/mime or even in user's 
  home directories.

* Cache files have to be written atomically - write to a
  temporary name, then move over the old file - so that
  clients that have the old cache file open and mmap'ed
  won't get corrupt data.