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