include/wine/unicode.h

   1 /*
   2  * Wine internal Unicode definitions
   3  *
   4  * Copyright 2000 Alexandre Julliard
   5  */
   6
   7 #ifndef __WINE_UNICODE_H
   8 #define __WINE_UNICODE_H
   9
  10 /* code page info common to SBCS and DBCS */
  11 struct cp_info
  12 {
  13     unsigned int          codepage;          /* codepage id */
  14     unsigned int          char_size;         /* char size (1 or 2 bytes) */
  15     unsigned short        def_char;          /* default char value (can be double-byte) */
  16     unsigned short        def_unicode_char;  /* default Unicode char value */
  17     const char           *name;              /* code page name */
  18 };
  19
  20 struct sbcs_table
  21 {
  22     struct cp_info        info;
  23     const unsigned short *cp2uni;            /* code page -> Unicode map */
  24     const unsigned char  *uni2cp_low;        /* Unicode -> code page map */
  25     const unsigned short *uni2cp_high;
  26 };
  27
  28 struct dbcs_table
  29 {
  30     struct cp_info        info;
  31     const unsigned short *cp2uni;            /* code page -> Unicode map */
  32     const unsigned char  *cp2uni_leadbytes;
  33     const unsigned short *uni2cp_low;        /* Unicode -> code page map */
  34     const unsigned short *uni2cp_high;
  35     unsigned char         lead_bytes[12];    /* lead bytes ranges */
  36 };
  37
  38 union cptable
  39 {
  40     struct cp_info    info;
  41     struct sbcs_table sbcs;
  42     struct dbcs_table dbcs;
  43 };
  44
  45 extern const union cptable *cp_get_table( unsigned int codepage );
  46 extern const union cptable *cp_enum_table( unsigned int index );
  47
  48 extern int cp_mbstowcs( const union cptable *table, int flags,
  49                         const char *src, int srclen,
  50                         unsigned short *dst, int dstlen );
  51 extern int cp_wcstombs( const union cptable *table, int flags,
  52                         const unsigned short *src, int srclen,
  53                         char *dst, int dstlen, const char *defchar, int *used );
  54
  55
  56 static inline int is_dbcs_leadbyte( const union cptable *table, unsigned char ch )
  57 {
  58     return (table->info.char_size == 2) && (table->dbcs.cp2uni_leadbytes[ch]);
  59 }
  60
  61 static inline unsigned int strlenW( const unsigned short *str )
  62 {
  63 #if defined(__i386__) && defined(__GNUC__)
  64     int dummy, res;
  65     __asm__( "cld\n\t"
  66              "repne\n\t"
  67              "scasw\n\t"
  68              "notl %0"
  69              : "=c" (res), "=&D" (dummy)
  70              : "0" (0xffffffff), "1" (str), "a" (0) );
  71     return res - 1;
  72 #else
  73     const unsigned short *s = str;
  74     while (*s) s++;
  75     return s - str;
  76 #endif
  77 }
  78
  79 #endif  /* __WINE_UNICODE_H */