/* Copyright (C) 2015 Red Hat, Inc.

   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   elfutils is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <inttypes.h>

#include <libelf.h>

#include <gelf.h>

#include <stdbool.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

int

main (int argc, char *argv[])

{

  int result = 0;

  int cnt;

  if (argc < 3

      || (strcmp (argv[1], "read") != 0

          && strcmp (argv[1], "mmap") != 0))

    {

      printf ("Usage: (read|mmap) files...\n");

      return -1;

    }

  bool mmap = strcmp (argv[1], "mmap") == 0;

  elf_version (EV_CURRENT);

  for (cnt = 2; cnt < argc; ++cnt)

    {

      int fd = open (argv[cnt], O_RDONLY);

      Elf *elf = elf_begin (fd, mmap ? ELF_C_READ_MMAP : ELF_C_READ, NULL);

      if (elf == NULL)

	{

	  printf ("%s not usable %s\n", argv[cnt], elf_errmsg (-1));

	  result = 1;

	  close (fd);

	  continue;

	}

      /* To get the section names.  */

      size_t strndx;

      elf_getshdrstrndx (elf, &strndx);

      Elf_Scn *scn = NULL;

      while ((scn = elf_nextscn (elf, scn)) != NULL)

	{

	  size_t idx = elf_ndxscn (scn);

	  GElf_Shdr mem;

	  GElf_Shdr *shdr = gelf_getshdr (scn, &mem;;

	  const char *name = elf_strptr (elf, strndx, shdr->sh_name);

	  if ((shdr->sh_flags & SHF_COMPRESSED) != 0)

	    {

	      /* Real compressed section.  */

	      if (elf_compress (scn, 0, 0) < 0)

		{

		  printf ("elf_compress failed for section %zd: %s\n",

			  idx, elf_errmsg (-1));

		  return -1;

		}

	      Elf_Data *d = elf_getdata (scn, NULL);

	      printf ("%zd: %s, ELF compressed, size: %zx\n",

		      idx, name, d->d_size);

	    }

	  else

	    {

	      /* Maybe an old GNU compressed .z section?  */

	      if (name[0] == '.' && name[1] == 'z')

		{

		  if (elf_compress_gnu (scn, 0, 0) < 0)

		    {

		      printf ("elf_compress_gnu failed for section %zd: %s\n",

			      idx, elf_errmsg (-1));

		      return -1;

		    }

		  Elf_Data *d = elf_getdata (scn, NULL);

		  printf ("%zd: %s, GNU compressed, size: %zx\n",

			  idx, name, d->d_size);

		}

	      else

		printf ("%zd: %s, NOT compressed\n", idx, name);

	    }

	}

      elf_end (elf);

      close (fd);

    }

  return result;

}