kc3-lang/libpng/contrib/mips-msa/linux.c

Branch - branch -libpng16libpng17

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• Hash : d7d950e8
  Author :
  Date : 2024-10-10T14:09:02
  

  [libpng16] chore: Clean up the leading blank lines from all source files
  
  The leading blank lines are apparently an artefact of an older source
  control system.  They are not required and they look like accidents,
  because starting a source file with a blank line is not a regular habit
  of software developers nowadays.
  
  This is a cherry-pick of commit 37cc20add8fb5b83bb5299a26cd3b41e0f776017
  from branch 'libpng18'.
  
  Signed-off-by: John Bowler <jbowler@acm.org>
  Signed-off-by: Cosmin Truta <ctruta@gmail.com>
  

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• contrib/mips-msa/linux.c

• /* contrib/mips-msa/linux.c
   *
   * Copyright (c) 2020-2023 Cosmin Truta
   * Copyright (c) 2016 Glenn Randers-Pehrson
   * Written by Mandar Sahastrabuddhe, 2016.
   * Updated by Sui Jingfeng, 2021.
   *
   * This code is released under the libpng license.
   * For conditions of distribution and use, see the disclaimer
   * and license in png.h
   *
   * On Linux, png_have_msa is implemented by reading the pseudo-file
   * "/proc/self/auxv".
   *
   * See contrib/mips-msa/README before reporting bugs.
   *
   * STATUS: SUPPORTED
   * BUG REPORTS: png-mng-implement@sourceforge.net
   */
  
  #include <elf.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  static int
  png_have_msa(png_structp png_ptr)
  {
     Elf64_auxv_t aux;
     int fd;
     int has_msa = 0;
  
     fd = open("/proc/self/auxv", O_RDONLY);
     if (fd >= 0)
     {
        while (read(fd, &aux, sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t))
        {
           if (aux.a_type == AT_HWCAP)
           {
              uint64_t hwcap = aux.a_un.a_val;
  
              has_msa = (hwcap >> 1) & 1;
              break;
           }
        }
        close(fd);
     }
  #ifdef PNG_WARNINGS_SUPPORTED
     else
        png_warning(png_ptr, "/proc/self/auxv open failed");
  #endif
  
     return has_msa;
  }
  

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