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ai_8.c

unsigned char     encode_8[]= {
      0x23, 0x25, 0x26, 0x27, 0x29, 0x2b, 0x2c, 0x3f,
      0x2f, 0x32, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
      0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x41, 0x42, 0x43,
      0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4b, 0x4c,
      0x4e, 0x4f, 0x52, 0x54, 0x55, 0x56, 0x57, 0x58,
      0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x61, 0x62,
      0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
      0x6b, 0x6c, 0x6d, 0x6e, 0x70, 0x71, 0x72, 0x73,
      0x74, 0x75, 0x76, 0x78, 0x79, 0x7a, 0x7c, 0xa1,
      0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9,
      0xaa, 0xab, 0xac, 0xae, 0xaf, 0xb0, 0xb1, 0xb2,
      0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb,
      0xbc, 0xbd, 0xbe, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4,
      0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc,
      0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd4, 0xd5, 0xd6,
      0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde
};

unsigned char     fstchar_8[]= {
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0x00, 0xff, 0x01, 0x02, 0x03,
      0xff, 0x04, 0xff, 0x05, 0x06, 0xff, 0xff, 0x08,
      0xff, 0xff, 0x09, 0xff, 0x0a, 0x0b, 0x0c, 0x0d,
      0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x07,
      0xff, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
      0x1c, 0x1d, 0xff, 0x1e, 0x1f, 0xff, 0x20, 0x21,
      0xff, 0xff, 0x22, 0xff, 0x23, 0x24, 0x25, 0x26,
      0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0xff,
      0xff, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34,
      0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0xff,
      0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0xff,
      0x43, 0x44, 0x45, 0xff, 0x46, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d,
      0x4e, 0x4f, 0x50, 0x51, 0x52, 0xff, 0x53, 0x54,
      0x55, 0x56, 0x57, 0xff, 0x58, 0x59, 0x5a, 0x5b,
      0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0xff,
      0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
      0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0xff, 0x70, 0x71,
      0x72, 0x73, 0x74, 0xff, 0x75, 0x76, 0x77, 0x78,
      0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

encline_8( str, ptr, len )
unsigned char     *str, *ptr;
unsigned int      len;
{
      unsigned int      i;
      for( len+= (int)ptr, ptr--, i= 0 ; (int)ptr < len ; i++ ){
            unsigned int      code, bit;
            switch( bit= i&7 ){
            case 0:
                  code= *++ptr;
                  break;
            default:
                  code = *ptr >> (8-bit);
                  code|= *++ptr << bit;
                  break;
            case 7:
                  code= *ptr >> 1;
            }
            *str++= encode_8[code&0x7f];
      }
      *str= '\0';
}

decline_8( buf, ptr, len )
unsigned char     *buf, *ptr;
unsigned int      len;
{
      unsigned int      i;
      unsigned char     *str= buf-1;
      for( i= 0 ; i< len ; i++ ){
            unsigned int      code, bit;
            if( (code= fstchar_8[*ptr++]) != 0xff ){
                  switch( bit= i&7 ){
                  case 0:
                        *++str= code;
                        break;
                  default:
                        *str++ |= code<<(8-bit);
                        *str    = code>>bit;
                        break;
                  case 7:
                        *str |= code<<1;
                  }
            }else
                  return      0;
      }
      return      str-buf;
}

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