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+/*****************************************************************
+** encoding.h
+**
+** Copyright 1998 Clark Cooper
+** All rights reserved.
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the same terms as Perl itself.
+*/
+
+#ifndef ENCODING_H
+#define ENCODING_H 1
+
+#define ENCMAP_MAGIC	0xfeebface
+
+typedef struct prefixmap {
+  unsigned char	min;
+  unsigned char len;			/* 0 => 256 */
+  unsigned short bmap_start;
+  unsigned char ispfx[32];
+  unsigned char ischar[32];
+} PrefixMap;
+
+typedef struct encinf
+{
+  unsigned short	prefixes_size;
+  unsigned short	bytemap_size;
+  int			firstmap[256];
+  PrefixMap		*prefixes;
+  unsigned short	*bytemap;
+} Encinfo;
+
+typedef struct encmaphdr
+{
+  unsigned int		magic;
+  char			name[40];
+  unsigned short	pfsize;
+  unsigned short	bmsize;
+  int			map[256];
+} Encmap_Header;
+
+/*================================================================
+** Structure of Encoding map binary encoding
+**
+** Note that all shorts and ints are in network order,
+** so when packing or unpacking with perl, use 'n' and 'N' respectively.
+** In C, use the htonl family of functions.
+**
+** The basic structure is:
+**
+**	_______________________
+**	|Header (including map expat needs for 1st byte)
+**	|PrefixMap * pfsize
+**	|   This section isn't included for single-byte encodings.
+**	|   For multiple byte encodings, when a byte represents a prefix
+**	|   then it indexes into this vector instead of mapping to a
+**	|   Unicode character. The PrefixMap type is declared above. The
+**	|   ispfx and ischar fields are bitvectors indicating whether
+**	|   the byte being mapped is a prefix or character respectively.
+**	|   If neither is set, then the character is not mapped to Unicode.
+**	|
+**	|   The min field is the 1st byte mapped for this prefix; the
+**	|   len field is the number of bytes mapped; and bmap_start is
+**	|   the starting index of the map for this prefix in the overall
+**	|   map (next section).
+**	|unsigned short * bmsize
+**	|   This section also is omitted for single-byte encodings.
+**	|   Each short is either a Unicode scalar or an index into the
+**	|   PrefixMap vector.
+**
+** The header for these files is declared above as the Encmap_Header type.
+** The magic field is a magic number which should match the ENCMAP_MAGIC
+** macro above. The next 40 bytes stores IANA registered name for the
+** encoding. The pfsize field holds the number of PrefixMaps, which should
+** be zero for single byte encodings. The bmsize field holds the number of
+** shorts used for the overall map.
+**
+** The map field contains either the Unicode scalar encoded by the 1st byte
+** or -n where n is the number of bytes that such a 1st byte implies (Expat
+** requires that the number of bytes to encode a character is indicated by
+** the 1st byte) or -1 if the byte doesn't map to any Unicode character.
+**
+** If the encoding is a multiple byte encoding, then there will be PrefixMap
+** and character map sections. The 1st PrefixMap (index 0), covers a range
+** of bytes that includes all 1st byte prefixes.
+**
+** Look at convert_to_unicode in Expat.xs to see how this data structure
+** is used.
+*/
+
+#endif  /* ndef ENCODING_H */