1  /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <stdint.h>
      19  
      20  /* Lookup in a table of int32_t, with default value 0.  */
      21  int32_t
      22  __collidx_table_lookup (const char *table, uint32_t wc)
      23  {
      24    uint32_t shift1 = ((const uint32_t *) table)[0];
      25    uint32_t index1 = wc >> shift1;
      26    uint32_t bound = ((const uint32_t *) table)[1];
      27    if (index1 < bound)
      28      {
      29        uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
      30        if (lookup1 != 0)
      31  	{
      32  	  uint32_t shift2 = ((const uint32_t *) table)[2];
      33  	  uint32_t mask2 = ((const uint32_t *) table)[3];
      34  	  uint32_t index2 = (wc >> shift2) & mask2;
      35  	  uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
      36  	  if (lookup2 != 0)
      37  	    {
      38  	      uint32_t mask3 = ((const uint32_t *) table)[4];
      39  	      uint32_t index3 = wc & mask3;
      40  	      int32_t lookup3 = ((const int32_t *)(table + lookup2))[index3];
      41  
      42  	      return lookup3;
      43  	    }
      44  	}
      45      }
      46    return 0;
      47  }
      48  
      49  
      50  /* Lookup in a table of uint32_t, with default value 0xffffffff.  */
      51  uint32_t
      52  __collseq_table_lookup (const char *table, uint32_t wc)
      53  {
      54    uint32_t shift1 = ((const uint32_t *) table)[0];
      55    uint32_t index1 = wc >> shift1;
      56    uint32_t bound = ((const uint32_t *) table)[1];
      57    if (index1 < bound)
      58      {
      59        uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
      60        if (lookup1 != 0)
      61  	{
      62  	  uint32_t shift2 = ((const uint32_t *) table)[2];
      63  	  uint32_t mask2 = ((const uint32_t *) table)[3];
      64  	  uint32_t index2 = (wc >> shift2) & mask2;
      65  	  uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
      66  	  if (lookup2 != 0)
      67  	    {
      68  	      uint32_t mask3 = ((const uint32_t *) table)[4];
      69  	      uint32_t index3 = wc & mask3;
      70  	      uint32_t lookup3 = ((const uint32_t *)(table + lookup2))[index3];
      71  
      72  	      return lookup3;
      73  	    }
      74  	}
      75      }
      76    return ~((uint32_t) 0);
      77  }