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       1                 :            : /* Conversion functions for versioning information.
       2                 :            :    Copyright (C) 2006, 2007 Red Hat, Inc.
       3                 :            :    Copyright (C) 2023, Mark J. Wielaard <mark@klomp.org>
       4                 :            :    This file is part of elfutils.
       5                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2006.
       6                 :            : 
       7                 :            :    This file is free software; you can redistribute it and/or modify
       8                 :            :    it under the terms of either
       9                 :            : 
      10                 :            :      * the GNU Lesser General Public License as published by the Free
      11                 :            :        Software Foundation; either version 3 of the License, or (at
      12                 :            :        your option) any later version
      13                 :            : 
      14                 :            :    or
      15                 :            : 
      16                 :            :      * the GNU General Public License as published by the Free
      17                 :            :        Software Foundation; either version 2 of the License, or (at
      18                 :            :        your option) any later version
      19                 :            : 
      20                 :            :    or both in parallel, as here.
      21                 :            : 
      22                 :            :    elfutils is distributed in the hope that it will be useful, but
      23                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      24                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      25                 :            :    General Public License for more details.
      26                 :            : 
      27                 :            :    You should have received copies of the GNU General Public License and
      28                 :            :    the GNU Lesser General Public License along with this program.  If
      29                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      30                 :            : 
      31                 :            : #include <assert.h>
      32                 :            : #include <gelf.h>
      33                 :            : 
      34                 :            : #include "libelfP.h"
      35                 :            : 
      36                 :            : 
      37                 :            : static void
      38                 :        130 : elf_cvt_gnuhash (void *dest, const void *src, size_t len, int encode)
      39                 :            : {
      40                 :        130 :   size_t size = len;
      41                 :            :   /* The GNU hash table format on 64 bit machines mixes 32 bit and 64 bit
      42                 :            :      words.  We must detangle them here.   */
      43                 :        130 :   Elf32_Word *dest32 = dest;
      44                 :        130 :   const Elf32_Word *src32 = src;
      45                 :            : 
      46                 :            :   /* First four control words, 32 bits.  */
      47         [ +  + ]:        650 :   for (unsigned int cnt = 0; cnt < 4; ++cnt)
      48                 :            :     {
      49         [ -  + ]:        520 :       if (len < 4)
      50                 :          0 :         goto done;
      51                 :        520 :       dest32[cnt] = bswap_32 (src32[cnt]);
      52                 :            :       len -= 4;
      53                 :            :     }
      54                 :            : 
      55         [ +  + ]:        130 :   Elf32_Word bitmask_words = encode ? src32[2] : dest32[2];
      56                 :            : 
      57                 :            :   /* Now the 64 bit words.  */
      58                 :        130 :   Elf64_Xword *dest64 = (Elf64_Xword *) &dest32[4];
      59                 :        130 :   const Elf64_Xword *src64 = (const Elf64_Xword *) &src32[4];
      60         [ +  + ]:        260 :   for (unsigned int cnt = 0; cnt < bitmask_words; ++cnt)
      61                 :            :     {
      62         [ -  + ]:        130 :       if (len < 8)
      63                 :          0 :         goto done;
      64                 :        130 :       dest64[cnt] = bswap_64 (src64[cnt]);
      65                 :        130 :       len -= 8;
      66                 :            :     }
      67                 :            : 
      68                 :            :   /* The rest are 32 bit words again.  */
      69                 :        130 :   src32 = (const Elf32_Word *) &src64[bitmask_words];
      70                 :        130 :   dest32 = (Elf32_Word *) &dest64[bitmask_words];
      71         [ +  + ]:        282 :   while (len >= 4)
      72                 :            :     {
      73                 :        152 :       *dest32++ = bswap_32 (*src32++);
      74                 :        152 :       len -= 4;
      75                 :            :     }
      76                 :            : 
      77                 :        130 :  done:
      78                 :            :   /* If there are any bytes left, we weren't able to convert the
      79                 :            :      partial structures, just copy them over. */
      80         [ -  + ]:        130 :   if (len > 0)
      81                 :          0 :     memmove (dest + size - len, src + size - len, len);
      82                 :        130 : }